package org.apache.maven.plugins.shade.resource;

/*
 * 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.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.jar.JarEntry;
import java.util.jar.JarOutputStream;
import java.util.regex.Pattern;

import org.apache.maven.plugins.shade.relocation.Relocator;
import org.codehaus.plexus.util.IOUtil;

/**
 * An appending transformer for resource bundles
 * 
 * @author Robert Scholte
 * @since 3.0.0
 */
public class ResourceBundleAppendingTransformer implements ResourceTransformer
{
    private Map<String, ByteArrayOutputStream>  dataMap = new HashMap<String, ByteArrayOutputStream>();
    
    private Pattern resourceBundlePattern;
    
    /**
     * the base name of the resource bundle, a fully qualified class name
     */
    public void setBasename( String basename )
    {
        resourceBundlePattern = Pattern.compile( basename + "(_[a-zA-Z]+){0,3}\\.properties" );
    }

    public boolean canTransformResource( String r )
    {
        if ( resourceBundlePattern != null && resourceBundlePattern.matcher( r ).matches() )
        {
            return true;
        }

        return false;
    }

    public void processResource( String resource, InputStream is, List<Relocator> relocators )
        throws IOException
    {
        ByteArrayOutputStream data = dataMap.get( resource );
        if ( data == null )
        {
            data = new ByteArrayOutputStream();
            dataMap.put( resource, data );
        }
        
        IOUtil.copy( is, data );
        data.write( '\n' );
    }

    public boolean hasTransformedResource()
    {
        return !dataMap.isEmpty();
    }

    public void modifyOutputStream( JarOutputStream jos )
        throws IOException
    {
        for ( Map.Entry<String, ByteArrayOutputStream> dataEntry : dataMap.entrySet() )
        {
            jos.putNextEntry( new JarEntry( dataEntry.getKey() ) );

            IOUtil.copy( new ByteArrayInputStream( dataEntry.getValue().toByteArray() ), jos );
            dataEntry.getValue().reset();
        }
    }

}
