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1   /**
2    * Copyright (c) 2008-2011, http://www.snakeyaml.org
3    *
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    *
8    *     http://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,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  
17  package org.yaml.snakeyaml.constructor;
18  
19  import org.yaml.snakeyaml.error.YAMLException;
20  import org.yaml.snakeyaml.nodes.Node;
21  
22  /**
23   * Because recursive structures are not very common we provide a way to save
24   * some typing when extending a constructor
25   */
26  public abstract class AbstractConstruct implements Construct {
27  
28      /**
29       * Fail with a reminder to provide the seconds step for a recursive
30       * structure
31       * 
32       * @see org.yaml.snakeyaml.constructor.Construct#construct2ndStep(org.yaml.snakeyaml.nodes.Node,
33       *      java.lang.Object)
34       */
35      public void construct2ndStep(Node node, Object data) {
36          if (node.isTwoStepsConstruction()) {
37              throw new IllegalStateException("Not Implemented in " + getClass().getName());
38          } else {
39              throw new YAMLException("Unexpected recursive structure for Node: " + node);
40          }
41      }
42  }