/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.hadoop.hive.serde2.objectinspector.primitive;

import org.apache.hadoop.hive.serde2.objectinspector.ConstantObjectInspector;
import org.apache.hadoop.hive.serde2.typeinfo.TypeInfoFactory;

/**
 * A WritableVoidObjectInspector inspects a NullWritable Object.
 * Note that this is also a constant object inspector.
 */
public class WritableVoidObjectInspector extends
    AbstractPrimitiveWritableObjectInspector implements
    VoidObjectInspector, ConstantObjectInspector {

  WritableVoidObjectInspector() {
    super(TypeInfoFactory.voidTypeInfo);
  }

  @Override
  public Object copyObject(Object o) {
    return o;
  }

  @Override
  public Object getWritableConstantValue() {
    return null;
  }

  @Override
  public Object getPrimitiveJavaObject(Object o) {
    return null;
  }

  @Override
  public boolean equals(Object obj) {
    return null != obj && obj instanceof WritableVoidObjectInspector;
  }
}