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