michael@0: /*
michael@0:  * $Id: JSONArray.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.ArrayList;
michael@0: import java.util.Iterator;
michael@0: import java.util.List;
michael@0: 
michael@0: 
michael@0: /**
michael@0:  * A JSON array. JSONObject supports java.util.List interface.
michael@0:  * 
michael@0:  * @author FangYidong<fangyidong@yahoo.com.cn>
michael@0:  */
michael@0: public class JSONArray extends ArrayList implements List, JSONAware, JSONStreamAware {
michael@0: 	private static final long serialVersionUID = 3957988303675231981L;
michael@0: 
michael@0:     /**
michael@0:      * Encode a list into JSON text and write it to out. 
michael@0:      * If this list is also a JSONStreamAware or a JSONAware, JSONStreamAware and JSONAware 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 list
michael@0:      * @param out
michael@0:      */
michael@0: 	public static void writeJSONString(List list, Writer out) throws IOException{
michael@0: 		if(list == null){
michael@0: 			out.write("null");
michael@0: 			return;
michael@0: 		}
michael@0: 		
michael@0: 		boolean first = true;
michael@0: 		Iterator iter=list.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:             
michael@0: 			Object value=iter.next();
michael@0: 			if(value == null){
michael@0: 				out.write("null");
michael@0: 				continue;
michael@0: 			}
michael@0: 			
michael@0: 			JSONValue.writeJSONString(value, 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 list to JSON text. The result is a JSON array. 
michael@0: 	 * If this list 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 list
michael@0: 	 * @return JSON text, or "null" if list is null.
michael@0: 	 */
michael@0: 	public static String toJSONString(List list){
michael@0: 		if(list == null)
michael@0: 			return "null";
michael@0: 		
michael@0:         boolean first = true;
michael@0:         StringBuffer sb = new StringBuffer();
michael@0: 		Iterator iter=list.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: 			Object value=iter.next();
michael@0: 			if(value == null){
michael@0: 				sb.append("null");
michael@0: 				continue;
michael@0: 			}
michael@0: 			sb.append(JSONValue.toJSONString(value));
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: 	public String toString() {
michael@0: 		return toJSONString();
michael@0: 	}
michael@0: 
michael@0: 	
michael@0: 		
michael@0: }