/*
    * Copyright 2021 TiKV Project Authors.
    *
    * 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 org.tikv.common.expression;
  
  import static com.google.common.base.Preconditions.checkNotNull;
  
  import java.io.Serializable;
  import org.tikv.common.expression.visitor.ProtoConverter;
  
  public class ByItem implements Serializable {
    private final Expression expr;
    private final boolean desc;
  
    private ByItem(Expression expr, boolean desc) {
      checkNotNull(expr, "Expr cannot be null for ByItem");
  
      this.expr = expr;
      this.desc = desc;
    }
  
    public static ByItem create(Expression expr, boolean desc) {
      return new ByItem(expr, desc);
    }
  
    public com.pingcap.tidb.tipb.ByItem toProto(Object context) {
      com.pingcap.tidb.tipb.ByItem.Builder builder = com.pingcap.tidb.tipb.ByItem.newBuilder();
      return builder.setExpr(ProtoConverter.toProto(expr, context)).setDesc(desc).build();
    }
  
    public Expression getExpr() {
      return expr;
    }
  
    public boolean isDesc() {
      return desc;
    }
  
    @Override
    public String toString() {
      return String.format("[%s %s]", expr.toString(), desc ? "DESC" : "ASC");
    }
  }