/**
 *
 *  Copyright 2005 The Apache Software Foundation or its licensors, as applicable.
 *
 *  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.apache.tuscany.container.ruby.loader;

import java.net.URL;

import javax.xml.namespace.QName;
import javax.xml.stream.XMLStreamReader;

import org.apache.tuscany.container.extension.loader.AbstractImplementationLoader;
import org.apache.tuscany.container.ruby.assembly.RubyImplementation;
import org.apache.tuscany.core.config.MissingResourceException;
import org.apache.tuscany.core.loader.LoaderContext;
import org.osoa.sca.annotations.Destroy;
import org.osoa.sca.annotations.Init;
import org.osoa.sca.annotations.Scope;

/**
 * Ruby implementation loader.
 *
 */
@Scope("MODULE")
public class RubyImplementationLoader extends AbstractImplementationLoader<RubyImplementation> {

	// Qualified name for the Ruby implementation.
	public static final QName NAME = new QName("http://org.apache.tuscany/xmlns/ruby/0.9", "implementation.ruby");

    /**
     * Lifecycle method registers the implementation loader.
     *
     */
    @Init(eager = true)
    public void start() {
        registry.registerLoader(NAME, this);
    }

    /**
     * Lifecycle method deregisters the implementation loader.
     *
     */
    @Destroy
    public void stop() {
        registry.unregisterLoader(NAME, this);
    }
	
	/**
	 * Required to be implemented by the concrete classes.
	 * @return Implementation object.
	 */
	protected RubyImplementation getAssemblyObject(XMLStreamReader reader, LoaderContext loaderContext) {
		
		RubyImplementation rubyImplementation = new RubyImplementation();
		String script = reader.getAttributeValue(null, "script");
		
		rubyImplementation.setScript(script);
		rubyImplementation.setResourceLoader(loaderContext.getResourceLoader());

		return rubyImplementation;
		
	}

    /**
     * Gets the side file.
     * 
     * @param reader Reader for the module file.
     * @param loaderContext Loader context.
     * @return Side file Url.
     * @throws MissingResourceException
     */
	protected URL getSideFile(XMLStreamReader reader, LoaderContext loaderContext) 
	throws MissingResourceException {
		
		String script = reader.getAttributeValue(null, "script");
		String sidefile = script.substring(0, script.lastIndexOf('.')) + ".componentType";
        URL componentTypeFile = loaderContext.getResourceLoader().getResource(sidefile);
        if (componentTypeFile == null) {
            throw new MissingResourceException(sidefile);
        }
		return componentTypeFile;
		
	}

}