pf4j/pf4j/src/main/java/org/pf4j/util/Unzip.java

/*
 * Copyright 2012 Decebal Suiu
 *
 * 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.pf4j.util;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;

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

/**
 * This class extracts the content of the plugin zip into a directory.
 * It's a class for only the internal use.
 *
 * @author Decebal Suiu
 */
public class Unzip {

	private static final Logger log = LoggerFactory.getLogger(Unzip.class);

    /**
     * Holds the destination directory.
     * File will be unzipped into the destination directory.
     */
    private File destination;

    /**
     * Holds path to zip file.
     */
    private File source;

    public Unzip() {
    }

    public Unzip(File source, File destination) {
        this.source = source;
        this.destination = destination;
    }

    public void setSource(File source) {
        this.source = source;
    }

    public void setDestination(File destination) {
        this.destination = destination;
    }

    public void extract() throws IOException {
        log.debug("Extract content of '{}' to '{}'", source, destination);

        // delete destination file if exists
        if (destination.exists() && destination.isDirectory()) {
            FileUtils.delete(destination.toPath());
        }

    	try (ZipInputStream zipInputStream = new ZipInputStream(new FileInputStream(source))) {
            ZipEntry zipEntry;
            while ((zipEntry = zipInputStream.getNextEntry()) != null) {
                try {
                    File file = new File(destination, zipEntry.getName());

                    // create intermediary directories - sometimes zip don't add them
                    File dir = new File(file.getParent());
                    dir.mkdirs();

                    if (zipEntry.isDirectory()) {
                        file.mkdirs();
                    } else {
                        byte[] buffer = new byte[1024];
                        int length;
                        try (FileOutputStream fos = new FileOutputStream(file)) {
                            while ((length = zipInputStream.read(buffer)) >= 0) {
                                fos.write(buffer, 0, length);
                            }
                        }
                    }
                } catch (FileNotFoundException e) {
                    log.error("File '{}' not found", zipEntry.getName());
                }
            }
        }
    }

}