Source Code Cross Referenced for StringManager.java in  » Web-Server » Rimfaxe-Web-Server » org » apache » naming » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Web Server » Rimfaxe Web Server » org.apache.naming 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * $Header: /home/cvs/jakarta-tomcat-4.0/catalina/src/share/org/apache/naming/StringManager.java,v 1.1 2000/11/02 06:14:16 remm Exp $
003:         * $Revision: 1.1 $
004:         * $Date: 2000/11/02 06:14:16 $
005:         *
006:         * ====================================================================
007:         *
008:         * The Apache Software License, Version 1.1
009:         *
010:         * Copyright (c) 1999 The Apache Software Foundation.  All rights 
011:         * reserved.
012:         *
013:         * Redistribution and use in source and binary forms, with or without
014:         * modification, are permitted provided that the following conditions
015:         * are met:
016:         *
017:         * 1. Redistributions of source code must retain the above copyright
018:         *    notice, this list of conditions and the following disclaimer. 
019:         *
020:         * 2. Redistributions in binary form must reproduce the above copyright
021:         *    notice, this list of conditions and the following disclaimer in
022:         *    the documentation and/or other materials provided with the
023:         *    distribution.
024:         *
025:         * 3. The end-user documentation included with the redistribution, if
026:         *    any, must include the following acknowlegement:  
027:         *       "This product includes software developed by the 
028:         *        Apache Software Foundation (http://www.apache.org/)."
029:         *    Alternately, this acknowlegement may appear in the software itself,
030:         *    if and wherever such third-party acknowlegements normally appear.
031:         *
032:         * 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
033:         *    Foundation" must not be used to endorse or promote products derived
034:         *    from this software without prior written permission. For written 
035:         *    permission, please contact apache@apache.org.
036:         *
037:         * 5. Products derived from this software may not be called "Apache"
038:         *    nor may "Apache" appear in their names without prior written
039:         *    permission of the Apache Group.
040:         *
041:         * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
042:         * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
043:         * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
044:         * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
045:         * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
046:         * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
047:         * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
048:         * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
049:         * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
050:         * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
051:         * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
052:         * SUCH DAMAGE.
053:         * ====================================================================
054:         *
055:         * This software consists of voluntary contributions made by many
056:         * individuals on behalf of the Apache Software Foundation.  For more
057:         * information on the Apache Software Foundation, please see
058:         * <http://www.apache.org/>.
059:         *
060:         * [Additional notices, if required by prior licensing conditions]
061:         *
062:         */
063:
064:        package org.apache.naming;
065:
066:        import java.text.MessageFormat;
067:        import java.util.Hashtable;
068:        import java.util.Locale;
069:        import java.util.MissingResourceException;
070:        import java.util.ResourceBundle;
071:
072:        /**
073:         * An internationalization / localization helper class which reduces
074:         * the bother of handling ResourceBundles and takes care of the
075:         * common cases of message formating which otherwise require the
076:         * creation of Object arrays and such.
077:         *
078:         * <p>The StringManager operates on a package basis. One StringManager
079:         * per package can be created and accessed via the getManager method
080:         * call.
081:         *
082:         * <p>The StringManager will look for a ResourceBundle named by
083:         * the package name given plus the suffix of "LocalStrings". In
084:         * practice, this means that the localized information will be contained
085:         * in a LocalStrings.properties file located in the package
086:         * directory of the classpath.
087:         *
088:         * <p>Please see the documentation for java.util.ResourceBundle for
089:         * more information.
090:         *
091:         * @author James Duncan Davidson [duncan@eng.sun.com]
092:         * @author James Todd [gonzo@eng.sun.com]
093:         */
094:
095:        public class StringManager {
096:
097:            /**
098:             * The ResourceBundle for this StringManager.
099:             */
100:
101:            private ResourceBundle bundle;
102:
103:            /**
104:             * Creates a new StringManager for a given package. This is a
105:             * private method and all access to it is arbitrated by the
106:             * static getManager method call so that only one StringManager
107:             * per package will be created.
108:             *
109:             * @param packageName Name of package to create StringManager for.
110:             */
111:
112:            private StringManager(String packageName) {
113:                String bundleName = packageName + ".LocalStrings";
114:                bundle = ResourceBundle.getBundle(bundleName);
115:            }
116:
117:            /**
118:             * Get a string from the underlying resource bundle.
119:             *
120:             * @param key 
121:             */
122:
123:            public String getString(String key) {
124:                if (key == null) {
125:                    String msg = "key is null";
126:
127:                    throw new NullPointerException(msg);
128:                }
129:
130:                String str = null;
131:
132:                try {
133:                    str = bundle.getString(key);
134:                } catch (MissingResourceException mre) {
135:                    str = "Cannot find message associated with key '" + key
136:                            + "'";
137:                }
138:
139:                return str;
140:            }
141:
142:            /**
143:             * Get a string from the underlying resource bundle and format
144:             * it with the given set of arguments.
145:             *
146:             * @param key
147:             * @param args
148:             */
149:
150:            public String getString(String key, Object[] args) {
151:                String iString = null;
152:                String value = getString(key);
153:
154:                // this check for the runtime exception is some pre 1.1.6
155:                // VM's don't do an automatic toString() on the passed in
156:                // objects and barf out
157:
158:                try {
159:                    // ensure the arguments are not null so pre 1.2 VM's don't barf
160:                    Object nonNullArgs[] = args;
161:                    for (int i = 0; i < args.length; i++) {
162:                        if (args[i] == null) {
163:                            if (nonNullArgs == args)
164:                                nonNullArgs = (Object[]) args.clone();
165:                            nonNullArgs[i] = "null";
166:                        }
167:                    }
168:
169:                    iString = MessageFormat.format(value, nonNullArgs);
170:                } catch (IllegalArgumentException iae) {
171:                    StringBuffer buf = new StringBuffer();
172:                    buf.append(value);
173:                    for (int i = 0; i < args.length; i++) {
174:                        buf.append(" arg[" + i + "]=" + args[i]);
175:                    }
176:                    iString = buf.toString();
177:                }
178:                return iString;
179:            }
180:
181:            /**
182:             * Get a string from the underlying resource bundle and format it
183:             * with the given object argument. This argument can of course be
184:             * a String object.
185:             *
186:             * @param key
187:             * @param arg
188:             */
189:
190:            public String getString(String key, Object arg) {
191:                Object[] args = new Object[] { arg };
192:                return getString(key, args);
193:            }
194:
195:            /**
196:             * Get a string from the underlying resource bundle and format it
197:             * with the given object arguments. These arguments can of course
198:             * be String objects.
199:             *
200:             * @param key
201:             * @param arg1
202:             * @param arg2
203:             */
204:
205:            public String getString(String key, Object arg1, Object arg2) {
206:                Object[] args = new Object[] { arg1, arg2 };
207:                return getString(key, args);
208:            }
209:
210:            /**
211:             * Get a string from the underlying resource bundle and format it
212:             * with the given object arguments. These arguments can of course
213:             * be String objects.
214:             *
215:             * @param key
216:             * @param arg1
217:             * @param arg2
218:             * @param arg3
219:             */
220:
221:            public String getString(String key, Object arg1, Object arg2,
222:                    Object arg3) {
223:                Object[] args = new Object[] { arg1, arg2, arg3 };
224:                return getString(key, args);
225:            }
226:
227:            /**
228:             * Get a string from the underlying resource bundle and format it
229:             * with the given object arguments. These arguments can of course
230:             * be String objects.
231:             *
232:             * @param key
233:             * @param arg1
234:             * @param arg2
235:             * @param arg3
236:             * @param arg4
237:             */
238:
239:            public String getString(String key, Object arg1, Object arg2,
240:                    Object arg3, Object arg4) {
241:                Object[] args = new Object[] { arg1, arg2, arg3, arg4 };
242:                return getString(key, args);
243:            }
244:
245:            // --------------------------------------------------------------
246:            // STATIC SUPPORT METHODS
247:            // --------------------------------------------------------------
248:
249:            private static Hashtable managers = new Hashtable();
250:
251:            /**
252:             * Get the StringManager for a particular package. If a manager for
253:             * a package already exists, it will be reused, else a new
254:             * StringManager will be created and returned.
255:             *
256:             * @param packageName
257:             */
258:
259:            public synchronized static StringManager getManager(
260:                    String packageName) {
261:                StringManager mgr = (StringManager) managers.get(packageName);
262:                if (mgr == null) {
263:                    mgr = new StringManager(packageName);
264:                    managers.put(packageName, mgr);
265:                }
266:                return mgr;
267:            }
268:        }
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