001/*
002 * (C) Copyright 2006-2010 Nuxeo SA (http://nuxeo.com/) and others.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 *
016 * Contributors:
017 *     bstefanescu
018 */
019package org.nuxeo.ecm.automation.client;
020
021import java.lang.reflect.ParameterizedType;
022import java.lang.reflect.Type;
023import java.util.HashSet;
024import java.util.Set;
025
026/**
027 * @author <a href="mailto:[email protected]">Bogdan Stefanescu</a>
028 */
029public class AdapterManager {
030
031    protected final Set<AdapterFactory<?>> factories = new HashSet<AdapterFactory<?>>();
032
033    // put(BusinessObjectService.class,
034    public <T> T getAdapter(Session session, Class<T> adapterType) {
035        for (AdapterFactory<?> f : factories) {
036            if (!factoryAccept(f, adapterType)) {
037                continue;
038            }
039            @SuppressWarnings("unchecked")
040            AdapterFactory<T> tFactory = (AdapterFactory<T>) f;
041            return adapterType.cast(tFactory.getAdapter(session, adapterType));
042        }
043        return null;
044    }
045
046    protected boolean factoryAccept(AdapterFactory<?> factory, Class<?> adapterType) {
047        ParameterizedType itf = (ParameterizedType) factory.getClass().getGenericInterfaces()[0];
048        Type type = itf.getActualTypeArguments()[0];
049        Class<?> clazz;
050        if (type instanceof Class) {
051            clazz = (Class<?>) type;
052        } else if (type instanceof ParameterizedType) {
053            clazz = (Class<?>) ((ParameterizedType) type).getRawType();
054        } else {
055            throw new UnsupportedOperationException("Don't know how to handle " + type.getClass());
056        }
057        return clazz.isAssignableFrom(adapterType);
058    }
059
060    public void registerAdapter(AdapterFactory<?> factory) {
061        factories.add(factory);
062    }
063
064    public void clear() {
065        factories.clear();
066    }
067
068}