Copyright (c) 2011 IBM Corporation and others.
This program and the accompanying materials
are made available under the terms of the Eclipse Public License 2.0
which accompanies this distribution, and is available at
https://www.eclipse.org/legal/epl-2.0/
SPDX-License-Identifier: EPL-2.0
Contributors:
    IBM Corporation - initial API and implementation
/*******************************************************************************
 * Copyright (c) 2011 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jdt.internal.core.index;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.net.JarURLConnection;
import java.net.URL;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;

import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.Path;

public class JarIndexLocation extends IndexLocation {
	private JarFile jarFile = null;
	private JarEntry jarEntry = null;
	private URL localUrl;

	public JarIndexLocation(URL url, URL localUrl2) {
		super(url);
		this.localUrl = localUrl2;
	}

	@Override
	public boolean createNewFile() throws IOException {
		return false;
	}

	@Override
	public void close() {
		if (this.jarFile != null) {
			try {
				this.jarFile.close();
			} catch (IOException e) {
				// ignore
			}
			this.jarFile = null;
		}
	}

	@Override
	public boolean delete() {
		return false;
	}

	@Override
	public boolean equals(Object other) {
		if (!(other instanceof JarIndexLocation)) return false;
		return this.localUrl.equals(((JarIndexLocation) other).localUrl);
	}

	@Override
	public boolean exists() {
		try {
			if (this.jarFile == null) {
				JarURLConnection connection = (JarURLConnection) this.localUrl.openConnection();
				connection.setUseCaches(false);
				JarFile file = connection.getJarFile();
				if (file == null)
					return false;
				file.close();
			}
		} catch (IOException e) {
			return false;
		}
		return true;
	}

	@Override
	public String fileName() {
		return null;
	}

	@Override
	public File getIndexFile() {
		return null;
	}

	@Override
	InputStream getInputStream() throws IOException {
		if (this.jarFile == null) {
			JarURLConnection connection = (JarURLConnection) this.localUrl.openConnection();
			connection.setUseCaches(false);
			this.jarFile = connection.getJarFile();
			this.jarEntry = connection.getJarEntry();
		}
		if (this.jarFile == null || this.jarEntry == null)
			return null;
		return this.jarFile.getInputStream(this.jarEntry);
	}

	@Override
	public String getCanonicalFilePath() {
		return null;
	}

	@Override
	public long lastModified() {
		return -1;
	}

	@Override
	public long length() {
		return -1;
	}

	@Override
	public boolean startsWith(IPath path) {
		return (path.isPrefixOf(new Path(this.localUrl.getPath())));
	}

}