annis.visualizers.component.AbstractImageVisualizer Maven / Gradle / Ivy
/*
* Copyright 2013 Corpuslinguistic working group Humboldt University Berlin.
*
* 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.component;
import annis.libgui.ImagePanel;
import annis.libgui.VisualizationToggle;
import annis.libgui.visualizers.AbstractVisualizer;
import annis.libgui.visualizers.VisualizerInput;
import com.vaadin.server.StreamResource;
import com.vaadin.ui.Embedded;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.UUID;
import org.slf4j.LoggerFactory;
/**
*
* @author Thomas Krause
*/
public abstract class AbstractImageVisualizer extends AbstractVisualizer
{
private static final org.slf4j.Logger log = LoggerFactory.getLogger(AbstractImageVisualizer.class);
@Override
public ImagePanel createComponent(final VisualizerInput visInput, VisualizationToggle visToggle)
{
final ByteArrayOutputStream out = new ByteArrayOutputStream();
writeOutput(visInput, out);
String fileName = "vis_" + UUID.randomUUID().toString() + ".png";
StreamResource resource = new StreamResource(new StreamResource.StreamSource()
{
@Override
public InputStream getStream()
{
return new ByteArrayInputStream(out.toByteArray());
}
}, fileName);
Embedded emb = new Embedded("", resource);
emb.setMimeType(getContentType());
emb.setSizeUndefined();
emb.setStandby("loading image");
emb.setAlternateText("Visualization of the result");
return new ImagePanel(emb);
}
public abstract void writeOutput(VisualizerInput input, OutputStream outstream);
public abstract String getContentType();
}