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| 1 | +/* |
| 2 | + * Licensed to Elasticsearch under one or more contributor |
| 3 | + * license agreements. See the NOTICE file distributed with |
| 4 | + * this work for additional information regarding copyright |
| 5 | + * ownership. Elasticsearch licenses this file to you under |
| 6 | + * the Apache License, Version 2.0 (the "License"); you may |
| 7 | + * not use this file except in compliance with the License. |
| 8 | + * You may obtain a copy of the License at |
| 9 | + * |
| 10 | + * http://www.apache.org/licenses/LICENSE-2.0 |
| 11 | + * |
| 12 | + * Unless required by applicable law or agreed to in writing, |
| 13 | + * software distributed under the License is distributed on an |
| 14 | + * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| 15 | + * KIND, either express or implied. See the License for the |
| 16 | + * specific language governing permissions and limitations |
| 17 | + * under the License. |
| 18 | + */ |
| 19 | + |
| 20 | +package org.elasticsearch.common.xcontent; |
| 21 | + |
| 22 | +import java.io.IOException; |
| 23 | +import java.nio.CharBuffer; |
| 24 | +import java.util.List; |
| 25 | +import java.util.Map; |
| 26 | + |
| 27 | +/** |
| 28 | + * Wrapper for a XContentParser that makes a single object to look like a complete document. |
| 29 | + * |
| 30 | + * The wrapper prevents the parsing logic to consume tokens outside of the wrapped object as well |
| 31 | + * as skipping to the end of the object in case of a parsing error. The wrapper is intended to be |
| 32 | + * used for parsing objects that should be ignored if they are malformed. |
| 33 | + */ |
| 34 | +public class XContentSubParser implements XContentParser { |
| 35 | + |
| 36 | + private final XContentParser parser; |
| 37 | + private int level; |
| 38 | + private boolean closed; |
| 39 | + |
| 40 | + public XContentSubParser(XContentParser parser) { |
| 41 | + this.parser = parser; |
| 42 | + if (parser.currentToken() != Token.START_OBJECT) { |
| 43 | + throw new IllegalStateException("The sub parser has to be created on the start of an object"); |
| 44 | + } |
| 45 | + level = 1; |
| 46 | + } |
| 47 | + |
| 48 | + @Override |
| 49 | + public XContentType contentType() { |
| 50 | + return parser.contentType(); |
| 51 | + } |
| 52 | + |
| 53 | + @Override |
| 54 | + public Token nextToken() throws IOException { |
| 55 | + if (level > 0) { |
| 56 | + Token token = parser.nextToken(); |
| 57 | + if (token == Token.START_OBJECT || token == Token.START_ARRAY) { |
| 58 | + level++; |
| 59 | + } else if (token == Token.END_OBJECT || token == Token.END_ARRAY) { |
| 60 | + level--; |
| 61 | + } |
| 62 | + return token; |
| 63 | + } else { |
| 64 | + return null; // we have reached the end of the wrapped object |
| 65 | + } |
| 66 | + } |
| 67 | + |
| 68 | + @Override |
| 69 | + public void skipChildren() throws IOException { |
| 70 | + Token token = parser.currentToken(); |
| 71 | + if (token != Token.START_OBJECT && token != Token.START_ARRAY) { |
| 72 | + // skip if not starting on an object or an array |
| 73 | + return; |
| 74 | + } |
| 75 | + int backToLevel = level - 1; |
| 76 | + while (nextToken() != null) { |
| 77 | + if (level <= backToLevel) { |
| 78 | + return; |
| 79 | + } |
| 80 | + } |
| 81 | + } |
| 82 | + |
| 83 | + @Override |
| 84 | + public Token currentToken() { |
| 85 | + return parser.currentToken(); |
| 86 | + } |
| 87 | + |
| 88 | + @Override |
| 89 | + public String currentName() throws IOException { |
| 90 | + return parser.currentName(); |
| 91 | + } |
| 92 | + |
| 93 | + @Override |
| 94 | + public Map<String, Object> map() throws IOException { |
| 95 | + return parser.map(); |
| 96 | + } |
| 97 | + |
| 98 | + @Override |
| 99 | + public Map<String, Object> mapOrdered() throws IOException { |
| 100 | + return parser.mapOrdered(); |
| 101 | + } |
| 102 | + |
| 103 | + @Override |
| 104 | + public Map<String, String> mapStrings() throws IOException { |
| 105 | + return parser.mapStrings(); |
| 106 | + } |
| 107 | + |
| 108 | + @Override |
| 109 | + public Map<String, String> mapStringsOrdered() throws IOException { |
| 110 | + return parser.mapStringsOrdered(); |
| 111 | + } |
| 112 | + |
| 113 | + @Override |
| 114 | + public List<Object> list() throws IOException { |
| 115 | + return parser.list(); |
| 116 | + } |
| 117 | + |
| 118 | + @Override |
| 119 | + public List<Object> listOrderedMap() throws IOException { |
| 120 | + return parser.listOrderedMap(); |
| 121 | + } |
| 122 | + |
| 123 | + @Override |
| 124 | + public String text() throws IOException { |
| 125 | + return parser.text(); |
| 126 | + } |
| 127 | + |
| 128 | + @Override |
| 129 | + public String textOrNull() throws IOException { |
| 130 | + return parser.textOrNull(); |
| 131 | + } |
| 132 | + |
| 133 | + @Override |
| 134 | + public CharBuffer charBufferOrNull() throws IOException { |
| 135 | + return parser.charBufferOrNull(); |
| 136 | + } |
| 137 | + |
| 138 | + @Override |
| 139 | + public CharBuffer charBuffer() throws IOException { |
| 140 | + return parser.charBuffer(); |
| 141 | + } |
| 142 | + |
| 143 | + @Override |
| 144 | + public Object objectText() throws IOException { |
| 145 | + return parser.objectText(); |
| 146 | + } |
| 147 | + |
| 148 | + @Override |
| 149 | + public Object objectBytes() throws IOException { |
| 150 | + return parser.objectBytes(); |
| 151 | + } |
| 152 | + |
| 153 | + @Override |
| 154 | + public boolean hasTextCharacters() { |
| 155 | + return parser.hasTextCharacters(); |
| 156 | + } |
| 157 | + |
| 158 | + @Override |
| 159 | + public char[] textCharacters() throws IOException { |
| 160 | + return parser.textCharacters(); |
| 161 | + } |
| 162 | + |
| 163 | + @Override |
| 164 | + public int textLength() throws IOException { |
| 165 | + return parser.textLength(); |
| 166 | + } |
| 167 | + |
| 168 | + @Override |
| 169 | + public int textOffset() throws IOException { |
| 170 | + return parser.textOffset(); |
| 171 | + } |
| 172 | + |
| 173 | + @Override |
| 174 | + public Number numberValue() throws IOException { |
| 175 | + return parser.numberValue(); |
| 176 | + } |
| 177 | + |
| 178 | + @Override |
| 179 | + public NumberType numberType() throws IOException { |
| 180 | + return parser.numberType(); |
| 181 | + } |
| 182 | + |
| 183 | + @Override |
| 184 | + public short shortValue(boolean coerce) throws IOException { |
| 185 | + return parser.shortValue(coerce); |
| 186 | + } |
| 187 | + |
| 188 | + @Override |
| 189 | + public int intValue(boolean coerce) throws IOException { |
| 190 | + return parser.intValue(coerce); |
| 191 | + } |
| 192 | + |
| 193 | + @Override |
| 194 | + public long longValue(boolean coerce) throws IOException { |
| 195 | + return parser.longValue(coerce); |
| 196 | + } |
| 197 | + |
| 198 | + @Override |
| 199 | + public float floatValue(boolean coerce) throws IOException { |
| 200 | + return parser.floatValue(coerce); |
| 201 | + } |
| 202 | + |
| 203 | + @Override |
| 204 | + public double doubleValue(boolean coerce) throws IOException { |
| 205 | + return parser.doubleValue(); |
| 206 | + } |
| 207 | + |
| 208 | + @Override |
| 209 | + public short shortValue() throws IOException { |
| 210 | + return parser.shortValue(); |
| 211 | + } |
| 212 | + |
| 213 | + @Override |
| 214 | + public int intValue() throws IOException { |
| 215 | + return parser.intValue(); |
| 216 | + } |
| 217 | + |
| 218 | + @Override |
| 219 | + public long longValue() throws IOException { |
| 220 | + return parser.longValue(); |
| 221 | + } |
| 222 | + |
| 223 | + @Override |
| 224 | + public float floatValue() throws IOException { |
| 225 | + return parser.floatValue(); |
| 226 | + } |
| 227 | + |
| 228 | + @Override |
| 229 | + public double doubleValue() throws IOException { |
| 230 | + return parser.doubleValue(); |
| 231 | + } |
| 232 | + |
| 233 | + @Override |
| 234 | + public boolean isBooleanValue() throws IOException { |
| 235 | + return parser.isBooleanValue(); |
| 236 | + } |
| 237 | + |
| 238 | + @Override |
| 239 | + public boolean booleanValue() throws IOException { |
| 240 | + return parser.booleanValue(); |
| 241 | + } |
| 242 | + |
| 243 | + @Override |
| 244 | + public byte[] binaryValue() throws IOException { |
| 245 | + return parser.binaryValue(); |
| 246 | + } |
| 247 | + |
| 248 | + @Override |
| 249 | + public XContentLocation getTokenLocation() { |
| 250 | + return parser.getTokenLocation(); |
| 251 | + } |
| 252 | + |
| 253 | + @Override |
| 254 | + public <T> T namedObject(Class<T> categoryClass, String name, Object context) throws IOException { |
| 255 | + return parser.namedObject(categoryClass, name, context); |
| 256 | + } |
| 257 | + |
| 258 | + @Override |
| 259 | + public NamedXContentRegistry getXContentRegistry() { |
| 260 | + return parser.getXContentRegistry(); |
| 261 | + } |
| 262 | + |
| 263 | + @Override |
| 264 | + public boolean isClosed() { |
| 265 | + return closed; |
| 266 | + } |
| 267 | + |
| 268 | + @Override |
| 269 | + public DeprecationHandler getDeprecationHandler() { |
| 270 | + return parser.getDeprecationHandler(); |
| 271 | + } |
| 272 | + |
| 273 | + @Override |
| 274 | + public void close() throws IOException { |
| 275 | + if (closed == false) { |
| 276 | + closed = true; |
| 277 | + while (true) { |
| 278 | + if (nextToken() == null) { |
| 279 | + return; |
| 280 | + } |
| 281 | + } |
| 282 | + } |
| 283 | + } |
| 284 | +} |
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