com.jaspersoft.jasperserver.api.metadata.common.domain.util.GzipDataContainer.java Source code

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Here is the source code for com.jaspersoft.jasperserver.api.metadata.common.domain.util.GzipDataContainer.java

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/*
 * Copyright (C) 2005 - 2014 TIBCO Software Inc. All rights reserved.
 * http://www.jaspersoft.com.
 *
 * Unless you have purchased  a commercial license agreement from Jaspersoft,
 * the following license terms  apply:
 *
 * This program is free software: you can redistribute it and/or  modify
 * it under the terms of the GNU Affero General Public License  as
 * published by the Free Software Foundation, either version 3 of  the
 * License, or (at your option) any later version.
 *
 * This program 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 Affero  General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public  License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
package com.jaspersoft.jasperserver.api.metadata.common.domain.util;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.zip.GZIPInputStream;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import com.jaspersoft.jasperserver.api.JSExceptionWrapper;
import com.jaspersoft.jasperserver.api.metadata.common.domain.DataContainer;

/**
 * @author Lucian Chirita (lucianc@users.sourceforge.net)
 * @version $Id: GzipDataContainer.java 47331 2014-07-18 09:13:06Z kklein $
 */
public class GzipDataContainer implements DataContainer {

    private static final Log log = LogFactory.getLog(GzipDataContainer.class);

    private final DataContainer decorated;

    private DataContainerStreamUtil.CompressedOutputStream compressedOut;
    private int uncompressedSize;

    public GzipDataContainer(DataContainer decorated) {
        this.decorated = decorated;
    }

    public GzipDataContainer(DataContainer decorated, int uncompressedSize) {
        this(decorated);
        this.uncompressedSize = uncompressedSize;
    }

    public boolean hasData() {
        return decorated.hasData();
    }

    public OutputStream getOutputStream() {
        if (compressedOut == null) {
            OutputStream out = decorated.getOutputStream();
            try {
                compressedOut = new DataContainerStreamUtil.CompressedOutputStream(out) {
                    @Override
                    public void close() throws IOException {
                        super.close();

                        // set the final uncompressed size
                        GzipDataContainer.this.uncompressedSize = getUncompressedSize();
                    }
                };
                return compressedOut;
            } catch (IOException e) {
                throw new JSExceptionWrapper(e);
            }
        }

        return compressedOut;
    }

    public int dataSize() {
        return uncompressedSize;
    }

    public InputStream getInputStream() {
        InputStream in = decorated.getInputStream();
        if (in == null) {
            return null;
        }

        try {
            return new GZIPInputStream(in);
        } catch (IOException e) {
            throw new JSExceptionWrapper(e);
        }
    }

    public byte[] getData() {
        return DataContainerStreamUtil.readDataAndClose(getInputStream());
    }

    public DataContainer getDecorated() {
        return decorated;
    }

    public void dispose() {
        if (compressedOut != null) {
            try {
                compressedOut.close();
            } catch (IOException e) {
                if (log.isDebugEnabled()) {
                    log.debug("Failed to close output stream", e);
                }
            }
        }

        decorated.dispose();
    }
}