| /* |
| * 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.iotdb.db.queryengine.plan.planner.plan.parameter; |
| |
| import org.apache.iotdb.db.queryengine.plan.statement.component.SortItem; |
| import org.apache.iotdb.tsfile.utils.ReadWriteIOUtils; |
| |
| import java.io.DataOutputStream; |
| import java.io.IOException; |
| import java.nio.ByteBuffer; |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.Objects; |
| |
| public class OrderByParameter { |
| |
| // items closer to the list head have higher priority |
| private final List<SortItem> sortItemList; |
| |
| public OrderByParameter(List<SortItem> sortItemList) { |
| this.sortItemList = sortItemList; |
| } |
| |
| public OrderByParameter() { |
| this.sortItemList = new ArrayList<>(); |
| } |
| |
| public List<SortItem> getSortItemList() { |
| return sortItemList; |
| } |
| |
| public boolean isEmpty() { |
| return sortItemList.isEmpty(); |
| } |
| |
| @Override |
| public String toString() { |
| StringBuilder sortInfo = new StringBuilder("OrderBy:"); |
| for (SortItem sortItem : sortItemList) { |
| sortInfo.append(" "); |
| sortInfo.append(sortItem.toSQLString()); |
| } |
| return sortInfo.toString(); |
| } |
| |
| public void serializeAttributes(ByteBuffer byteBuffer) { |
| ReadWriteIOUtils.write(sortItemList.size(), byteBuffer); |
| for (SortItem sortItem : sortItemList) { |
| sortItem.serialize(byteBuffer); |
| } |
| } |
| |
| public void serializeAttributes(DataOutputStream stream) throws IOException { |
| ReadWriteIOUtils.write(sortItemList.size(), stream); |
| for (SortItem sortItem : sortItemList) { |
| sortItem.serialize(stream); |
| } |
| } |
| |
| public static OrderByParameter deserialize(ByteBuffer byteBuffer) { |
| int sortItemSize = ReadWriteIOUtils.readInt(byteBuffer); |
| List<SortItem> sortItemList = new ArrayList<>(sortItemSize); |
| while (sortItemSize > 0) { |
| sortItemList.add(SortItem.deserialize(byteBuffer)); |
| sortItemSize--; |
| } |
| return new OrderByParameter(sortItemList); |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| if (this == o) { |
| return true; |
| } |
| if (o == null || getClass() != o.getClass()) { |
| return false; |
| } |
| OrderByParameter that = (OrderByParameter) o; |
| return sortItemList.equals(that.sortItemList); |
| } |
| |
| @Override |
| public int hashCode() { |
| return Objects.hash(sortItemList); |
| } |
| } |