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1   /*
2    * Copyright 2007-2008 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  
17  package org.gwe.app.client;
18  
19  import java.io.IOException;
20  import java.io.OutputStream;
21  
22  import org.apache.commons.logging.Log;
23  import org.apache.commons.logging.LogFactory;
24  
25  /**
26   * @author Marco Ruiz
27   * @since Oct 2, 2008
28   */
29  public interface ProgressTracker {
30  	
31  	public static final Log log = LogFactory.getLog(ProgressTracker.class);
32  
33  	public static ProgressTracker SILENT_TRACKER = new ProgressTracker() {
34  		public void trackProgress(String msg) {}
35  	};
36  	
37  	public static ProgressTracker LOG_TRACKER = new ProgressTracker() {
38  		public void trackProgress(String msg) {
39  			log.info("PROGRESS REPORT: " + msg);
40  		}
41  	};
42  	
43  	public static ProgressTracker CONSOLE_TRACKER = new ProgressTracker() {
44  		public void trackProgress(String msg) {
45  			OutputStream os = System.out;
46  			if (os != null) {
47  	        	try {
48  	        		os.write((msg + "\n").getBytes());
49  	        	} catch (IOException e) {
50  	        	}
51  	        }
52  		}
53  	};
54  	
55  	public void trackProgress(String msg);
56  }