# RemoveNamedAssociation.java

    /*
     * Copyright (c) 2014, Paul Merlin. 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 java.util.Map;
    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.StateStore;

    /**
     * Add a named-association
     */
    public class RemoveNamedAssociation
        implements EntityMigrationOperation
    {
        private final String association;
        private final Map<String, String> defaultReferences;

        public RemoveNamedAssociation( String association, Map<String, String> defaultReferences )
        {
            this.association = association;
            this.defaultReferences = defaultReferences;
        }

        @Override
        public boolean upgrade( JSONObject state, StateStore stateStore, Migrator migrator )
            throws JSONException
        {
            return migrator.removeNamedAssociation( state, association );
        }

        @Override
        public boolean downgrade( JSONObject state, StateStore stateStore, Migrator migrator )
            throws JSONException
        {
            return migrator.addNamedAssociation( state, association, defaultReferences );
        }

        @Override
        public String toString()
        {
            return "Remove named-association " + association + ", default:" + defaultReferences;
        }
    }