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    /*
 * $Id: JSONValue.java,v 1.1 2006/04/15 14:37:04 platform Exp $
 * Created on 2006-4-15
 */
package org.zbus.json;

import java.io.IOException;
import java.io.Reader; 
import java.io.StringWriter;
import java.io.Writer;
import java.util.Collection; 
import java.util.Map;

import org.zbus.json.parser.JSONParser;
import org.zbus.json.parser.ParseException;
 
 
public class JSONValue {
	 
	 
	/**
	 * Parse JSON text into java object from the input source.
	 * 
	 * @see org.zbus.json.parser.simple.parser.JSONParser
	 * 
	 * @param in
	 * @return Instance of the following:
	 * 	org.json.simple.JSONObject,
	 * 	org.json.simple.JSONArray,
	 * 	java.lang.String,
	 * 	java.lang.Number,
	 * 	java.lang.Boolean,
	 * 	null
	 * 
	 * @throws IOException
	 * @throws ParseException
	 */
	public static Object parseWithException(Reader in) throws IOException, ParseException{
		JSONParser parser=new JSONParser();
		return parser.parse(in);
	}
	
	public static Object parseWithException(String s) throws ParseException{
		JSONParser parser=new JSONParser();
		return parser.parse(s);
	}
	
    /**
     * Encode an object into JSON text and write it to out.
     * 
    
     * 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.
     * 
    
     * DO NOT call this method from writeJSONString(Writer) of a class that implements both JSONStreamAware and (Map or List) with 
     * "this" as the first parameter, use JSONObject.writeJSONString(Map, Writer) or JSONArray.writeJSONString(List, Writer) instead. 
     * 
     * @see org.zbus.json.simple.JSONObject#writeJSONString(Map, Writer)
     * @see org.zbus.json.simple.JSONArray#writeJSONString(List, Writer)
     * 
     * @param value
     * @param writer
     */
	@SuppressWarnings("unchecked")
	public static void writeJSONString(Object value, Writer out) throws IOException {
		if(value == null){
			out.write("null");
			return;
		}
		
		if(value instanceof String){		
            out.write('\"');
			out.write(escape((String)value));
            out.write('\"');
			return;
		}
		
		if(value instanceof Double){
			if(((Double)value).isInfinite() || ((Double)value).isNaN())
				out.write("null");
			else
				out.write(value.toString());
			return;
		}
		
		if(value instanceof Float){
			if(((Float)value).isInfinite() || ((Float)value).isNaN())
				out.write("null");
			else
				out.write(value.toString());
			return;
		}		
		
		if(value instanceof Number){
			out.write(value.toString());
			return;
		}
		
		if(value instanceof Boolean){
			out.write(value.toString());
			return;
		}
		
		if((value instanceof JSONStreamAware)){
			((JSONStreamAware)value).writeJSONString(out);
			return;
		}
		
		if((value instanceof JSONAware)){
			out.write(((JSONAware)value).toJSONString());
			return;
		}
		
		if(value instanceof Map){
			JSONObject.writeJSONString((Map)value, out);
			return;
		}
		
		if(value instanceof Collection){
			JSONArray.writeJSONString((Collection)value, out);
            return;
		}
		
		if(value instanceof byte[]){
			JSONArray.writeJSONString((byte[])value, out);
			return;
		}
		
		if(value instanceof short[]){
			JSONArray.writeJSONString((short[])value, out);
			return;
		}
		
		if(value instanceof int[]){
			JSONArray.writeJSONString((int[])value, out);
			return;
		}
		
		if(value instanceof long[]){
			JSONArray.writeJSONString((long[])value, out);
			return;
		}
		
		if(value instanceof float[]){
			JSONArray.writeJSONString((float[])value, out);
			return;
		}
		
		if(value instanceof double[]){
			JSONArray.writeJSONString((double[])value, out);
			return;
		}
		
		if(value instanceof boolean[]){
			JSONArray.writeJSONString((boolean[])value, out);
			return;
		}
		
		if(value instanceof char[]){
			JSONArray.writeJSONString((char[])value, out);
			return;
		}
		
		if(value instanceof Object[]){
			JSONArray.writeJSONString((Object[])value, out);
			return;
		}
		
		out.write(value.toString());
	}

	/**
	 * Convert an object to JSON text.
	 * 
    
	 * If this object is a Map or a List, and it's also a JSONAware, JSONAware will be considered firstly.
	 * 
    
	 * DO NOT call this method from toJSONString() of a class that implements both JSONAware and Map or List with 
	 * "this" as the parameter, use JSONObject.toJSONString(Map) or JSONArray.toJSONString(List) instead. 
	 * 
	 * @see org.zbus.json.simple.JSONObject#toJSONString(Map)
	 * @see org.zbus.json.simple.JSONArray#toJSONString(List)
	 * 
	 * @param value
	 * @return JSON text, or "null" if value is null or it's an NaN or an INF number.
	 */
	public static String toJSONString(Object value){
		final StringWriter writer = new StringWriter();
		
		try{
			writeJSONString(value, writer);
			return writer.toString();
		} catch(IOException e){
			// This should never happen for a StringWriter
			throw new RuntimeException(e);
		}
	}

	/**
	 * Escape quotes, \, /, \r, \n, \b, \f, \t and other control characters (U+0000 through U+001F).
	 * @param s
	 * @return
	 */
	public static String escape(String s){
		if(s==null)
			return null;
        StringBuffer sb = new StringBuffer();
        escape(s, sb);
        return sb.toString();
    }

    /**
     * @param s - Must not be null.
     * @param sb
     */
    static void escape(String s, StringBuffer sb) {
    	final int len = s.length();
		for(int i=0;i='\u0000' && ch<='\u001F') || (ch>='\u007F' && ch<='\u009F') || (ch>='\u2000' && ch<='\u20FF')){
					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
	}

}
    
    
    
    

    




    
    
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