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'databene commons' is an open source Java library by Volker Bergmann. It provides extensions to the Java core library by utility classes, abstract concepts and concrete implementations.

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/*
 * Copyright (C) 2004-2015 Volker Bergmann ([email protected]).
 * All rights reserved.
 *
 * Licensed 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.databene.commons;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
import java.util.zip.ZipOutputStream;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Provides ZIP-related convenience methods.
 * Created: 20.10.2011 15:19:07
 * @since 0.5.10
 * @author Volker Bergmann
 */
public class ZipUtil {

	private static final int BUFFER_SIZE = 2048;
	
	private static final Logger LOGGER = LoggerFactory.getLogger(ZipUtil.class);
	
	public static void compressAndDelete(File source, File zipFile) {
		try {
			compress(source, zipFile);
			source.delete();
		} catch (IOException e) {
			throw new RuntimeException("Unexpected error", e);
		}
	}
	
	public static void compress(File source, File zipFile) throws IOException {
		ZipOutputStream out = new ZipOutputStream(new BufferedOutputStream(new FileOutputStream(zipFile)));
		out.setMethod(ZipOutputStream.DEFLATED);
		try {
			addFileOrDirectory(source, source, out);
			out.close();
		} catch (IOException e) {
			throw new RuntimeException("Zipping the report failed");
		}
	}
	
	public static void printContent(File zipFile) {
		ZipInputStream in = null;
		try {
			in = new ZipInputStream(new BufferedInputStream(new FileInputStream(zipFile)));
			ZipEntry entry;
			while ((entry = in.getNextEntry()) != null)
				System.out.println(entry.getName());
		} catch (IOException e) {
			LOGGER.error("Error listing archive content of file " + zipFile, e);
		} finally {
			IOUtil.close(in);
		}
	}
	
	// private helpers -------------------------------------------------------------------------------------------------

	private static void addFileOrDirectory(File source, File root, ZipOutputStream out) throws IOException {
		if (source.isFile())
			addFile(source, root, out);
		else if (source.isDirectory())
			addDirectory(source, root, out);
	}

	private static void addDirectory(File source, File root, ZipOutputStream out) throws IOException {
		for (File file : source.listFiles())
			addFileOrDirectory(file, root, out);
	}

	private static void addFile(File source, File root, ZipOutputStream out) throws IOException {
		byte[] buffer = new byte[BUFFER_SIZE];
		InputStream in = new BufferedInputStream(new FileInputStream(source));
		ZipEntry entry = new ZipEntry(FileUtil.relativePath(root, source));
		out.putNextEntry(entry);
		int count;
		while ((count = in.read(buffer, 0, BUFFER_SIZE)) != -1)
			out.write(buffer, 0, count);
		in.close();
	}
	
}