/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.chemistry.opencmis.commons.impl.json;
import java.io.IOException;
import java.io.Reader;
import java.io.StringReader;
import java.io.Writer;
import java.math.BigDecimal;
import java.util.List;
import java.util.Map;
import org.apache.chemistry.opencmis.commons.impl.json.parser.JSONParseException;
import org.apache.chemistry.opencmis.commons.impl.json.parser.JSONParser;
/**
* (Taken from JSON.simple <http://code.google.com/p/json-simple/> and modified
* for OpenCMIS.)
*
* @author FangYidong<fangyidong@yahoo.com.cn>
*/
public final class JSONValue {
private JSONValue() {
}
/**
* Parse JSON text into java object from the input source. Please use
* parseWithException() if you don't want to ignore the exception.
*
* @see org.json.simple.parser.JSONParser#parse(Reader)
* @see #parseWithException(Reader)
*
* @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
*
*/
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.
*
* @see org.json.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 JSONParseException
*/
public static Object parseWithException(Reader in) throws IOException, JSONParseException {
JSONParser parser = new JSONParser();
return parser.parse(in);
}
public static Object parseWithException(String s) throws JSONParseException {
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.
*
* @see org.json.simple.JSONObject#writeJSONString(Map, Writer)
* @see org.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 BigDecimal) {
out.write(((BigDecimal) value).toPlainString());
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<String, Object>) value, out);
return;
}
if (value instanceof List) {
JSONArray.writeJSONString((List<Object>) 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.
*
* @see org.json.simple.JSONObject#toJSONString(Map)
* @see org.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.
*/
@SuppressWarnings("unchecked")
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 BigDecimal) {
return ((BigDecimal) value).toPlainString();
}
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<String, Object>) value);
}
if (value instanceof List) {
return JSONArray.toJSONString((List<Object>) 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;
}
StringBuilder sb = new StringBuilder();
escape(s, sb);
return sb.toString();
}
/**
* @param s
* - Must not be null.
* @param sb
*/
static void escape(String s, StringBuilder 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
}
}