JSONValue.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>JSONValue</i> is an Adaptation of the JSONValue 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. public class JSONValue {
  98.     /**
  99.      * Parse JSON text into java object from the input source. 
  100.      * Please use parseWithException() if you don't want to ignore the exception.
  101.      * 
  102.      * @see org.drip.json.parser.JSONParser#parse(Reader)
  103.      * @see #parseWithException(Reader)
  104.      * 
  105.      * @param in Input Reader
  106.      * 
  107.      * @return Instance of the following:
  108.      *      org.drip.json.simple.JSONObject,
  109.      *      org.drip.json.simple.JSONArray,
  110.      *      java.lang.String,
  111.      *      java.lang.Number,
  112.      *      java.lang.Boolean,
  113.      *      null
  114.      * 
  115.      */
  116.     public static Object parse(java.io.Reader in){
  117.             try{
  118.                     org.drip.json.parser.JSONParser parser=new org.drip.json.parser.JSONParser();
  119.                     return parser.parse(in);
  120.             }
  121.             catch(Exception e){
  122.                     return null;
  123.             }
  124.     }
  125.     
  126.     public static Object parse(String s){
  127.         java.io.StringReader in=new java.io.StringReader(s);
  128.             return parse(in);
  129.     }
  130.     
  131.     /**
  132.      * Parse JSON text into java object from the input source.
  133.      * 
  134.      * @see org.drip.json.parser.JSONParser
  135.      * 
  136.      * @param in Input Reader
  137.      * @return Instance of the following:
  138.      *      org.json.simple.JSONObject,
  139.      *      org.json.simple.JSONArray,
  140.      *      java.lang.String,
  141.      *      java.lang.Number,
  142.      *      java.lang.Boolean,
  143.      *      null
  144.      * 
  145.      * @throws java.io.IOException Thrown if the Inputs are Invalid
  146.      * 
  147.      * @throws org.drip.json.parser.ParseException Thrown if the Inputs are Invalid
  148.      */
  149.     public static Object parseWithException(java.io.Reader in) throws java.io.IOException, org.drip.json.parser.ParseException{
  150.         org.drip.json.parser.JSONParser parser=new org.drip.json.parser.JSONParser();
  151.             return parser.parse(in);
  152.     }
  153.     
  154.     public static Object parseWithException(String s) throws org.drip.json.parser.ParseException{
  155.         org.drip.json.parser.JSONParser parser=new org.drip.json.parser.JSONParser();
  156.             return parser.parse(s);
  157.     }
  158.     
  159. /**
  160.  * Encode an object into JSON text and write it to out.
  161.  * <p>
  162.  * 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.
  163.  * <p>
  164.  * DO NOT call this method from writeJSONString(Writer) of a class that implements both JSONStreamAware and (Map or List) with 
  165.  * "this" as the first parameter, use JSONObject.writeJSONString(Map, Writer) or JSONArray.writeJSONString(List, Writer) instead. 
  166.  * 
  167.  * @see org.drip.json.simple.JSONObject#writeJSONString(Map, Writer)
  168.  * @see org.drip.json.simple.JSONArray#writeJSONString(List, Writer)
  169.  * 
  170.  * @param value The JSON Object
  171.  * @param out The JSON Writer
  172.  * 
  173.  * @throws java.io.IOException Thrown if the Inputs are Invalid
  174.  */
  175.     @SuppressWarnings ("rawtypes") public static void writeJSONString(Object value, java.io.Writer out) throws java.io.IOException {
  176.             if(value == null){
  177.                     out.write("null");
  178.                     return;
  179.             }
  180.             
  181.             if(value instanceof String){            
  182.         out.write('\"');
  183.                     out.write(escape((String)value));
  184.         out.write('\"');
  185.                     return;
  186.             }
  187.             
  188.             if(value instanceof Double){
  189.                     if(((Double)value).isInfinite() || ((Double)value).isNaN())
  190.                             out.write("null");
  191.                     else
  192.                             out.write(value.toString());
  193.                     return;
  194.             }
  195.             
  196.             if(value instanceof Float){
  197.                     if(((Float)value).isInfinite() || ((Float)value).isNaN())
  198.                             out.write("null");
  199.                     else
  200.                             out.write(value.toString());
  201.                     return;
  202.             }               
  203.             
  204.             if(value instanceof Number){
  205.                     out.write(value.toString());
  206.                     return;
  207.             }
  208.             
  209.             if(value instanceof Boolean){
  210.                     out.write(value.toString());
  211.                     return;
  212.             }
  213.             
  214.             if((value instanceof JSONStreamAware)){
  215.                     ((JSONStreamAware)value).writeJSONString(out);
  216.                     return;
  217.             }
  218.             
  219.             if((value instanceof JSONAware)){
  220.                     out.write(((JSONAware)value).toJSONString());
  221.                     return;
  222.             }
  223.             
  224.             if(value instanceof java.util.Map){
  225.                 org.drip.json.simple.JSONObject.writeJSONString((java.util.Map)value, out);
  226.                     return;
  227.             }
  228.             
  229.             if(value instanceof java.util.List){
  230.                     JSONArray.writeJSONString((java.util.List)value, out);
  231.         return;
  232.             }
  233.             
  234.             out.write(value.toString());
  235.     }

  237.     /**
  238.      * Convert an object to JSON text.
  239.      * <p>
  240.      * If this object is a Map or a List, and it's also a JSONAware, JSONAware will be considered firstly.
  241.      * <p>
  242.      * DO NOT call this method from toJSONString() of a class that implements both JSONAware and Map or List with 
  243.      * "this" as the parameter, use JSONObject.toJSONString(Map) or JSONArray.toJSONString(List) instead. 
  244.      * 
  245.      * @see org.drip.json.simple.JSONObject#toJSONString(Map)
  246.      * @see org.drip.json.simple.JSONArray#toJSONString(List)
  247.      * 
  248.      * @param value The JSON Object
  249.      * 
  250.      * @return JSON text, or "null" if value is null or it's an NaN or an INF number.
  251.      */

  253.     @SuppressWarnings ("rawtypes") public static String toJSONString(Object value){
  254.             if(value == null)
  255.                     return "null";
  256.             
  257.             if(value instanceof String)
  258.                     return "\""+escape((String)value)+"\"";
  259.             
  260.             if(value instanceof Double){
  261.                     if(((Double)value).isInfinite() || ((Double)value).isNaN())
  262.                             return "null";
  263.                     else
  264.                             return value.toString();
  265.             }
  266.             
  267.             if(value instanceof Float){
  268.                     if(((Float)value).isInfinite() || ((Float)value).isNaN())
  269.                             return "null";
  270.                     else
  271.                             return value.toString();
  272.             }               
  273.             
  274.             if(value instanceof Number)
  275.                     return value.toString();
  276.             
  277.             if(value instanceof Boolean)
  278.                     return value.toString();
  279.             
  280.             if((value instanceof JSONAware))
  281.                     return ((JSONAware)value).toJSONString();
  282.             
  283.             if(value instanceof java.util.Map)
  284.                     return org.drip.json.simple.JSONObject.toJSONString((java.util.Map)value);
  285.             
  286.             if(value instanceof java.util.List)
  287.                     return org.drip.json.simple.JSONArray.toJSONString((java.util.List)value);
  288.             
  289.             return value.toString();
  290.     }

  292.     /**
  293.      * Escape quotes, \, /, \r, \n, \b, \f, \t and other control characters (U+0000 through U+001F).
  294.      * 
  295.      * @param s Pre-escape String
  296.      * 
  297.      * @return The Escape String
  298.      */
  299.     public static String escape(String s){
  300.             if(s==null)
  301.                     return null;
  302.     StringBuffer sb = new StringBuffer();
  303.     escape(s, sb);
  304.     return sb.toString();
  305. }

  307. /**
  308.  * @param s - Must not be null.
  309.  * @param sb The StringBuffer
  310.  */
  311. static void escape(String s, StringBuffer sb) {
  312.             for(int i=0;i<s.length();i++){
  313.                     char ch=s.charAt(i);
  314.                     switch(ch){
  315.                     case '"':
  316.                             sb.append("\\\"");
  317.                             break;
  318.                     case '\\':
  319.                             sb.append("\\\\");
  320.                             break;
  321.                     case '\b':
  322.                             sb.append("\\b");
  323.                             break;
  324.                     case '\f':
  325.                             sb.append("\\f");
  326.                             break;
  327.                     case '\n':
  328.                             sb.append("\\n");
  329.                             break;
  330.                     case '\r':
  331.                             sb.append("\\r");
  332.                             break;
  333.                     case '\t':
  334.                             sb.append("\\t");
  335.                             break;
  336.                     case '/':
  337.                             sb.append("\\/");
  338.                             break;
  339.                     default:
  340.             //Reference: http://www.unicode.org/versions/Unicode5.1.0/
  341.                             if((ch>='\u0000' && ch<='\u001F') || (ch>='\u007F' && ch<='\u009F') || (ch>='\u2000' && ch<='\u20FF')){
  342.                                     String ss=Integer.toHexString(ch);
  343.                                     sb.append("\\u");
  344.                                     for(int k=0;k<4-ss.length();k++){
  345.                                             sb.append('0');
  346.                                     }
  347.                                     sb.append(ss.toUpperCase());
  348.                             }
  349.                             else{
  350.                                     sb.append(ch);
  351.                             }
  352.                     }
  353.             }//for
  354.     }
  355. }
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