michael@0: /*
michael@0:  * $Id: JSONObject.java,v 1.1 2006/04/15 14:10:48 platform Exp $
michael@0:  * Created on 2006-4-10
michael@0:  */
michael@0: package org.json.simple;
michael@0: 
michael@0: import java.io.IOException;
michael@0: import java.io.Writer;
michael@0: import java.util.HashMap;
michael@0: import java.util.Iterator;
michael@0: import java.util.Map;
michael@0: 
michael@0: /**
michael@0:  * A JSON object. Key value pairs are unordered. JSONObject supports java.util.Map interface.
michael@0:  * 
michael@0:  * @author FangYidong<fangyidong@yahoo.com.cn>
michael@0:  */
michael@0: public class JSONObject extends HashMap implements Map, JSONAware, JSONStreamAware{
michael@0: 	private static final long serialVersionUID = -503443796854799292L;
michael@0: 
michael@0:     /**
michael@0:      * Encode a map into JSON text and write it to out.
michael@0:      * If this map is also a JSONAware or JSONStreamAware, JSONAware or JSONStreamAware specific behaviours will be ignored at this top level.
michael@0:      * 
michael@0:      * @see org.json.simple.JSONValue#writeJSONString(Object, Writer)
michael@0:      * 
michael@0:      * @param map
michael@0:      * @param out
michael@0:      */
michael@0: 	public static void writeJSONString(Map map, Writer out) throws IOException {
michael@0: 		if(map == null){
michael@0: 			out.write("null");
michael@0: 			return;
michael@0: 		}
michael@0: 		
michael@0: 		boolean first = true;
michael@0: 		Iterator iter=map.entrySet().iterator();
michael@0: 		
michael@0:         out.write('{');
michael@0: 		while(iter.hasNext()){
michael@0:             if(first)
michael@0:                 first = false;
michael@0:             else
michael@0:                 out.write(',');
michael@0: 			Map.Entry entry=(Map.Entry)iter.next();
michael@0:             out.write('\"');
michael@0:             out.write(escape(String.valueOf(entry.getKey())));
michael@0:             out.write('\"');
michael@0:             out.write(':');
michael@0: 			JSONValue.writeJSONString(entry.getValue(), out);
michael@0: 		}
michael@0: 		out.write('}');
michael@0: 	}
michael@0: 
michael@0: 	public void writeJSONString(Writer out) throws IOException{
michael@0: 		writeJSONString(this, out);
michael@0: 	}
michael@0: 	
michael@0: 	/**
michael@0: 	 * Convert a map to JSON text. The result is a JSON object. 
michael@0: 	 * If this map is also a JSONAware, JSONAware specific behaviours will be omitted at this top level.
michael@0: 	 * 
michael@0: 	 * @see org.json.simple.JSONValue#toJSONString(Object)
michael@0: 	 * 
michael@0: 	 * @param map
michael@0: 	 * @return JSON text, or "null" if map is null.
michael@0: 	 */
michael@0: 	public static String toJSONString(Map map){
michael@0: 		if(map == null)
michael@0: 			return "null";
michael@0: 		
michael@0:         StringBuffer sb = new StringBuffer();
michael@0:         boolean first = true;
michael@0: 		Iterator iter=map.entrySet().iterator();
michael@0: 		
michael@0:         sb.append('{');
michael@0: 		while(iter.hasNext()){
michael@0:             if(first)
michael@0:                 first = false;
michael@0:             else
michael@0:                 sb.append(',');
michael@0:             
michael@0: 			Map.Entry entry=(Map.Entry)iter.next();
michael@0: 			toJSONString(String.valueOf(entry.getKey()),entry.getValue(), sb);
michael@0: 		}
michael@0:         sb.append('}');
michael@0: 		return sb.toString();
michael@0: 	}
michael@0: 	
michael@0: 	public String toJSONString(){
michael@0: 		return toJSONString(this);
michael@0: 	}
michael@0: 	
michael@0: 	private static String toJSONString(String key,Object value, StringBuffer sb){
michael@0: 		sb.append('\"');
michael@0:         if(key == null)
michael@0:             sb.append("null");
michael@0:         else
michael@0:             JSONValue.escape(key, sb);
michael@0: 		sb.append('\"').append(':');
michael@0: 		
michael@0: 		sb.append(JSONValue.toJSONString(value));
michael@0: 		
michael@0: 		return sb.toString();
michael@0: 	}
michael@0: 	
michael@0: 	public String toString(){
michael@0: 		return toJSONString();
michael@0: 	}
michael@0: 
michael@0: 	public static String toString(String key,Object value){
michael@0:         StringBuffer sb = new StringBuffer();
michael@0: 		toJSONString(key, value, sb);
michael@0:         return sb.toString();
michael@0: 	}
michael@0: 	
michael@0: 	/**
michael@0: 	 * Escape quotes, \, /, \r, \n, \b, \f, \t and other control characters (U+0000 through U+001F).
michael@0: 	 * It's the same as JSONValue.escape() only for compatibility here.
michael@0: 	 * 
michael@0: 	 * @see org.json.simple.JSONValue#escape(String)
michael@0: 	 * 
michael@0: 	 * @param s
michael@0: 	 * @return
michael@0: 	 */
michael@0: 	public static String escape(String s){
michael@0: 		return JSONValue.escape(s);
michael@0: 	}
michael@0: }