/*
 * 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 java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import org.apache.phoenix.expression.CoerceExpression;
import org.apache.phoenix.expression.Expression;
import org.apache.phoenix.expression.RowValueConstructorExpression;
import org.apache.phoenix.schema.SortOrder;

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);
  }
}
