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
015package org.apache.hivemind.schema.rules;
016
017import java.util.Locale;
018
019import org.apache.hivemind.ApplicationRuntimeException;
020import org.apache.hivemind.HiveMind;
021import org.apache.hivemind.Location;
022import org.apache.hivemind.Resource;
023import org.apache.hivemind.internal.Module;
024import 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 */
032public 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}