org.pdfgal.pdfgalweb.utils.impl.ZipUtilsImpl.java Source code

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Here is the source code for org.pdfgal.pdfgalweb.utils.impl.ZipUtilsImpl.java

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/*
 * PDFGalWeb
 * Copyright (c) 2014, Alejandro Pernas Pan, All rights reserved.
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3.0 of the License, or (at your option) any later version.
    
 * This library 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
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library.
 */

package org.pdfgal.pdfgalweb.utils.impl;

import java.io.BufferedInputStream;
import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
import java.util.zip.ZipOutputStream;

import org.apache.commons.collections.CollectionUtils;
import org.apache.commons.lang3.StringUtils;
import org.pdfgal.pdfgalweb.utils.FileUtils;
import org.pdfgal.pdfgalweb.utils.ZipUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

@Component
public class ZipUtilsImpl implements ZipUtils {

    @Autowired
    FileUtils fileUtils;

    @Override
    public String zipFiles(final List<String> urisList, final String fileName)
            throws FileNotFoundException, IOException {

        String generatedFileName = null;

        if (CollectionUtils.isNotEmpty(urisList) && StringUtils.isNotEmpty(fileName)) {

            // Autogeneration of file name
            generatedFileName = this.fileUtils.getAutogeneratedName(fileName + ".zip");

            // ZIP file is created.
            final FileOutputStream fos = new FileOutputStream(generatedFileName);
            final ZipOutputStream zos = new ZipOutputStream(fos);

            // Files are added to ZIP.
            for (final String uri : urisList) {
                if (StringUtils.isNotEmpty(uri)) {
                    this.addToZipFile(uri, zos, fileName);
                }
            }

            zos.close();
            fos.close();
        }

        return generatedFileName;
    }

    @Override
    public List<String> saveFilesFromZip(final InputStream inputStream) throws IOException {

        final List<String> result = new ArrayList<String>();

        if (inputStream != null) {
            final ZipInputStream zis = new ZipInputStream(inputStream);

            ZipEntry entry = zis.getNextEntry();

            while (entry != null) {
                final byte[] buffer = new byte[1024];
                final String fileName = this.fileUtils.getAutogeneratedName(entry.getName());
                final File file = new File(fileName);

                final FileOutputStream fos = new FileOutputStream(file);

                int len;
                while ((len = zis.read(buffer)) > 0) {
                    fos.write(buffer, 0, len);
                }

                fos.close();
                result.add(fileName);
                entry = zis.getNextEntry();
            }

            zis.closeEntry();
            zis.close();
        }

        return result;
    }

    @Override
    public boolean isZip(final InputStream inputStream) {

        boolean result = false;

        try {
            final DataInputStream dataInputStream = new DataInputStream(new BufferedInputStream(inputStream));
            final int test = dataInputStream.readInt();
            dataInputStream.close();
            result = (test == 0x504b0304);
        } catch (final IOException e) {
            result = false;
        }

        return result;
    }

    /**
     * Adds a new file to the {@link ZipOutputStream}.
     * 
     * @param fileName
     * @param zos
     * @param originalFileName
     * @throws FileNotFoundException
     * @throws IOException
     */
    private void addToZipFile(final String fileName, final ZipOutputStream zos, final String originalFileName)
            throws IOException {

        // File is opened.
        final File file = new File(fileName);

        // File is renamed.
        final String newName = fileName.substring(fileName.indexOf(originalFileName), fileName.length());
        final File renamedFile = new File(newName);
        file.renameTo(renamedFile);

        // File is included into ZIP.
        final FileInputStream fis = new FileInputStream(renamedFile);
        final ZipEntry zipEntry = new ZipEntry(newName);
        zos.putNextEntry(zipEntry);

        final byte[] bytes = new byte[1024];
        int length;
        while ((length = fis.read(bytes)) >= 0) {
            zos.write(bytes, 0, length);
        }

        // Closing elements.
        zos.closeEntry();
        fis.close();

        // File is deleted
        this.fileUtils.delete(newName);
    }
}