1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 */
18 package org.apache.giraph.io.gora.utils;
19
20 /**
21 * Example class for defining a way to construct Gora keys.
22 * Uses strings as keys inside Gora.
23 */
24 public class DefaultKeyFactory extends KeyFactory {
25
26 /**
27 * Builds a key from a string parameter.
28 * @param keyString the key object as a string.
29 * @return the key object.
30 */
31 @Override
32 public Object buildKey(String keyString) {
33 Object key = null;
34 if (getDataStore() == null) {
35 throw new RuntimeException(
36 "DataStore must be defined before using a key Builder.");
37 } else {
38 key = getDataStore().newKey();
39 // Do specific transformation
40 key = keyString;
41 }
42 return key;
43 }
44
45 }