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.lib.factory;
016    
017    import org.apache.hivemind.ApplicationRuntimeException;
018    import org.apache.hivemind.HiveMind;
019    import org.apache.hivemind.Location;
020    import org.apache.hivemind.internal.Module;
021    import org.apache.hivemind.lib.BeanFactory;
022    import org.apache.hivemind.service.ObjectProvider;
023    
024    /**
025     * An {@link org.apache.hivemind.service.ObjectProvider}
026     * that references a named (or named and initialized) bean from a 
027     * {@link org.apache.hivemind.lib.BeanFactory}.  The translator string is of the form:
028     * <code>service-id:name[,initializer]</code>. That is, the text after the colon
029     * is an initializer passed to {@link org.apache.hivemind.lib.BeanFactory#get(String)}.
030     *
031     * @author Howard Lewis Ship
032     */
033    public class BeanFactoryObjectProvider implements ObjectProvider
034    {
035        public Object provideObject(
036            Module contributingModule,
037            Class propertyType,
038            String inputValue,
039            Location location)
040        {
041            if (HiveMind.isBlank(inputValue))
042                return null;
043    
044            int colonx = inputValue.indexOf(':');
045    
046            if (colonx < 0)
047                throw new ApplicationRuntimeException(
048                    FactoryMessages.invalidBeanTranslatorFormat(inputValue),
049                    location,
050                    null);
051    
052            String serviceId = inputValue.substring(0, colonx);
053    
054            if (serviceId.length() == 0)
055                throw new ApplicationRuntimeException(
056                    FactoryMessages.invalidBeanTranslatorFormat(inputValue),
057                    location,
058                    null);
059    
060            String locator = inputValue.substring(colonx + 1);
061    
062            if (locator.length() == 0)
063                throw new ApplicationRuntimeException(
064                    FactoryMessages.invalidBeanTranslatorFormat(inputValue),
065                    location,
066                    null);
067    
068            BeanFactory f = (BeanFactory) contributingModule.getService(serviceId, BeanFactory.class);
069    
070            return f.get(locator);
071        }
072    
073    }