001 // Copyright 2007, 2008, 2010 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.tapestry5.internal.services;
016
017 import java.util.Collections;
018 import java.util.List;
019 import java.util.Map;
020
021 import org.apache.tapestry5.Translator;
022 import org.apache.tapestry5.ioc.internal.util.CollectionFactory;
023 import org.apache.tapestry5.ioc.util.AvailableValues;
024 import org.apache.tapestry5.ioc.util.StrategyRegistry;
025 import org.apache.tapestry5.ioc.util.UnknownValueException;
026 import org.apache.tapestry5.services.InvalidationListener;
027 import org.apache.tapestry5.services.TranslatorSource;
028
029 @SuppressWarnings("unchecked")
030 public class TranslatorSourceImpl implements TranslatorSource, InvalidationListener
031 {
032 private final Map<String, Translator> nameToTranslator = CollectionFactory.newCaseInsensitiveMap();
033
034 private final StrategyRegistry<Translator> registry;
035
036 private static final Map<String, Translator> EMPTY = Collections.emptyMap();
037
038 public TranslatorSourceImpl(Map<Class, Translator> configuration)
039 {
040 this(configuration, EMPTY);
041 }
042
043 public TranslatorSourceImpl(Map<Class, Translator> configuration, Map<String, Translator> alternates)
044 {
045 for (Map.Entry<Class, Translator> me : configuration.entrySet())
046 {
047 Class type = me.getKey();
048 Translator translator = me.getValue();
049
050 if (!type.equals(translator.getType()))
051 throw new RuntimeException(
052 String
053 .format(
054 "Contributed translator for type %s reports its type as %s. Please change the contribution so that the key matches that translator type.",
055 type.getName(), translator.getType().getName()));
056
057 String name = translator.getName();
058
059 if (nameToTranslator.containsKey(name))
060 throw new RuntimeException(
061 String
062 .format(
063 "Two different Translators contributed to the TranslatorSource service use the same translator name: '%s'. Translator names must be unique.",
064 name));
065
066 nameToTranslator.put(name, translator);
067 }
068
069 for (String name : alternates.keySet())
070 {
071 if (nameToTranslator.containsKey(name))
072 throw new RuntimeException(
073 String
074 .format(
075 "Translator '%s' contributed to the TranslatorAlternatesSource service has the same name as a standard Translator contributed to the TranslatorSource service.",
076 name));
077
078 nameToTranslator.put(name, alternates.get(name));
079 }
080
081 registry = StrategyRegistry.newInstance(Translator.class, configuration, true);
082 }
083
084 public Translator get(String name)
085 {
086 Translator result = nameToTranslator.get(name);
087
088 if (result == null)
089 throw new UnknownValueException(String.format("Unknown translator type '%s'.", name), new AvailableValues(
090 "Configured translators", nameToTranslator));
091
092 return result;
093 }
094
095 public Translator getByType(Class valueType)
096 {
097 Translator result = registry.get(valueType);
098
099 if (result == null)
100 {
101 List<String> names = CollectionFactory.newList();
102
103 for (Class type : registry.getTypes())
104 {
105 names.add(type.getName());
106 }
107
108 throw new IllegalArgumentException(ServicesMessages.noTranslatorForType(valueType, names));
109 }
110
111 return result;
112 }
113
114 public Translator findByType(Class valueType)
115 {
116 return registry.get(valueType);
117 }
118
119 public void objectWasInvalidated()
120 {
121 registry.clearCache();
122 }
123 }