| /* |
| * 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.tsfile.utils.ReadWriteIOUtils; |
| |
| import java.io.DataOutputStream; |
| import java.io.IOException; |
| import java.nio.ByteBuffer; |
| |
| /** |
| * This attribute indicates the input and output type of the {@code Aggregator}. |
| * |
| * <p>There are three types of input/output: |
| * |
| * <ul> |
| * <li>Raw: raw data, as input only |
| * <li>Partial: intermediate aggregation result |
| * <li>Final: final aggregation result |
| * </ul> |
| */ |
| public enum AggregationStep { |
| |
| // input Raw, output Partial |
| PARTIAL(InputType.RAW, true, (byte) 0), |
| // input Partial, output Final |
| FINAL(InputType.PARTIAL, false, (byte) 1), |
| // input Partial, output Partial |
| INTERMEDIATE(InputType.PARTIAL, true, (byte) 2), |
| // input Raw, output Final |
| SINGLE(InputType.RAW, false, (byte) 3), |
| // input final, output final |
| STATIC(InputType.FINAL, false, (byte) 4); |
| |
| private enum InputType { |
| RAW, |
| PARTIAL, |
| FINAL |
| } |
| |
| private final InputType inputType; |
| private final boolean outputPartial; |
| private final byte ordinal; |
| |
| AggregationStep(InputType inputType, boolean outputPartial, byte ordinal) { |
| this.inputType = inputType; |
| this.outputPartial = outputPartial; |
| this.ordinal = ordinal; |
| } |
| |
| public boolean isInputRaw() { |
| return inputType == InputType.RAW; |
| } |
| |
| public boolean isInputPartial() { |
| return inputType == InputType.PARTIAL; |
| } |
| |
| public boolean isInputFinal() { |
| return inputType == InputType.FINAL; |
| } |
| |
| public boolean isOutputPartial() { |
| return outputPartial; |
| } |
| |
| public void serialize(ByteBuffer byteBuffer) { |
| ReadWriteIOUtils.write(ordinal, byteBuffer); |
| } |
| |
| public void serialize(DataOutputStream stream) throws IOException { |
| ReadWriteIOUtils.write(ordinal, stream); |
| } |
| |
| public static AggregationStep deserialize(ByteBuffer byteBuffer) { |
| byte type = ReadWriteIOUtils.readByte(byteBuffer); |
| switch (type) { |
| case 0: |
| return AggregationStep.PARTIAL; |
| case 1: |
| return AggregationStep.FINAL; |
| case 2: |
| return AggregationStep.INTERMEDIATE; |
| case 3: |
| return AggregationStep.SINGLE; |
| case 4: |
| return AggregationStep.STATIC; |
| default: |
| throw new IllegalArgumentException("Invalid AggregationStep type: " + type); |
| } |
| } |
| } |