org.projectforge.common.GZIPHelper.java Source code

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Here is the source code for org.projectforge.common.GZIPHelper.java

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/////////////////////////////////////////////////////////////////////////////
//
// Project ProjectForge Community Edition
//         www.projectforge.org
//
// Copyright (C) 2001-2013 Kai Reinhard (k.reinhard@micromata.de)
//
// ProjectForge is dual-licensed.
//
// This community edition is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License as published
// by the Free Software Foundation; version 3 of the License.
//
// This community edition 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 General
// Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with this program; if not, see http://www.gnu.org/licenses/.
//
/////////////////////////////////////////////////////////////////////////////

package org.projectforge.common;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;

import org.apache.commons.io.IOUtils;

public class GZIPHelper {
    private static final org.apache.log4j.Logger log = org.apache.log4j.Logger.getLogger(GZIPHelper.class);

    /**
     * @param str
     * @return Base64 encoded byte array.
     */
    public static String compress(final String str) {
        if (str == null || str.length() == 0) {
            return str;
        }
        final ByteArrayOutputStream out = new ByteArrayOutputStream();
        try {
            final GZIPOutputStream gzip = new GZIPOutputStream(out);
            gzip.write(str.getBytes());
            gzip.close();
            return Base64Helper.encodeObject(out.toByteArray());
        } catch (final IOException ex) {
            log.error("Error while compressing string: " + ex.getMessage(), ex);
            return null;
        }
    }

    /**
     * @param base64ByteArray
     * @return
     */
    public static String uncompress(final String base64ByteArray) {
        if (base64ByteArray == null || base64ByteArray.length() == 0) {
            return base64ByteArray;
        }
        try {
            final byte[] byteArray = (byte[]) Base64Helper.decodeObject(base64ByteArray);
            final ByteArrayInputStream in = new ByteArrayInputStream(byteArray);
            final GZIPInputStream gzip = new GZIPInputStream(in);
            final ByteArrayOutputStream out = new ByteArrayOutputStream();
            IOUtils.copy(gzip, out);
            gzip.close();
            return out.toString();
        } catch (final IOException ex) {
            log.error("Error while uncompressing string: " + ex.getMessage(), ex);
            return null;
        } catch (final ClassNotFoundException ex) {
            log.error("Error while uncompressing string: " + ex.getMessage(), ex);
            return null;
        }
    }
}