import java.io.*;
import java.util.*;
import java.util.regex.*;
import org.codehaus.plexus.util.*;

File buildFile = new File( basedir, "maven-build.xml" );
String xml = FileUtils.fileRead( buildFile, "UTF-8" );

Matcher m = Pattern.compile( "<javac\\s+[^>]*?>" ).matcher( xml );
if ( !m.find() )
{
    throw new Exception( "Build script does not contain <javac> task." );
}

if ( m.group().indexOf( "target=\"1.3\"" ) < 0 )
{
    throw new Exception( "<javac> does not define target=1.3" );
}

if ( m.group().indexOf( "source=\"1.4\"" ) < 0 )
{
    throw new Exception( "<javac> does not define source=1.4" );
}

return true;