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/**
 * 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.
 */
package org.apache.xbean.classloader;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.net.MalformedURLException;
import java.util.jar.Manifest;

/**
 * Directory backed {@link ResourceLocation} implementation.
 * 
 * @author Dain Sundstrom
 */
public class DirectoryResourceLocation extends AbstractUrlResourceLocation {

	private final File baseDir;
	private boolean manifestLoaded = false;
	private Manifest manifest;

	public DirectoryResourceLocation(File baseDir) throws MalformedURLException {
		super(baseDir == null ? null : baseDir.toURI().toURL());
		this.baseDir = baseDir;
	}

	public ResourceHandle getResourceHandle(String resourceName) {
		File file = new File(baseDir, resourceName);
		if (!file.exists()) {
			return null;
		}
		try {
			ResourceHandle resourceHandle = new DirectoryResourceHandle(resourceName, file, baseDir, getManifestSafe());
			return resourceHandle;
		} catch (MalformedURLException e) {
			return null;
		}
	}

	public Manifest getManifest() throws IOException {
		if (!manifestLoaded) {
			File manifestFile = new File(baseDir, "META-INF/MANIFEST.MF");

			if (manifestFile.isFile() && manifestFile.canRead()) {
				FileInputStream in = null;
				try {
					in = new FileInputStream(manifestFile);
					manifest = new Manifest(in);
				} finally {
					IoUtil.close(in);
				}
			}
			manifestLoaded = true;
		}
		return manifest;
	}

	private Manifest getManifestSafe() {
		try {
			return getManifest();
		} catch (IOException e) {
			return null;
		}
	}
}