    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
    015package org.apache.tapestry5.internal.services;
    016
    017import org.apache.tapestry5.commons.util.CollectionFactory;
    018import org.apache.tapestry5.services.PersistentFieldBundle;
    019import org.apache.tapestry5.services.PersistentFieldChange;
    020
    021import java.util.Collection;
    022import java.util.Map;
    023
    024public 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}