001    // Copyright 2005 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.tapestry.services.impl;
016    
017    import org.apache.hivemind.Location;
018    import org.apache.hivemind.internal.Module;
019    import org.apache.hivemind.schema.Translator;
020    
021    /**
022     * Service <code>tapestry.DeferredObjectTranslator</code>, which is used to encapsulate the
023     * ObjectTranslator and return {@link org.apache.tapestry.services.impl.DeferredObjectImpl}instances.
024     * These allow the translator to <em>not be executed until (and unless)
025     * the value is needed</em>,
026     * with the added expense that you have to de-referrence the
027     * {@link org.apache.tapestry.services.impl.DeferredObjectImpl}.
028     * 
029     * @author Howard M. Lewis Ship
030     * @since 4.0
031     */
032    public class DeferredObjectTranslator implements Translator
033    {
034        private Translator _objectTranslator;
035    
036        public Object translate(Module module, Class propertyType, String inputValue, Location location)
037        {
038            return new DeferredObjectImpl(_objectTranslator, module, inputValue, location);
039        }
040    
041        public void setObjectTranslator(Translator objectTranslator)
042        {
043            _objectTranslator = objectTranslator;
044        }
045    }