001package org.hl7.fhir.utilities.json;
002
003import java.io.IOException;
004import java.net.URL;
005import java.time.Instant;
006import java.time.OffsetDateTime;
007import java.util.ArrayList;
008import java.util.Calendar;
009import java.util.List;
010import java.util.Map.Entry;
011
012import org.hl7.fhir.utilities.TextFile;
013import org.hl7.fhir.utilities.Utilities;
014
015/*
016  Copyright (c) 2011+, HL7, Inc.
017  All rights reserved.
018  
019  Redistribution and use in source and binary forms, with or without modification, 
020  are permitted provided that the following conditions are met:
021    
022   * Redistributions of source code must retain the above copyright notice, this 
023     list of conditions and the following disclaimer.
024   * Redistributions in binary form must reproduce the above copyright notice, 
025     this list of conditions and the following disclaimer in the documentation 
026     and/or other materials provided with the distribution.
027   * Neither the name of HL7 nor the names of its contributors may be used to 
028     endorse or promote products derived from this software without specific 
029     prior written permission.
030  
031  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 
032  ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
033  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 
034  IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 
035  INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 
036  NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 
037  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
038  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
039  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
040  POSSIBILITY OF SUCH DAMAGE.
041  
042 */
043
044
045
046import com.google.gson.JsonArray;
047import com.google.gson.JsonElement;
048import com.google.gson.JsonNull;
049import com.google.gson.JsonObject;
050import com.google.gson.JsonPrimitive;
051
052public class JsonUtilities {
053
054  public static JsonObject parse(String json) throws IOException {
055    return JsonTrackingParser.parseJson(json);    
056    
057  }
058
059  public static JsonObject forceObject(JsonObject obj, String name) {
060    if (obj.has(name) && obj.get(name).isJsonObject())
061      return obj.getAsJsonObject(name);
062    if (obj.has(name))
063      obj.remove(name);
064    JsonObject res = new JsonObject();
065    obj.add(name, res);
066    return res;
067  }
068
069  public static JsonArray forceArray(JsonObject obj, String name) {
070    if (obj.has(name) && obj.get(name).isJsonArray())
071      return obj.getAsJsonArray(name);
072    if (obj.has(name))
073      obj.remove(name);
074    JsonArray res = new JsonArray();
075    obj.add(name, res);
076    return res;  }
077
078  public static JsonObject addObj(JsonArray arr) {
079    JsonObject res = new JsonObject();
080    arr.add(res);
081    return res;
082  }
083
084  public static JsonObject findByStringProp(JsonArray arr, String prop, String value) {
085    for (JsonElement e : arr) {
086      JsonObject obj = (JsonObject) e;
087      if (obj.has(prop) && obj.get(prop).getAsString().equals(value)) 
088        return obj;
089    }
090    return null;
091  }
092
093  public static String str(JsonObject json, String name) {
094    JsonElement e = json.get(name);
095    return e == null || e instanceof JsonNull ? null : e.getAsString();
096  }
097
098  public static boolean bool(JsonObject json, String name) {
099    JsonElement e = json.get(name);
100    return e == null || e instanceof JsonNull ? false : e.getAsBoolean();
101  }
102
103  public static String str(JsonObject json, String name1, String name2) {
104    JsonElement e = json.get(name1);
105    if (e == null)
106      e = json.get(name2);
107    return e == null ? null : e instanceof JsonNull ? null :  e.getAsString();
108  }
109
110  public static boolean has(JsonObject json, String name1, String name2) {
111    return json.has(name1) || json.has(name2);
112  }
113
114  public static List<JsonObject> objects(JsonObject json, String name) {
115    List<JsonObject> res = new ArrayList<>();
116    if (json.has(name))
117      for (JsonElement e : json.getAsJsonArray(name))
118        if (e instanceof JsonObject)
119          res.add((JsonObject) e);
120    return res;
121  }
122
123  public static void merge(JsonObject source, JsonObject target) {
124    for (Entry<String, JsonElement> pp : source.entrySet()) {
125      if (target.has(pp.getKey())) {
126        JsonElement te = target.get(pp.getKey());
127        if (te.isJsonObject() && pp.getValue().isJsonObject()) {
128          merge(te.getAsJsonObject(), pp.getValue().getAsJsonObject());
129        } else {
130          target.remove(pp.getKey());
131          target.add(pp.getKey(), pp.getValue());
132        }
133      } else {
134        target.add(pp.getKey(), pp.getValue());
135      }
136    }
137  }
138
139  public static String type(JsonElement e) {
140    if (e == null) {
141      return "(null)";
142    }
143    if (e.isJsonObject()) {
144      return "Object";
145    }
146    if (e.isJsonArray()) {
147      return "Array";
148    }
149    if (e.isJsonNull()) {
150      return "Null";
151    }
152    JsonPrimitive p = (JsonPrimitive) e;
153    if (p.isBoolean()) {
154      return "Boolean";
155    }
156    if (p.isNumber()) {
157      return "Number";
158    }
159    return "String";
160  }
161
162  public static List<String> strings(JsonArray arr) {
163    List<String> res = new ArrayList<String>();
164    for (int i = 0; i < arr.size(); i++) {
165      JsonElement n = arr.get(i);
166      if (n.isJsonPrimitive()) {
167        res.add(n.getAsString());
168      }
169    }
170    return res;
171  }
172
173  public static Instant parseDate(JsonObject obj, String name) {
174    String source = str(obj, name);
175    if (Utilities.noString(source)) {
176      return null;
177    } else {
178      OffsetDateTime odt = OffsetDateTime.parse( source );
179      return odt.toInstant();
180    }
181  }
182
183  public static void setProperty(JsonObject json, String name, String value) {
184    json.addProperty(name, value);    
185  }
186}