/*
 * 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.shardingsphere.sqlfederation.optimizer.operator.util;

import lombok.AccessLevel;
import lombok.RequiredArgsConstructor;
import org.apache.calcite.rel.RelNode;
import org.apache.calcite.rel.RelShuttleImpl;
import org.apache.calcite.rel.core.TableScan;
import org.apache.shardingsphere.sqlfederation.optimizer.operator.logical.LogicalScan;

/**
 * Logical scan rel shuttle.
 */
@RequiredArgsConstructor(access = AccessLevel.PRIVATE)
public final class LogicalScanRelShuttle extends RelShuttleImpl {
    
    private final String databaseType;
    
    @Override
    public RelNode visit(final TableScan tableScan) {
        return new LogicalScan(tableScan, databaseType);
    }
    
    /**
     * Replace table scan with logical scan.
     *
     * @param relNode rel node
     * @param databaseType database type
     * @return replaced rel node
     */
    public static RelNode replace(final RelNode relNode, final String databaseType) {
        return relNode.accept(new LogicalScanRelShuttle(databaseType));
    }
}
