libraries/sql-generator/src/main/java/org/apache/polygene/library/sql/generator/grammar/manipulation/AlterColumnAction.java

/*
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you 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.apache.polygene.library.sql.generator.grammar.manipulation;

import org.apache.polygene.library.sql.generator.Typeable;

/**
 * This is common interface for column alteration actions.
 *
 * @author Stanislav Muhametsin
 */
public interface AlterColumnAction
    extends Typeable<AlterColumnAction>
{

    /**
     * This syntax element represents dropping column default in table alteration statement.
     *
     * @author Stanislav Muhametsin
     */
    final class DropDefault
        implements AlterColumnAction
    {
        private DropDefault()
        {

        }

        public Class<? extends AlterColumnAction> getImplementedType()
        {
            return DropDefault.class;
        }

        public static final DropDefault INSTANCE = new DropDefault();
    }
}