content: /*
   * 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 &lt;http://code.google.com/p/json-simple/&gt; and
   * modified for OpenCMIS.)
   * 
   * @author FangYidong&lt;fangyidong@yahoo.com.cn&gt;
   */
  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.apache.chemistry.opencmis.commons.impl.json.parser.JSONParser#parse(Reader)
       * @see #parseWithException(Reader)
       * 
       * @param in
       * @return Instance of the following: JSONObject, 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.apache.chemistry.opencmis.commons.impl.json.parser.JSONParser
       * 
       * @param in
       * @return Instance of the following: JSONObject, JSONArray,
       *         java.lang.String, java.lang.Number, java.lang.Boolean, null
       */
      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.apache.chemistry.opencmis.commons.impl.json.JSONObject#writeJSONString(Map,
       *      Writer)
       * @see org.apache.chemistry.opencmis.commons.impl.json.JSONArray#writeJSONString(List,
       *      Writer)
       * 
       * @param value
       * @param out
       */
      @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());
      }
  
      /**
       * Converts 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.apache.chemistry.opencmis.commons.impl.json.JSONObject#toJSONString(Map)
       * @see org.apache.chemistry.opencmis.commons.impl.json.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) {
          StringBuilder sb = new StringBuilder(1024);
          addJSONString(value, sb);
          return sb.toString();
      }
  
      /**
       * Converts an object to JSON text and attach it the the given
       * StringBuilder.
       * 
       * @see #toJSONString(Object)
       */
      @SuppressWarnings("unchecked")
      public static void addJSONString(Object value, StringBuilder sb) {
          if (value == null) {
              sb.append("null");
              return;
          }
  
          if (value instanceof String) {
              sb.append('\"');
              escape((String) value, sb);
              sb.append('\"');
              return;
          }
  
          if (value instanceof Double) {
              if (((Double) value).isInfinite() || ((Double) value).isNaN()) {
                  sb.append("null");
              } else {
                  sb.append(value.toString());
              }
              return;
          }
  
          if (value instanceof Float) {
              if (((Float) value).isInfinite() || ((Float) value).isNaN()) {
                  sb.append("null");
              } else {
                  sb.append(value.toString());
              }
              return;
          }
  
          if (value instanceof BigDecimal) {
              sb.append(((BigDecimal) value).toPlainString());
              return;
          }
  
          if (value instanceof Number) {
              sb.append(value.toString());
              return;
          }
  
          if (value instanceof Boolean) {
              sb.append(value.toString());
              return;
          }
  
          if (value instanceof JSONAware) {
              sb.append(((JSONAware) value).toJSONString());
              return;
          }
  
          if (value instanceof Map) {
              JSONObject.addJSONString((Map<String, Object>) value, sb);
              return;
          }
  
          if (value instanceof List) {
              JSONArray.addJSONString((List<Object>) value, sb);
              return;
          }
  
          sb.append(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(s.length() + 16);
          escape(s, sb);
          return sb.toString();
      }
  
      /**
       * @param s
       *            - Must not be null.
       * @param sb
       */
      static void escape(String s, StringBuilder sb) {
          final int n = s.length();
          for (int i = 0; i < n; 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
      }
  }
  