001/*
002 * (C) Copyright 2017 Nuxeo (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 *     Florent Guillaume
018 */
019package org.nuxeo.ecm.core.pubsub;
020
021import org.nuxeo.common.xmap.annotation.XNode;
022import org.nuxeo.common.xmap.annotation.XObject;
023import org.nuxeo.ecm.core.api.NuxeoException;
024
025/**
026 * Descriptor for a {@link PubSubProvider} implementation.
027 *
028 * @since 9.1
029 */
030@XObject("provider")
031public class PubSubProviderDescriptor {
032
033    @XNode("@class")
034    public Class<? extends PubSubProvider> klass;
035
036    public PubSubProvider getInstance() {
037        // dynamic class check, the generics aren't enough
038        if (!PubSubProvider.class.isAssignableFrom(klass)) {
039            throw new NuxeoException("Class does not implement PubSubServiceProvider: " + klass.getName());
040        }
041        try {
042            return klass.newInstance();
043        } catch (ReflectiveOperationException e) {
044            throw new NuxeoException(e);
045        }
046    }
047
048}