1   /*
2    * Copyright 2017 LINE Corporation
3    *
4    * LINE Corporation licenses this file to you under the Apache License,
5    * version 2.0 (the "License"); you may not use this file except in compliance
6    * with the License. You may obtain a copy of the License at:
7    *
8    *   https://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13   * License for the specific language governing permissions and limitations
14   * under the License.
15   */
16  /*
17   * Copyright (c) 2014, Francis Galiegue (fgaliegue@gmail.com)
18   *
19   * This software is dual-licensed under:
20   *
21   * - the Lesser General Public License (LGPL) version 3.0 or, at your option, any
22   *   later version;
23   * - the Apache Software License (ASL) version 2.0.
24   *
25   * The text of this file and of both licenses is available at the root of this
26   * project or, if you have the jar distribution, in directory META-INF/, under
27   * the names LGPL-3.0.txt and ASL-2.0.txt respectively.
28   *
29   * Direct link to the sources:
30   *
31   * - LGPL 3.0: https://www.gnu.org/licenses/lgpl-3.0.txt
32   * - ASL 2.0: https://www.apache.org/licenses/LICENSE-2.0.txt
33   */
34  
35  package com.linecorp.centraldogma.common.jsonpatch;
36  
37  import static java.util.Objects.requireNonNull;
38  
39  import com.fasterxml.jackson.annotation.JsonCreator;
40  import com.fasterxml.jackson.annotation.JsonProperty;
41  import com.fasterxml.jackson.core.JsonPointer;
42  import com.fasterxml.jackson.databind.JsonNode;
43  
44  /**
45   * JSON Patch {@code copy} operation.
46   *
47   * <p>For this operation, {@code from} is the JSON Pointer of the value to copy,
48   * and {@code path} is the destination where the value should be copied.</p>
49   *
50   * <p>It is an error if {@code from} fails to resolve to a JSON value.</p>
51   */
52  public final class CopyOperation extends DualPathOperation {
53  
54      /**
55       * Creates a new instance.
56       */
57      @JsonCreator
58      CopyOperation(@JsonProperty("from") final JsonPointer from,
59                    @JsonProperty("path") final JsonPointer path) {
60          super("copy", from, path);
61      }
62  
63      @Override
64      public JsonNode apply(final JsonNode node) {
65          requireNonNull(node, "node");
66          final JsonPointer from = from();
67          JsonNode source = node.at(from);
68          if (source.isMissingNode()) {
69              throw new JsonPatchConflictException("non-existent source path: " + from);
70          }
71  
72          final JsonPointer path = path();
73          if (path.toString().isEmpty()) {
74              return source;
75          }
76  
77          final JsonNode targetParent = ensureTargetParent(node, path);
78          source = source.deepCopy();
79          return targetParent.isArray() ? AddOperation.addToArray(path, node, source)
80                                        : AddOperation.addToObject(path, node, source);
81      }
82  }