// Copyright 2006, 2007 The Apache Software Foundation

 //

 // Licensed under the Apache License, Version 2.0 (the "License");

 // you may not use this file except in compliance with the License.

 // You may obtain a copy of the License at

 //

 //     http://www.apache.org/licenses/LICENSE-2.0

 //

 // Unless required by applicable law or agreed to in writing, software

 // distributed under the License is distributed on an "AS IS" BASIS,

 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 // See the License for the specific language governing permissions and

 // limitations under the License.

 package org.apache.tapestry5.internal.services;

 import org.apache.tapestry5.ioc.internal.util.CollectionFactory;

 import org.apache.tapestry5.services.AliasContribution;

 import org.apache.tapestry5.services.AliasManager;

 import org.slf4j.Logger;

 import java.util.Collection;

 import java.util.Map;

 public class AliasManagerImpl implements AliasManager

 {

     private final Logger logger;

     private final Collection<AliasContribution> contributions;

     public AliasManagerImpl(Logger logger, Collection<AliasContribution> contributions)

     {

         this.logger = logger;

         this.contributions = contributions;

     }

     public Map<Class, Object> getAliasesForMode(String mode)

     {

         Map<Class, Object> general = buildMapForMode("");

         Map<Class, Object> specific = buildMapForMode(mode);

         // Anything in specific overrides anything in general

         general.putAll(specific);

         return general;

     }

     private Map<Class, Object> buildMapForMode(String mode)

     {

         Map<Class, Object> result = CollectionFactory.newMap();

         for (AliasContribution ic : contributions)

         {

             if (!ic.getMode().equalsIgnoreCase(mode)) continue;

             Class contributionType = ic.getContributionType();

             Object existing = result.get(contributionType);

             if (existing != null)

             {

                 logger.error(ServicesMessages.duplicateContribution(

                         ic.getObject(),

                         contributionType,

                         existing));

                 continue;

             }

             result.put(contributionType, ic.getObject());

         }

         return result;

     }

 }