001/*
002 * (C) Copyright 2014 Nuxeo SA (http://nuxeo.com/) and contributors.
003 *
004 * All rights reserved. This program and the accompanying materials
005 * are made available under the terms of the GNU Lesser General Public License
006 * (LGPL) version 2.1 which accompanies this distribution, and is available at
007 * http://www.gnu.org/licenses/lgpl-2.1.html
008 *
009 * This library is distributed in the hope that it will be useful,
010 * but WITHOUT ANY WARRANTY; without even the implied warranty of
011 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
012 * Lesser General Public License for more details.
013 *
014 * Contributors:
015 *     Nicolas Chapurlat <nchapurlat@nuxeo.com>
016 */
017
018package org.nuxeo.ecm.core.schema.types.resolver;
019
020import java.util.HashMap;
021import java.util.Map;
022
023import org.apache.commons.logging.Log;
024import org.apache.commons.logging.LogFactory;
025import org.nuxeo.runtime.model.ComponentContext;
026import org.nuxeo.runtime.model.ComponentInstance;
027import org.nuxeo.runtime.model.DefaultComponent;
028
029/**
030 * Simple Map base implementation.
031 *
032 * @since 7.1
033 */
034public class ObjectResolverServiceImpl extends DefaultComponent implements ObjectResolverService {
035
036    private static final Log log = LogFactory.getLog(ObjectResolverServiceImpl.class);
037
038    private Map<String, Class<? extends ObjectResolver>> resolvers;
039
040    @Override
041    public void activate(ComponentContext context) {
042        super.activate(context);
043        resolvers = new HashMap<String, Class<? extends ObjectResolver>>();
044    }
045
046    @Override
047    public void registerContribution(Object contribution, String extensionPoint, ComponentInstance contributor) {
048        if (extensionPoint.equals("resolvers")) {
049            ObjectResolverDescriptor erd = (ObjectResolverDescriptor) contribution;
050            resolvers.put(erd.getType(), erd.getResolver());
051        }
052    }
053
054    @Override
055    public void unregisterContribution(Object contribution, String extensionPoint, ComponentInstance contributor) {
056        if (extensionPoint.equals("resolvers")) {
057            ObjectResolverDescriptor erd = (ObjectResolverDescriptor) contribution;
058            resolvers.remove(erd.getType());
059        }
060    }
061
062    @Override
063    public ObjectResolver getResolver(String type, Map<String, String> parameters) {
064        Class<? extends ObjectResolver> resolverClass = resolvers.get(type);
065        if (resolverClass == null) {
066            return null;
067        }
068        ObjectResolver resolver = null;
069        try {
070            resolver = resolverClass.newInstance();
071        } catch (InstantiationException | IllegalAccessException e) {
072            log.warn(String.format("Unable to instanciate %s - missing public constructor with no param",
073                    resolverClass.getCanonicalName()));
074            return null;
075        }
076        try {
077            resolver.configure(parameters != null ? parameters : new HashMap<String, String>());
078        } catch (IllegalArgumentException e) {
079            log.info(String.format("Unable to configure %s with parameters %s", resolverClass.getCanonicalName(),
080                    parameters.toString()));
081            return null;
082        }
083        return resolver;
084    }
085
086}