/**
 * Copyright (c) 2008, SnakeYAML
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
 * in compliance with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 */
package org.yaml.snakeyaml.issues.issue127;

import java.util.LinkedHashMap;
import java.util.Map;
import junit.framework.TestCase;
import org.yaml.snakeyaml.DumperOptions;
import org.yaml.snakeyaml.Yaml;
import org.yaml.snakeyaml.nodes.Node;
import org.yaml.snakeyaml.nodes.Tag;
import org.yaml.snakeyaml.representer.Represent;
import org.yaml.snakeyaml.representer.Representer;

public class NullAliasTest extends TestCase {

  private static final Tag MY_TAG = new Tag("tag:example.com,2011:bean");

  public void testRespresenter() {
    Bean bean = new Bean();

    bean.setA("a"); // leave b null
    Yaml yaml = new Yaml(new BeanRepresenter());
    String output = yaml.dump(bean);
    assertEquals("!<tag:example.com,2011:bean>\na: a\nb: null\n", output);
  }

  class BeanRepresenter extends Representer {

    public BeanRepresenter() {
      super(new DumperOptions());
      this.representers.put(Bean.class, new RepresentBean());
    }

    private class RepresentBean implements Represent {

      public Node representData(Object data) {
        Bean bean = (Bean) data;
        Map<String, Object> fields = new LinkedHashMap<String, Object>(2);
        fields.put("a", bean.getA());
        fields.put("b", bean.getB());
        return representMapping(MY_TAG, fields, DumperOptions.FlowStyle.BLOCK);
      }
    }
  }
}
