/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2013, 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.jboss.as.patching.runner;

import java.io.IOException;

import org.jboss.as.patching.metadata.ContentModification;
import org.jboss.as.patching.metadata.ModificationType;
import org.jboss.as.patching.metadata.ModuleItem;

/**
 * Task used to find the active modules and record them as part of the invalidation roots.
 *
 * @author Emanuel Muckenhuber
 */
class ModuleRollbackTask extends AbstractModuleTask {

    public ModuleRollbackTask(PatchingTaskDescription description) {
        super(description);
    }

    @Override
    protected byte[] notFound(ModuleItem contentItem) throws IOException {
        // Maybe just don't record the original ADD as part of the history?
        if (description.getModificationType() == ModificationType.REMOVE) {
            return contentItem.getContentHash();
        }
        return super.notFound(contentItem);
    }

    @Override
    byte[] apply(final PatchingTaskContext context, final PatchContentLoader loader) throws IOException {
        return getContentItem().getContentHash();
    }

    @Override
    ContentModification createRollbackEntry(ContentModification original, byte[] targetHash, byte[] itemHash) {
        return null;
    }
}