Source Code Cross Referenced for ImageModel.java in  » J2EE » Jaffa » org » jaffa » presentation » portlet » widgets » model » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » Jaffa » org.jaffa.presentation.portlet.widgets.model 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * ====================================================================
003:         * JAFFA - Java Application Framework For All
004:         *
005:         * Copyright (C) 2002 JAFFA Development Group
006:         *
007:         *     This library is free software; you can redistribute it and/or
008:         *     modify it under the terms of the GNU Lesser General Public
009:         *     License as published by the Free Software Foundation; either
010:         *     version 2.1 of the License, or (at your option) any later version.
011:         *
012:         *     This library is distributed in the hope that it will be useful,
013:         *     but WITHOUT ANY WARRANTY; without even the implied warranty of
014:         *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
015:         *     Lesser General Public License for more details.
016:         *
017:         *     You should have received a copy of the GNU Lesser General Public
018:         *     License along with this library; if not, write to the Free Software
019:         *     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
020:         *
021:         * Redistribution and use of this software and associated documentation ("Software"),
022:         * with or without modification, are permitted provided that the following conditions are met:
023:         * 1.	Redistributions of source code must retain copyright statements and notices.
024:         *         Redistributions must also contain a copy of this document.
025:         * 2.	Redistributions in binary form must reproduce the above copyright notice,
026:         * 	this list of conditions and the following disclaimer in the documentation
027:         * 	and/or other materials provided with the distribution.
028:         * 3.	The name "JAFFA" must not be used to endorse or promote products derived from
029:         * 	this Software without prior written permission. For written permission,
030:         * 	please contact mail to: jaffagroup@yahoo.com.
031:         * 4.	Products derived from this Software may not be called "JAFFA" nor may "JAFFA"
032:         * 	appear in their names without prior written permission.
033:         * 5.	Due credit should be given to the JAFFA Project (http://jaffa.sourceforge.net).
034:         *
035:         * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESSED OR IMPLIED
036:         * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
037:         * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
038:         * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
039:         * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
040:         * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
041:         * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
042:         * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
043:         * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
044:         * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
045:         * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
046:         * SUCH DAMAGE.
047:         * ====================================================================
048:         */
049:
050:        package org.jaffa.presentation.portlet.widgets.model;
051:
052:        import org.apache.log4j.*;
053:        import java.util.*;
054:        import java.io.*;
055:        import org.jaffa.presentation.portlet.widgets.model.exceptions.IllegalExtensionRuntimeException;
056:        import org.jaffa.config.Config;
057:
058:        /** Model for the Image widget. This will keep the image in memory by default.
059:         * This can however be modified to store the image in a temporary folder on the filesystem.
060:         */
061:        public class ImageModel extends WidgetModel {
062:
063:            private static Logger log = Logger.getLogger(ImageModel.class);
064:
065:            private static final boolean KEEP_IN_MEMORY = true;
066:            private static final String WEB_SERVER_ROOT = (String) Config
067:                    .getProperty(Config.PROP_WEB_SERVER_ROOT);
068:            private static final String WEB_TEMP_DIR = "jaffa/imgs/temp/";
069:            private static final HashMap MIME_TYPES = new HashMap();
070:            static {
071:                MIME_TYPES.put("gif", "image/gif");
072:                MIME_TYPES.put("png", "image/x-png");
073:                MIME_TYPES.put("jpeg", "image/jpeg");
074:                MIME_TYPES.put("jpg", "image/jpeg");
075:                MIME_TYPES.put("jpe", "image/jpeg");
076:                MIME_TYPES.put("bmp", "image/x-ms-bmp");
077:                MIME_TYPES.put("tif", "image/tiff");
078:                MIME_TYPES.put("tiff", "image/tiff");
079:            }
080:            private static final String DEFAULT_EXTENTION = "gif";
081:
082:            private String m_extention = null;
083:            private byte[] m_image = null; // Image data if kept in memory
084:            private File m_file = null; // Image file if stored on disk
085:
086:            /** Create a new image model. The default image type is GIF.
087:             * @param image The image.
088:             */
089:            public ImageModel(byte[] image) {
090:                this (image, null);
091:            }
092:
093:            /** Create a new Image Model specifying the image type (if null, GIF is assumed).
094:             * Currently suppoted image types are : gif,png,jpeg,jpg,jpe,bmp,tif,tiff.
095:             * This will throw an IllegalExtensionRuntimeException if any other extention is passed.
096:             * @param image The image.
097:             * @param extention The image type.
098:             */
099:            public ImageModel(byte[] image, String extention) {
100:
101:                // ensure a valid extension
102:                if (extention != null) {
103:                    // Convert to lower case
104:                    extention = extention.toLowerCase();
105:
106:                    // Look up extention and see if it is supported
107:                    if (MIME_TYPES.get(extention) == null) {
108:                        String str = "Image Type Not Supported : " + extention;
109:                        log.error(str);
110:                        throw new IllegalExtensionRuntimeException(str);
111:                    }
112:                    m_extention = extention;
113:                } else {
114:                    m_extention = DEFAULT_EXTENTION;
115:                }
116:
117:                // Store image based on storage method (Memory / Disk)
118:                if (KEEP_IN_MEMORY) {
119:                    m_image = image;
120:                } else {
121:                    try {
122:                        String dirName = null;
123:                        if (WEB_SERVER_ROOT.endsWith(File.separator))
124:                            dirName = WEB_SERVER_ROOT + WEB_TEMP_DIR;
125:                        else
126:                            dirName = WEB_SERVER_ROOT + File.separatorChar
127:                                    + WEB_TEMP_DIR;
128:
129:                        m_file = File.createTempFile("img_", "." + m_extention,
130:                                new File(dirName));
131:                        if (log.isDebugEnabled())
132:                            log.debug("Temp Img File : " + m_file.toString());
133:
134:                        // Set this incase the finalize block doesn't get executed.
135:                        m_file.deleteOnExit();
136:
137:                        OutputStream out = new BufferedOutputStream(
138:                                new FileOutputStream(m_file));
139:                        out.write(image);
140:                        out.close();
141:                    } catch (IOException e) {
142:                        // log the error & continue as if InMemory is true
143:                        log
144:                                .warn(
145:                                        "Can't Write Out Image : "
146:                                                + e.getMessage()
147:                                                + "\n Temp Dir :"
148:                                                + WEB_SERVER_ROOT
149:                                                + WEB_TEMP_DIR
150:                                                + "\nContinued execution, with the image kept in memory",
151:                                        e);
152:
153:                        // delete the file
154:                        if (m_file != null) {
155:                            m_file.delete();
156:                            m_file = null;
157:                        }
158:                        m_image = image;
159:                    }
160:                }
161:            }
162:
163:            /** Getter for property mimeType.
164:             * @return Value of property mimeType.
165:             */
166:            public String getMimeType() {
167:                return (String) MIME_TYPES.get(m_extention);
168:            }
169:
170:            /** Getter for property extension (image type).
171:             * @return Value of property extension (image type).
172:             */
173:            public String getExtention() {
174:                return m_extention;
175:            }
176:
177:            /** Returns the URL to access the image relative of the web server.
178:             * @return the URL to access the image relative of the web server.
179:             */
180:            public String getImageUrl() {
181:                if (m_file != null)
182:                    return WEB_TEMP_DIR + m_file.getName();
183:                else
184:                    return null;
185:            }
186:
187:            /** Get the byte array for the image.
188:             * This may be in-memory, or read in from disk.
189:             * @throws IOException if any error occurs in reading the image from the filesystem.
190:             * @return the byte array for the image.
191:             */
192:            public byte[] getImage() throws IOException {
193:                byte[] image = null;
194:
195:                if (m_image != null) {
196:                    // Return In-Memory Image
197:                    image = m_image;
198:                } else {
199:                    if (m_file != null) {
200:                        // Read from file
201:                        InputStream stream = new BufferedInputStream(
202:                                new FileInputStream(m_file));
203:                        image = new byte[stream.available()];
204:                        stream.read(image);
205:                        stream.close();
206:                    }
207:                }
208:                return image;
209:            }
210:
211:            /** This will ensure that the temporary file (if created) gets deleted.
212:             */
213:            public void finalize() {
214:                if (m_file != null) {
215:                    try {
216:                        m_file.delete();
217:                    } catch (SecurityException e) {
218:                        // do nothing
219:                    }
220:                }
221:            }
222:
223:        }
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