/**
 * 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.issue60;

import java.util.Arrays;
import junit.framework.TestCase;
import org.yaml.snakeyaml.DumperOptions;
import org.yaml.snakeyaml.Util;
import org.yaml.snakeyaml.Yaml;
import org.yaml.snakeyaml.introspector.Property;
import org.yaml.snakeyaml.nodes.CollectionNode;
import org.yaml.snakeyaml.nodes.MappingNode;
import org.yaml.snakeyaml.nodes.Node;
import org.yaml.snakeyaml.nodes.NodeTuple;
import org.yaml.snakeyaml.nodes.SequenceNode;
import org.yaml.snakeyaml.nodes.Tag;
import org.yaml.snakeyaml.representer.Representer;

public class SkipBeanTest extends TestCase {

  public void testSkipNull() {
    Yaml yaml = new Yaml(new SkipNullRepresenter());
    String output = yaml.dump(getBean());
    // System.out.println(output);
    assertEquals(Util.getLocalResource("issues/issue60-1.yaml"), output);
  }

  private class SkipNullRepresenter extends Representer {

    /**
     * Create
     */
    public SkipNullRepresenter() {
      super(new DumperOptions());
    }

    @Override
    protected NodeTuple representJavaBeanProperty(Object javaBean, Property property,
        Object propertyValue, Tag customTag) {
      if (propertyValue == null) {
        return null;
      } else {
        return super.representJavaBeanProperty(javaBean, property, propertyValue, customTag);
      }
    }
  }

  public void testSkipEmptyCollections() {
    Yaml yaml = new Yaml(new SkipEmptyRepresenter());
    String output = yaml.dump(getBean());
    // System.out.println(output);
    assertEquals(Util.getLocalResource("issues/issue60-2.yaml"), output);
  }

  private class SkipEmptyRepresenter extends Representer {

    /**
     * Create
     */
    public SkipEmptyRepresenter() {
      super(new DumperOptions());
    }

    @Override
    protected NodeTuple representJavaBeanProperty(Object javaBean, Property property,
        Object propertyValue, Tag customTag) {
      NodeTuple tuple =
          super.representJavaBeanProperty(javaBean, property, propertyValue, customTag);
      Node valueNode = tuple.getValueNode();
      if (Tag.NULL.equals(valueNode.getTag())) {
        return null;// skip 'null' values
      }
      if (valueNode instanceof CollectionNode) {
        if (Tag.SEQ.equals(valueNode.getTag())) {
          SequenceNode seq = (SequenceNode) valueNode;
          if (seq.getValue().isEmpty()) {
            return null;// skip empty lists
          }
        }
        if (Tag.MAP.equals(valueNode.getTag())) {
          MappingNode seq = (MappingNode) valueNode;
          if (seq.getValue().isEmpty()) {
            return null;// skip empty maps
          }
        }
      }
      return tuple;
    }
  }

  private SkipBean getBean() {
    SkipBean bean = new SkipBean();
    bean.setText("foo");
    bean.setListDate(null);
    bean.setListInt(Arrays.asList(null, 1, 2, 3));
    bean.setListStr(Arrays.asList("bar", null, "foo", null));
    return bean;
  }
}
