001package org.apache.maven.cli.transfer;
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
022import java.io.PrintStream;
023import java.util.Map;
024import java.util.concurrent.ConcurrentHashMap;
025
026import org.eclipse.aether.transfer.TransferCancelledException;
027import org.eclipse.aether.transfer.TransferEvent;
028import org.eclipse.aether.transfer.TransferResource;
029
030/**
031 * Console download progress meter.
032 * 
033 * @author <a href="mailto:brett@apache.org">Brett Porter</a>
034 */
035public 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, 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, 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.toString() );
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.toString() );
131    }
132
133}