Source Code Cross Referenced for StringManager.java in  » Portal » Pluto » org » apache » pluto » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Portal » Pluto » org.apache.pluto.util 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Licensed to the Apache Software Foundation (ASF) under one or more
003:         * contributor license agreements.  See the NOTICE file distributed with
004:         * this work for additional information regarding copyright ownership.
005:         * The ASF licenses this file to You under the Apache License, Version 2.0
006:         * (the "License"); you may not use this file except in compliance with
007:         * the License.  You may obtain a copy of the License at
008:         *
009:         *      http://www.apache.org/licenses/LICENSE-2.0
010:         *
011:         * Unless required by applicable law or agreed to in writing, software
012:         * distributed under the License is distributed on an "AS IS" BASIS,
013:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014:         * See the License for the specific language governing permissions and
015:         * limitations under the License.
016:         */
017:        package org.apache.pluto.util;
018:
019:        import org.apache.commons.logging.LogFactory;
020:        import org.apache.commons.logging.Log;
021:
022:        import java.net.URLClassLoader;
023:        import java.text.MessageFormat;
024:        import java.util.Hashtable;
025:        import java.util.Locale;
026:        import java.util.MissingResourceException;
027:        import java.util.ResourceBundle;
028:
029:        /**
030:         * An internationalization / localization helper class which reduces the bother
031:         * of handling ResourceBundles and takes care of the common cases of message
032:         * formating which otherwise require the creation of Object arrays and such.
033:         * <p/>
034:         * <p>The StringManager operates on a package basis. One StringManager per
035:         * package can be created and accessed via the getManager method call.
036:         * <p/>
037:         * <p>The StringManager will look for a ResourceBundle named by the package name
038:         * given plus the suffix of "LocalStrings". In practice, this means that the
039:         * localized information will be contained in a LocalStrings.properties file
040:         * located in the package directory of the classpath.
041:         * <p/>
042:         * <p>Please see the documentation for java.util.ResourceBundle for more
043:         * information.
044:         */
045:        public class StringManager {
046:            private static final Log LOG = LogFactory
047:                    .getLog(StringManager.class);
048:
049:            /**
050:             * The ResourceBundle for this StringManager.
051:             */
052:
053:            private ResourceBundle bundle;
054:
055:            /**
056:             * The package this StringManager belongs to.
057:             */
058:            private final String packageName;
059:
060:            /**
061:             * Creates a new StringManager for a given package. This is a private method
062:             * and all access to it is arbitrated by the static getManager method call
063:             * so that only one StringManager per package will be created.
064:             * @param packageName Name of package to create StringManager for.
065:             */
066:
067:            private StringManager(String packageName) {
068:                if (LOG.isDebugEnabled()) {
069:                    LOG.debug("String Manager Created for package: "
070:                            + packageName);
071:                }
072:                this .packageName = packageName;
073:                String bundleName = packageName + ".LocalStrings";
074:                try {
075:                    bundle = ResourceBundle.getBundle(bundleName);
076:                    return;
077:                } catch (MissingResourceException ex) {
078:                    // Try from the current loader ( that's the case for trusted apps )
079:                    ClassLoader cl = Thread.currentThread()
080:                            .getContextClassLoader();
081:                    if (cl != null) {
082:                        try {
083:                            bundle = ResourceBundle.getBundle(bundleName,
084:                                    Locale.getDefault(), cl);
085:                            return;
086:                        } catch (MissingResourceException ex2) {
087:                        }
088:                    }
089:                    if (cl == null) {
090:                        cl = this .getClass().getClassLoader();
091:                    }
092:
093:                    System.out.println("Can't find resource " + bundleName
094:                            + " " + cl);
095:                    if (cl instanceof  URLClassLoader) {
096:                        System.out.println(((URLClassLoader) cl).getURLs());
097:                    }
098:                }
099:            }
100:
101:            /**
102:             * Get a string from the underlying resource bundle.
103:             * @param key The resource name
104:             */
105:            public String getString(String key) {
106:                return MessageFormat.format(getStringInternal(key), null);
107:            }
108:
109:            protected String getStringInternal(String key) {
110:                if (key == null) {
111:                    String msg = "key is null";
112:
113:                    throw new NullPointerException(msg);
114:                }
115:
116:                String str = null;
117:
118:                if (bundle == null) {
119:                    return key;
120:                }
121:                try {
122:                    str = bundle.getString(key);
123:                } catch (MissingResourceException mre) {
124:                    String name = null;
125:                    if (packageName == null) {
126:                        name = "unknown";
127:                    } else {
128:                        name = packageName;
129:                    }
130:                    str = "Cannot find message in the ResourceBundle associated with key '"
131:                            + key + "' " + "(package " + name + ")";
132:                    LOG.warn(str, mre);
133:                }
134:
135:                return str;
136:            }
137:
138:            /**
139:             * Get a string from the underlying resource bundle and format it with the
140:             * given set of arguments.
141:             * @param key  The resource name
142:             * @param args Formatting directives
143:             */
144:
145:            public String getString(String key, Object[] args) {
146:                String iString = null;
147:                String value = getStringInternal(key);
148:
149:                // this check for the runtime exception is some pre 1.1.6
150:                // VM's don't do an automatic toString() on the passed in
151:                // objects and barf out
152:
153:                try {
154:                    // ensure the arguments are not null so pre 1.2 VM's don't barf
155:                    Object nonNullArgs[] = args;
156:                    for (int i = 0; i < args.length; i++) {
157:                        if (args[i] == null) {
158:                            if (nonNullArgs == args) {
159:                                nonNullArgs = (Object[]) args.clone();
160:                            }
161:                            nonNullArgs[i] = "null";
162:                        }
163:                    }
164:
165:                    iString = MessageFormat.format(value, nonNullArgs);
166:                } catch (IllegalArgumentException iae) {
167:                    StringBuffer buf = new StringBuffer();
168:                    buf.append(value);
169:                    for (int i = 0; i < args.length; i++) {
170:                        buf.append(" arg[").append(i).append("]=").append(
171:                                args[i]);
172:                    }
173:                    iString = buf.toString();
174:                }
175:                return iString;
176:            }
177:
178:            /**
179:             * Get a string from the underlying resource bundle and format it with the
180:             * given object argument. This argument can of course be a String object.
181:             * @param key The resource name
182:             * @param arg Formatting directive
183:             */
184:
185:            public String getString(String key, Object arg) {
186:                Object[] args = new Object[] { arg };
187:                return getString(key, args);
188:            }
189:
190:            /**
191:             * Get a string from the underlying resource bundle and format it with the
192:             * given object arguments. These arguments can of course be String objects.
193:             * @param key  The resource name
194:             * @param arg1 Formatting directive
195:             * @param arg2 Formatting directive
196:             */
197:
198:            public String getString(String key, Object arg1, Object arg2) {
199:                Object[] args = new Object[] { arg1, arg2 };
200:                return getString(key, args);
201:            }
202:
203:            /**
204:             * Get a string from the underlying resource bundle and format it with the
205:             * given object arguments. These arguments can of course be String objects.
206:             * @param key  The resource name
207:             * @param arg1 Formatting directive
208:             * @param arg2 Formatting directive
209:             * @param arg3 Formatting directive
210:             */
211:
212:            public String getString(String key, Object arg1, Object arg2,
213:                    Object arg3) {
214:                Object[] args = new Object[] { arg1, arg2, arg3 };
215:                return getString(key, args);
216:            }
217:
218:            /**
219:             * Get a string from the underlying resource bundle and format it with the
220:             * given object arguments. These arguments can of course be String objects.
221:             * @param key  The resource name
222:             * @param arg1 Formatting directive
223:             * @param arg2 Formatting directive
224:             * @param arg3 Formatting directive
225:             * @param arg4 Formatting directive
226:             */
227:
228:            public String getString(String key, Object arg1, Object arg2,
229:                    Object arg3, Object arg4) {
230:                Object[] args = new Object[] { arg1, arg2, arg3, arg4 };
231:                return getString(key, args);
232:            }
233:
234:            // --------------------------------------------------------------
235:            // STATIC SUPPORT METHODS
236:            // --------------------------------------------------------------
237:
238:            private static Hashtable managers = new Hashtable();
239:
240:            /**
241:             * Get the StringManager for a particular package. If a manager for a
242:             * package already exists, it will be reused, else a new StringManager will
243:             * be created and returned.
244:             * @param packageName The package name
245:             */
246:
247:            public synchronized static StringManager getManager(
248:                    String packageName) {
249:                StringManager mgr = (StringManager) managers.get(packageName);
250:
251:                if (mgr == null) {
252:                    mgr = new StringManager(packageName);
253:                    managers.put(packageName, mgr);
254:                }
255:                return mgr;
256:            }
257:        }
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