/
TripleWriter.java
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/
TripleWriter.java
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/*
* Copyright 2013, 2014 Deutsche Nationalbibliothek
*
* 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
*
* http://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.metafacture.triples;
import org.metafacture.framework.FluxCommand;
import org.metafacture.framework.MetafactureException;
import org.metafacture.framework.annotations.Description;
import org.metafacture.framework.annotations.In;
import org.metafacture.framework.annotations.Out;
import org.metafacture.framework.helpers.DefaultObjectReceiver;
import org.metafacture.framework.objects.Triple;
import java.io.BufferedOutputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectOutputStream;
/**
* @author Christoph Böhme
*
*/
@Description("Writes triples into a file.")
@In(Triple.class)
@Out(Void.class)
@FluxCommand("write-triples")
public final class TripleWriter extends DefaultObjectReceiver<Triple> {
public static final int BUFFERSIZE = 2048;
private final String filename;
private ObjectOutputStream outputStream;
/**
* Constructs a TripleWriter with a given file name as output path.
*
* @param filename the name of the file to write to
*/
public TripleWriter(final String filename) {
this.filename = filename;
resetStream();
}
@Override
public void process(final Triple obj) {
try {
obj.write(outputStream);
}
catch (final IOException e) {
throw new MetafactureException(e);
}
}
@Override
public void resetStream() {
try {
if (outputStream != null) {
outputStream.close();
}
outputStream = new ObjectOutputStream(new BufferedOutputStream(new FileOutputStream(filename), BUFFERSIZE));
}
catch (final IOException e) {
throw new MetafactureException(e);
}
}
@Override
public void closeStream() {
try {
if (outputStream != null) {
outputStream.close();
}
}
catch (final IOException e) {
throw new MetafactureException(e);
}
}
}