PubSubProviderDescriptor.java

/*
 * (C) Copyright 2017 Nuxeo (http://nuxeo.com/) and others.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * Contributors:
 *     Florent Guillaume
 */
package org.nuxeo.ecm.core.pubsub;

import org.nuxeo.common.xmap.annotation.XNode;
import org.nuxeo.common.xmap.annotation.XObject;
import org.nuxeo.ecm.core.api.NuxeoException;

/**
 * Descriptor for a {@link PubSubProvider} implementation.
 *
 * @since 9.1
 */
@XObject("provider")
public class PubSubProviderDescriptor {

    @XNode("@class")
    public Class<? extends PubSubProvider> klass;

    public PubSubProvider getInstance() {
        // dynamic class check, the generics aren't enough
        if (!PubSubProvider.class.isAssignableFrom(klass)) {
            throw new NuxeoException("Class does not implement PubSubServiceProvider: " + klass.getName());
        }
        try {
            return klass.newInstance();
        } catch (ReflectiveOperationException e) {
            throw new NuxeoException(e);
        }
    }

}