/*
 * 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.phoenix.expression.rewrite;

import org.apache.phoenix.expression.CoerceExpression;
import org.apache.phoenix.expression.Expression;
import org.apache.phoenix.expression.RowValueConstructorExpression;
import org.apache.phoenix.schema.SortOrder;

import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

public class RowValueConstructorExpressionRewriter {

    static RowValueConstructorExpressionRewriter singleton = null;

    public static RowValueConstructorExpressionRewriter getSingleton() {
        if (singleton == null) {
            singleton = new RowValueConstructorExpressionRewriter();
        }
        return singleton;
    }

    public RowValueConstructorExpression rewriteAllChildrenAsc(
            RowValueConstructorExpression rvcExpression) throws SQLException {
        List<Expression> replacementChildren = new ArrayList<>(rvcExpression.getChildren().size());
        for (int i = 0; i < rvcExpression.getChildren().size(); i++) {
            Expression child = rvcExpression.getChildren().get(i);
            if (child.getSortOrder() == SortOrder.DESC) {
                //As The KeySlot visitor has not been setup for InvertFunction need to Use Coerce
                child = CoerceExpression.create(child, child.getDataType(), SortOrder.ASC, null);
            }
            replacementChildren.add(child);
        }
        return rvcExpression.clone(replacementChildren);
    }
}
