# MigrationRule.java

    /*
     * Copyright (c) 2009, Rickard Öberg. All Rights Reserved.
     *
     * 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.
     *
     */

    package org.qi4j.migration.assembly;

    import java.io.IOException;
    import org.qi4j.migration.Migrator;
    import org.qi4j.spi.entitystore.helpers.StateStore;

    /**
     * Migration rule that does not apply to a specific entity type
     */
    public class MigrationRule
        extends AbstractMigrationRule
    {
        private MigrationOperation operation;

        public MigrationRule( String fromVersion, String toVersion, MigrationOperation operation )
        {
            super( fromVersion, toVersion );
            this.operation = operation;
        }

        public void upgrade( StateStore stateStore, Migrator migrator )
            throws IOException
        {
            operation.upgrade( stateStore, migrator );
        }

        public void downgrade( StateStore stateStore, Migrator migrator )
            throws IOException
        {
            operation.downgrade( stateStore, migrator );
        }

        @Override
        public String toString()
        {
            return fromVersion + "->" + toVersion + ":" + operation;
        }
    }