001    // Copyright 2006, 2007 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.ioc.internal.util.CollectionFactory;
018    import org.apache.tapestry5.services.AliasContribution;
019    import org.apache.tapestry5.services.AliasManager;
020    import org.slf4j.Logger;
021    
022    import java.util.Collection;
023    import java.util.Map;
024    
025    public class AliasManagerImpl implements AliasManager
026    {
027        private final Logger logger;
028    
029        private final Collection<AliasContribution> contributions;
030    
031        public AliasManagerImpl(Logger logger, Collection<AliasContribution> contributions)
032        {
033            this.logger = logger;
034            this.contributions = contributions;
035        }
036    
037        public Map<Class, Object> getAliasesForMode(String mode)
038        {
039            Map<Class, Object> general = buildMapForMode("");
040            Map<Class, Object> specific = buildMapForMode(mode);
041    
042            // Anything in specific overrides anything in general
043    
044            general.putAll(specific);
045    
046            return general;
047        }
048    
049        private Map<Class, Object> buildMapForMode(String mode)
050        {
051            Map<Class, Object> result = CollectionFactory.newMap();
052    
053            for (AliasContribution ic : contributions)
054            {
055                if (!ic.getMode().equalsIgnoreCase(mode)) continue;
056    
057                Class contributionType = ic.getContributionType();
058    
059                Object existing = result.get(contributionType);
060    
061                if (existing != null)
062                {
063                    logger.error(ServicesMessages.duplicateContribution(
064                            ic.getObject(),
065                            contributionType,
066                            existing));
067                    continue;
068                }
069    
070                result.put(contributionType, ic.getObject());
071            }
072    
073            return result;
074        }
075    
076    }