de.laures.cewolf.taglib.ChartImageDefinition.java Source code

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Here is the source code for de.laures.cewolf.taglib.ChartImageDefinition.java

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/* ================================================================
 * Cewolf : Chart enabling Web Objects Framework
 * ================================================================
 *
 * Project Info:  http://cewolf.sourceforge.net
 * Project Lead:  Guido Laures (guido@laures.de);
 *
 * (C) Copyright 2002, by Guido Laures
 *
 * This library is free software; you can redistribute it and/or modify it under the terms
 * of the GNU Lesser General Public License as published by the Free Software Foundation;
 * either version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License along with this
 * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307, USA.
 */

package de.laures.cewolf.taglib;

import java.io.Serializable;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import de.laures.cewolf.CewolfException;
import de.laures.cewolf.ChartHolder;
import de.laures.cewolf.ChartImage;
import de.laures.cewolf.ChartValidationException;
import de.laures.cewolf.DatasetProduceException;
import de.laures.cewolf.PostProcessingException;
import de.laures.cewolf.event.ChartImageRenderListener;
import de.laures.cewolf.util.RenderedImage;
import de.laures.cewolf.util.Renderer;

/**
 * Serializable implementaton of a ChartImage.
 * @author glaures
 * @see de.laures.cewolf.ChartImage
 */
public class ChartImageDefinition implements ChartImage, ChartHolder, Serializable {

    private static final Log log = LogFactory.getLog(ChartImageDefinition.class);

    private final ChartHolder chartHolder;
    private final int height;
    private final int width;
    private final int type;
    private final String mimeType;
    transient private final Date timeoutTime;

    private RenderedImage renderedImage;

    /**
     * Constructor for ChartImage
     */
    public ChartImageDefinition(ChartHolder ch, int width, int height, int type, String mimeType, int timeout) {
        if (width <= 0) {
            throw new IllegalArgumentException("ChartImage with height or width <= 0 is illegal");
        }
        this.chartHolder = ch;
        this.width = width;
        this.height = height;
        this.type = type;
        this.mimeType = mimeType;
        Calendar cal = new GregorianCalendar();
        cal.add(Calendar.SECOND, timeout);
        this.timeoutTime = cal.getTime();
    }

    /**
     * Returns the height.
     * @return int
     */
    public int getHeight() {
        return height;
    }

    /**
     * Returns the width.
     * @return int
     */
    public int getWidth() {
        return width;
    }

    public int getType() {
        return type;
    }

    public Object getChart() throws DatasetProduceException, ChartValidationException, PostProcessingException {
        return chartHolder.getChart();
    }

    public Object getDataset() throws DatasetProduceException {
        return chartHolder.getDataset();
    }

    /**
     * Returns the mimeType.
     * @return String
     */
    public String getMimeType() {
        return mimeType;
    }

    /**
     * @see java.lang.Object#finalize()
     */
    protected void finalize() throws Throwable {
        super.finalize();
        log.debug(this + " finalized.");
    }

    /**
     * @see de.laures.cewolf.ChartImage#getRenderingInfo()
     */
    public Object getRenderingInfo() throws CewolfException {
        ensureRendered();
        return renderedImage.renderingInfo;
    }

    public byte[] getBytes() throws CewolfException {
        ensureRendered();
        return renderedImage.data;
    }

    private void ensureRendered() throws CewolfException {
        if (renderedImage == null) {
            renderedImage = Renderer.render(this, chartHolder.getChart());
            onImageRendered(renderedImage);
        }
    }

    /**
     * @see de.laures.cewolf.ChartImage#getSize()
     */
    public int getSize() throws CewolfException {
        ensureRendered();
        return renderedImage.data.length;
    }

    /* (non-Javadoc)
     * @see de.laures.cewolf.ChartImage#getTimeoutTime()
     */
    public Date getTimeoutTime() {
        return timeoutTime;
    }

    /**
     * Implemented onImageRendered method.
     * @see de.laures.cewolf.ChartHolder#onImageRendered(de.laures.cewolf.util.RenderedImage).
     * @param renderedImage The image
     */
    private void onImageRendered(RenderedImage renderedImage) {
        if (chartHolder instanceof ChartImageRenderListener) {
            // delegate to chartHolder if it's interested...
            ((ChartImageRenderListener) chartHolder).onImageRendered(renderedImage);
        }
    }

}