annis.visualizers.component.AbstractImageVisualizer.java Source code

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Here is the source code for annis.visualizers.component.AbstractImageVisualizer.java

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/*
 * 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 <krauseto@hu-berlin.de>
 */
public abstract class AbstractImageVisualizer extends AbstractVisualizer<ImagePanel> {
    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();

}