package org.apache.maven.repository;

/* ====================================================================
 *   Copyright 2001-2004 The Apache Software Foundation.
 *
 *   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.
 * ====================================================================
 */

import org.apache.maven.jelly.MavenJellyContext;
import org.apache.maven.project.Dependency;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * ArtifactTypeHandlerFactory 
 * Creates ArtifactTypeHandlers to create Artifacts and
 * handle the different types of dependencies.
 * 
 * This allows for different types to be specified. 
 * Add the following to your properties files to set the settings:
 * <br />
 * maven.type.handler.&lt;Type Name&gt;=org.maven....ArtifactTypeHandler
 * 
 * Uses the MavenJellyContext.
 * 
 * @author Daniel Marchant <dan@driedtoast.com>
 * @version 1.0 5:08:06 PM
 *
 */
public class ArtifactTypeHandlerFactory {

	private static Log log = LogFactory.getLog(ArtifactTypeHandlerFactory.class);
	
	public static ArtifactTypeHandler getHandler(Dependency dependency, MavenJellyContext context) {
		String type = dependency.getType();
		String name = "maven.type.handler." + type;
		String instanceName = name + ".instance";
		ArtifactTypeHandler handler = (ArtifactTypeHandler)context.getVariable(instanceName);
		if(handler != null) return handler;
		
		String className =(String)context.getVariable(name);
		
		if(className != null) {
			try {
				handler = (ArtifactTypeHandler)Class.forName(className).newInstance();
				context.setVariable(instanceName, handler);
			} catch(InstantiationException ie) {
				log.warn(" Problem instantiating the handler: " + className,ie);
			} catch(IllegalAccessException iae) {
				log.warn(" Cannot Access the handler: " + className,iae);
			} catch(ClassNotFoundException cnfe) {			
				log.warn(" ClassNot found for the handler: " + className,cnfe);
			}
		} 
		
		if(handler == null) {
			handler = new DefaultArtifactTypeHandler();
			context.setVariable(instanceName, handler);
		}
		return handler;
	}
	
	
	
}