package com.walker.db.page;
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import com.walker.infrastructure.core.NamedThreadLocal;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import java.util.List;
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import java.util.Map;
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/**
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* 可对集合数据分页的上下文对象定义</p>
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* 它能提供对数据分页的支持，通常使用数据库分页，但也提供对其他方式的分页，如：文件数据。</br>
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* 这是对可分页内容的一种简单抽象，系统默认提供了对数据库的分页支持。
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* @author shikeying
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* @date 2013-9-24
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*
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*/
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public abstract class ListPageContext {
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private static final transient Logger logger = LoggerFactory.getLogger(ListPageContext.class);
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// 分页参数的参数名称定义，通常在UI中会搜集这些数据
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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/**
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* 当前页-参数名称
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*/
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public static final String PARAM_NAME_PAGE_INDEX = "walker_page_index";
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/**
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* 每页显示条数-参数名称
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*/
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public static final String PARAM_NAME_PAGE_SIZE = "walker_page_size";
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// 默认值定义
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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public static final int DEFAULT_PAGE_SIZE = 1;
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private static final NamedThreadLocal<Integer> pageIndexLocals
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= new NamedThreadLocal<Integer>("pageIndexThreadLocal");
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private static final NamedThreadLocal<Integer> pageSizeLocals
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= new NamedThreadLocal<Integer>("pageSizeThreadLocal");
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private static final NamedThreadLocal<PageSearch> pageSearchLocals
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= new NamedThreadLocal<PageSearch>("pageSearchThreadLocal");
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/**
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* 从当前线程中返回当前页
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* @return
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*/
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public static final int getCurrentPageIndex(){
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Integer val = pageIndexLocals.get();
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if(val == null)
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return Pager.DEFAULT_PAGE_INDEX;
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return val.intValue();
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}
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/**
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* 从当前线程中返回[每页记录数]
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* @return
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*/
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public static final int getCurrentPageSize(){
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Integer val = pageSizeLocals.get();
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if(val == null)
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return Pager.DEFAULT_PAGE_SIZE;
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return val.intValue();
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}
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/**
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* 保存当前页信息到线程中
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* @param pageIndex
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*/
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public static void setCurrentPageIndex(int pageIndex){
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Integer _old = pageIndexLocals.get();
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if(logger.isDebugEnabled() && _old != null){
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logger.debug("exist pageIndex in '" + pageIndexLocals + "' : " + _old);
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}
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pageIndexLocals.set(pageIndex);
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}
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/**
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* 保存分页条数到线程中
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* @param pageSize
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*/
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public static void setCurrentPageSize(int pageSize){
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Integer _old = pageSizeLocals.get();
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if(logger.isDebugEnabled() && _old != null){
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logger.debug("exist pageIndex in '" + pageSizeLocals + "' : " + _old);
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}
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pageSizeLocals.set(pageSize);
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}
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public static void clearCurrentPageIndex(){
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pageIndexLocals.remove();
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}
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public static void clearCurrentPageSize(){
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pageSizeLocals.remove();
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}
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// 前端分页搜索条件相关，2022-11-16
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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public static final PageSearch getPageSearch(){
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return pageSearchLocals.get();
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}
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public static final void setPageSearch(PageSearch pageSearch){
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pageSearchLocals.set(pageSearch);
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}
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public static final void clearPageSearch(){
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pageSearchLocals.remove();
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}
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// 创建分页对象
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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/**
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* 返回带泛型的分页对象
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* @param datas 业务数据，如：List<T> data
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* @param pageIndex 页码值
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* @param pageSize 每页显示记录数
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* @param totalRows 总记录数
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* @return
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*/
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public static final <T> GenericPager<T> createGenericPager(List<T> datas, int pageIndex, int pageSize, int totalRows){
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// int _pageInde = getContextPageIndex(pageIndex);
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// int _pageSize = getContextPageSize(pageSize);
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// int startRowIndex = (_pageInde - _pageInde % _pageSize)/_pageSize;
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return new GenericPager<T>(datas
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, getContextPageIndex(pageIndex)
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, getContextPageSize(pageSize), totalRows);
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}
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/**
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* 返回带泛型的分页对象
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* @param datas 业务数据，如：List<T> data
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* @param pageIndex 页码值
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* @param totalRows 总记录数
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* @return
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*/
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public static final <T> GenericPager<T> createGenericPager(List<T> datas, int pageIndex, int totalRows){
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return new GenericPager<T>(datas
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, getContextPageIndex(pageIndex)
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, getContextPageSize(0), totalRows);
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}
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public static final <T> GenericPager<T> createGenericPager(int pageIndex, int pageSize, int totalRows){
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return new GenericPager<T>(null
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, getContextPageIndex(pageIndex)
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, getContextPageSize(pageSize), totalRows);
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}
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public static final <T> GenericPager<T> createEmptyGenericPager(){
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return new GenericPager<T>(null, 1, getContextPageSize(0), 0);
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}
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/**
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* 创建分页对象，业务类型为<code>Map<String, Object></code>
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* @param datas 业务数据，如：List<Map<String, Object>> data
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* @param pageIndex 页码值
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* @param pageSize 每页显示记录数
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* @param totalRows 总记录数
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* @return
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*/
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public static final MapPager createMapPager(List<Map<String, Object>> datas, int pageIndex, int pageSize, int totalRows){
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return new MapPager(datas
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, getContextPageIndex(pageIndex)
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, getContextPageSize(pageSize), totalRows);
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}
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/**
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* 创建分页对象，业务类型为<code>Map<String, Object></code>
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* @param datas
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* @param pageIndex
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* @param totalRows
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* @return
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*/
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public static final MapPager createMapPager(List<Map<String, Object>> datas, int pageIndex, int totalRows){
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return new MapPager(datas
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, getContextPageIndex(pageIndex)
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, getContextPageSize(0), totalRows);
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}
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/**
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* 创建UI层可用的分页展示对象
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* @param pager
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* @param jsMethod
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* @return
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*/
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public static final <T> PagerView<T> createPagerView(GenericPager<T> pager, String jsMethod){
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return new PagerView<T>(pager, jsMethod);
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}
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private static int getContextPageSize(int pageSizeValue){
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Integer _val = pageSizeLocals.get();
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if(_val != null)
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return _val.intValue();
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if(pageSizeValue <= 0)
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return Pager.DEFAULT_PAGE_SIZE;
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return pageSizeValue;
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}
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private static int getContextPageIndex(int pageIndexValue){
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Integer pageIndex = pageIndexLocals.get();
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if(pageIndex != null)
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return pageIndex.intValue();
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if(pageIndexValue <= 0)
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return Pager.DEFAULT_PAGE_INDEX;
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return pageIndexValue;
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}
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}
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