    001// Copyright 2007, 2008, 2010, 2011, 2012 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 org.apache.tapestry5.Translator;
    018import org.apache.tapestry5.commons.services.InvalidationEventHub;
    019import org.apache.tapestry5.commons.util.AvailableValues;
    020import org.apache.tapestry5.commons.util.CollectionFactory;
    021import org.apache.tapestry5.commons.util.StrategyRegistry;
    022import org.apache.tapestry5.commons.util.UnknownValueException;
    023import org.apache.tapestry5.ioc.annotations.ComponentClasses;
    024import org.apache.tapestry5.ioc.annotations.PostInjection;
    025import org.apache.tapestry5.ioc.internal.util.InternalUtils;
    026import org.apache.tapestry5.plastic.PlasticUtils;
    027import org.apache.tapestry5.services.TranslatorSource;
    028
    029import java.util.Collections;
    030import java.util.List;
    031import java.util.Map;
    032
    033@SuppressWarnings("unchecked")
    034public class TranslatorSourceImpl implements TranslatorSource, Runnable
    035{
    036    private final Map<String, Translator> nameToTranslator = CollectionFactory.newCaseInsensitiveMap();
    037
    038    private final StrategyRegistry<Translator> registry;
    039
    040    private static final Map<String, Translator> EMPTY = Collections.emptyMap();
    041
    042    public TranslatorSourceImpl(Map<Class, Translator> configuration)
    043    {
    044        this(configuration, EMPTY);
    045    }
    046
    047    public TranslatorSourceImpl(Map<Class, Translator> configuration, Map<String, Translator> alternates)
    048    {
    049        for (Map.Entry<Class, Translator> me : configuration.entrySet())
    050        {
    051            Class type = me.getKey();
    052            Translator translator = me.getValue();
    053
    054            if (!type.equals(translator.getType()))
    055                throw new RuntimeException(
    056                        String
    057                                .format(
    058                                        "Contributed translator for type %s reports its type as %s. Please change the contribution so that the key matches that translator type.",
    059                                        type.getName(), translator.getType().getName()));
    060
    061            String name = translator.getName();
    062
    063            if (nameToTranslator.containsKey(name))
    064                throw new RuntimeException(
    065                        String
    066                                .format(
    067                                        "Two different Translators contributed to the TranslatorSource service use the same translator name: '%s'.  Translator names must be unique.",
    068                                        name));
    069
    070            nameToTranslator.put(name, translator);
    071        }
    072
    073        for (String name : alternates.keySet())
    074        {
    075            if (nameToTranslator.containsKey(name))
    076                throw new RuntimeException(
    077                        String
    078                                .format(
    079                                        "Translator '%s' contributed to the TranslatorAlternatesSource service has the same name as a standard Translator contributed to the TranslatorSource service.",
    080                                        name));
    081
    082            nameToTranslator.put(name, alternates.get(name));
    083        }
    084
    085        registry = StrategyRegistry.newInstance(Translator.class, configuration, true);
    086    }
    087
    088public Translator get(String name)
    089    {
    090        Translator result = nameToTranslator.get(name);
    091
    092        if (result == null)
    093            throw new UnknownValueException(String.format("Unknown translator type '%s'.", name), new AvailableValues(
    094                    "Configured translators", nameToTranslator));
    095
    096        return result;
    097    }
    098
    099    public Translator getByType(Class valueType)
    100    {
    101        Translator result = registry.get(valueType);
    102
    103        if (result == null)
    104        {
    105            List<String> names = CollectionFactory.newList();
    106
    107            for (Class type : registry.getTypes())
    108            {
    109                names.add(type.getName());
    110            }
    111
    112            throw new IllegalArgumentException(String.format("No translator is defined for type %s.  Registered types: %s.", PlasticUtils.toTypeName(valueType), InternalUtils
    113                    .joinSorted(names)));
    114        }
    115
    116        return result;
    117    }
    118
    119    public Translator findByType(Class valueType)
    120    {
    121        return registry.get(valueType);
    122    }
    123
    124    /**
    125     * Invoked by InvalidationEventHub
    126     */
    127    public void run()
    128    {
    129        registry.clearCache();
    130    }
    131}