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package org.apache.maven.cli.transfer;
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
import java.io.PrintStream;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import org.eclipse.aether.transfer.TransferCancelledException;
import org.eclipse.aether.transfer.TransferEvent;
import org.eclipse.aether.transfer.TransferResource;
/**
* Console download progress meter.
*
* @author <a href="mailto:brett@apache.org">Brett Porter</a>
*/
public class ConsoleMavenTransferListener
extends AbstractMavenTransferListener
{
private Map<TransferResource, Long> downloads = new ConcurrentHashMap<TransferResource, Long>();
private int lastLength;
public ConsoleMavenTransferListener( PrintStream out )
{
super( out );
}
@Override
public void transferProgressed( TransferEvent event )
throws TransferCancelledException
{
TransferResource resource = event.getResource();
downloads.put( resource, event.getTransferredBytes() );
StringBuilder buffer = new StringBuilder( 64 );
for ( Map.Entry<TransferResource, Long> entry : downloads.entrySet() )
{
long total = entry.getKey().getContentLength();
Long complete = entry.getValue();
// NOTE: This null check guards against http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6312056
if ( complete != null )
{
buffer.append( getStatus( complete, total ) ).append( " " );
}
}
int pad = lastLength - buffer.length();
lastLength = buffer.length();
pad( buffer, pad );
buffer.append( '\r' );
out.print( buffer.toString() );
}
private String getStatus( long complete, long total )
{
if ( total >= 1024 )
{
return toKB( complete ) + "/" + toKB( total ) + " KB ";
}
else if ( total >= 0 )
{
return complete + "/" + total + " B ";
}
else if ( complete >= 1024 )
{
return toKB( complete ) + " KB ";
}
else
{
return complete + " B ";
}
}
private void pad( StringBuilder buffer, int spaces )
{
String block = " ";
while ( spaces > 0 )
{
int n = Math.min( spaces, block.length() );
buffer.append( block, 0, n );
spaces -= n;
}
}
@Override
public void transferSucceeded( TransferEvent event )
{
transferCompleted( event );
super.transferSucceeded( event );
}
@Override
public void transferFailed( TransferEvent event )
{
transferCompleted( event );
super.transferFailed( event );
}
private void transferCompleted( TransferEvent event )
{
downloads.remove( event.getResource() );
StringBuilder buffer = new StringBuilder( 64 );
pad( buffer, lastLength );
buffer.append( '\r' );
out.print( buffer.toString() );
}
}
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