Source Code Cross Referenced for PropertyMessageResources.java in  » J2EE » Jaffa » org » jaffa » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » Jaffa » org.jaffa.util 
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.util;
051:
052:        import java.io.*;
053:        import java.util.*;
054:        import org.apache.struts.util.MessageResourcesFactory;
055:
056:        /**
057:         * Concrete subclass of <code>MessageResources</code> that reads message keys
058:         * and corresponding strings from named property resources in the same manner
059:         * that java.util.PropertyResourceBundle does. The
060:         * base property defines the base property resource name, and
061:         * must be specified.
062:         *
063:         * IMPLEMENTATION NOTE - This class trades memory for
064:         * speed by caching all messages located via generalizing the Locale under
065:         * the original locale as well.
066:         * This results in specific messages being stored in the message cache
067:         * more than once, but improves response time on subsequent requests for
068:         * the same locale + key combination.
069:         *
070:         * This class is based on the struts class org.apache.struts.util.PropertyMessageResources
071:         * It loads the properties file using File I/O. This allows us to view the changes to the file, without having to reload the webapp.
072:         * It supports the flushing of the message-resource cache.
073:         * @author  GautamJ
074:         */
075:        public class PropertyMessageResources extends
076:                org.apache.struts.util.PropertyMessageResources {
077:
078:            /**
079:             * Construct a new PropertyMessageResources according to the
080:             * specified parameters.
081:             *
082:             * @param factory The MessageResourcesFactory that created us
083:             * @param config The configuration parameter for this MessageResources
084:             */
085:            public PropertyMessageResources(MessageResourcesFactory factory,
086:                    String config) {
087:                super (factory, config);
088:            }
089:
090:            /**
091:             * Construct a new PropertyMessageResources according to the
092:             * specified parameters.
093:             *
094:             * @param factory The MessageResourcesFactory that created us
095:             * @param config The configuration parameter for this MessageResources
096:             * @param returnNull The returnNull property we should initialize with
097:             */
098:            public PropertyMessageResources(MessageResourcesFactory factory,
099:                    String config, boolean returnNull) {
100:                super (factory, config, returnNull);
101:            }
102:
103:            /** This method flushes the cache that holds all the messages read from the resource.
104:             */
105:            public synchronized void flushCache() {
106:                synchronized (super .formats) {
107:                    super .formats.clear();
108:                }
109:                synchronized (super .messages) {
110:                    super .messages.clear();
111:                }
112:                super .locales.clear();
113:            }
114:
115:            /** This method is a copy of the implementation in the base class
116:             * The only difference is that it tries to first load the properties file using File I/O; if that doesn't work, then it uses the ClassLoader to load the file.
117:             *
118:             * Load the messages associated with the specified Locale key.  For this
119:             * implementation, the <code>config</code> property should contain a fully
120:             * qualified package and resource name, separated by periods, of a series
121:             * of property resources to be loaded from the class loader that created
122:             * this PropertyMessageResources instance.  This is exactly the same name
123:             * format you would use when utilizing the
124:             * <code>java.util.PropertyResourceBundle</code> class.
125:             *
126:             * @param localeKey Locale key for the messages to be retrieved
127:             */
128:            protected synchronized void loadLocale(String localeKey) {
129:
130:                if (log.isTraceEnabled()) {
131:                    log.trace("loadLocale(" + localeKey + ")");
132:                }
133:
134:                // Have we already attempted to load messages for this locale?
135:                if (locales.get(localeKey) != null) {
136:                    return;
137:                }
138:                locales.put(localeKey, localeKey);
139:
140:                // Set up to load the property resource for this locale key, if we can
141:                String name = config.replace('.', '/');
142:                if (localeKey.length() > 0) {
143:                    name += "_" + localeKey;
144:                }
145:                name += ".properties";
146:                InputStream is = null;
147:                Properties props = new Properties();
148:
149:                // Load the specified property resource
150:                if (log.isTraceEnabled()) {
151:                    log.trace("  Loading resource '" + name + "'");
152:                }
153:
154:                //ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
155:                //if (classLoader == null) {
156:                //classLoader = this.getClass().getClassLoader();
157:                //}
158:                //is = classLoader.getResourceAsStream(name);
159:
160:                // Try to load the file using ClassLoader.getResource(name).openStream()
161:                // This allows us to view the changes to the file, without having to reload the webapp
162:                try {
163:                    is = URLHelper.getInputStream(name);
164:                } catch (Exception e) {
165:                    log.error("loadLocale()", e);
166:                }
167:
168:                if (is != null) {
169:                    try {
170:                        props.load(is);
171:
172:                    } catch (IOException e) {
173:                        log.error("loadLocale()", e);
174:                    } finally {
175:                        try {
176:                            is.close();
177:                        } catch (IOException e) {
178:                            log.error("loadLocale()", e);
179:                        }
180:                    }
181:                }
182:
183:                if (log.isTraceEnabled()) {
184:                    log.trace("  Loading resource completed");
185:                }
186:
187:                // Copy the corresponding values into our cache
188:                if (props.size() < 1) {
189:                    return;
190:                }
191:
192:                synchronized (messages) {
193:                    Iterator names = props.keySet().iterator();
194:                    while (names.hasNext()) {
195:                        String key = (String) names.next();
196:                        if (log.isTraceEnabled()) {
197:                            log.trace("  Saving message key '"
198:                                    + messageKey(localeKey, key));
199:                        }
200:                        messages.put(messageKey(localeKey, key), props
201:                                .getProperty(key));
202:                    }
203:                }
204:
205:            }
206:
207:        }
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