001: /* ================================================================
002: * Cewolf : Chart enabling Web Objects Framework
003: * ================================================================
004: *
005: * Project Info: http://cewolf.sourceforge.net
006: * Project Lead: Guido Laures (guido@laures.de);
007: *
008: * (C) Copyright 2002, by Guido Laures
009: *
010: * This library is free software; you can redistribute it and/or modify it under the terms
011: * of the GNU Lesser General Public License as published by the Free Software Foundation;
012: * either version 2.1 of the License, or (at your option) any later version.
013: *
014: * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
015: * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
016: * See the GNU Lesser General Public License for more details.
017: *
018: * You should have received a copy of the GNU Lesser General Public License along with this
019: * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
020: * Boston, MA 02111-1307, USA.
021: */
022:
023: package de.laures.cewolf.taglib;
024:
025: import java.io.Serializable;
026: import java.util.Calendar;
027: import java.util.Date;
028: import java.util.GregorianCalendar;
029:
030: import org.apache.commons.logging.Log;
031: import org.apache.commons.logging.LogFactory;
032:
033: import de.laures.cewolf.CewolfException;
034: import de.laures.cewolf.ChartHolder;
035: import de.laures.cewolf.ChartImage;
036: import de.laures.cewolf.ChartValidationException;
037: import de.laures.cewolf.DatasetProduceException;
038: import de.laures.cewolf.PostProcessingException;
039: import de.laures.cewolf.event.ChartImageRenderListener;
040: import de.laures.cewolf.util.RenderedImage;
041: import de.laures.cewolf.util.Renderer;
042:
043: /**
044: * Serializable implementaton of a ChartImage.
045: * @author glaures
046: * @see de.laures.cewolf.ChartImage
047: */
048: public class ChartImageDefinition implements ChartImage, ChartHolder,
049: Serializable {
050:
051: private static final Log log = LogFactory
052: .getLog(ChartImageDefinition.class);
053:
054: private final ChartHolder chartHolder;
055: private final int height;
056: private final int width;
057: private final int type;
058: private final String mimeType;
059: transient private final Date timeoutTime;
060:
061: private RenderedImage renderedImage;
062:
063: /**
064: * Constructor for ChartImage
065: */
066: public ChartImageDefinition(ChartHolder ch, int width, int height,
067: int type, String mimeType, int timeout) {
068: if (width <= 0 || height <= 0) {
069: throw new IllegalArgumentException(
070: "ChartImage with height or width <= 0 is illegal");
071: }
072: this .chartHolder = ch;
073: this .width = width;
074: this .height = height;
075: this .type = type;
076: this .mimeType = mimeType;
077: Calendar cal = new GregorianCalendar();
078: cal.add(Calendar.SECOND, timeout);
079: this .timeoutTime = cal.getTime();
080: }
081:
082: /**
083: * Returns the height.
084: * @return int
085: */
086: public int getHeight() {
087: return height;
088: }
089:
090: /**
091: * Returns the width.
092: * @return int
093: */
094: public int getWidth() {
095: return width;
096: }
097:
098: public int getType() {
099: return type;
100: }
101:
102: public Object getChart() throws DatasetProduceException,
103: ChartValidationException, PostProcessingException {
104: return chartHolder.getChart();
105: }
106:
107: public Object getDataset() throws DatasetProduceException {
108: return chartHolder.getDataset();
109: }
110:
111: /**
112: * Returns the mimeType.
113: * @return String
114: */
115: public String getMimeType() {
116: return mimeType;
117: }
118:
119: /**
120: * @see java.lang.Object#finalize()
121: */
122: protected void finalize() throws Throwable {
123: super .finalize();
124: log.debug(this + " finalized.");
125: }
126:
127: /**
128: * @see de.laures.cewolf.ChartImage#getRenderingInfo()
129: */
130: public Object getRenderingInfo() throws CewolfException {
131: ensureRendered();
132: return renderedImage.renderingInfo;
133: }
134:
135: public byte[] getBytes() throws CewolfException {
136: ensureRendered();
137: return renderedImage.data;
138: }
139:
140: private void ensureRendered() throws CewolfException {
141: if (renderedImage == null) {
142: renderedImage = Renderer.render(this , chartHolder
143: .getChart());
144: onImageRendered(renderedImage);
145: }
146: }
147:
148: /**
149: * @see de.laures.cewolf.ChartImage#getSize()
150: */
151: public int getSize() throws CewolfException {
152: ensureRendered();
153: return renderedImage.data.length;
154: }
155:
156: /* (non-Javadoc)
157: * @see de.laures.cewolf.ChartImage#getTimeoutTime()
158: */
159: public Date getTimeoutTime() {
160: return timeoutTime;
161: }
162:
163: /**
164: * Implemented onImageRendered method.
165: * @see de.laures.cewolf.ChartHolder#onImageRendered(de.laures.cewolf.util.RenderedImage).
166: * @param renderedImage The image
167: */
168: private void onImageRendered(RenderedImage renderedImage) {
169: if (chartHolder instanceof ChartImageRenderListener) {
170: // delegate to chartHolder if it's interested...
171: ((ChartImageRenderListener) chartHolder)
172: .onImageRendered(renderedImage);
173: }
174: }
175:
176: }
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