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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.factory;
17  
18  import java.util.ArrayList;
19  import java.util.List;
20  
21  import org.springframework.batch.core.StepListener;
22  
23  /**
24   * Package private helper for step factory beans.
25   * 
26   * @author Dave Syer
27   * 
28   */
29  abstract class BatchListenerFactoryHelper {
30  
31  	public static <T> List<T> getListeners(StepListener[] listeners, Class<? super T> cls) {
32  		List<T> list = new ArrayList<T>();
33  		for (StepListener stepListener : listeners) {
34  			if (cls.isAssignableFrom(stepListener.getClass())) {
35  				@SuppressWarnings("unchecked")
36  				T listener = (T) stepListener;
37  				list.add(listener);
38  			}
39  		}
40  		return list;
41  	}
42  
43  }