/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2012, Red Hat, Inc., and individual contributors
 * as indicated by the @author tags. See the copyright.txt file 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.wildfly.clustering.marshalling.spi.io;

import java.io.Externalizable;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;

import org.wildfly.clustering.marshalling.Externalizer;
import org.wildfly.security.manager.WildFlySecurityManager;

/**
 * Externalizer for Externalizable objects.
 * @author Paul Ferraro
 */
public class ExternalizableExternalizer<T extends Externalizable> implements Externalizer<T> {

    private final Class<T> targetClass;

    public ExternalizableExternalizer(Class<T> targetClass) {
        this.targetClass = targetClass;
    }

    @Override
    public void writeObject(ObjectOutput output, T object) throws IOException {
        object.writeExternal(output);
    }

    @Override
    public T readObject(ObjectInput input) throws IOException, ClassNotFoundException {
        PrivilegedExceptionAction<T> action = new PrivilegedExceptionAction<T>() {
            @Override
            public T run() throws InstantiationException, IllegalAccessException {
                return ExternalizableExternalizer.this.getTargetClass().newInstance();
            }
        };
        try {
            T object = WildFlySecurityManager.doChecked(action);
            object.readExternal(input);
            return object;
        } catch (PrivilegedActionException e) {
            throw new IOException(e.getCause());
        }
    }

    @Override
    public Class<T> getTargetClass() {
        return this.targetClass;
    }
}