001package org.hl7.fhir.r4.formats; 002 003/* 004 Copyright (c) 2011+, HL7, Inc. 005 All rights reserved. 006 007 Redistribution and use in source and binary forms, with or without modification, 008 are permitted provided that the following conditions are met: 009 010 * Redistributions of source code must retain the above copyright notice, this 011 list of conditions and the following disclaimer. 012 * Redistributions in binary form must reproduce the above copyright notice, 013 this list of conditions and the following disclaimer in the documentation 014 and/or other materials provided with the distribution. 015 * Neither the name of HL7 nor the names of its contributors may be used to 016 endorse or promote products derived from this software without specific 017 prior written permission. 018 019 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 020 ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 021 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 022 IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 023 INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 024 NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 025 PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 026 WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 027 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 028 POSSIBILITY OF SUCH DAMAGE. 029 030 */ 031 032import java.io.IOException; 033import java.io.OutputStreamWriter; 034import java.math.BigDecimal; 035import java.util.ArrayList; 036import java.util.Collections; 037import java.util.List; 038import java.util.Stack; 039 040public class JsonCreatorCanonical implements JsonCreator { 041 042 public class JsonCanValue { 043 String name; 044 045 private JsonCanValue(String name) { 046 this.name = name; 047 } 048 } 049 050 private class JsonCanNumberValue extends JsonCanValue { 051 private BigDecimal value; 052 053 private JsonCanNumberValue(String name, BigDecimal value) { 054 super(name); 055 this.value = value; 056 } 057 } 058 059 private class JsonCanPresentedNumberValue extends JsonCanValue { 060 private String value; 061 062 private JsonCanPresentedNumberValue(String name, String value) { 063 super(name); 064 this.value = value; 065 } 066 } 067 068 private class JsonCanIntegerValue extends JsonCanValue { 069 private Integer value; 070 071 private JsonCanIntegerValue(String name, Integer value) { 072 super(name); 073 this.value = value; 074 } 075 } 076 077 private class JsonCanBooleanValue extends JsonCanValue { 078 private Boolean value; 079 080 private JsonCanBooleanValue(String name, Boolean value) { 081 super(name); 082 this.value = value; 083 } 084 } 085 086 private class JsonCanStringValue extends JsonCanValue { 087 private String value; 088 089 private JsonCanStringValue(String name, String value) { 090 super(name); 091 this.value = value; 092 } 093 } 094 095 private class JsonCanNullValue extends JsonCanValue { 096 private JsonCanNullValue(String name) { 097 super(name); 098 } 099 } 100 101 public class JsonCanObject extends JsonCanValue { 102 103 boolean array; 104 List<JsonCanValue> children = new ArrayList<JsonCanValue>(); 105 106 public JsonCanObject(String name, boolean array) { 107 super(name); 108 this.array = array; 109 } 110 111 public void addProp(JsonCanValue obj) { 112 children.add(obj); 113 } 114 } 115 116 Stack<JsonCanObject> stack; 117 JsonCanObject root; 118 JsonCreatorDirect jj; 119 String name; 120 121 public JsonCreatorCanonical(OutputStreamWriter osw) { 122 stack = new Stack<JsonCreatorCanonical.JsonCanObject>(); 123 jj = new JsonCreatorDirect(osw); 124 name = null; 125 } 126 127 private String takeName() { 128 String res = name; 129 name = null; 130 return res; 131 } 132 133 @Override 134 public void setIndent(String indent) { 135 if (!indent.equals("")) 136 throw new Error("do not use pretty when canonical is set"); 137 jj.setIndent(indent); 138 } 139 140 @Override 141 public void beginObject() throws IOException { 142 JsonCanObject obj = new JsonCanObject(takeName(), false); 143 if (stack.isEmpty()) 144 root = obj; 145 else 146 stack.peek().addProp(obj); 147 stack.push(obj); 148 } 149 150 @Override 151 public void endObject() throws IOException { 152 stack.pop(); 153 } 154 155 @Override 156 public void nullValue() throws IOException { 157 stack.peek().addProp(new JsonCanNullValue(takeName())); 158 } 159 160 @Override 161 public void name(String name) throws IOException { 162 this.name = name; 163 } 164 165 @Override 166 public void value(String value) throws IOException { 167 stack.peek().addProp(new JsonCanStringValue(takeName(), value)); 168 } 169 170 @Override 171 public void value(Boolean value) throws IOException { 172 stack.peek().addProp(new JsonCanBooleanValue(takeName(), value)); 173 } 174 175 @Override 176 public void value(BigDecimal value) throws IOException { 177 stack.peek().addProp(new JsonCanNumberValue(takeName(), value)); 178 } 179 180 @Override 181 public void valueNum(String value) throws IOException { 182 stack.peek().addProp(new JsonCanPresentedNumberValue(takeName(), value)); 183 } 184 185 @Override 186 public void value(Integer value) throws IOException { 187 stack.peek().addProp(new JsonCanIntegerValue(takeName(), value)); 188 } 189 190 @Override 191 public void beginArray() throws IOException { 192 JsonCanObject obj = new JsonCanObject(takeName(), true); 193 if (!stack.isEmpty()) 194 stack.peek().addProp(obj); 195 stack.push(obj); 196 197 } 198 199 @Override 200 public void endArray() throws IOException { 201 stack.pop(); 202 } 203 204 @Override 205 public void finish() throws IOException { 206 writeObject(root); 207 } 208 209 private void writeObject(JsonCanObject obj) throws IOException { 210 jj.beginObject(); 211 List<String> names = new ArrayList<String>(); 212 for (JsonCanValue v : obj.children) 213 names.add(v.name); 214 Collections.sort(names); 215 for (String n : names) { 216 jj.name(n); 217 JsonCanValue v = getPropForName(n, obj.children); 218 if (v instanceof JsonCanNumberValue) 219 jj.value(((JsonCanNumberValue) v).value); 220 else if (v instanceof JsonCanPresentedNumberValue) 221 jj.valueNum(((JsonCanPresentedNumberValue) v).value); 222 else if (v instanceof JsonCanIntegerValue) 223 jj.value(((JsonCanIntegerValue) v).value); 224 else if (v instanceof JsonCanBooleanValue) 225 jj.value(((JsonCanBooleanValue) v).value); 226 else if (v instanceof JsonCanStringValue) 227 jj.value(((JsonCanStringValue) v).value); 228 else if (v instanceof JsonCanNullValue) 229 jj.nullValue(); 230 else if (v instanceof JsonCanObject) { 231 JsonCanObject o = (JsonCanObject) v; 232 if (o.array) 233 writeArray(o); 234 else 235 writeObject(o); 236 } else 237 throw new Error("not possible"); 238 } 239 jj.endObject(); 240 } 241 242 private JsonCanValue getPropForName(String name, List<JsonCanValue> children) { 243 for (JsonCanValue child : children) 244 if (child.name.equals(name)) 245 return child; 246 return null; 247 } 248 249 private void writeArray(JsonCanObject arr) throws IOException { 250 jj.beginArray(); 251 for (JsonCanValue v : arr.children) { 252 if (v instanceof JsonCanNumberValue) 253 jj.value(((JsonCanNumberValue) v).value); 254 else if (v instanceof JsonCanIntegerValue) 255 jj.value(((JsonCanIntegerValue) v).value); 256 else if (v instanceof JsonCanBooleanValue) 257 jj.value(((JsonCanBooleanValue) v).value); 258 else if (v instanceof JsonCanStringValue) 259 jj.value(((JsonCanStringValue) v).value); 260 else if (v instanceof JsonCanNullValue) 261 jj.nullValue(); 262 else if (v instanceof JsonCanObject) { 263 JsonCanObject o = (JsonCanObject) v; 264 if (o.array) 265 writeArray(o); 266 else 267 writeObject(o); 268 } else 269 throw new Error("not possible"); 270 } 271 jj.endArray(); 272 } 273 274 @Override 275 public void link(String href) { 276 // not used 277 } 278 279}