package com.hcks.cmfds.commons.lang;

import java.io.Serializable;


/**
 * 
 * 查询时的顺序
 * 
 * @author：liusha
 * @date：Feb 3, 2011 11:12:44 AM
 */

public class QueryOrder implements Serializable {

	private static final long serialVersionUID = 5291198501266064857L;
	
	/**
	 * 是否升序
	 */
	private boolean ascending;
	
	/**
	 * 忽略排序
	 */
	private boolean ignoreCase;
	
	public boolean isIgnoreCase() {
		return ignoreCase;
	}

	public void setIgnoreCase(boolean ignoreCase) {
		this.ignoreCase = ignoreCase;
	}

	/**
	 * 属性名称
	 */
	private String propertyName;
	
	/**
	 * 返回字符串
	 */
	public String toString(){
		return propertyName + " " +(ascending ? "asc" : "desc"); 
	}
	
	/**
	 * 带参数的构造方法
	 * @param propertyName
	 * @param ascending
	 */
	public QueryOrder(String propertyName,boolean ascending){
		this.propertyName = propertyName;
		this.ascending = ascending;
	}
	
	/**
	 * 带参数的构造方法
	 * @param propertyName
	 * @param ascending
	 */
	public QueryOrder(String propertyName,String  ascending){
		
		this.propertyName = propertyName;
		
		
		if(null !=ascending)
		{
			if(ascending.equals("asc"))
			{
				this.ascending = true;
			}else if(ascending.equals("desc"))
			{
				this.ascending = false;
			}
		}
		
	}
	
	/**
	 * 静态方法：返回升序的QueryOrder实例
	 * @param propertyName
	 * @return
	 */
	public static QueryOrder asc(String propertyName){
		return new QueryOrder(propertyName,true);
	}
	
	/**
	 * 静态方法：返回降序的QueryOrder实例
	 * @param propertyName
	 * @return
	 */
	public static QueryOrder desc(String propertyName){
		return new QueryOrder(propertyName,false);
	}
	
	/**
	 * 忽略排序方法
	 * @return
	 */
	public QueryOrder ignoreCase(){
		ignoreCase = true;
		return this;
	}
	
	public void appendSqlOrder(StringBuilder sb){
		if(sb == null)
			sb = new StringBuilder();
		if(sb.toString().indexOf("order by") == -1){
			sb.append(" order by ");
		}
		sb.append(" ").append(toString());
	}
	
	public void appendSqlOrder(StringBuilder sb,boolean isSplit){
		if(sb == null)
			sb = new StringBuilder();
		if(sb.toString().indexOf("order by") == -1){
			sb.append(" order by ");
		}
	
		if(isSplit)
		{
			sb.append(" ").append(toString()).append(",");
		}else
		{
			sb.append(" ").append(toString());
		}
		
	}
}