/*

  * 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.giraph.io.gora.utils;

 /**

  * Example class for defining a way to construct Gora keys.

  * Uses strings as keys inside Gora.

  */

 public class DefaultKeyFactory extends KeyFactory {

   /**

    * Builds a key from a string parameter.

    * @param keyString the key object as a string.

    * @return the key object.

    */

   @Override

   public Object buildKey(String keyString) {

     Object key = null;

     if (getDataStore() == null) {

       throw new RuntimeException(

           "DataStore must be defined before using a key Builder.");

     } else {

       key = getDataStore().newKey();

       // Do specific transformation

       key = keyString;

     }

     return key;

   }

 }