| /* |
| * 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.tsfile.read.common.block; |
| |
| import org.apache.iotdb.tsfile.read.common.TimeRange; |
| import org.apache.iotdb.tsfile.read.common.block.column.TimeColumn; |
| |
| public class TsBlockUtil { |
| |
| private TsBlockUtil() { |
| // forbidding instantiation |
| } |
| |
| /** Skip lines at the beginning of the tsBlock that are not in the time range. */ |
| public static TsBlock skipPointsOutOfTimeRange( |
| TsBlock tsBlock, TimeRange targetTimeRange, boolean ascending) { |
| int firstIndex = getFirstConditionIndex(tsBlock, targetTimeRange, ascending); |
| return tsBlock.subTsBlock(firstIndex); |
| } |
| |
| // If ascending, find the index of first greater than or equal to targetTime |
| // else, find the index of first less than or equal to targetTime |
| public static int getFirstConditionIndex( |
| TsBlock tsBlock, TimeRange targetTimeRange, boolean ascending) { |
| TimeColumn timeColumn = tsBlock.getTimeColumn(); |
| long targetTime = ascending ? targetTimeRange.getMin() : targetTimeRange.getMax(); |
| int left = 0, right = timeColumn.getPositionCount() - 1, mid; |
| |
| while (left < right) { |
| mid = (left + right) >> 1; |
| if (timeColumn.getLongWithoutCheck(mid) < targetTime) { |
| if (ascending) { |
| left = mid + 1; |
| } else { |
| right = mid; |
| } |
| } else if (timeColumn.getLongWithoutCheck(mid) > targetTime) { |
| if (ascending) { |
| right = mid; |
| } else { |
| left = mid + 1; |
| } |
| } else if (timeColumn.getLongWithoutCheck(mid) == targetTime) { |
| return mid; |
| } |
| } |
| return left; |
| } |
| } |