/*
* $Id: JSONObject.java,v 1.1 2006/04/15 14:10:48 platform Exp $
* Created on 2006-4-10
*/
package org.zkoss.json;
import java.util.LinkedHashMap;
import java.util.Iterator;
import java.util.Map;
/**
* A JSON object. Key value pairs are in the order of adding.
* JSONObject supports java.util.Map interface.
*
* @author FangYidong<fangyidong@yahoo.com.cn>
*/
public class JSONObject extends LinkedHashMap<Object, Object> implements Map<Object, Object>, JSONAware {
private static final long serialVersionUID = -503443796854799292L;
/**
* Convert (aka., encode) a map to JSON text. The result is a JSON object.
* If this map is also a JSONAware, JSONAware specific behaviors will be omitted at this top level.
*
* @see JSONValue#toJSONString(Object)
*
* @param map
* @return JSON text, or "null" if map is null.
*/
public static String toJSONString(Map map){
if(map == null)
return "null";
StringBuffer sb = new StringBuffer();
boolean first = true;
Iterator iter=map.entrySet().iterator();
sb.append('{');
while(iter.hasNext()){
if(first)
first = false;
else
sb.append(',');
Map.Entry entry=(Map.Entry)iter.next();
toJSONString(String.valueOf(entry.getKey()),entry.getValue(), sb);
}
sb.append('}');
return sb.toString();
}
/** Encodes this object to a JSON string.
* It is the same as {@link #toString()}.
*/
public String toJSONString(){
return toJSONString(this);
}
private static String toJSONString(String key,Object value, StringBuffer sb){
sb.append('\"');
if(key == null)
sb.append("null");
else
JSONValue.escape(key, sb);
sb.append('\"').append(':');
sb.append(JSONValue.toJSONString(value));
return sb.toString();
}
/** Encodes this object to a JSON string.
* It is the same as {@link #toJSONString()}.
*/
public String toString(){
return toJSONString();
}
public static String toString(String key,Object value){
StringBuffer sb = new StringBuffer();
toJSONString(key, value, sb);
return sb.toString();
}
}