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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.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.security.cert.Certificate;
import java.util.jar.Attributes;
import java.util.jar.Manifest;

/**
 * Directory backed {@link ResourceHandle} implementation.
 * 
 * @author Dain Sundstrom
 */
public class DirectoryResourceHandle extends AbstractResourceHandle {

	private final String name;
	private final File file;
	private final Manifest manifest;
	private final URL url;
	private final URL codeSource;

	public DirectoryResourceHandle(String name, File file, File codeSource, Manifest manifest)
			throws MalformedURLException {
		if (file == null) {
			throw new IllegalArgumentException("Illegal null file specified for DirectoryResourceHandle");
		}
		if (codeSource == null) {
			throw new IllegalArgumentException("Illegal null codeSource specified for DirectoryResourceHandle");
		}
		this.name = name;
		this.file = file;
		this.url = file.toURI().toURL();
		this.codeSource = codeSource.toURI().toURL();
		this.manifest = manifest;
	}

	public String getName() {
		return name;
	}

	public URL getUrl() {
		return url;
	}

	public URL getCodeSourceUrl() {
		return codeSource;
	}

	public boolean isDirectory() {
		return file.isDirectory();
	}

	public InputStream getInputStream() throws IOException {
		if (file.isDirectory()) {
			return new IoUtil.EmptyInputStream();
		}
		return new FileInputStream(file);
	}

	public int getContentLength() {
		if (file.isDirectory() || file.length() > Integer.MAX_VALUE) {
			return -1;
		} else {
			return (int) file.length();
		}
	}

	public Manifest getManifest() throws IOException {
		return manifest;
	}

	public Attributes getAttributes() throws IOException {
		if (manifest == null) {
			return null;
		}
		return manifest.getAttributes(getName());
	}

	/**
	 * Always return null. This could be implemented by verifying the signatures in the manifest file against the actual
	 * file, but we don't need this right now.
	 * 
	 * @return null
	 */
	public Certificate[] getCertificates() {
		return null;
	}
}