org.springframework.integration.zip.transformer.SpringZipUtils.java Source code

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Here is the source code for org.springframework.integration.zip.transformer.SpringZipUtils.java

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/*
 * Copyright 2015-2016 the original author or authors.
 *
 * 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
 *
 *      https://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.springframework.integration.zip.transformer;

import java.io.BufferedOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Collection;
import java.util.zip.ZipFile;
import java.util.zip.ZipOutputStream;

import org.apache.commons.io.IOUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.zeroturnaround.zip.ZipEntrySource;
import org.zeroturnaround.zip.ZipException;

/**
 * Once the Spring Integration Zip support matures, we need to contribute the
 * methods in this utility class back to the ZT Zip project.
 * @author Gunnar Hillert
 * @since 1.0
 */
public class SpringZipUtils {

    private static final Log logger = LogFactory.getLog(SpringZipUtils.class);

    public static byte[] pack(Collection<ZipEntrySource> entries, int compressionLevel) {

        if (logger.isDebugEnabled()) {
            logger.debug(String.format("Creating byte array from '%s'.", entries));
        }

        final ByteArrayOutputStream outputStream = new ByteArrayOutputStream();

        pack(entries, outputStream, compressionLevel);

        return outputStream.toByteArray();
    }

    public static void pack(Collection<ZipEntrySource> entries, File zip, int compressionLevel) {

        if (logger.isDebugEnabled()) {
            logger.debug("Creating '" + zip + "' from " + entries + ".");
        }

        final FileOutputStream outputStream;
        try {
            outputStream = new FileOutputStream(zip);
        } catch (FileNotFoundException e) {
            throw new IllegalStateException(String.format("File '%s' not found.", zip.getAbsolutePath()), e);
        }

        pack(entries, outputStream, compressionLevel);

    }

    private static void pack(Collection<ZipEntrySource> entries, OutputStream outputStream, int compressionLevel) {

        ZipOutputStream out = null;
        final BufferedOutputStream bufferedOutputStream = new BufferedOutputStream(outputStream);

        try {
            out = new ZipOutputStream(bufferedOutputStream);
            out.setLevel(compressionLevel);
            for (ZipEntrySource entry : entries) {
                addEntry(entry, out);
            }
        } catch (IOException e) {
            throw rethrow(e);
        } finally {
            IOUtils.closeQuietly(out);
        }

    }

    private static void addEntry(ZipEntrySource entry, ZipOutputStream out) throws IOException {
        out.putNextEntry(entry.getEntry());
        InputStream in = entry.getInputStream();
        if (in != null) {
            try {
                IOUtils.copy(in, out);
            } finally {
                IOUtils.closeQuietly(in);
            }
        }
        out.closeEntry();
    }

    private static ZipException rethrow(IOException e) {
        throw new ZipException(e);
    }

    public static void copy(InputStream in, File file) throws IOException {
        OutputStream out = new BufferedOutputStream(new FileOutputStream(file));
        try {
            IOUtils.copy(in, out);
        } finally {
            IOUtils.closeQuietly(out);
        }
    }

    public byte[] copy(InputStream in) throws IOException {
        return IOUtils.toByteArray(in);
    }

    static boolean isValid(final File file) {
        ZipFile zipfile = null;
        try {
            zipfile = new ZipFile(file);
            return true;
        } catch (IOException e) {
            return false;
        } finally {
            IOUtils.closeQuietly(zipfile);
        }
    }

}