001/*
002 * (C) Copyright 2014 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 *     Nicolas Chapurlat <nchapurlat@nuxeo.com>
018 */
019
020package org.nuxeo.ecm.core.schema.types.resolver;
021
022import java.util.HashMap;
023import java.util.Map;
024
025import org.apache.commons.logging.Log;
026import org.apache.commons.logging.LogFactory;
027import org.nuxeo.runtime.model.ComponentContext;
028import org.nuxeo.runtime.model.ComponentInstance;
029import org.nuxeo.runtime.model.DefaultComponent;
030
031/**
032 * Simple Map base implementation.
033 *
034 * @since 7.1
035 */
036public class ObjectResolverServiceImpl extends DefaultComponent implements ObjectResolverService {
037
038    private static final Log log = LogFactory.getLog(ObjectResolverServiceImpl.class);
039
040    private Map<String, Class<? extends ObjectResolver>> resolvers;
041
042    @Override
043    public void activate(ComponentContext context) {
044        super.activate(context);
045        resolvers = new HashMap<String, Class<? extends ObjectResolver>>();
046    }
047
048    @Override
049    public void registerContribution(Object contribution, String extensionPoint, ComponentInstance contributor) {
050        if (extensionPoint.equals("resolvers")) {
051            ObjectResolverDescriptor erd = (ObjectResolverDescriptor) contribution;
052            resolvers.put(erd.getType(), erd.getResolver());
053        }
054    }
055
056    @Override
057    public void unregisterContribution(Object contribution, String extensionPoint, ComponentInstance contributor) {
058        if (extensionPoint.equals("resolvers")) {
059            ObjectResolverDescriptor erd = (ObjectResolverDescriptor) contribution;
060            resolvers.remove(erd.getType());
061        }
062    }
063
064    @Override
065    public ObjectResolver getResolver(String type, Map<String, String> parameters) {
066        Class<? extends ObjectResolver> resolverClass = resolvers.get(type);
067        if (resolverClass == null) {
068            return null;
069        }
070        ObjectResolver resolver = null;
071        try {
072            resolver = resolverClass.newInstance();
073        } catch (InstantiationException | IllegalAccessException e) {
074            log.warn(String.format("Unable to instanciate %s - missing public constructor with no param",
075                    resolverClass.getCanonicalName()));
076            return null;
077        }
078        try {
079            resolver.configure(parameters != null ? parameters : new HashMap<String, String>());
080        } catch (IllegalArgumentException e) {
081            log.info(String.format("Unable to configure %s with parameters %s", resolverClass.getCanonicalName(),
082                    parameters.toString()));
083            return null;
084        }
085        return resolver;
086    }
087
088}