base/runtime/org.argeo.eclipse.ui.rcp/src/main/java/org/argeo/eclipse/ui/specific/ThreadNLS.java

   1 /*
   2  * Copyright (C) 2007-2012 Argeo GmbH
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *         http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 package org.argeo.eclipse.ui.specific;
  17
  18 import java.lang.reflect.Constructor;
  19 import java.lang.reflect.Field;
  20 import java.lang.reflect.Modifier;
  21 import java.util.MissingResourceException;
  22 import java.util.ResourceBundle;
  23
  24 import org.argeo.util.LocaleUtils;
  25 import org.eclipse.osgi.util.NLS;
  26
  27 /** NLS attached to a given thread */
  28 public class ThreadNLS<T extends NLS> extends InheritableThreadLocal<T> {
  29         public final static String DEFAULT_BUNDLE_LOCATION = "/properties/plugin";
  30
  31         private final String bundleLocation;
  32
  33         private Class<T> type;
  34         private Boolean utf8 = false;
  35
  36         public ThreadNLS(String bundleLocation, Class<T> type, Boolean utf8) {
  37                 this.bundleLocation = bundleLocation;
  38                 this.type = type;
  39                 this.utf8 = utf8;
  40         }
  41
  42         public ThreadNLS(Class<T> type) {
  43                 this(DEFAULT_BUNDLE_LOCATION, type, false);
  44         }
  45
  46         @Override
  47         protected T initialValue() {
  48                 ResourceBundle bundle = ResourceBundle.getBundle(bundleLocation,
  49                                 LocaleUtils.threadLocale.get(), type.getClassLoader());
  50                 T result;
  51                 try {
  52                         NLS.initializeMessages(bundleLocation, type);
  53                         Constructor<T> constructor = type.getConstructor();
  54                         constructor.setAccessible(true);
  55                         result = constructor.newInstance();
  56                         final Field[] fieldArray = type.getDeclaredFields();
  57                         for (int i = 0; i < fieldArray.length; i++) {
  58                                 int modifiers = fieldArray[i].getModifiers();
  59                                 if (String.class.isAssignableFrom(fieldArray[i].getType())
  60                                                 && Modifier.isPublic(modifiers)
  61                                                 && !Modifier.isStatic(modifiers)) {
  62                                         try {
  63                                                 String value = bundle
  64                                                                 .getString(fieldArray[i].getName());
  65                                                 byte[] bytes = value.getBytes();
  66
  67                                                 String forcedValue;
  68                                                 if (utf8)
  69                                                         forcedValue = new String(bytes, "UTF8");
  70                                                 else
  71                                                         forcedValue = value;
  72                                                 if (value != null) {
  73                                                         fieldArray[i].setAccessible(true);
  74                                                         fieldArray[i].set(result, forcedValue);
  75                                                 }
  76                                         } catch (final MissingResourceException mre) {
  77                                                 fieldArray[i].setAccessible(true);
  78                                                 fieldArray[i].set(result, "");
  79                                                 mre.printStackTrace();
  80                                         }
  81                                 }
  82                         }
  83                         return result;
  84                 } catch (final Exception ex) {
  85                         throw new IllegalStateException(ex.getMessage());
  86                 }
  87         }
  88
  89 }