| /* |
| * 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.query.dataset.groupby; |
| |
| import org.apache.iotdb.db.qp.physical.crud.GroupByTimePlan; |
| import org.apache.iotdb.db.query.aggregation.AggregateResult; |
| import org.apache.iotdb.db.query.context.QueryContext; |
| import org.apache.iotdb.tsfile.read.common.RowRecord; |
| import org.apache.iotdb.tsfile.read.common.TimeRange; |
| |
| import java.io.IOException; |
| |
| public abstract class GroupByTimeEngineDataSet extends GroupByTimeDataSet { |
| |
| public GroupByTimeEngineDataSet() {} |
| |
| public GroupByTimeEngineDataSet(QueryContext context, GroupByTimePlan groupByTimePlan) { |
| super(context, groupByTimePlan); |
| } |
| |
| @Override |
| public RowRecord nextWithoutConstraint() throws IOException { |
| if (!hasCachedTimeInterval) { |
| throw new IOException( |
| "need to call hasNext() before calling next() in GroupByTimeEngineDataSet."); |
| } |
| hasCachedTimeInterval = false; |
| curAggregateResults = getNextAggregateResult(); |
| return constructRowRecord(curAggregateResults); |
| } |
| |
| protected abstract AggregateResult[] getNextAggregateResult() throws IOException; |
| |
| protected RowRecord constructRowRecord(AggregateResult[] aggregateResultList) { |
| RowRecord record; |
| if (leftCRightO) { |
| record = new RowRecord(curAggrTimeRange.getMin()); |
| } else { |
| record = new RowRecord(curAggrTimeRange.getMax() - 1); |
| } |
| for (AggregateResult res : aggregateResultList) { |
| if (res == null) { |
| record.addField(null); |
| continue; |
| } |
| record.addField(res.getResult(), res.getResultDataType()); |
| } |
| return record; |
| } |
| |
| protected boolean isEndCal() { |
| if (curPreAggrTimeRange.getMin() == -1) { |
| return true; |
| } |
| return ascending |
| ? curPreAggrTimeRange.getMin() >= curAggrTimeRange.getMax() |
| : curPreAggrTimeRange.getMax() <= curAggrTimeRange.getMin(); |
| } |
| |
| // find the next pre-aggregation interval |
| protected void updatePreAggrInterval() { |
| TimeRange retPerAggrTimeRange = null; |
| if (preAggrWindowIterator.hasNextTimeRange()) { |
| retPerAggrTimeRange = preAggrWindowIterator.nextTimeRange(); |
| } |
| if (retPerAggrTimeRange != null) { |
| curPreAggrTimeRange = retPerAggrTimeRange; |
| } else { |
| curPreAggrTimeRange = new TimeRange(-1, -1); |
| } |
| } |
| |
| public AggregateResult[] getCurAggregateResults() { |
| return curAggregateResults; |
| } |
| } |