org.jboss.marshalling.AnnotationClassExternalizerFactory Maven / Gradle / Ivy

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/*
 * JBoss, Home of Professional Open Source
 * Copyright 2008, JBoss Inc., and individual contributors as indicated
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

package org.jboss.marshalling;

/**
 * An externalizer factory which looks for the presence of the {@link org.jboss.marshalling.Externalize Externalize} annotation.
 */
public class AnnotationClassExternalizerFactory implements ClassExternalizerFactory {

    /**
     * Construct a new instance.
     */
    public AnnotationClassExternalizerFactory() {
    }

    /** {@inheritDoc} */
    public Externalizer getExternalizer(final Class type) {
        final Externalize ann = type.getAnnotation(Externalize.class);
        if (ann == null) {
            return null;
        } else {
            try {
                return ann.value().newInstance();
            } catch (Exception e) {
                throw new IllegalArgumentException("Cannot instantiate externalizer for " + type, e);
            }
        }
    }
}