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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  package org.yaml.snakeyaml.issues.issue127;
17  
18  import java.util.LinkedHashMap;
19  import java.util.Map;
20  
21  import junit.framework.TestCase;
22  
23  import org.yaml.snakeyaml.Yaml;
24  import org.yaml.snakeyaml.nodes.Node;
25  import org.yaml.snakeyaml.nodes.Tag;
26  import org.yaml.snakeyaml.representer.Represent;
27  import org.yaml.snakeyaml.representer.Representer;
28  
29  public class NullAliasTest extends TestCase {
30      private static final Tag MY_TAG = new Tag("tag:example.com,2011:bean");
31  
32      public void testRespresenter() {
33          Bean bean = new Bean();
34  
35          bean.setA("a"); // leave b null
36          Yaml yaml = new Yaml(new BeanRepresenter());
37          String output = yaml.dump(bean);
38          assertEquals("!<tag:example.com,2011:bean>\na: a\nb: null\n", output);
39      }
40  
41      class BeanRepresenter extends Representer {
42          public BeanRepresenter() {
43              this.representers.put(Bean.class, new RepresentBean());
44          }
45  
46          private class RepresentBean implements Represent {
47              public Node representData(Object data) {
48                  Bean bean = (Bean) data;
49                  Map<String, Object> fields = new LinkedHashMap<String, Object>(2);
50                  fields.put("a", bean.getA());
51                  fields.put("b", bean.getB());
52                  return representMapping(MY_TAG, fields, false);
53              }
54          }
55      }
56  }