001    /*
002     * Copyright 1999,2004 The Apache Software Foundation.
003     * 
004     * Licensed under the Apache License, Version 2.0 (the "License");
005     * you may not use this file except in compliance with the License.
006     * You may obtain a copy of the License at
007     * 
008     *      http://www.apache.org/licenses/LICENSE-2.0
009     * 
010     * Unless required by applicable law or agreed to in writing, software
011     * distributed under the License is distributed on an "AS IS" BASIS,
012     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013     * See the License for the specific language governing permissions and
014     * limitations under the License.
015     */
016    
017    package org.apache.commons.feedparser.impl;
018    
019    import java.io.ByteArrayOutputStream;
020    import java.io.OutputStream;
021    import java.io.PrintStream;
022    
023    /**
024     * Code which can run a parse but capture the output to a string to verify
025     * certain methods were called via greping the output.  This is ONLY for unit
026     * tests.
027     * 
028     * When done you can just call toString() to get the output of all the events
029     * and then grep across it.
030     * 
031     * @author <a href="mailto:burton@apache.org">Kevin A. Burton (burtonator)</a>
032     * @version $Id: CaptureOutputFeedParserListener.java 373622 2006-01-30 22:53:00Z mvdb $
033     */
034    public class CaptureOutputFeedParserListener
035        extends DebugFeedParserListener {
036    
037        public CaptureOutputFeedParserListener() {
038            super( new CapturePrintStream() );
039        }
040    
041        public String toString() {
042    
043            CapturePrintStream cps = (CapturePrintStream)out;
044            ByteArrayOutputStream bos = (ByteArrayOutputStream)cps.getOutputStream();
045    
046            return bos.toString();
047            
048        }
049        
050    }
051    
052    class CapturePrintStream extends PrintStream {
053    
054        public CapturePrintStream() {
055            super( new ByteArrayOutputStream() );
056        }
057    
058        public OutputStream getOutputStream() {
059            return out;
060        }
061        
062    }