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 }