michael@0: /*
michael@0:  * $Id: JSONValue.java,v 1.1 2006/04/15 14:37:04 platform Exp $
michael@0:  * Created on 2006-4-15
michael@0:  */
michael@0: package org.json.simple;
michael@0: 
michael@0: import java.io.IOException;
michael@0: import java.io.Reader;
michael@0: import java.io.StringReader;
michael@0: import java.io.Writer;
michael@0: import java.util.List;
michael@0: import java.util.Map;
michael@0: 
michael@0: import org.json.simple.parser.JSONParser;
michael@0: import org.json.simple.parser.ParseException;
michael@0: 
michael@0: 
michael@0: /**
michael@0:  * @author FangYidong<fangyidong@yahoo.com.cn>
michael@0:  */
michael@0: public class JSONValue {
michael@0: 	/**
michael@0: 	 * Parse JSON text into java object from the input source. 
michael@0: 	 * Please use parseWithException() if you don't want to ignore the exception.
michael@0: 	 * 
michael@0: 	 * @see org.json.simple.parser.JSONParser#parse(Reader)
michael@0: 	 * @see #parseWithException(Reader)
michael@0: 	 * 
michael@0: 	 * @param in
michael@0: 	 * @return Instance of the following:
michael@0: 	 *	org.json.simple.JSONObject,
michael@0: 	 * 	org.json.simple.JSONArray,
michael@0: 	 * 	java.lang.String,
michael@0: 	 * 	java.lang.Number,
michael@0: 	 * 	java.lang.Boolean,
michael@0: 	 * 	null
michael@0: 	 * 
michael@0: 	 */
michael@0: 	public static Object parse(Reader in){
michael@0: 		try{
michael@0: 			JSONParser parser=new JSONParser();
michael@0: 			return parser.parse(in);
michael@0: 		}
michael@0: 		catch(Exception e){
michael@0: 			return null;
michael@0: 		}
michael@0: 	}
michael@0: 	
michael@0: 	public static Object parse(String s){
michael@0: 		StringReader in=new StringReader(s);
michael@0: 		return parse(in);
michael@0: 	}
michael@0: 	
michael@0: 	/**
michael@0: 	 * Parse JSON text into java object from the input source.
michael@0: 	 * 
michael@0: 	 * @see org.json.simple.parser.JSONParser
michael@0: 	 * 
michael@0: 	 * @param in
michael@0: 	 * @return Instance of the following:
michael@0: 	 * 	org.json.simple.JSONObject,
michael@0: 	 * 	org.json.simple.JSONArray,
michael@0: 	 * 	java.lang.String,
michael@0: 	 * 	java.lang.Number,
michael@0: 	 * 	java.lang.Boolean,
michael@0: 	 * 	null
michael@0: 	 * 
michael@0: 	 * @throws IOException
michael@0: 	 * @throws ParseException
michael@0: 	 */
michael@0: 	public static Object parseWithException(Reader in) throws IOException, ParseException{
michael@0: 		JSONParser parser=new JSONParser();
michael@0: 		return parser.parse(in);
michael@0: 	}
michael@0: 	
michael@0: 	public static Object parseWithException(String s) throws ParseException{
michael@0: 		JSONParser parser=new JSONParser();
michael@0: 		return parser.parse(s);
michael@0: 	}
michael@0: 	
michael@0:     /**
michael@0:      * Encode an object into JSON text and write it to out.
michael@0:      * <p>
michael@0:      * If this object is a Map or a List, and it's also a JSONStreamAware or a JSONAware, JSONStreamAware or JSONAware will be considered firstly.
michael@0:      * <p>
michael@0:      * DO NOT call this method from writeJSONString(Writer) of a class that implements both JSONStreamAware and (Map or List) with 
michael@0:      * "this" as the first parameter, use JSONObject.writeJSONString(Map, Writer) or JSONArray.writeJSONString(List, Writer) instead. 
michael@0:      * 
michael@0:      * @see org.json.simple.JSONObject#writeJSONString(Map, Writer)
michael@0:      * @see org.json.simple.JSONArray#writeJSONString(List, Writer)
michael@0:      * 
michael@0:      * @param value
michael@0:      * @param writer
michael@0:      */
michael@0: 	public static void writeJSONString(Object value, Writer out) throws IOException {
michael@0: 		if(value == null){
michael@0: 			out.write("null");
michael@0: 			return;
michael@0: 		}
michael@0: 		
michael@0: 		if(value instanceof String){		
michael@0:             out.write('\"');
michael@0: 			out.write(escape((String)value));
michael@0:             out.write('\"');
michael@0: 			return;
michael@0: 		}
michael@0: 		
michael@0: 		if(value instanceof Double){
michael@0: 			if(((Double)value).isInfinite() || ((Double)value).isNaN())
michael@0: 				out.write("null");
michael@0: 			else
michael@0: 				out.write(value.toString());
michael@0: 			return;
michael@0: 		}
michael@0: 		
michael@0: 		if(value instanceof Float){
michael@0: 			if(((Float)value).isInfinite() || ((Float)value).isNaN())
michael@0: 				out.write("null");
michael@0: 			else
michael@0: 				out.write(value.toString());
michael@0: 			return;
michael@0: 		}		
michael@0: 		
michael@0: 		if(value instanceof Number){
michael@0: 			out.write(value.toString());
michael@0: 			return;
michael@0: 		}
michael@0: 		
michael@0: 		if(value instanceof Boolean){
michael@0: 			out.write(value.toString());
michael@0: 			return;
michael@0: 		}
michael@0: 		
michael@0: 		if((value instanceof JSONStreamAware)){
michael@0: 			((JSONStreamAware)value).writeJSONString(out);
michael@0: 			return;
michael@0: 		}
michael@0: 		
michael@0: 		if((value instanceof JSONAware)){
michael@0: 			out.write(((JSONAware)value).toJSONString());
michael@0: 			return;
michael@0: 		}
michael@0: 		
michael@0: 		if(value instanceof Map){
michael@0: 			JSONObject.writeJSONString((Map)value, out);
michael@0: 			return;
michael@0: 		}
michael@0: 		
michael@0: 		if(value instanceof List){
michael@0: 			JSONArray.writeJSONString((List)value, out);
michael@0:             return;
michael@0: 		}
michael@0: 		
michael@0: 		out.write(value.toString());
michael@0: 	}
michael@0: 
michael@0: 	/**
michael@0: 	 * Convert an object to JSON text.
michael@0: 	 * <p>
michael@0: 	 * If this object is a Map or a List, and it's also a JSONAware, JSONAware will be considered firstly.
michael@0: 	 * <p>
michael@0: 	 * DO NOT call this method from toJSONString() of a class that implements both JSONAware and Map or List with 
michael@0: 	 * "this" as the parameter, use JSONObject.toJSONString(Map) or JSONArray.toJSONString(List) instead. 
michael@0: 	 * 
michael@0: 	 * @see org.json.simple.JSONObject#toJSONString(Map)
michael@0: 	 * @see org.json.simple.JSONArray#toJSONString(List)
michael@0: 	 * 
michael@0: 	 * @param value
michael@0: 	 * @return JSON text, or "null" if value is null or it's an NaN or an INF number.
michael@0: 	 */
michael@0: 	public static String toJSONString(Object value){
michael@0: 		if(value == null)
michael@0: 			return "null";
michael@0: 		
michael@0: 		if(value instanceof String)
michael@0: 			return "\""+escape((String)value)+"\"";
michael@0: 		
michael@0: 		if(value instanceof Double){
michael@0: 			if(((Double)value).isInfinite() || ((Double)value).isNaN())
michael@0: 				return "null";
michael@0: 			else
michael@0: 				return value.toString();
michael@0: 		}
michael@0: 		
michael@0: 		if(value instanceof Float){
michael@0: 			if(((Float)value).isInfinite() || ((Float)value).isNaN())
michael@0: 				return "null";
michael@0: 			else
michael@0: 				return value.toString();
michael@0: 		}		
michael@0: 		
michael@0: 		if(value instanceof Number)
michael@0: 			return value.toString();
michael@0: 		
michael@0: 		if(value instanceof Boolean)
michael@0: 			return value.toString();
michael@0: 		
michael@0: 		if((value instanceof JSONAware))
michael@0: 			return ((JSONAware)value).toJSONString();
michael@0: 		
michael@0: 		if(value instanceof Map)
michael@0: 			return JSONObject.toJSONString((Map)value);
michael@0: 		
michael@0: 		if(value instanceof List)
michael@0: 			return JSONArray.toJSONString((List)value);
michael@0: 		
michael@0: 		return value.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: 	 * @param s
michael@0: 	 * @return
michael@0: 	 */
michael@0: 	public static String escape(String s){
michael@0: 		if(s==null)
michael@0: 			return null;
michael@0:         StringBuffer sb = new StringBuffer();
michael@0:         escape(s, sb);
michael@0:         return sb.toString();
michael@0:     }
michael@0: 
michael@0:     /**
michael@0:      * @param s - Must not be null.
michael@0:      * @param sb
michael@0:      */
michael@0:     static void escape(String s, StringBuffer sb) {
michael@0: 		for(int i=0;i<s.length();i++){
michael@0: 			char ch=s.charAt(i);
michael@0: 			switch(ch){
michael@0: 			case '"':
michael@0: 				sb.append("\\\"");
michael@0: 				break;
michael@0: 			case '\\':
michael@0: 				sb.append("\\\\");
michael@0: 				break;
michael@0: 			case '\b':
michael@0: 				sb.append("\\b");
michael@0: 				break;
michael@0: 			case '\f':
michael@0: 				sb.append("\\f");
michael@0: 				break;
michael@0: 			case '\n':
michael@0: 				sb.append("\\n");
michael@0: 				break;
michael@0: 			case '\r':
michael@0: 				sb.append("\\r");
michael@0: 				break;
michael@0: 			case '\t':
michael@0: 				sb.append("\\t");
michael@0: 				break;
michael@0: 			case '/':
michael@0: 				sb.append("\\/");
michael@0: 				break;
michael@0: 			default:
michael@0:                 //Reference: http://www.unicode.org/versions/Unicode5.1.0/
michael@0: 				if((ch>='\u0000' && ch<='\u001F') || (ch>='\u007F' && ch<='\u009F') || (ch>='\u2000' && ch<='\u20FF')){
michael@0: 					String ss=Integer.toHexString(ch);
michael@0: 					sb.append("\\u");
michael@0: 					for(int k=0;k<4-ss.length();k++){
michael@0: 						sb.append('0');
michael@0: 					}
michael@0: 					sb.append(ss.toUpperCase());
michael@0: 				}
michael@0: 				else{
michael@0: 					sb.append(ch);
michael@0: 				}
michael@0: 			}
michael@0: 		}//for
michael@0: 	}
michael@0: 
michael@0: }