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
015package org.apache.tapestry5.internal.services;
016
017import java.util.Collections;
018import java.util.List;
019import java.util.Map;
020
021import org.apache.tapestry5.Translator;
022import org.apache.tapestry5.ioc.internal.util.CollectionFactory;
023import org.apache.tapestry5.ioc.util.AvailableValues;
024import org.apache.tapestry5.ioc.util.StrategyRegistry;
025import org.apache.tapestry5.ioc.util.UnknownValueException;
026import org.apache.tapestry5.services.InvalidationListener;
027import org.apache.tapestry5.services.TranslatorSource;
028
029@SuppressWarnings("unchecked")
030public 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}