    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    }