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1   /**
2    * Copyright (c) 2008-2012, 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  package org.yaml.snakeyaml.constructor;
17  
18  import org.yaml.snakeyaml.error.YAMLException;
19  import org.yaml.snakeyaml.nodes.Node;
20  
21  /**
22   * Because recursive structures are not very common we provide a way to save
23   * some typing when extending a constructor
24   */
25  public abstract class AbstractConstruct implements Construct {
26  
27      /**
28       * Fail with a reminder to provide the seconds step for a recursive
29       * structure
30       * 
31       * @see org.yaml.snakeyaml.constructor.Construct#construct2ndStep(org.yaml.snakeyaml.nodes.Node,
32       *      java.lang.Object)
33       */
34      public void construct2ndStep(Node node, Object data) {
35          if (node.isTwoStepsConstruction()) {
36              throw new IllegalStateException("Not Implemented in " + getClass().getName());
37          } else {
38              throw new YAMLException("Unexpected recursive structure for Node: " + node);
39          }
40      }
41  }