/*
* ------------------------------------------------------------------------
*
* Copyright (C) 2003 - 2015
* University of Konstanz, Germany and
* KNIME GmbH, Konstanz, Germany
* Website: http://www.knime.org; Email: contact@knime.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, Version 3, as
* published by the Free Software Foundation.
*
* 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 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>.
*
* Additional permission under GNU GPL version 3 section 7:
*
* KNIME interoperates with ECLIPSE solely via ECLIPSE's plug-in APIs.
* Hence, KNIME and ECLIPSE are both independent programs and are not
* derived from each other. Should, however, the interpretation of the
* GNU GPL Version 3 ("License") under any applicable laws result in
* KNIME and ECLIPSE being a combined program, KNIME GMBH herewith grants
* you the additional permission to use and propagate KNIME together with
* ECLIPSE with only the license terms in place for ECLIPSE applying to
* ECLIPSE and the GNU GPL Version 3 applying for KNIME, provided the
* license terms of ECLIPSE themselves allow for the respective use and
* propagation of ECLIPSE together with KNIME.
*
* Additional permission relating to nodes for KNIME that extend the Node
* Extension (and in particular that are based on subclasses of NodeModel,
* NodeDialog, and NodeView) and that only interoperate with KNIME through
* standard APIs ("Nodes"):
* Nodes are deemed to be separate and independent programs and to not be
* covered works. Notwithstanding anything to the contrary in the
* License, the License does not apply to Nodes, you are not required to
* license Nodes under the License, and you are granted a license to
* prepare and propagate Nodes, in each case even if such Nodes are
* propagated with or for interoperation with KNIME. The owner of a Node
* may freely choose the license terms applicable to such Node, including
* when such Node is propagated with or for interoperation with KNIME.
* ---------------------------------------------------------------------
*
* Created on Oct 9, 2015 by dietzc
*/
package org.knime.knip.base.data;
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 java.util.zip.ZipOutputStream;
import org.knime.knip.base.KNIPConstants;
import org.knime.knip.core.io.externalization.BufferedDataInputStream;
import org.knime.knip.core.io.externalization.BufferedDataOutputStream;
/**
* Util class for handling streams used by cell implementations.
*
* @author Christian Dietz, University of Konstanz
*/
public class StreamUtil {
/**
* Helper to create the respective input stream (e.g. if zip file or not)
*/
public static BufferedDataInputStream createInputStream(final File f, final long offset) throws IOException {
BufferedDataInputStream stream = null;
try {
if (f.getName().endsWith(KNIPConstants.ZIP_SUFFIX)) {
final FileInputStream fileInput = new FileInputStream(f);
fileInput.skip(offset);
final ZipInputStream zip = new ZipInputStream(fileInput);
zip.getNextEntry();
stream = new BufferedDataInputStream(zip);
} else {
stream = new BufferedDataInputStream(new FileInputStream(f));
stream.skip(offset);
}
} catch (IOException e) {
if (stream != null) {
stream.close();
}
throw e;
}
return stream;
}
/**
* Helper to create the respective output stream (e.g. if zip file or not)
*/
public static BufferedDataOutputStream createOutStream(final File file) throws FileNotFoundException, IOException {
BufferedDataOutputStream stream;
if (file.getName().endsWith(KNIPConstants.ZIP_SUFFIX)) {
final ZipOutputStream zip = new ZipOutputStream(new FileOutputStream(file, true));
zip.putNextEntry(new ZipEntry("img"));
stream = new BufferedDataOutputStream(zip);
} else {
stream = new BufferedDataOutputStream(new FileOutputStream(file, true));
}
return stream;
}
}