/* ================================================================

 * 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 || height <= 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);

		}

	}

}