io.trino.sql.tree.MergeCase Maven / Gradle / Ivy

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/*
 * 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 io.trino.sql.tree;

import java.util.List;
import java.util.Optional;

import static java.util.Objects.requireNonNull;

public abstract class MergeCase
        extends Node
{
    protected final Optional expression;

    protected MergeCase(Optional location, Optional expression)
    {
        super(location);
        this.expression = requireNonNull(expression, "expression is null");
    }

    public Optional getExpression()
    {
        return expression;
    }

    @Override
    public  R accept(AstVisitor visitor, C context)
    {
        return visitor.visitMergeCase(this, context);
    }

    public abstract List getSetColumns();

    public abstract List getSetExpressions();
}