/tags/release-0.0.0-rc0/hive/external/serde/src/java/org/apache/hadoop/hive/serde2/typeinfo/ListTypeInfo.java

/**

 * 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.typeinfo;



import java.io.Serializable;



import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector.Category;



/**

 * A List Type has homogeneous elements. All elements of the List has the same

 * TypeInfo which is returned by getListElementTypeInfo.

 * 

 * Always use the TypeInfoFactory to create new TypeInfo objects, instead of

 * directly creating an instance of this class.

 */

public final class ListTypeInfo extends TypeInfo implements Serializable {



  private static final long serialVersionUID = 1L;

  private TypeInfo listElementTypeInfo;



  /**

   * For java serialization use only.

   */

  public ListTypeInfo() {

  }



  @Override

  public String getTypeName() {

    return org.apache.hadoop.hive.serde.Constants.LIST_TYPE_NAME + "<"

        + listElementTypeInfo.getTypeName() + ">";

  }



  /**

   * For java serialization use only.

   */

  public void setListElementTypeInfo(TypeInfo listElementTypeInfo) {

    this.listElementTypeInfo = listElementTypeInfo;

  }



  /**

   * For TypeInfoFactory use only.

   */

  ListTypeInfo(TypeInfo elementTypeInfo) {

    listElementTypeInfo = elementTypeInfo;

  }



  @Override

  public Category getCategory() {

    return Category.LIST;

  }



  public TypeInfo getListElementTypeInfo() {

    return listElementTypeInfo;

  }



  @Override

  public boolean equals(Object other) {

    if (this == other) {

      return true;

    }

    if (!(other instanceof ListTypeInfo)) {

      return false;

    }

    return getListElementTypeInfo().equals(

        ((ListTypeInfo) other).getListElementTypeInfo());

  }



  @Override

  public int hashCode() {

    return listElementTypeInfo.hashCode();

  }



}