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    
015    package org.apache.tapestry5.internal.services;
016    
017    import java.util.Locale;
018    import java.util.Set;
019    
020    import org.apache.tapestry5.SymbolConstants;
021    import org.apache.tapestry5.internal.TapestryInternalUtils;
022    import org.apache.tapestry5.ioc.annotations.Symbol;
023    import org.apache.tapestry5.ioc.internal.util.CollectionFactory;
024    import org.apache.tapestry5.ioc.services.PerThreadValue;
025    import org.apache.tapestry5.ioc.services.PerthreadManager;
026    import org.apache.tapestry5.services.PersistentLocale;
027    
028    public 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    }