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Java > Open Source Codes > de > laures > cewolf > taglib > ChartImageDefinition


1 /* ================================================================
2  * Cewolf : Chart enabling Web Objects Framework
3  * ================================================================
4  *
5  * Project Info: http://cewolf.sourceforge.net
6  * Project Lead: Guido Laures (guido@laures.de);
7  *
8  * (C) Copyright 2002, by Guido Laures
9  *
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.
13  *
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.
17  *
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.
21  */
22
23 package de.laures.cewolf.taglib;
24
25 import java.io.Serializable JavaDoc;
26 import java.util.Calendar JavaDoc;
27 import java.util.Date JavaDoc;
28 import java.util.GregorianCalendar JavaDoc;
29
30 import org.apache.commons.logging.Log;
31 import org.apache.commons.logging.LogFactory;
32
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;
42
43 /**
44  * Serializable implementaton of a ChartImage.
45  * @author glaures
46  * @see de.laures.cewolf.ChartImage
47  */
48 public class ChartImageDefinition implements ChartImage, ChartHolder, Serializable JavaDoc {
49     
50     private static final Log log = LogFactory.getLog(ChartImageDefinition.class);
51
52     private final ChartHolder chartHolder;
53     private final int height;
54     private final int width;
55     private final int type;
56     private final String JavaDoc mimeType;
57     transient private final Date JavaDoc timeoutTime;
58     
59     private RenderedImage renderedImage;
60
61     /**
62      * Constructor for ChartImage
63      */
64     public ChartImageDefinition(ChartHolder ch, int width, int height, int type, String JavaDoc mimeType, int timeout) {
65         if(width <= 0 || height <= 0){
66             throw new IllegalArgumentException JavaDoc("ChartImage with height or width <= 0 is illegal");
67         }
68         this.chartHolder = ch;
69         this.width = width;
70         this.height = height;
71         this.type = type;
72         this.mimeType = mimeType;
73     Calendar JavaDoc cal = new GregorianCalendar JavaDoc();
74     cal.add(Calendar.SECOND,timeout);
75     this.timeoutTime = cal.getTime();
76     }
77         
78     /**
79      * Returns the height.
80      * @return int
81      */
82     public int getHeight() {
83         return height;
84     }
85
86     /**
87      * Returns the width.
88      * @return int
89      */
90     public int getWidth() {
91         return width;
92     }
93
94     public int getType() {
95         return type;
96     }
97
98     public Object JavaDoc getChart() throws DatasetProduceException, ChartValidationException, PostProcessingException {
99         return chartHolder.getChart();
100     }
101
102     public Object JavaDoc getDataset() throws DatasetProduceException {
103         return chartHolder.getDataset();
104     }
105
106     /**
107      * Returns the mimeType.
108      * @return String
109      */
110     public String JavaDoc getMimeType() {
111         return mimeType;
112     }
113     
114     /**
115      * @see java.lang.Object#finalize()
116      */
117     protected void finalize() throws Throwable JavaDoc {
118         super.finalize();
119         log.debug(this + " finalized.");
120     }
121     
122     /**
123      * @see de.laures.cewolf.ChartImage#getRenderingInfo()
124      */
125     public Object JavaDoc getRenderingInfo() throws CewolfException {
126         ensureRendered();
127         return renderedImage.renderingInfo;
128     }
129     
130     public byte[] getBytes() throws CewolfException{
131         ensureRendered();
132         return renderedImage.data;
133     }
134     
135     private void ensureRendered() throws CewolfException{
136         if(renderedImage == null){
137             renderedImage = Renderer.render(this, chartHolder.getChart());
138             onImageRendered(renderedImage);
139         }
140     }
141
142     /**
143      * @see de.laures.cewolf.ChartImage#getSize()
144      */
145     public int getSize() throws CewolfException {
146         ensureRendered();
147         return renderedImage.data.length;
148     }
149
150     /* (non-Javadoc)
151      * @see de.laures.cewolf.ChartImage#getTimeoutTime()
152      */
153     public Date JavaDoc getTimeoutTime() {
154         return timeoutTime;
155     }
156
157     /**
158      * Implemented onImageRendered method.
159      * @see de.laures.cewolf.ChartHolder#onImageRendered(de.laures.cewolf.util.RenderedImage).
160      * @param renderedImage The image
161      */
162     private void onImageRendered(RenderedImage renderedImage) {
163         if (chartHolder instanceof ChartImageRenderListener) {
164             // delegate to chartHolder if it's interested...
165 ((ChartImageRenderListener) chartHolder).onImageRendered(renderedImage);
166         }
167     }
168
169 }
170
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