Page的orderBy属性兼容包含字段和排序方向的情况

 
  
/**
* Copyright (c) 2005-2010 springside.org.cn
*
* Licensed under the Apache License, Version 2.0 (the "License");
*
* $Id: Page.java 1183 2010-08-28 08:05:49Z calvinxiu $
*/
package org . springside . modules . orm ;
import java.util.HashMap ;
import java.util.List ;
import java.util.Map ;
import org.apache.commons.lang.StringUtils ;
import com.google.common.collect.Lists ;
/**
* 与具体ORM实现无关的分页参数及查询结果封装.
*
* 注意所有序号从1开始.
*
* @param Page中记录的类型.
*
* @author calvin
*/
public class Page < T > {
         //-- 公共变量 --//
         public static final String ASC = "asc" ;
         public static final String DESC = "desc" ;
         //-- 分页参数 --//
         protected int pageNo = 1 ;
         protected int pageSize = - 1 ;
         protected String orderBy = null ;
         protected String order = null ;
         protected boolean autoCount = true ;
         //-- jqGrid参数 --//
         protected String search ;
         protected GridFilter filters = new GridFilter ();
         //-- 返回结果 --//
         protected List < T > result = Lists . newArrayList ();
         protected long totalCount = - 1 ;
         // 附加信息
         protected Map < String , Object > attachValues = new HashMap < String , Object >();
         //-- 构造函数 --//
         public Page () {
         }
         public Page ( int pageSize ) {
                 this . pageSize = pageSize ;
         }
         //-- 分页参数访问函数 --//
         /**
         * 获得当前页的页号,序号从1开始,默认为1.
         */
         public int getPageNo () {
                 return pageNo ;
         }
         /**
         * 设置当前页的页号,序号从1开始,低于1时自动调整为1.
         */
         public void setPageNo ( final int pageNo ) {
                 this . pageNo = pageNo ;
                 if ( pageNo < 1 ) {
                         this . pageNo = 1 ;
                 }
         }
         /**
         * 返回Page对象自身的setPageNo函数,可用于连续设置。
         */
         public Page < T > pageNo ( final int thePageNo ) {
                 setPageNo ( thePageNo );
                 return this ;
         }
         /**
         * 获得每页的记录数量, 默认为-1.
         */
         public int getPageSize () {
                 return pageSize ;
         }
         /**
         * 设置每页的记录数量.
         */
         public void setPageSize ( final int pageSize ) {
                 this . pageSize = pageSize ;
         }
         /**
         * 返回Page对象自身的setPageSize函数,可用于连续设置。
         */
         public Page < T > pageSize ( final int thePageSize ) {
                 setPageSize ( thePageSize );
                 return this ;
         }
         /**
         * 根据pageNo和pageSize计算当前页第一条记录在总结果集中的位置,序号从1开始.
         */
         public int getFirst () {
                 return (( pageNo - 1 ) * pageSize ) + 1 ;
         }
         /**
         * 获得排序字段,无默认值. 多个排序字段时用','分隔.
         */
         public String getOrderBy () {
                 String [] split = orderBy . split ( " " );
                 return split . length == 1 ? orderBy : split [ 0 ];
         }
         /**
         * 设置排序字段,多个排序字段时用','分隔.
         */
         public void setOrderBy ( final String orderBy ) {
                 this . orderBy = orderBy ;
         }
         /**
         * 返回Page对象自身的setOrderBy函数,可用于连续设置。
         */
         public Page < T > orderBy ( final String theOrderBy ) {
                 setOrderBy ( theOrderBy );
                 return this ;
         }
         /**
         * 获得排序方向, 无默认值.
         */
         public String getOrder () {
                 return order ;
         }
         /**
         * 设置排序方式向.
         *
         * @param order 可选值为desc或asc,多个排序字段时用','分隔.
         */
         public void setOrder ( final String order ) {
                 String lowcaseOrder = StringUtils . lowerCase ( order );
                 //检查order字符串的合法值
                 String [] orders = StringUtils . split ( lowcaseOrder , ',' );
                 for ( String orderStr : orders ) {
                         if (! StringUtils . equals ( DESC , orderStr ) && ! StringUtils . equals ( ASC , orderStr )) {
                                 throw new IllegalArgumentException ( "排序方向" + orderStr + "不是合法值" );
                         }
                 }
                 this . order = lowcaseOrder ;
         }
         /**
         * 返回Page对象自身的setOrder函数,可用于连续设置。
         */
         public Page < T > order ( final String theOrder ) {
                 setOrder ( theOrder );
                 return this ;
         }
         /**
         * 是否已设置排序字段,无默认值.
         */
         public boolean isOrderBySetted () {
                 return ( StringUtils . isNotBlank ( orderBy ) && StringUtils . isNotBlank ( order ));
         }
         /**
         * 获得查询对象时是否先自动执行count查询获取总记录数, 默认为false.
         */
         public boolean isAutoCount () {
                 return autoCount ;
         }
         /**
         * 设置查询对象时是否自动先执行count查询获取总记录数.
         */
         public void setAutoCount ( final boolean autoCount ) {
                 this . autoCount = autoCount ;
         }
         /**
         * 返回Page对象自身的setAutoCount函数,可用于连续设置。
         */
         public Page < T > autoCount ( final boolean theAutoCount ) {
                 setAutoCount ( theAutoCount );
                 return this ;
         }
         //-- 访问查询结果函数 --//
         /**
         * 获得页内的记录列表.
         */
         public List < T > getResult () {
                 return result ;
         }
         /**
         * 设置页内的记录列表.
         */
         public void setResult ( final List < T > result ) {
                 this . result = result ;
         }
         /**
         * 获得总记录数, 默认值为-1.
         */
         public long getTotalCount () {
                 return totalCount ;
         }
         /**
         * 设置总记录数.
         */
         public void setTotalCount ( final long totalCount ) {
                 this . totalCount = totalCount ;
         }
         /**
         * 根据pageSize与totalCount计算总页数, 默认值为-1.
         */
         public long getTotalPages () {
                 if ( totalCount < 0 ) {
                         return - 1 ;
                 }
                 long count = totalCount / pageSize ;
                 if ( totalCount % pageSize > 0 ) {
                         count ++;
                 }
                 return count ;
         }
         /**
         * 是否还有下一页.
         */
         public boolean isHasNext () {
                 return ( pageNo + 1 <= getTotalPages ());
         }
         /**
         * 取得下页的页号, 序号从1开始.
         * 当前页为尾页时仍返回尾页序号.
         */
         public int getNextPage () {
                 if ( isHasNext ()) {
                         return pageNo + 1 ;
                 } else {
                         return pageNo ;
                 }
         }
         /**
         * 是否还有上一页.
         */
         public boolean isHasPre () {
                 return ( pageNo - 1 >= 1 );
         }
         /**
         * 取得上页的页号, 序号从1开始.
         * 当前页为首页时返回首页序号.
         */
         public int getPrePage () {
                 if ( isHasPre ()) {
                         return pageNo - 1 ;
                 } else {
                         return pageNo ;
                 }
         }
         /**
         * 是否查询
         * @return
         */
         public boolean isSearch () {
                 Boolean isSearch = Boolean . valueOf ( search );
                 return isSearch ;
         }
         public void setSearch ( String search ) {
                 this . search = search ;
         }
         /**
         * 取得jqGrid的查询条件
         */
         public GridFilter getFilters () {
                 return filters ;
         }
         public void setFilters ( GridFilter filters ) {
                 this . filters = filters ;
         }
         public Map < String , Object > getAttachValues () {
                 return attachValues ;
         }
         public void setAttachValues ( Map < String , Object > attachValues ) {
                 this . attachValues = attachValues ;
         }
}

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