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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.IOException;
import java.io.InputStream;
import java.net.JarURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLStreamHandler;
import java.security.Permission;
import java.security.cert.Certificate;
import java.util.jar.Attributes;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import java.util.jar.Manifest;

/**
 * @author Dain Sundstrom
 */
public class JarFileUrlConnection extends JarURLConnection {

	public static final URL DUMMY_JAR_URL;
	static {
		try {
			DUMMY_JAR_URL = new URL("jar", "", -1, "file:dummy!/", new URLStreamHandler() {
				protected URLConnection openConnection(URL u) {
					throw new UnsupportedOperationException();
				}
			});
		} catch (Exception e) {
			throw new ExceptionInInitializerError(e);
		}
	}

	private final URL url;
	private final JarFile jarFile;
	private final JarEntry jarEntry;
	private final URL jarFileUrl;

	public JarFileUrlConnection(URL url, JarFile jarFile, JarEntry jarEntry) throws MalformedURLException {
		super(DUMMY_JAR_URL);

		if (url == null) {
			throw new IllegalArgumentException("Illegal null url specified for JarFileUrlConnection");
		}
		if (jarFile == null) {
			throw new IllegalArgumentException("Illegal null jarFile specified for JarFileUrlConnection");
		}
		if (jarEntry == null) {
			throw new IllegalArgumentException("Illegal null jarEntry specified for JarFileUrlConnection");
		}
		this.url = url;
		this.jarFile = jarFile;
		this.jarEntry = jarEntry;
		jarFileUrl = new File(jarFile.getName()).toURI().toURL();
	}

	public JarFile getJarFile() throws IOException {
		return jarFile;
	}

	public synchronized void connect() {
	}

	public URL getJarFileURL() {
		return jarFileUrl;
	}

	public String getEntryName() {
		return getJarEntry().getName();
	}

	public Manifest getManifest() throws IOException {
		return jarFile.getManifest();
	}

	public JarEntry getJarEntry() {
		return jarEntry;
	}

	public Attributes getAttributes() throws IOException {
		return getJarEntry().getAttributes();
	}

	public Attributes getMainAttributes() throws IOException {
		return getManifest().getMainAttributes();
	}

	public Certificate[] getCertificates() throws IOException {
		return getJarEntry().getCertificates();
	}

	public URL getURL() {
		return url;
	}

	public long getLastModified() {
		return getJarEntry().getTime();
	}

	public int getContentLength() {
		long size = getJarEntry().getSize();
		if (size > Integer.MAX_VALUE) {
			return -1;
		}
		return (int) size;
	}

	public synchronized InputStream getInputStream() throws IOException {
		return jarFile.getInputStream(jarEntry);
	}

	public Permission getPermission() throws IOException {
		return jarFileUrl.openConnection().getPermission();
	}

	public String toString() {
		return JarFileUrlConnection.class.getName() + ":" + url;
	}
}