# RenameEntity.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.operation;

    import org.json.JSONException;
    import org.json.JSONObject;
    import org.qi4j.migration.Migrator;
    import org.qi4j.migration.assembly.EntityMigrationOperation;
    import org.qi4j.spi.entitystore.helpers.JSONKeys;
    import org.qi4j.spi.entitystore.helpers.StateStore;

    /**
     * Rename an Entity type
     */
    public class RenameEntity
        implements EntityMigrationOperation
    {
        String fromName;
        String toName;

        public RenameEntity( String fromName, String toName )
        {
            this.fromName = fromName;
            this.toName = toName;
        }

        @Override
        public boolean upgrade( JSONObject state, StateStore stateStore, Migrator migrator )
            throws JSONException
        {
            String type = state.getString( JSONKeys.TYPE );

            if( type.equals( fromName ) )
            {
                migrator.changeEntityType( state, toName );
                return true;
            }
            else
            {
                return false;
            }
        }

        @Override
        public boolean downgrade( JSONObject state, StateStore stateStore, Migrator migrator )
            throws JSONException
        {
            String type = state.getString( JSONKeys.TYPE );

            if( type.equals( toName ) )
            {
                migrator.changeEntityType( state, fromName );
                return true;
            }
            else
            {
                return false;
            }
        }

        @Override
        public String toString()
        {
            return "Rename entity " + fromName + " to " + toName;
        }
    }