PathEncodedSource.java

/*
 * Copyright 2009 Alin Dreghiciu.
 *
 * Licensed  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.
 */
package org.ops4j.pax.url.assembly.internal;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.regex.Pattern;
import org.ops4j.io.ListerUtils;

/**
 * A source of resources.
 *
 * @author Alin Dreghiciu
 * @since 1.1.0, August 31, 2009
 */
public class PathEncodedSource
    implements Source
{

    /**
     * Base source directory.
     */
    private final String m_path;
    /**
     * List of includes.
     */
    private final Pattern[] m_includes;
    /**
     * List of excludes.
     */
    private final Pattern[] m_excludes;

    /**
     * Constructor.
     *
     * @param path path encoded source (path[!/[include|!exclude][,[include|!exclude]]])
     */
    public PathEncodedSource( final String path )
    {
        if( path.contains( "!/" ) )
        {
            final int startOfFilter = path.lastIndexOf( "!/" );
            m_path = path.substring( 0, startOfFilter );

            final Collection<Pattern> includes = new ArrayList<Pattern>();
            final Collection<Pattern> excludes = new ArrayList<Pattern>();

            final String[] filters = path.substring( startOfFilter + 2 ).split( "&" );
            for( String filter : filters )
            {
                if( filter.startsWith( "!" ) )
                {
                    excludes.add( ListerUtils.parseFilter( filter.substring( 1 ) ) );
                }
                else
                {
                    includes.add( ListerUtils.parseFilter( filter ) );
                }
            }
            m_includes = includes.toArray( new Pattern[includes.size()] );
            m_excludes = excludes.toArray( new Pattern[excludes.size()] );
        }
        else
        {
            m_path = path;
            m_includes = new Pattern[]{ ListerUtils.parseFilter( "**" ) };
            m_excludes = new Pattern[0];
        }

    }

    /**
     * {@inheritDoc}
     */
    public String path()
    {
        return m_path;
    }

    /**
     * {@inheritDoc}
     */
    public Pattern[] includes()
    {
        return m_includes;
    }

    /**
     * {@inheritDoc}
     */
    public Pattern[] excludes()
    {
        return m_excludes;
    }

    @Override
    public String toString()
    {
        return String.format(
            "%s includes(%s) excludes(%s)", m_path, Arrays.deepToString( m_includes ), Arrays.deepToString( m_excludes )
        );
    }

}