package com.walker.infrastructure.utils;

import java.io.File;
import java.io.IOException;

/**
 * Utility methods for working with the file system.
 *
 * @author Rob Harrop
 * @author Juergen Hoeller
 * @since 2.5.3
 */
public abstract class FileSystemUtils {

	public static final String FILE_SCHEMA_WIN = "file:/";
	public static final String FILE_SCHEMA_STD    = "file:///";
	
	/**
	 * 去掉文件路径中的协议信息，如：
	 * <pre>
	 * file:///d:/test/my.log 去掉file:///
	 * 在windows系统中也可能是file:/
	 * </pre>
	 * @param path 给定文件全路径信息
	 * @return 返回修剪后的路径
	 */
	public static String trimFileSchema(String path){
		if(path.startsWith(FILE_SCHEMA_WIN)){
			path = path.substring(6);
		} else if(path.startsWith(FILE_SCHEMA_STD)){
			path = path.substring(8);
		}
		return path;
	}
	
	/**
	 * Delete the supplied {@link File} - for directories,
	 * recursively delete any nested directories or files as well.
	 * @param root the root <code>File</code> to delete
	 * @return <code>true</code> if the <code>File</code> was deleted,
	 * otherwise <code>false</code>
	 */
	public static boolean deleteRecursively(File root) {
		if (root != null && root.exists()) {
			if (root.isDirectory()) {
				File[] children = root.listFiles();
				if (children != null) {
					for (File child : children) {
						deleteRecursively(child);
					}
				}
			}
			return root.delete();
		}
		return false;
	}

	/**
	 * Recursively copy the contents of the <code>src</code> file/directory
	 * to the <code>dest</code> file/directory.
	 * @param src the source directory
	 * @param dest the destination directory
	 * @throws IOException in the case of I/O errors
	 */
	public static void copyRecursively(File src, File dest) throws IOException {
		Assert.isTrue(src != null && (src.isDirectory() || src.isFile()), "Source File must denote a directory or file");
		Assert.notNull(dest, "Destination File must not be null");
		doCopyRecursively(src, dest);
	}

	/**
	 * Actually copy the contents of the <code>src</code> file/directory
	 * to the <code>dest</code> file/directory.
	 * @param src the source directory
	 * @param dest the destination directory
	 * @throws IOException in the case of I/O errors
	 */
	private static void doCopyRecursively(File src, File dest) throws IOException {
		if (src.isDirectory()) {
			dest.mkdir();
			File[] entries = src.listFiles();
			if (entries == null) {
				throw new IOException("Could not list files in directory: " + src);
			}
			for (File entry : entries) {
				doCopyRecursively(entry, new File(dest, entry.getName()));
			}
		}
		else if (src.isFile()) {
			try {
				dest.createNewFile();
			}
			catch (IOException ex) {
				IOException ioex = new IOException("Failed to create file: " + dest);
				ioex.initCause(ex);
				throw ioex;
			}
			FileCopyUtils.copy(src, dest);
		}
		else {
			// Special File handle: neither a file not a directory.
			// Simply skip it when contained in nested directory...
		}
	}

	public static void main(String[] args) throws Exception{
		File file = new File("d:/report.log");
		if(file.exists()){
			System.out.println("ok.");
		} else
			System.out.println("? not found");
		System.out.println(file.getAbsolutePath());
		System.out.println(file.getCanonicalPath());
		System.out.println(file.toURI());
	}
}