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1   /*
2    *  Copyright 2006 Simon Raess
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 net.sf.beep4j.internal;
17  
18  import net.sf.beep4j.CloseChannelCallback;
19  
20  public class VerifyingCloseChannelCallback implements CloseChannelCallback {
21  	private final CloseChannelCallback target;
22  	private boolean complete;
23  	
24  	public VerifyingCloseChannelCallback(CloseChannelCallback callback) {
25  		this.target = callback;
26  	}
27  	
28  	public void verify() {
29  		if (!complete) {
30  			throw new IllegalStateException("callback is not complete");
31  		}
32  	}
33  	
34  	public void closeAccepted() {
35  		setComplete();
36  		target.closeAccepted();
37  	}
38  	
39  	public void closeDeclined(int code, String message) {
40  		setComplete();
41  		target.closeDeclined(code, message);
42  	}
43  	
44  	private void setComplete() {
45  		if (complete) {
46  			throw new IllegalStateException("callback is complete");
47  		}
48  		complete = true;
49  	}
50  }