json-simple/src/org/json/simple/JSONObject.java

/*
 * $Id: JSONObject.java,v 1.1 2006/04/15 14:10:48 platform Exp $
 * Created on 2006-4-10
 */
package org.json.simple;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

/**
 * @author FangYidong<fangyidong@yahoo.com.cn>
 */
public class JSONObject extends HashMap{
	
	public String toString(){
		ItemList list=new ItemList();
		Iterator iter=entrySet().iterator();
		
		while(iter.hasNext()){
			Map.Entry entry=(Map.Entry)iter.next();
			list.add(toString(entry.getKey().toString(),entry.getValue()));
		}
		return "{"+list.toString()+"}";
	}
	
	public static String toString(String key,Object value){
		StringBuffer sb=new StringBuffer();
		
		sb.append("\"");
		sb.append(escape(key));
		sb.append("\":");
		if(value==null){
			sb.append("null");
			return sb.toString();
		}
		
		if(value instanceof String){
			sb.append("\"");
			sb.append(escape((String)value));
			sb.append("\"");
		}
		else
			sb.append(value);
		return sb.toString();
	}
	
	/**
	 * " => \" , \ => \\
	 * @param s
	 * @return
	 */
	public static String escape(String s){
		if(s==null)
			return null;
		StringBuffer sb=new StringBuffer();
		for(int i=0;i<s.length();i++){
			char ch=s.charAt(i);
			switch(ch){
			case '"':
				sb.append("\\\"");
				break;
			case '\\':
				sb.append("\\\\");
				break;
			case '\b':
				sb.append("\\b");
				break;
			case '\f':
				sb.append("\\f");
				break;
			case '\n':
				sb.append("\\n");
				break;
			case '\r':
				sb.append("\\r");
				break;
			case '\t':
				sb.append("\\t");
				break;
			case '/':
				sb.append("\\/");
				break;
            case '\u0085': // Next Line
                sb.append("\\u0085");
                break;
            case '\u2028': // Line Separator
                sb.append("\\u2028");
                break;
            case '\u2029': // Paragraph Separator
                sb.append("\\u2029");
                break;
			default:
				if(ch>='\u0000' && ch<='\u001F'){
					String ss=Integer.toHexString(ch);
					sb.append("\\u");
					for(int k=0;k<4-ss.length();k++){
						sb.append('0');
					}
					sb.append(ss.toUpperCase());
				}
				else{
					sb.append(ch);
				}
			}
		}//for
		return sb.toString();
	}
}