    001    // Copyright 2006, 2007, 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 org.apache.tapestry5.ComponentResources;
    018    import org.apache.tapestry5.internal.transform.ReadOnlyComponentFieldConduit;
    019    import org.apache.tapestry5.ioc.Messages;
    020    import org.apache.tapestry5.ioc.ObjectLocator;
    021    import org.apache.tapestry5.ioc.internal.util.CollectionFactory;
    022    import org.apache.tapestry5.model.MutableComponentModel;
    023    import org.apache.tapestry5.plastic.ComputedValue;
    024    import org.apache.tapestry5.plastic.InstanceContext;
    025    import org.apache.tapestry5.plastic.PlasticField;
    026    import org.apache.tapestry5.services.pageload.ComponentResourceSelector;
    027    import org.apache.tapestry5.services.transform.InjectionProvider2;
    028    import org.slf4j.Logger;
    029
    030    import java.util.Locale;
    031    import java.util.Map;
    032
    033    /**
    034     * Allows for a number of anonymous injections based on the type of field that is to be injected.
    035     */
    036    public class CommonResourcesInjectionProvider implements InjectionProvider2
    037    {
    038        abstract static class ResourceProvider<T> implements ComputedValue<T>
    039        {
    040            public T get(InstanceContext context)
    041            {
    042                ComponentResources resources = context.get(ComponentResources.class);
    043
    044                return get(resources);
    045            }
    046
    047            abstract T get(ComponentResources resources);
    048        }
    049
    050        private static ResourceProvider<ComponentResourceSelector> selectorProvider = new ResourceProvider<ComponentResourceSelector>()
    051        {
    052            public ComponentResourceSelector get(ComponentResources resources)
    053            {
    054                return resources.getResourceSelector();
    055            }
    056        };
    057
    058        private static ResourceProvider<Messages> messagesProvider = new ResourceProvider<Messages>()
    059        {
    060
    061            public Messages get(ComponentResources resources)
    062            {
    063                return resources.getMessages();
    064            }
    065        };
    066
    067        private static ResourceProvider<Locale> localeProvider = new ResourceProvider<Locale>()
    068        {
    069
    070            public Locale get(ComponentResources resources)
    071            {
    072                return resources.getLocale();
    073            }
    074        };
    075
    076        private static ResourceProvider<Logger> loggerProvider = new ResourceProvider<Logger>()
    077        {
    078
    079            public Logger get(ComponentResources resources)
    080            {
    081                return resources.getLogger();
    082            }
    083        };
    084
    085
    086        private static ResourceProvider<ComponentResources> resourcesProvider = new ResourceProvider<ComponentResources>()
    087        {
    088            public ComponentResources get(ComponentResources resources)
    089            {
    090                return resources;
    091            }
    092        };
    093
    094        private static final Map<String, ResourceProvider> configuration = CollectionFactory.newMap();
    095
    096        {
    097            add(ComponentResources.class, resourcesProvider);
    098            add(ComponentResourceSelector.class, selectorProvider);
    099            add(Messages.class, messagesProvider);
    100            add(Locale.class, localeProvider);
    101            add(Logger.class, loggerProvider);
    102        }
    103
    104        private static void add(Class type, ResourceProvider provider)
    105        {
    106            configuration.put(type.getName(), provider);
    107        }
    108
    109        public boolean provideInjection(PlasticField field, ObjectLocator locator, MutableComponentModel componentModel)
    110        {
    111            final ResourceProvider provider = configuration.get(field.getTypeName());
    112
    113            if (provider == null)
    114            {
    115                return false;
    116            }
    117
    118            field.injectComputed(provider);
    119
    120            return true;
    121        }
    122    }