| /* |
| * 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.statement.component; |
| |
| import org.apache.iotdb.db.queryengine.plan.expression.Expression; |
| |
| import org.apache.tsfile.utils.ReadWriteIOUtils; |
| |
| import java.io.DataOutputStream; |
| import java.io.IOException; |
| import java.nio.ByteBuffer; |
| import java.util.Objects; |
| |
| public class SortItem { |
| |
| private String sortKey; |
| private final Ordering ordering; |
| private final NullOrdering nullOrdering; |
| |
| // only used in analyzing period |
| private Expression expression; |
| |
| public SortItem(String sortKey, Ordering ordering) { |
| this(sortKey, ordering, NullOrdering.LAST); |
| } |
| |
| public SortItem(String sortKey, Ordering ordering, NullOrdering nullOrdering) { |
| this.sortKey = sortKey; |
| this.ordering = ordering; |
| this.nullOrdering = nullOrdering; |
| } |
| |
| public SortItem(Expression expression, Ordering ordering, NullOrdering nullOrdering) { |
| this.expression = expression; |
| this.ordering = ordering; |
| this.nullOrdering = nullOrdering; |
| this.sortKey = expression.getExpressionString(); |
| } |
| |
| public String getSortKey() { |
| return sortKey; |
| } |
| |
| public Ordering getOrdering() { |
| return ordering; |
| } |
| |
| public NullOrdering getNullOrdering() { |
| return nullOrdering; |
| } |
| |
| public void setExpression(Expression expression) { |
| this.expression = expression; |
| this.sortKey = expression.getExpressionString(); |
| } |
| |
| public Expression getExpression() { |
| return expression; |
| } |
| |
| public boolean isExpression() { |
| return expression != null; |
| } |
| |
| public SortItem reverse() { |
| return new SortItem(getSortKey(), getOrdering().reverse(), getNullOrdering().reverse()); |
| } |
| |
| public void serialize(ByteBuffer byteBuffer) { |
| ReadWriteIOUtils.write(sortKey, byteBuffer); |
| ReadWriteIOUtils.write(ordering.ordinal(), byteBuffer); |
| ReadWriteIOUtils.write(nullOrdering.ordinal(), byteBuffer); |
| } |
| |
| public void serialize(DataOutputStream stream) throws IOException { |
| ReadWriteIOUtils.write(sortKey, stream); |
| ReadWriteIOUtils.write(ordering.ordinal(), stream); |
| ReadWriteIOUtils.write(nullOrdering.ordinal(), stream); |
| } |
| |
| public static SortItem deserialize(ByteBuffer byteBuffer) { |
| String sortKey = ReadWriteIOUtils.readString(byteBuffer); |
| Ordering ordering = Ordering.values()[ReadWriteIOUtils.readInt(byteBuffer)]; |
| NullOrdering nullOrdering = NullOrdering.values()[ReadWriteIOUtils.readInt(byteBuffer)]; |
| return new SortItem(sortKey, ordering, nullOrdering); |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| if (this == o) { |
| return true; |
| } |
| if (o == null || getClass() != o.getClass()) { |
| return false; |
| } |
| SortItem sortItem = (SortItem) o; |
| return Objects.equals(sortKey, sortItem.sortKey) |
| && ordering == sortItem.ordering |
| && nullOrdering == sortItem.nullOrdering; |
| } |
| |
| @Override |
| public int hashCode() { |
| return Objects.hash(sortKey, ordering, nullOrdering); |
| } |
| |
| public String toSQLString() { |
| return getSortKey() + " " + getOrdering().toString() + " " + getNullOrdering().toString(); |
| } |
| } |