annis.visualizers.iframe.WriterVisualizer Maven / Gradle / Ivy
/*
* Copyright 2009-2011 Collaborative Research Centre SFB 632
*
* 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 annis.visualizers.iframe;
import annis.libgui.visualizers.AbstractIFrameVisualizer;
import annis.libgui.visualizers.VisualizerInput;
import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.io.Writer;
import org.slf4j.LoggerFactory;
/**
* Implentation of Visualizer which uses Writers instead of OutputStream
* @author thomas
*/
public abstract class WriterVisualizer extends AbstractIFrameVisualizer
{
private static final org.slf4j.Logger log = LoggerFactory.getLogger(WriterVisualizer.class);
/**
* Will create a Writer of the outstream.
* @param outstream
*/
@Override
public void writeOutput(VisualizerInput input, OutputStream outstream)
{
try
{
OutputStreamWriter writer = new OutputStreamWriter(outstream, getCharacterEncoding());
writeOutput(input, writer);
writer.flush();
}
catch(IOException ex)
{
log.error("Exception when writing visualizer output.", ex);
StringWriter strWriter = new StringWriter();
ex.printStackTrace(new PrintWriter(strWriter));
try
{
outstream.write(strWriter.toString().getBytes("UTF-8"));
}
catch (IOException ex1)
{
log.error(null, ex);
}
}
}
/**
* Writes the final output to passed Wriiter. The writer should remain open.
* @param writer
*/
public abstract void writeOutput(VisualizerInput input, Writer writer);
}