1 /* ================================================================
2 * Cewolf : Chart enabling Web Objects Framework
3 * ================================================================
5 * Project Info: http://cewolf.sourceforge.net
6 * Project Lead: Guido Laures (guido@laures.de);
8 * (C) Copyright 2002, by Guido Laures
10 * This library is free software; you can redistribute it and/or modify it under the terms
11 * of the GNU Lesser General Public License as published by the Free Software Foundation;
12 * either version 2.1 of the License, or (at your option) any later version.
14 * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
15 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
16 * See the GNU Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public License along with this
19 * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
20 * Boston, MA 02111-1307, USA.
23 package de.laures.cewolf.taglib;
25 import java.io.Serializable;
26 import java.util.Calendar;
27 import java.util.Date;
28 import java.util.GregorianCalendar;
30 import org.apache.commons.logging.Log;
31 import org.apache.commons.logging.LogFactory;
33 import de.laures.cewolf.CewolfException;
34 import de.laures.cewolf.ChartHolder;
35 import de.laures.cewolf.ChartImage;
36 import de.laures.cewolf.ChartValidationException;
37 import de.laures.cewolf.DatasetProduceException;
38 import de.laures.cewolf.PostProcessingException;
39 import de.laures.cewolf.event.ChartImageRenderListener;
40 import de.laures.cewolf.util.RenderedImage;
41 import de.laures.cewolf.util.Renderer;
44 * Serializable implementaton of a ChartImage.
46 * @see de.laures.cewolf.ChartImage
48 public class ChartImageDefinition implements ChartImage, ChartHolder, Serializable {
50 private static final Log log = LogFactory.getLog(ChartImageDefinition.class);
52 private final ChartHolder chartHolder;
53 private final int height;
54 private final int width;
55 private final int type;
56 private final String mimeType;
57 transient private final Date timeoutTime;
59 private RenderedImage renderedImage;
62 * Constructor for ChartImage
64 public ChartImageDefinition(ChartHolder ch, int width, int height, int type, String mimeType, int timeout) {
65 if(width <= 0 || height <= 0){
66 throw new IllegalArgumentException("ChartImage with height or width <= 0 is illegal");
68 this.chartHolder = ch;
72 this.mimeType = mimeType;
73 Calendar cal = new GregorianCalendar();
74 cal.add(Calendar.SECOND,timeout);
75 this.timeoutTime = cal.getTime();
82 public int getHeight() {
90 public int getWidth() {
94 public int getType() {
98 public Object getChart() throws DatasetProduceException, ChartValidationException, PostProcessingException {
99 return chartHolder.getChart();
102 public Object getDataset() throws DatasetProduceException {
103 return chartHolder.getDataset();
107 * Returns the mimeType.
110 public String getMimeType() {
115 * @see java.lang.Object#finalize()
117 protected void finalize() throws Throwable {
119 log.debug(this + " finalized.");
123 * @see de.laures.cewolf.ChartImage#getRenderingInfo()
125 public Object getRenderingInfo() throws CewolfException {
127 return renderedImage.renderingInfo;
130 public byte[] getBytes() throws CewolfException{
132 return renderedImage.data;
135 private void ensureRendered() throws CewolfException{
136 if(renderedImage == null){
137 renderedImage = Renderer.render(this, chartHolder.getChart());
138 onImageRendered(renderedImage);
143 * @see de.laures.cewolf.ChartImage#getSize()
145 public int getSize() throws CewolfException {
147 return renderedImage.data.length;
151 * @see de.laures.cewolf.ChartImage#getTimeoutTime()
153 public Date getTimeoutTime() {
158 * Implemented onImageRendered method.
159 * @see de.laures.cewolf.ChartHolder#onImageRendered(de.laures.cewolf.util.RenderedImage).
160 * @param renderedImage The image
162 private void onImageRendered(RenderedImage renderedImage) {
163 if (chartHolder instanceof ChartImageRenderListener) {
164 // delegate to chartHolder if it's interested...
165 ((ChartImageRenderListener) chartHolder).onImageRendered(renderedImage);