001    // Copyright 2004, 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.hivemind.schema.rules;
016    
017    import java.util.Locale;
018    
019    import org.apache.hivemind.ApplicationRuntimeException;
020    import org.apache.hivemind.HiveMind;
021    import org.apache.hivemind.Location;
022    import org.apache.hivemind.Resource;
023    import org.apache.hivemind.internal.Module;
024    import org.apache.hivemind.schema.Translator;
025    
026    /**
027     * Translator that converts the value to be a resource relative to 
028     * the contributing module's deployment descriptor.
029     *
030     * @author Howard Lewis Ship
031     */
032    public class ResourceTranslator implements Translator
033    {
034        /**
035         * Finds the resource.  If the inputValue is blank, then returns null.
036         * Interprets the inputValue as a relative path from the contributing module's descriptor.
037         * In addition, a localized resource will be returned if avaiable (localized to
038         * the {@link org.apache.hivemind.Registry#getLocale() registry's locale}.
039         * 
040         */
041        public Object translate(
042            Module contributingModule,
043            Class propertyType,
044            String inputValue,
045            Location location)
046        {
047            if (HiveMind.isBlank(inputValue))
048                return null;
049    
050            Locale locale = contributingModule.getLocale();
051    
052            Resource descriptor = contributingModule.getLocation().getResource();
053    
054            Resource baseResource = descriptor.getRelativeResource(inputValue);
055    
056            Resource result = baseResource.getLocalization(locale);
057    
058            if (result == null)
059                throw new ApplicationRuntimeException(
060                    RulesMessages.resourceLocalizationError(inputValue, contributingModule));
061    
062            return result;
063        }
064    
065    }