Source Code Cross Referenced for Messages.java in  » Apache-Harmony-Java-SE » org-package » org » apache » harmony » misc » internal » nls » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Apache Harmony Java SE » org package » org.apache.harmony.misc.internal.nls 
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:
018:        /*
019:         * THE FILE HAS BEEN AUTOGENERATED BY MSGTOOL TOOL.
020:         * All changes made to this file manually will be overwritten 
021:         * if this tool runs again. Better make changes in the template file.
022:         */
023:
024:        package org.apache.harmony.misc.internal.nls;
025:
026:        import java.security.AccessController;
027:        import java.security.PrivilegedAction;
028:        import java.util.Locale;
029:        import java.util.MissingResourceException;
030:        import java.util.ResourceBundle;
031:
032:        import org.apache.harmony.kernel.vm.VM;
033:
034:        /**
035:         * This class retrieves strings from a resource bundle and returns them,
036:         * formatting them with MessageFormat when required.
037:         * <p>
038:         * It is used by the system classes to provide national language support, by
039:         * looking up messages in the <code>
040:         *    org.apache.harmony.misc.internal.nls.messages
041:         * </code>
042:         * resource bundle. Note that if this file is not available, or an invalid key
043:         * is looked up, or resource bundle support is not available, the key itself
044:         * will be returned as the associated message. This means that the <em>KEY</em>
045:         * should a reasonable human-readable (English) string.
046:         * 
047:         */
048:        public class Messages {
049:
050:            // ResourceBundle holding the system messages.
051:            static private ResourceBundle bundle = null;
052:
053:            /**
054:             * Retrieves a message which has no arguments.
055:             * 
056:             * @param msg
057:             *            String the key to look up.
058:             * @return String the message for that key in the system message bundle.
059:             */
060:            static public String getString(String msg) {
061:                if (bundle == null)
062:                    return msg;
063:                try {
064:                    return bundle.getString(msg);
065:                } catch (MissingResourceException e) {
066:                    return "Missing message: " + msg; //$NON-NLS-1$
067:                }
068:            }
069:
070:            /**
071:             * Retrieves a message which takes 1 argument.
072:             * 
073:             * @param msg
074:             *            String the key to look up.
075:             * @param arg
076:             *            Object the object to insert in the formatted output.
077:             * @return String the message for that key in the system message bundle.
078:             */
079:            static public String getString(String msg, Object arg) {
080:                return getString(msg, new Object[] { arg });
081:            }
082:
083:            /**
084:             * Retrieves a message which takes 1 integer argument.
085:             * 
086:             * @param msg
087:             *            String the key to look up.
088:             * @param arg
089:             *            int the integer to insert in the formatted output.
090:             * @return String the message for that key in the system message bundle.
091:             */
092:            static public String getString(String msg, int arg) {
093:                return getString(msg, new Object[] { Integer.toString(arg) });
094:            }
095:
096:            /**
097:             * Retrieves a message which takes 1 character argument.
098:             * 
099:             * @param msg
100:             *            String the key to look up.
101:             * @param arg
102:             *            char the character to insert in the formatted output.
103:             * @return String the message for that key in the system message bundle.
104:             */
105:            static public String getString(String msg, char arg) {
106:                return getString(msg, new Object[] { String.valueOf(arg) });
107:            }
108:
109:            /**
110:             * Retrieves a message which takes 2 arguments.
111:             * 
112:             * @param msg
113:             *            String the key to look up.
114:             * @param arg1
115:             *            Object an object to insert in the formatted output.
116:             * @param arg2
117:             *            Object another object to insert in the formatted output.
118:             * @return String the message for that key in the system message bundle.
119:             */
120:            static public String getString(String msg, Object arg1, Object arg2) {
121:                return getString(msg, new Object[] { arg1, arg2 });
122:            }
123:
124:            /**
125:             * Retrieves a message which takes several arguments.
126:             * 
127:             * @param msg
128:             *            String the key to look up.
129:             * @param args
130:             *            Object[] the objects to insert in the formatted output.
131:             * @return String the message for that key in the system message bundle.
132:             */
133:            static public String getString(String msg, Object[] args) {
134:                String format = msg;
135:
136:                if (bundle != null) {
137:                    try {
138:                        format = bundle.getString(msg);
139:                    } catch (MissingResourceException e) {
140:                    }
141:                }
142:
143:                return format(format, args);
144:            }
145:
146:            /**
147:             * Generates a formatted text string given a source string containing
148:             * "argument markers" of the form "{argNum}" where each argNum must be in
149:             * the range 0..9. The result is generated by inserting the toString of each
150:             * argument into the position indicated in the string.
151:             * <p>
152:             * To insert the "{" character into the output, use a single backslash
153:             * character to escape it (i.e. "\{"). The "}" character does not need to be
154:             * escaped.
155:             * 
156:             * @param format
157:             *            String the format to use when printing.
158:             * @param args
159:             *            Object[] the arguments to use.
160:             * @return String the formatted message.
161:             */
162:            public static String format(String format, Object[] args) {
163:                StringBuilder answer = new StringBuilder(format.length()
164:                        + (args.length * 20));
165:                String[] argStrings = new String[args.length];
166:                for (int i = 0; i < args.length; ++i) {
167:                    if (args[i] == null)
168:                        argStrings[i] = "<null>"; //$NON-NLS-1$
169:                    else
170:                        argStrings[i] = args[i].toString();
171:                }
172:                int lastI = 0;
173:                for (int i = format.indexOf('{', 0); i >= 0; i = format
174:                        .indexOf('{', lastI)) {
175:                    if (i != 0 && format.charAt(i - 1) == '\\') {
176:                        // It's escaped, just print and loop.
177:                        if (i != 1)
178:                            answer.append(format.substring(lastI, i - 1));
179:                        answer.append('{');
180:                        lastI = i + 1;
181:                    } else {
182:                        // It's a format character.
183:                        if (i > format.length() - 3) {
184:                            // Bad format, just print and loop.
185:                            answer.append(format.substring(lastI, format
186:                                    .length()));
187:                            lastI = format.length();
188:                        } else {
189:                            int argnum = (byte) Character.digit(format
190:                                    .charAt(i + 1), 10);
191:                            if (argnum < 0 || format.charAt(i + 2) != '}') {
192:                                // Bad format, just print and loop.
193:                                answer.append(format.substring(lastI, i + 1));
194:                                lastI = i + 1;
195:                            } else {
196:                                // Got a good one!
197:                                answer.append(format.substring(lastI, i));
198:                                if (argnum >= argStrings.length)
199:                                    answer.append("<missing argument>"); //$NON-NLS-1$
200:                                else
201:                                    answer.append(argStrings[argnum]);
202:                                lastI = i + 3;
203:                            }
204:                        }
205:                    }
206:                }
207:                if (lastI < format.length())
208:                    answer.append(format.substring(lastI, format.length()));
209:                return answer.toString();
210:            }
211:
212:            /**
213:             * Changes the locale of the messages.
214:             * 
215:             * @param locale
216:             *            Locale the locale to change to.
217:             */
218:            static public ResourceBundle setLocale(final Locale locale,
219:                    final String resource) {
220:                try {
221:                    final ClassLoader loader = VM.bootCallerClassLoader();
222:                    return (ResourceBundle) AccessController
223:                            .doPrivileged(new PrivilegedAction<Object>() {
224:                                public Object run() {
225:                                    return ResourceBundle
226:                                            .getBundle(
227:                                                    resource,
228:                                                    locale,
229:                                                    loader != null ? loader
230:                                                            : ClassLoader
231:                                                                    .getSystemClassLoader());
232:                                }
233:                            });
234:                } catch (MissingResourceException e) {
235:                }
236:                return null;
237:            }
238:
239:            static {
240:                // Attempt to load the messages.
241:                try {
242:                    bundle = setLocale(Locale.getDefault(),
243:                            "org.apache.harmony.misc.internal.nls.messages"); //$NON-NLS-1$
244:                } catch (Throwable e) {
245:                    e.printStackTrace();
246:                }
247:            }
248:        }
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