extensions/migration/src/main/java/org/qi4j/migration/operation/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;
    }
}