JSONObject.java

  1. package org.drip.json.simple;

  3. /*
  4.  * -*- mode: java; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
  5.  */

  7. /*!
  8.  * Copyright (C) 2020 Lakshmi Krishnamurthy
  9.  * Copyright (C) 2019 Lakshmi Krishnamurthy
  10.  * Copyright (C) 2018 Lakshmi Krishnamurthy
  11.  * Copyright (C) 2017 Lakshmi Krishnamurthy
  12.  * Copyright (C) 2016 Lakshmi Krishnamurthy
  13.  * Copyright (C) 2015 Lakshmi Krishnamurthy
  14.  * 
  15.  *  This file is part of DROP, an open-source library targeting analytics/risk, transaction cost analytics,
  16.  *      asset liability management analytics, capital, exposure, and margin analytics, valuation adjustment
  17.  *      analytics, and portfolio construction analytics within and across fixed income, credit, commodity,
  18.  *      equity, FX, and structured products. It also includes auxiliary libraries for algorithm support,
  19.  *      numerical analysis, numerical optimization, spline builder, model validation, statistical learning,
  20.  *      and computational support.
  21.  *  
  22.  *      https://lakshmidrip.github.io/DROP/
  23.  *  
  24.  *  DROP is composed of three modules:
  25.  *  
  26.  *  - DROP Product Core - https://lakshmidrip.github.io/DROP-Product-Core/
  27.  *  - DROP Portfolio Core - https://lakshmidrip.github.io/DROP-Portfolio-Core/
  28.  *  - DROP Computational Core - https://lakshmidrip.github.io/DROP-Computational-Core/
  29.  * 
  30.  *  DROP Product Core implements libraries for the following:
  31.  *  - Fixed Income Analytics
  32.  *  - Loan Analytics
  33.  *  - Transaction Cost Analytics
  34.  * 
  35.  *  DROP Portfolio Core implements libraries for the following:
  36.  *  - Asset Allocation Analytics
  37.  *  - Asset Liability Management Analytics
  38.  *  - Capital Estimation Analytics
  39.  *  - Exposure Analytics
  40.  *  - Margin Analytics
  41.  *  - XVA Analytics
  42.  * 
  43.  *  DROP Computational Core implements libraries for the following:
  44.  *  - Algorithm Support
  45.  *  - Computation Support
  46.  *  - Function Analysis
  47.  *  - Model Validation
  48.  *  - Numerical Analysis
  49.  *  - Numerical Optimizer
  50.  *  - Spline Builder
  51.  *  - Statistical Learning
  52.  * 
  53.  *  Documentation for DROP is Spread Over:
  54.  * 
  55.  *  - Main                     => https://lakshmidrip.github.io/DROP/
  56.  *  - Wiki                     => https://github.com/lakshmiDRIP/DROP/wiki
  57.  *  - GitHub                   => https://github.com/lakshmiDRIP/DROP
  58.  *  - Repo Layout Taxonomy     => https://github.com/lakshmiDRIP/DROP/blob/master/Taxonomy.md
  59.  *  - Javadoc                  => https://lakshmidrip.github.io/DROP/Javadoc/index.html
  60.  *  - Technical Specifications => https://github.com/lakshmiDRIP/DROP/tree/master/Docs/Internal
  61.  *  - Release Versions         => https://lakshmidrip.github.io/DROP/version.html
  62.  *  - Community Credits        => https://lakshmidrip.github.io/DROP/credits.html
  63.  *  - Issues Catalog           => https://github.com/lakshmiDRIP/DROP/issues
  64.  *  - JUnit                    => https://lakshmidrip.github.io/DROP/junit/index.html
  65.  *  - Jacoco                   => https://lakshmidrip.github.io/DROP/jacoco/index.html
  66.  * 
  67.  *  Licensed under the Apache License, Version 2.0 (the "License");
  68.  *      you may not use this file except in compliance with the License.
  69.  *   
  70.  *  You may obtain a copy of the License at
  71.  *      http://www.apache.org/licenses/LICENSE-2.0
  72.  *  
  73.  *  Unless required by applicable law or agreed to in writing, software
  74.  *      distributed under the License is distributed on an "AS IS" BASIS,
  75.  *      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  76.  *  
  77.  *  See the License for the specific language governing permissions and
  78.  *      limitations under the License.
  79.  */

  81. /**
  82.  * <i>JSONObject</i> is an Adaptation of the JSONObject Class from the RFC4627 compliant JSON Simple
  83.  * (https://code.google.com/p/json-simple/).
  84.  *
  85.  *  <br><br>
  86.  *  <ul>
  87.  *      <li><b>Module </b> = <a href = "https://github.com/lakshmiDRIP/DROP/tree/master/ComputationalCore.md">Computational Core Module</a></li>
  88.  *      <li><b>Library</b> = <a href = "https://github.com/lakshmiDRIP/DROP/tree/master/ComputationSupportLibrary.md">Computation Support</a></li>
  89.  *      <li><b>Project</b> = <a href = "https://github.com/lakshmiDRIP/DROP/tree/master/src/main/java/org/drip/json">RFC-4627 Compliant JSON Encoder/Decoder (Parser)</a></li>
  90.  *      <li><b>Package</b> = <a href = "https://github.com/lakshmiDRIP/DROP/tree/master/src/main/java/org/drip/json/simple">RFC4627 Compliant JSON Message Object</a></li>
  91.  *  </ul>
  92.  * 
  93.  * @author Fang Yidong
  94.  * @author Lakshmi Krishnamurthy
  95.  */

  97. @SuppressWarnings ("rawtypes") public class JSONObject extends java.util.HashMap implements java.util.Map, JSONAware, JSONStreamAware{
  98.     
  99.     private static final long serialVersionUID = -503443796854799292L;
  100.     
  101.     
  102.     public JSONObject() {
  103.             super();
  104.     }

  106.     /**
  107.      * Allows creation of a JSONObject from a Map. After that, both the
  108.      * generated JSONObject and the Map can be modified independently.
  109.      * 
  110.      * @param map Input JSON Map
  111.      */

  113.     @SuppressWarnings ("unchecked") public JSONObject(java.util.Map map) {
  114.             super(map);
  115.     }


  118. /**
  119.  * Encode a map into JSON text and write it to out.
  120.  * If this map is also a JSONAware or JSONStreamAware, JSONAware or JSONStreamAware specific behaviours will be ignored at this top level.
  121.  * 
  122.  * @see org.drip.json.simple.JSONValue#writeJSONString(Object, Writer)
  123.  * 
  124.  * @param map Input Map
  125.  * @param out Output Writer
  126.  * 
  127.  * @throws java.io.IOException Thrown if the Inputs are Invalid
  128.  */
  129.     public static void writeJSONString(java.util.Map map, java.io.Writer out) throws java.io.IOException {
  130.             if(map == null){
  131.                     out.write("null");
  132.                     return;
  133.             }
  134.             
  135.             boolean first = true;
  136.             java.util.Iterator iter=map.entrySet().iterator();
  137.             
  138.     out.write('{');
  139.             while(iter.hasNext()){
  140.         if(first)
  141.             first = false;
  142.         else
  143.             out.write(',');
  144.         java.util.Map.Entry entry=(java.util.Map.Entry)iter.next();
  145.         out.write('\"');
  146.         out.write(escape(String.valueOf(entry.getKey())));
  147.         out.write('\"');
  148.         out.write(':');
  149.                     JSONValue.writeJSONString(entry.getValue(), out);
  150.             }
  151.             out.write('}');
  152.     }

  154.     public void writeJSONString(java.io.Writer out) throws java.io.IOException{
  155.             writeJSONString(this, out);
  156.     }
  157.     
  158.     /**
  159.      * Convert a map to JSON text. The result is a JSON object. 
  160.      * If this map is also a JSONAware, JSONAware specific behaviours will be omitted at this top level.
  161.      * 
  162.      * @see org.drip.json.simple.JSONValue#toJSONString(Object)
  163.      * 
  164.      * @param map The JSON Map
  165.      * 
  166.      * @return JSON text, or "null" if map is null.
  167.      */
  168.     public static String toJSONString(java.util.Map map){
  169.             if(map == null)
  170.                     return "null";
  171.             
  172.     StringBuffer sb = new StringBuffer();
  173.     boolean first = true;
  174.     java.util.Iterator iter=map.entrySet().iterator();
  175.             
  176.     sb.append('{');
  177.             while(iter.hasNext()){
  178.         if(first)
  179.             first = false;
  180.         else
  181.             sb.append(',');
  182.         
  183.         java.util.Map.Entry entry=(java.util.Map.Entry)iter.next();
  184.                     toJSONString(String.valueOf(entry.getKey()),entry.getValue(), sb);
  185.             }
  186.     sb.append('}');
  187.             return sb.toString();
  188.     }
  189.     
  190.     public String toJSONString(){
  191.             return toJSONString(this);
  192.     }
  193.     
  194.     private static String toJSONString(String key,Object value, StringBuffer sb){
  195.             sb.append('\"');
  196.     if(key == null)
  197.         sb.append("null");
  198.     else
  199.         JSONValue.escape(key, sb);
  200.             sb.append('\"').append(':');
  201.             
  202.             sb.append(JSONValue.toJSONString(value));
  203.             
  204.             return sb.toString();
  205.     }
  206.     
  207.     public String toString(){
  208.             return toJSONString();
  209.     }

  211.     public static String toString(String key,Object value){
  212.     StringBuffer sb = new StringBuffer();
  213.             toJSONString(key, value, sb);
  214.     return sb.toString();
  215.     }
  216.     
  217.     /**
  218.      * Escape quotes, \, /, \r, \n, \b, \f, \t and other control characters (U+0000 through U+001F).
  219.      * It's the same as JSONValue.escape() only for compatibility here.
  220.      * 
  221.      * @see org.drip.json.simple.JSONValue#escape(String)
  222.      * 
  223.      * @param s The Input String
  224.      * @return Escaped String
  225.      */
  226.     public static String escape(String s){
  227.             return JSONValue.escape(s);
  228.     }
  229. }
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