| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * https://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| * |
| */ |
| package org.apache.directory.fortress.core.rest; |
| |
| import java.util.Hashtable; |
| |
| import jakarta.xml.bind.JAXBContext; |
| import jakarta.xml.bind.JAXBException; |
| import jakarta.xml.bind.Marshaller; |
| import jakarta.xml.bind.Unmarshaller; |
| |
| /** |
| * This class contains a very simple caching mechanism for storing JAXBContext objects associated with Fortress XML |
| * processing. |
| * The intent is to reduce the performance penalty for calling JAXBContext.newInstance( class ); |
| * <p> |
| * This class is thread safe. |
| * |
| * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> |
| */ |
| @SuppressWarnings( "rawtypes" ) |
| public class CachedJaxbContext |
| { |
| |
| private static volatile Hashtable<Class, JAXBCachedEntry> jaxbInstanceCache = new Hashtable(); |
| |
| /** |
| * Once constructed this object can be stored as static member of class that performs JAX XML processing. |
| * |
| * @param type contains the class name that is being marshalled/unmarshalled. * |
| * @return handle to JAXBContext to be used to marshall or unmarshall XML data. |
| * @throws JAXBException in the event the JAXBContext cannot be obtained. |
| */ |
| public synchronized JAXBContext getJaxbContext( Class type ) throws JAXBException |
| { |
| |
| JAXBCachedEntry cache = jaxbInstanceCache.get( type ); |
| if ( cache == null ) |
| { |
| cache = new JAXBCachedEntry( type ); |
| jaxbInstanceCache.put( type, cache ); |
| return cache.getContext(); |
| } |
| return cache.getContext(); |
| } |
| |
| /** |
| * Return a handle to JAXB unmarshaller for a particular data type. JAXBContext itself is thread safe. |
| * |
| * @param type contains the class name associated with a particular data type. |
| * @return handel to JAXB unmarshaller. |
| * @throws JAXBException in the event the unmarshaller cannot be retrieved. |
| */ |
| public Unmarshaller createUnMarshaller( Class type ) throws JAXBException |
| { |
| JAXBContext context = getJaxbContext( type ); |
| return context.createUnmarshaller(); |
| } |
| |
| |
| /** |
| * Return a handle to JAXB unmarshaller for a particular data type. JAXBContext itself is thread safe. |
| * |
| * @param type contains the class name associated with a particular data type. |
| * @return handel to JAXB marshaller. |
| * @throws JAXBException in the event the marshaller cannot be retrieved. |
| */ |
| public Marshaller createMarshaller( Class type ) throws JAXBException |
| { |
| JAXBContext context = getJaxbContext( type ); |
| return context.createMarshaller(); |
| } |
| } |