001 // Copyright 2004, 2005 The Apache Software Foundation 002 // 003 // Licensed under the Apache License, Version 2.0 (the "License"); 004 // you may not use this file except in compliance with the License. 005 // You may obtain a copy of the License at 006 // 007 // http://www.apache.org/licenses/LICENSE-2.0 008 // 009 // Unless required by applicable law or agreed to in writing, software 010 // distributed under the License is distributed on an "AS IS" BASIS, 011 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 012 // See the License for the specific language governing permissions and 013 // limitations under the License. 014 015 package org.apache.hivemind.impl; 016 017 import java.util.Locale; 018 import java.util.MissingResourceException; 019 import java.util.ResourceBundle; 020 021 import org.apache.commons.logging.Log; 022 import org.apache.commons.logging.LogFactory; 023 024 /** 025 * A wrapper around {@link java.util.ResourceBundle} that makes it easier to access and format 026 * messages. 027 * 028 * @author Howard Lewis Ship 029 */ 030 public class MessageFormatter extends AbstractMessages 031 { 032 private Log _log; 033 034 private ResourceBundle _bundle; 035 036 public MessageFormatter(Log log, ResourceBundle bundle) 037 { 038 _log = log; 039 _bundle = bundle; 040 } 041 042 /** 043 * Assumes that the bundle name is the same as the reference class, with "Messages" stripped 044 * off, and "Strings" appended. 045 * 046 * @since 1.1 047 */ 048 public MessageFormatter(Class referenceClass) 049 { 050 this(referenceClass, getStringsName(referenceClass)); 051 } 052 053 public MessageFormatter(Class referenceClass, String name) 054 { 055 this(LogFactory.getLog(referenceClass), referenceClass, name); 056 } 057 058 public MessageFormatter(Log log, Class referenceClass, String name) 059 { 060 this(log, getResourceBundleName(referenceClass, name)); 061 } 062 063 public MessageFormatter(Log log, String bundleName) 064 { 065 this(log, ResourceBundle.getBundle(bundleName)); 066 } 067 068 protected String findMessage(String key) 069 { 070 try 071 { 072 return _bundle.getString(key); 073 } 074 catch (MissingResourceException ex) 075 { 076 _log.error("Missing resource key: " + key + "."); 077 return null; 078 } 079 } 080 081 protected Locale getLocale() 082 { 083 return Locale.getDefault(); 084 } 085 086 private static String getStringsName(Class referenceClass) 087 { 088 String className = referenceClass.getName(); 089 090 int lastDotIndex = className.lastIndexOf('.'); 091 092 String justClass = className.substring(lastDotIndex + 1); 093 094 int mpos = justClass.indexOf("Messages"); 095 096 return justClass.substring(0, mpos) + "Strings"; 097 } 098 099 private static String getResourceBundleName(Class referenceClass, String name) 100 { 101 String packageName = null; 102 if (referenceClass.getPackage() != null) 103 { 104 packageName = referenceClass.getPackage().getName(); 105 } 106 else 107 { 108 final int lastDotIndex = referenceClass.getName().lastIndexOf('.'); 109 packageName = (lastDotIndex == -1 ? "" : referenceClass.getName().substring( 110 0, 111 lastDotIndex)); 112 113 } 114 return packageName.equals("") ? name : packageName + "." + name; 115 } 116 }