001    // Copyright 2006 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.PersistentFieldBundle;
019    import org.apache.tapestry5.services.PersistentFieldChange;
020    
021    import java.util.Collection;
022    import java.util.Map;
023    
024    public class PersistentFieldBundleImpl implements PersistentFieldBundle
025    {
026        /**
027         * Keyed on componentId + fieldName.
028         */
029        private final Map<String, Object> values = CollectionFactory.newMap();
030    
031        public PersistentFieldBundleImpl(Collection<PersistentFieldChange> changes)
032        {
033            for (PersistentFieldChange change : changes)
034            {
035                String key = buildKey(change.getComponentId(), change.getFieldName());
036    
037                values.put(key, change.getValue());
038            }
039        }
040    
041        private String buildKey(String componentId, String fieldName)
042        {
043            StringBuilder builder = new StringBuilder();
044            if (componentId != null) builder.append(componentId);
045            builder.append(':');
046            builder.append(fieldName);
047    
048            return builder.toString();
049        }
050    
051        public boolean containsValue(String componentId, String fieldName)
052        {
053            String key = buildKey(componentId, fieldName);
054    
055            return values.containsKey(key);
056        }
057    
058        public Object getValue(String componentId, String fieldName)
059        {
060            String key = buildKey(componentId, fieldName);
061    
062            return values.get(key);
063        }
064    
065    }