in maven-3.0.x/src/main/java/org/sonatype/aether/util/artifact/AbstractArtifact.java [130:142]
public String toString()
{
StringBuilder buffer = new StringBuilder( 128 );
buffer.append( getGroupId() );
buffer.append( ':' ).append( getArtifactId() );
buffer.append( ':' ).append( getExtension() );
if ( getClassifier().length() > 0 )
{
buffer.append( ':' ).append( getClassifier() );
}
buffer.append( ':' ).append( getVersion() );
return buffer.toString();
}