| /* |
| * 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; |
| import org.apache.iotdb.tsfile.read.filter.basic.Filter; |
| import org.apache.iotdb.tsfile.read.reader.series.PaginationController; |
| |
| 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; |
| int right = timeColumn.getPositionCount() - 1; |
| int mid; |
| |
| while (left < right) { |
| mid = (left + right) >> 1; |
| if (timeColumn.getLong(mid) < targetTime) { |
| if (ascending) { |
| left = mid + 1; |
| } else { |
| right = mid; |
| } |
| } else if (timeColumn.getLong(mid) > targetTime) { |
| if (ascending) { |
| right = mid; |
| } else { |
| left = mid + 1; |
| } |
| } else if (timeColumn.getLong(mid) == targetTime) { |
| return mid; |
| } |
| } |
| return left; |
| } |
| |
| public static TsBlock applyFilterAndLimitOffsetToTsBlock( |
| TsBlock unFilteredBlock, |
| TsBlockBuilder builder, |
| Filter pushDownFilter, |
| PaginationController paginationController) { |
| boolean[] keepCurrentRow = pushDownFilter.satisfyTsBlock(unFilteredBlock); |
| |
| // construct time column |
| int readEndIndex = |
| buildTimeColumnWithPagination( |
| unFilteredBlock, builder, keepCurrentRow, paginationController); |
| |
| // construct value columns |
| for (int i = 0; i < builder.getValueColumnBuilders().length; i++) { |
| for (int rowIndex = 0; rowIndex < readEndIndex; rowIndex++) { |
| if (keepCurrentRow[rowIndex]) { |
| if (unFilteredBlock.getValueColumns()[i].isNull(rowIndex)) { |
| builder.getColumnBuilder(i).appendNull(); |
| } else { |
| builder |
| .getColumnBuilder(i) |
| .writeObject(unFilteredBlock.getValueColumns()[i].getObject(rowIndex)); |
| } |
| } |
| } |
| } |
| return builder.build(); |
| } |
| |
| private static int buildTimeColumnWithPagination( |
| TsBlock unFilteredBlock, |
| TsBlockBuilder builder, |
| boolean[] keepCurrentRow, |
| PaginationController paginationController) { |
| int readEndIndex = unFilteredBlock.getPositionCount(); |
| for (int rowIndex = 0; rowIndex < readEndIndex; rowIndex++) { |
| if (keepCurrentRow[rowIndex]) { |
| if (paginationController.hasCurOffset()) { |
| paginationController.consumeOffset(); |
| keepCurrentRow[rowIndex] = false; |
| } else if (paginationController.hasCurLimit()) { |
| builder.getTimeColumnBuilder().writeLong(unFilteredBlock.getTimeByIndex(rowIndex)); |
| builder.declarePosition(); |
| paginationController.consumeLimit(); |
| } else { |
| readEndIndex = rowIndex; |
| break; |
| } |
| } |
| } |
| return readEndIndex; |
| } |
| } |