001    /****************************************************************
002     * Licensed to the Apache Software Foundation (ASF) under one   *
003     * or more contributor license agreements.  See the NOTICE file *
004     * distributed with this work for additional information        *
005     * regarding copyright ownership.  The ASF licenses this file   *
006     * to you under the Apache License, Version 2.0 (the            *
007     * "License"); you may not use this file except in compliance   *
008     * with the License.  You may obtain a copy of the License at   *
009     *                                                              *
010     *   http://www.apache.org/licenses/LICENSE-2.0                 *
011     *                                                              *
012     * Unless required by applicable law or agreed to in writing,   *
013     * software distributed under the License is distributed on an  *
014     * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY       *
015     * KIND, either express or implied.  See the License for the    *
016     * specific language governing permissions and limitations      *
017     * under the License.                                           *
018     ****************************************************************/
019    
020    package org.apache.james.jspf.wiring;
021    
022    
023    import java.lang.reflect.InvocationTargetException;
024    import java.lang.reflect.Method;
025    import java.util.Hashtable;
026    import java.util.Iterator;
027    
028    /**
029     * This class associates "Enabling interfaces" to the service that provides the
030     * dependency.
031     */
032    public class WiringServiceTable extends Hashtable<Class<?>,Object> implements WiringService {
033    
034        private static final long serialVersionUID = -9151935136150279119L;
035    
036        /**
037         * @see org.apache.james.jspf.wiring.WiringService#wire(java.lang.Object)
038         */
039        public void wire(Object component) throws WiringServiceException {
040            Iterator<Class<?>> i = keySet().iterator();
041            while (i.hasNext()) {
042                Class<?> enablingClass = i.next();
043                if (enablingClass.isInstance(component)) {
044                    Method[] m = enablingClass.getDeclaredMethods();
045                    if (m!=null && m.length == 1 && m[0] != null) {
046                        try {
047                            m[0].invoke(component, new Object[] {get(enablingClass)});
048                        } catch (IllegalArgumentException e) {
049                            throw new WiringServiceException("Illegal argument invoking enabled service: "+enablingClass.toString(), e);
050                        } catch (InvocationTargetException e) {
051                            throw new WiringServiceException("Unable to invoke enabled service: "+enablingClass.toString(), e);
052                        } catch (IllegalAccessException e) {
053                            throw new WiringServiceException("Unable to invoke enabled service: "+enablingClass.toString(), e);
054                        }
055                    }
056                }
057            }
058    
059        }
060    
061    }