001    package org.apache.maven.cli;
002    
003    /*
004     * Licensed to the Apache Software Foundation (ASF) under one
005     * or more contributor license agreements.  See the NOTICE file
006     * distributed with this work for additional information
007     * regarding copyright ownership.  The ASF licenses this file
008     * to you under the Apache License, Version 2.0 (the
009     * "License"); you may not use this file except in compliance
010     * with the License.  You may obtain a copy of the License at
011     *
012     *  http://www.apache.org/licenses/LICENSE-2.0
013     *
014     * Unless required by applicable law or agreed to in writing,
015     * software distributed under the License is distributed on an
016     * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
017     * KIND, either express or implied.  See the License for the
018     * specific language governing permissions and limitations
019     * under the License.
020     */
021    
022    import java.io.PrintStream;
023    import java.util.Map;
024    import java.util.concurrent.ConcurrentHashMap;
025    
026    import org.sonatype.aether.transfer.TransferCancelledException;
027    import org.sonatype.aether.transfer.TransferEvent;
028    import org.sonatype.aether.transfer.TransferResource;
029    
030    /**
031     * Console download progress meter.
032     * 
033     * @author <a href="mailto:brett@apache.org">Brett Porter</a>
034     */
035    public class ConsoleMavenTransferListener
036        extends AbstractMavenTransferListener
037    {
038    
039        private Map<TransferResource, Long> downloads = new ConcurrentHashMap<TransferResource, Long>();
040    
041        private int lastLength;
042    
043        public ConsoleMavenTransferListener( PrintStream out )
044        {
045            super( out );
046        }
047    
048        @Override
049        public void transferProgressed( TransferEvent event )
050            throws TransferCancelledException
051        {
052            TransferResource resource = event.getResource();
053            downloads.put( resource, Long.valueOf( event.getTransferredBytes() ) );
054    
055            StringBuilder buffer = new StringBuilder( 64 );
056    
057            for ( Map.Entry<TransferResource, Long> entry : downloads.entrySet() )
058            {
059                long total = entry.getKey().getContentLength();
060                Long complete = entry.getValue();
061                // NOTE: This null check guards against http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6312056
062                if ( complete != null )
063                {
064                    buffer.append( getStatus( complete.longValue(), total ) ).append( "  " );
065                }
066            }
067    
068            int pad = lastLength - buffer.length();
069            lastLength = buffer.length();
070            pad( buffer, pad );
071            buffer.append( '\r' );
072    
073            out.print( buffer );
074        }
075    
076        private String getStatus( long complete, long total )
077        {
078            if ( total >= 1024 )
079            {
080                return toKB( complete ) + "/" + toKB( total ) + " KB ";
081            }
082            else if ( total >= 0 )
083            {
084                return complete + "/" + total + " B ";
085            }
086            else if ( complete >= 1024 )
087            {
088                return toKB( complete ) + " KB ";
089            }
090            else
091            {
092                return complete + " B ";
093            }
094        }
095    
096        private void pad( StringBuilder buffer, int spaces )
097        {
098            String block = "                                        ";
099            while ( spaces > 0 )
100            {
101                int n = Math.min( spaces, block.length() );
102                buffer.append( block, 0, n );
103                spaces -= n;
104            }
105        }
106    
107        @Override
108        public void transferSucceeded( TransferEvent event )
109        {
110            transferCompleted( event );
111    
112            super.transferSucceeded( event );
113        }
114    
115        @Override
116        public void transferFailed( TransferEvent event )
117        {
118            transferCompleted( event );
119    
120            super.transferFailed( event );
121        }
122    
123        private void transferCompleted( TransferEvent event )
124        {
125            downloads.remove( event.getResource() );
126    
127            StringBuilder buffer = new StringBuilder( 64 );
128            pad( buffer, lastLength );
129            buffer.append( '\r' );
130            out.print( buffer );
131        }
132    
133    }