/**
 * Copyright (C) 2001-2017 by RapidMiner and the contributors
 * 
 * Complete list of developers available at our web site:
 * 
 * http://rapidminer.com
 * 
 * This program is free software: you can redistribute it and/or modify it under the terms of the
 * GNU Affero General Public License as published by the Free Software Foundation, either version 3
 * of the License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
 * even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Affero General Public License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License along with this program.
 * If not, see http://www.gnu.org/licenses/.
*/
package com.rapidminer.operator.nio.file;

import com.rapidminer.operator.OperatorException;
import com.rapidminer.tools.Tools;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;


/**
 * The type Zip entry object.
 *
 * @author Nils Woehler
 */
public class ZipEntryObject extends FileObject {

	private static final long serialVersionUID = 1L;
	private static final String TEMP_FILE_PREFIX = "rm_file_";
	private static final String TEMP_FILE_SUFFIX = ".dump";

	private File file = null;

	private ZipEntry entry;
	private ZipFile zipFile;

    /**
     * Instantiates a new Zip entry object.
     *
     * @param entry   the entry
     * @param zipFile the zip file
     */
    public ZipEntryObject(ZipEntry entry, ZipFile zipFile) {
		super();
		this.entry = entry;
		this.zipFile = zipFile;
	}

	@Override
	public InputStream openStream() throws OperatorException {
		try {
			return zipFile.getInputStream(entry);
		} catch (IOException e) {
			throw new OperatorException("302", e, entry.getName(), e.getMessage());
		}
	}

	@Override
	public File getFile() throws OperatorException {
		if (file == null) {
			try {
				file = File.createTempFile(TEMP_FILE_PREFIX, TEMP_FILE_SUFFIX);
				file.deleteOnExit();
			} catch (IOException e) {
				throw new OperatorException("303", e, "File in " + System.getProperty("java.io.tmpdir"), e.getMessage());
			}
			try (FileOutputStream fos = new FileOutputStream(file); InputStream in = zipFile.getInputStream(entry);) {
				Tools.copyStreamSynchronously(in, fos, true);
			} catch (IOException e) {
				throw new OperatorException("303", e, file, e.getMessage());
			}
			return file;
		} else {
			return file;
		}
	}

	/**
	 * Returns the uncompressed size of the entry data in number of bytes, or -1 if not known.
	 */
	@Override
	public long getLength() throws OperatorException {
		return entry.getSize();
	}

	@Override
	public String toString() {
		return file != null ? "ZipEntry " + entry.getName() + " stored in temporary file: " + file.getAbsolutePath()
				: "ZipEntry " + entry.getName() + " from ZipFile " + zipFile.getName();
	}

	@Override
	protected void finalize() throws Throwable {
		if (file != null) {
			file.delete();
		}
		super.finalize();
	}

}
