001// Copyright 2007, 2008, 2009, 2010, 2011 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.Locale;
018import java.util.Set;
019
020import org.apache.tapestry5.SymbolConstants;
021import org.apache.tapestry5.commons.util.CollectionFactory;
022import org.apache.tapestry5.internal.TapestryInternalUtils;
023import org.apache.tapestry5.ioc.annotations.Symbol;
024import org.apache.tapestry5.ioc.services.PerThreadValue;
025import org.apache.tapestry5.ioc.services.PerthreadManager;
026import org.apache.tapestry5.services.PersistentLocale;
027
028public class PersistentLocaleImpl implements PersistentLocale
029{
030    private final String supportedLocales;
031
032    private final PerThreadValue<Locale> localeValue;
033
034    private final Set<String> localeNames = CollectionFactory.newSet();
035
036    public PersistentLocaleImpl(PerthreadManager perThreadManager,
037
038    @Symbol(SymbolConstants.SUPPORTED_LOCALES)
039    String supportedLocales)
040    {
041        this.supportedLocales = supportedLocales;
042
043        localeValue = perThreadManager.createValue();
044
045        for (String name : TapestryInternalUtils.splitAtCommas(supportedLocales))
046        {
047            localeNames.add(name.toLowerCase());
048        }
049    }
050
051    public void set(Locale locale)
052    {
053        assert locale != null;
054        
055        if (!localeNames.contains(locale.toString().toLowerCase()))
056        {
057            String message = String
058                    .format("Locale '%s' is not supported by this application. Supported locales are '%s'; this is configured via the %s symbol.",
059                            locale, supportedLocales, SymbolConstants.SUPPORTED_LOCALES);
060
061            throw new IllegalArgumentException(message);
062        }
063
064        localeValue.set(locale);
065    }
066
067    public Locale get()
068    {
069        return localeValue.get();
070    }
071
072    public boolean isSet()
073    {
074        return localeValue.exists();
075    }
076}