ch.goodsolutions.olat.jfreechart.JFreeChartMediaResource.java Source code

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Here is the source code for ch.goodsolutions.olat.jfreechart.JFreeChartMediaResource.java

Source

/**
 * JGS goodsolutions GmbH<br>
 * http://www.goodsolutions.ch
 * <p>
 * This software is protected by the goodsolutions software license.<br>
 * <p>
 * Copyright (c) 2005-2006 by JGS goodsolutions GmbH, Switzerland.<br>
 * All rights reserved.
 * <p>
 */
package ch.goodsolutions.olat.jfreechart;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;

import javax.servlet.http.HttpServletResponse;

import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
import org.olat.core.gui.media.MediaResource;

/**
 * Description:<br>
 * TODO: Mike Stock Class Description for JFreeChartMediaResource
 * <P>
 * Initial Date: 18.04.2006 <br>
 * 
 * @author Mike Stock
 */
public class JFreeChartMediaResource implements MediaResource {

    private static final String CONTENT_TYPE = "image/png";
    private static final Long UNDEF_SIZE = new Long(-1);
    private static final Long UNDEF_LAST_MODIFIED = new Long(-1);

    private final JFreeChart chart;
    private final Long width, height;

    public JFreeChartMediaResource(final JFreeChart chart, final Long width, final Long height) {
        this.chart = chart;
        this.width = width;
        this.height = height;
    }

    /**
     * @see org.olat.core.gui.media.MediaResource#getContentType()
     */
    @Override
    public String getContentType() {
        return CONTENT_TYPE;
    }

    /**
     * @see org.olat.core.gui.media.MediaResource#getSize()
     */
    @Override
    public Long getSize() {
        return UNDEF_SIZE;
    }

    /**
     * @see org.olat.core.gui.media.MediaResource#getInputStream()
     */
    @Override
    public InputStream getInputStream() {
        ByteArrayInputStream pIn = null;
        try {
            final ByteArrayOutputStream pOut = new ByteArrayOutputStream();
            ChartUtilities.writeChartAsPNG(pOut, chart, width.intValue(), height.intValue());
            pIn = new ByteArrayInputStream(pOut.toByteArray());
        } catch (final IOException e) {
            // bummer...
        }
        return pIn;
    }

    /**
     * @see org.olat.core.gui.media.MediaResource#getLastModified()
     */
    @Override
    public Long getLastModified() {
        return UNDEF_LAST_MODIFIED;
    }

    /**
     * @see org.olat.core.gui.media.MediaResource#prepare(javax.servlet.http.HttpServletResponse)
     */
    @Override
    public void prepare(final HttpServletResponse hres) {
        // nothing to do...
    }

    /**
     * @see org.olat.core.gui.media.MediaResource#release()
     */
    @Override
    public void release() {
        // nothing to do...
    }

}