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1   /*
2    * Copyright 2006-2007 the original author or authors.
3    *
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    *
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  package org.springframework.batch.core.step.item;
17  
18  /**
19   * Interface for defining keys to uniquely identify items.
20   * this can be useful if the item itself cannot be modified to
21   * properly override equals.
22   * 
23   * @author Dave Syer
24   *
25   */
26  public interface KeyGenerator {
27  	
28  	Object getKey(Object item);
29  
30  }