/*
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* Copyright 2002-2009 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.walker.infrastructure.utils;
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import java.lang.reflect.Array;
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import java.util.Arrays;
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/**
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* Miscellaneous object utility methods.
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*
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* <p>Mainly for internal use within the framework; consider
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* <a href="http://jakarta.apache.org/commons/lang/">Jakarta's Commons Lang</a>
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* for a more comprehensive suite of object utilities.
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*
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* <p>Thanks to Alex Ruiz for contributing several enhancements to this class!
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*
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* @author Juergen Hoeller
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* @author Keith Donald
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* @author Rod Johnson
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* @author Rob Harrop
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* @since 19.03.2004
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// * @see org.apache.commons.lang.ObjectUtils
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*/
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public abstract class ObjectUtils {
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private static final int INITIAL_HASH = 7;
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private static final int MULTIPLIER = 31;
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private static final String EMPTY_STRING = "";
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private static final String NULL_STRING = "null";
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private static final String ARRAY_START = "{";
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private static final String ARRAY_END = "}";
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private static final String EMPTY_ARRAY = ARRAY_START + ARRAY_END;
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private static final String ARRAY_ELEMENT_SEPARATOR = ", ";
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/**
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* Return whether the given throwable is a checked exception:
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* that is, neither a RuntimeException nor an Error.
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* @param ex the throwable to check
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* @return whether the throwable is a checked exception
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* @see Exception
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* @see RuntimeException
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* @see Error
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*/
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public static boolean isCheckedException(Throwable ex) {
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return !(ex instanceof RuntimeException || ex instanceof Error);
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}
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/**
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* Check whether the given exception is compatible with the exceptions
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* declared in a throws clause.
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* @param ex the exception to checked
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* @param declaredExceptions the exceptions declared in the throws clause
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* @return whether the given exception is compatible
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*/
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public static boolean isCompatibleWithThrowsClause(Throwable ex, Class<?>[] declaredExceptions) {
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if (!isCheckedException(ex)) {
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return true;
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}
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if (declaredExceptions != null) {
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int i = 0;
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while (i < declaredExceptions.length) {
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if (declaredExceptions[i].isAssignableFrom(ex.getClass())) {
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return true;
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}
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i++;
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}
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}
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return false;
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}
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/**
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* Determine whether the given object is an array:
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* either an Object array or a primitive array.
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* @param obj the object to check
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*/
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public static boolean isArray(Object obj) {
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return (obj != null && obj.getClass().isArray());
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}
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/**
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* Determine whether the given array is empty:
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* i.e. <code>null</code> or of zero length.
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* @param array the array to check
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*/
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public static boolean isEmpty(Object[] array) {
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return (array == null || array.length == 0);
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}
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/**
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* Check whether the given array contains the given element.
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* @param array the array to check (may be <code>null</code>,
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* in which case the return value will always be <code>false</code>)
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* @param element the element to check for
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* @return whether the element has been found in the given array
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*/
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public static boolean containsElement(Object[] array, Object element) {
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if (array == null) {
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return false;
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}
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for (Object arrayEle : array) {
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if (nullSafeEquals(arrayEle, element)) {
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return true;
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}
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}
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return false;
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}
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/**
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* Append the given Object to the given array, returning a new array
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* consisting of the input array contents plus the given Object.
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* @param array the array to append to (can be <code>null</code>)
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* @param obj the Object to append
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* @return the new array (of the same component type; never <code>null</code>)
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*/
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public static Object[] addObjectToArray(Object[] array, Object obj) {
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Class<?> compType = Object.class;
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if (array != null) {
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compType = array.getClass().getComponentType();
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}
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else if (obj != null) {
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compType = obj.getClass();
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}
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int newArrLength = (array != null ? array.length + 1 : 1);
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Object[] newArr = (Object[]) Array.newInstance(compType, newArrLength);
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if (array != null) {
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System.arraycopy(array, 0, newArr, 0, array.length);
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}
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newArr[newArr.length - 1] = obj;
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return newArr;
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}
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/**
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* Convert the given array (which may be a primitive array) to an
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* object array (if necessary of primitive wrapper objects).
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* <p>A <code>null</code> source value will be converted to an
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* empty Object array.
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* @param source the (potentially primitive) array
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* @return the corresponding object array (never <code>null</code>)
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* @throws IllegalArgumentException if the parameter is not an array
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*/
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public static Object[] toObjectArray(Object source) {
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if (source instanceof Object[]) {
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return (Object[]) source;
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}
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if (source == null) {
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return new Object[0];
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}
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if (!source.getClass().isArray()) {
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throw new IllegalArgumentException("Source is not an array: " + source);
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}
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int length = Array.getLength(source);
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if (length == 0) {
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return new Object[0];
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}
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Class<?> wrapperType = Array.get(source, 0).getClass();
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Object[] newArray = (Object[]) Array.newInstance(wrapperType, length);
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for (int i = 0; i < length; i++) {
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newArray[i] = Array.get(source, i);
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}
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return newArray;
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}
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//---------------------------------------------------------------------
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// Convenience methods for content-based equality/hash-code handling
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//---------------------------------------------------------------------
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/**
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* Determine if the given objects are equal, returning <code>true</code>
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* if both are <code>null</code> or <code>false</code> if only one is
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* <code>null</code>.
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* <p>Compares arrays with <code>Arrays.equals</code>, performing an equality
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* check based on the array elements rather than the array reference.
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* @param o1 first Object to compare
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* @param o2 second Object to compare
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* @return whether the given objects are equal
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* @see Arrays#equals
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*/
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public static boolean nullSafeEquals(Object o1, Object o2) {
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if (o1 == o2) {
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return true;
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}
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if (o1 == null || o2 == null) {
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return false;
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}
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if (o1.equals(o2)) {
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return true;
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}
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if (o1.getClass().isArray() && o2.getClass().isArray()) {
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if (o1 instanceof Object[] && o2 instanceof Object[]) {
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return Arrays.equals((Object[]) o1, (Object[]) o2);
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}
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if (o1 instanceof boolean[] && o2 instanceof boolean[]) {
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return Arrays.equals((boolean[]) o1, (boolean[]) o2);
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}
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if (o1 instanceof byte[] && o2 instanceof byte[]) {
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return Arrays.equals((byte[]) o1, (byte[]) o2);
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}
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if (o1 instanceof char[] && o2 instanceof char[]) {
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return Arrays.equals((char[]) o1, (char[]) o2);
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}
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if (o1 instanceof double[] && o2 instanceof double[]) {
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return Arrays.equals((double[]) o1, (double[]) o2);
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}
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if (o1 instanceof float[] && o2 instanceof float[]) {
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return Arrays.equals((float[]) o1, (float[]) o2);
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}
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if (o1 instanceof int[] && o2 instanceof int[]) {
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return Arrays.equals((int[]) o1, (int[]) o2);
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}
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if (o1 instanceof long[] && o2 instanceof long[]) {
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return Arrays.equals((long[]) o1, (long[]) o2);
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}
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if (o1 instanceof short[] && o2 instanceof short[]) {
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return Arrays.equals((short[]) o1, (short[]) o2);
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}
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}
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return false;
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}
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/**
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* Return as hash code for the given object; typically the value of
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* <code>{@link Object#hashCode()}</code>. If the object is an array,
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* this method will delegate to any of the <code>nullSafeHashCode</code>
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* methods for arrays in this class. If the object is <code>null</code>,
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* this method returns 0.
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* @see #nullSafeHashCode(Object[])
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* @see #nullSafeHashCode(boolean[])
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* @see #nullSafeHashCode(byte[])
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* @see #nullSafeHashCode(char[])
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* @see #nullSafeHashCode(double[])
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* @see #nullSafeHashCode(float[])
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* @see #nullSafeHashCode(int[])
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* @see #nullSafeHashCode(long[])
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* @see #nullSafeHashCode(short[])
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*/
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public static int nullSafeHashCode(Object obj) {
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if (obj == null) {
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return 0;
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}
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if (obj.getClass().isArray()) {
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if (obj instanceof Object[]) {
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return nullSafeHashCode((Object[]) obj);
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}
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if (obj instanceof boolean[]) {
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return nullSafeHashCode((boolean[]) obj);
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}
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if (obj instanceof byte[]) {
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return nullSafeHashCode((byte[]) obj);
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}
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if (obj instanceof char[]) {
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return nullSafeHashCode((char[]) obj);
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}
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if (obj instanceof double[]) {
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return nullSafeHashCode((double[]) obj);
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}
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if (obj instanceof float[]) {
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return nullSafeHashCode((float[]) obj);
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}
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if (obj instanceof int[]) {
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return nullSafeHashCode((int[]) obj);
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}
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if (obj instanceof long[]) {
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return nullSafeHashCode((long[]) obj);
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}
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if (obj instanceof short[]) {
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return nullSafeHashCode((short[]) obj);
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}
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}
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return obj.hashCode();
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}
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/**
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* Return a hash code based on the contents of the specified array.
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* If <code>array</code> is <code>null</code>, this method returns 0.
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*/
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public static int nullSafeHashCode(Object[] array) {
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if (array == null) {
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return 0;
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}
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int hash = INITIAL_HASH;
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int arraySize = array.length;
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for (int i = 0; i < arraySize; i++) {
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hash = MULTIPLIER * hash + nullSafeHashCode(array[i]);
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}
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return hash;
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}
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/**
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* Return a hash code based on the contents of the specified array.
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* If <code>array</code> is <code>null</code>, this method returns 0.
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*/
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public static int nullSafeHashCode(boolean[] array) {
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if (array == null) {
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return 0;
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}
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int hash = INITIAL_HASH;
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int arraySize = array.length;
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for (int i = 0; i < arraySize; i++) {
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hash = MULTIPLIER * hash + hashCode(array[i]);
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}
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return hash;
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}
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/**
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* Return a hash code based on the contents of the specified array.
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* If <code>array</code> is <code>null</code>, this method returns 0.
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*/
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public static int nullSafeHashCode(byte[] array) {
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if (array == null) {
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return 0;
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}
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int hash = INITIAL_HASH;
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int arraySize = array.length;
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for (int i = 0; i < arraySize; i++) {
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hash = MULTIPLIER * hash + array[i];
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}
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return hash;
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}
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/**
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* Return a hash code based on the contents of the specified array.
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* If <code>array</code> is <code>null</code>, this method returns 0.
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*/
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public static int nullSafeHashCode(char[] array) {
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if (array == null) {
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return 0;
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}
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int hash = INITIAL_HASH;
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int arraySize = array.length;
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for (int i = 0; i < arraySize; i++) {
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hash = MULTIPLIER * hash + array[i];
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}
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return hash;
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}
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/**
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* Return a hash code based on the contents of the specified array.
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* If <code>array</code> is <code>null</code>, this method returns 0.
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*/
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public static int nullSafeHashCode(double[] array) {
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if (array == null) {
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return 0;
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}
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int hash = INITIAL_HASH;
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int arraySize = array.length;
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for (int i = 0; i < arraySize; i++) {
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hash = MULTIPLIER * hash + hashCode(array[i]);
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}
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return hash;
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}
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/**
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* Return a hash code based on the contents of the specified array.
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* If <code>array</code> is <code>null</code>, this method returns 0.
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*/
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public static int nullSafeHashCode(float[] array) {
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if (array == null) {
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return 0;
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}
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int hash = INITIAL_HASH;
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int arraySize = array.length;
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for (int i = 0; i < arraySize; i++) {
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hash = MULTIPLIER * hash + hashCode(array[i]);
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}
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return hash;
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}
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/**
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* Return a hash code based on the contents of the specified array.
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* If <code>array</code> is <code>null</code>, this method returns 0.
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*/
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public static int nullSafeHashCode(int[] array) {
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if (array == null) {
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return 0;
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}
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int hash = INITIAL_HASH;
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int arraySize = array.length;
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for (int i = 0; i < arraySize; i++) {
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hash = MULTIPLIER * hash + array[i];
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}
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return hash;
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}
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/**
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* Return a hash code based on the contents of the specified array.
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* If <code>array</code> is <code>null</code>, this method returns 0.
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*/
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public static int nullSafeHashCode(long[] array) {
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if (array == null) {
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return 0;
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}
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int hash = INITIAL_HASH;
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int arraySize = array.length;
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for (int i = 0; i < arraySize; i++) {
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hash = MULTIPLIER * hash + hashCode(array[i]);
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}
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return hash;
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}
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/**
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* Return a hash code based on the contents of the specified array.
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* If <code>array</code> is <code>null</code>, this method returns 0.
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*/
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public static int nullSafeHashCode(short[] array) {
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if (array == null) {
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return 0;
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}
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int hash = INITIAL_HASH;
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int arraySize = array.length;
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for (int i = 0; i < arraySize; i++) {
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hash = MULTIPLIER * hash + array[i];
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}
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return hash;
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}
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/**
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* Return the same value as <code>{@link Boolean#hashCode()}</code>.
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* @see Boolean#hashCode()
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*/
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public static int hashCode(boolean bool) {
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return bool ? 1231 : 1237;
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}
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/**
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* Return the same value as <code>{@link Double#hashCode()}</code>.
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* @see Double#hashCode()
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*/
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public static int hashCode(double dbl) {
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long bits = Double.doubleToLongBits(dbl);
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return hashCode(bits);
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}
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/**
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* Return the same value as <code>{@link Float#hashCode()}</code>.
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* @see Float#hashCode()
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*/
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public static int hashCode(float flt) {
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return Float.floatToIntBits(flt);
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}
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/**
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* Return the same value as <code>{@link Long#hashCode()}</code>.
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* @see Long#hashCode()
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*/
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public static int hashCode(long lng) {
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return (int) (lng ^ (lng >>> 32));
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}
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//---------------------------------------------------------------------
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// Convenience methods for toString output
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//---------------------------------------------------------------------
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/**
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* Return a String representation of an object's overall identity.
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* @param obj the object (may be <code>null</code>)
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* @return the object's identity as String representation,
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* or an empty String if the object was <code>null</code>
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*/
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public static String identityToString(Object obj) {
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if (obj == null) {
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return EMPTY_STRING;
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}
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return obj.getClass().getName() + "@" + getIdentityHexString(obj);
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}
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/**
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* Return a hex String form of an object's identity hash code.
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* @param obj the object
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* @return the object's identity code in hex notation
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*/
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public static String getIdentityHexString(Object obj) {
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return Integer.toHexString(System.identityHashCode(obj));
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}
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/**
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* Return a content-based String representation if <code>obj</code> is
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* not <code>null</code>; otherwise returns an empty String.
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* <p>Differs from {@link #nullSafeToString(Object)} in that it returns
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* an empty String rather than "null" for a <code>null</code> value.
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* @param obj the object to build a display String for
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* @return a display String representation of <code>obj</code>
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* @see #nullSafeToString(Object)
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*/
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public static String getDisplayString(Object obj) {
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if (obj == null) {
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return EMPTY_STRING;
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}
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return nullSafeToString(obj);
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}
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/**
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* Determine the class name for the given object.
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* <p>Returns <code>"null"</code> if <code>obj</code> is <code>null</code>.
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* @param obj the object to introspect (may be <code>null</code>)
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* @return the corresponding class name
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*/
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public static String nullSafeClassName(Object obj) {
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return (obj != null ? obj.getClass().getName() : NULL_STRING);
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}
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/**
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* Return a String representation of the specified Object.
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* <p>Builds a String representation of the contents in case of an array.
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* Returns <code>"null"</code> if <code>obj</code> is <code>null</code>.
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* @param obj the object to build a String representation for
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* @return a String representation of <code>obj</code>
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*/
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public static String nullSafeToString(Object obj) {
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if (obj == null) {
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return NULL_STRING;
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}
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if (obj instanceof String) {
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return (String) obj;
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}
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if (obj instanceof Object[]) {
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return nullSafeToString((Object[]) obj);
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}
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if (obj instanceof boolean[]) {
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return nullSafeToString((boolean[]) obj);
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}
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if (obj instanceof byte[]) {
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return nullSafeToString((byte[]) obj);
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}
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if (obj instanceof char[]) {
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return nullSafeToString((char[]) obj);
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}
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if (obj instanceof double[]) {
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return nullSafeToString((double[]) obj);
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}
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if (obj instanceof float[]) {
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return nullSafeToString((float[]) obj);
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}
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if (obj instanceof int[]) {
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return nullSafeToString((int[]) obj);
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}
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if (obj instanceof long[]) {
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return nullSafeToString((long[]) obj);
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}
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if (obj instanceof short[]) {
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return nullSafeToString((short[]) obj);
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}
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String str = obj.toString();
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return (str != null ? str : EMPTY_STRING);
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}
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/**
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* Return a String representation of the contents of the specified array.
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* <p>The String representation consists of a list of the array's elements,
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* enclosed in curly braces (<code>"{}"</code>). Adjacent elements are separated
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* by the characters <code>", "</code> (a comma followed by a space). Returns
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* <code>"null"</code> if <code>array</code> is <code>null</code>.
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* @param array the array to build a String representation for
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* @return a String representation of <code>array</code>
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*/
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public static String nullSafeToString(Object[] array) {
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if (array == null) {
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return NULL_STRING;
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}
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int length = array.length;
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if (length == 0) {
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return EMPTY_ARRAY;
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}
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StringBuilder sb = new StringBuilder();
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for (int i = 0; i < length; i++) {
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if (i == 0) {
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sb.append(ARRAY_START);
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}
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else {
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sb.append(ARRAY_ELEMENT_SEPARATOR);
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}
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sb.append(String.valueOf(array[i]));
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}
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sb.append(ARRAY_END);
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return sb.toString();
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}
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/**
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* Return a String representation of the contents of the specified array.
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* <p>The String representation consists of a list of the array's elements,
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* enclosed in curly braces (<code>"{}"</code>). Adjacent elements are separated
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* by the characters <code>", "</code> (a comma followed by a space). Returns
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* <code>"null"</code> if <code>array</code> is <code>null</code>.
|
* @param array the array to build a String representation for
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* @return a String representation of <code>array</code>
|
*/
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public static String nullSafeToString(boolean[] array) {
|
if (array == null) {
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return NULL_STRING;
|
}
|
int length = array.length;
|
if (length == 0) {
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return EMPTY_ARRAY;
|
}
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StringBuilder sb = new StringBuilder();
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for (int i = 0; i < length; i++) {
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if (i == 0) {
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sb.append(ARRAY_START);
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}
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else {
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sb.append(ARRAY_ELEMENT_SEPARATOR);
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}
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sb.append(array[i]);
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}
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sb.append(ARRAY_END);
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return sb.toString();
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}
|
|
/**
|
* Return a String representation of the contents of the specified array.
|
* <p>The String representation consists of a list of the array's elements,
|
* enclosed in curly braces (<code>"{}"</code>). Adjacent elements are separated
|
* by the characters <code>", "</code> (a comma followed by a space). Returns
|
* <code>"null"</code> if <code>array</code> is <code>null</code>.
|
* @param array the array to build a String representation for
|
* @return a String representation of <code>array</code>
|
*/
|
public static String nullSafeToString(byte[] array) {
|
if (array == null) {
|
return NULL_STRING;
|
}
|
int length = array.length;
|
if (length == 0) {
|
return EMPTY_ARRAY;
|
}
|
StringBuilder sb = new StringBuilder();
|
for (int i = 0; i < length; i++) {
|
if (i == 0) {
|
sb.append(ARRAY_START);
|
}
|
else {
|
sb.append(ARRAY_ELEMENT_SEPARATOR);
|
}
|
sb.append(array[i]);
|
}
|
sb.append(ARRAY_END);
|
return sb.toString();
|
}
|
|
/**
|
* Return a String representation of the contents of the specified array.
|
* <p>The String representation consists of a list of the array's elements,
|
* enclosed in curly braces (<code>"{}"</code>). Adjacent elements are separated
|
* by the characters <code>", "</code> (a comma followed by a space). Returns
|
* <code>"null"</code> if <code>array</code> is <code>null</code>.
|
* @param array the array to build a String representation for
|
* @return a String representation of <code>array</code>
|
*/
|
public static String nullSafeToString(char[] array) {
|
if (array == null) {
|
return NULL_STRING;
|
}
|
int length = array.length;
|
if (length == 0) {
|
return EMPTY_ARRAY;
|
}
|
StringBuilder sb = new StringBuilder();
|
for (int i = 0; i < length; i++) {
|
if (i == 0) {
|
sb.append(ARRAY_START);
|
}
|
else {
|
sb.append(ARRAY_ELEMENT_SEPARATOR);
|
}
|
sb.append("'").append(array[i]).append("'");
|
}
|
sb.append(ARRAY_END);
|
return sb.toString();
|
}
|
|
/**
|
* Return a String representation of the contents of the specified array.
|
* <p>The String representation consists of a list of the array's elements,
|
* enclosed in curly braces (<code>"{}"</code>). Adjacent elements are separated
|
* by the characters <code>", "</code> (a comma followed by a space). Returns
|
* <code>"null"</code> if <code>array</code> is <code>null</code>.
|
* @param array the array to build a String representation for
|
* @return a String representation of <code>array</code>
|
*/
|
public static String nullSafeToString(double[] array) {
|
if (array == null) {
|
return NULL_STRING;
|
}
|
int length = array.length;
|
if (length == 0) {
|
return EMPTY_ARRAY;
|
}
|
StringBuilder sb = new StringBuilder();
|
for (int i = 0; i < length; i++) {
|
if (i == 0) {
|
sb.append(ARRAY_START);
|
}
|
else {
|
sb.append(ARRAY_ELEMENT_SEPARATOR);
|
}
|
|
sb.append(array[i]);
|
}
|
sb.append(ARRAY_END);
|
return sb.toString();
|
}
|
|
/**
|
* Return a String representation of the contents of the specified array.
|
* <p>The String representation consists of a list of the array's elements,
|
* enclosed in curly braces (<code>"{}"</code>). Adjacent elements are separated
|
* by the characters <code>", "</code> (a comma followed by a space). Returns
|
* <code>"null"</code> if <code>array</code> is <code>null</code>.
|
* @param array the array to build a String representation for
|
* @return a String representation of <code>array</code>
|
*/
|
public static String nullSafeToString(float[] array) {
|
if (array == null) {
|
return NULL_STRING;
|
}
|
int length = array.length;
|
if (length == 0) {
|
return EMPTY_ARRAY;
|
}
|
StringBuilder sb = new StringBuilder();
|
for (int i = 0; i < length; i++) {
|
if (i == 0) {
|
sb.append(ARRAY_START);
|
}
|
else {
|
sb.append(ARRAY_ELEMENT_SEPARATOR);
|
}
|
|
sb.append(array[i]);
|
}
|
sb.append(ARRAY_END);
|
return sb.toString();
|
}
|
|
/**
|
* Return a String representation of the contents of the specified array.
|
* <p>The String representation consists of a list of the array's elements,
|
* enclosed in curly braces (<code>"{}"</code>). Adjacent elements are separated
|
* by the characters <code>", "</code> (a comma followed by a space). Returns
|
* <code>"null"</code> if <code>array</code> is <code>null</code>.
|
* @param array the array to build a String representation for
|
* @return a String representation of <code>array</code>
|
*/
|
public static String nullSafeToString(int[] array) {
|
if (array == null) {
|
return NULL_STRING;
|
}
|
int length = array.length;
|
if (length == 0) {
|
return EMPTY_ARRAY;
|
}
|
StringBuilder sb = new StringBuilder();
|
for (int i = 0; i < length; i++) {
|
if (i == 0) {
|
sb.append(ARRAY_START);
|
}
|
else {
|
sb.append(ARRAY_ELEMENT_SEPARATOR);
|
}
|
sb.append(array[i]);
|
}
|
sb.append(ARRAY_END);
|
return sb.toString();
|
}
|
|
/**
|
* Return a String representation of the contents of the specified array.
|
* <p>The String representation consists of a list of the array's elements,
|
* enclosed in curly braces (<code>"{}"</code>). Adjacent elements are separated
|
* by the characters <code>", "</code> (a comma followed by a space). Returns
|
* <code>"null"</code> if <code>array</code> is <code>null</code>.
|
* @param array the array to build a String representation for
|
* @return a String representation of <code>array</code>
|
*/
|
public static String nullSafeToString(long[] array) {
|
if (array == null) {
|
return NULL_STRING;
|
}
|
int length = array.length;
|
if (length == 0) {
|
return EMPTY_ARRAY;
|
}
|
StringBuilder sb = new StringBuilder();
|
for (int i = 0; i < length; i++) {
|
if (i == 0) {
|
sb.append(ARRAY_START);
|
}
|
else {
|
sb.append(ARRAY_ELEMENT_SEPARATOR);
|
}
|
sb.append(array[i]);
|
}
|
sb.append(ARRAY_END);
|
return sb.toString();
|
}
|
|
/**
|
* Return a String representation of the contents of the specified array.
|
* <p>The String representation consists of a list of the array's elements,
|
* enclosed in curly braces (<code>"{}"</code>). Adjacent elements are separated
|
* by the characters <code>", "</code> (a comma followed by a space). Returns
|
* <code>"null"</code> if <code>array</code> is <code>null</code>.
|
* @param array the array to build a String representation for
|
* @return a String representation of <code>array</code>
|
*/
|
public static String nullSafeToString(short[] array) {
|
if (array == null) {
|
return NULL_STRING;
|
}
|
int length = array.length;
|
if (length == 0) {
|
return EMPTY_ARRAY;
|
}
|
StringBuilder sb = new StringBuilder();
|
for (int i = 0; i < length; i++) {
|
if (i == 0) {
|
sb.append(ARRAY_START);
|
}
|
else {
|
sb.append(ARRAY_ELEMENT_SEPARATOR);
|
}
|
sb.append(array[i]);
|
}
|
sb.append(ARRAY_END);
|
return sb.toString();
|
}
|
|
}
|
