| /* |
| * 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.analyze.schema; |
| |
| import org.apache.iotdb.commons.path.PartialPath; |
| import org.apache.iotdb.commons.schema.view.LogicalViewSchema; |
| import org.apache.iotdb.db.queryengine.common.schematree.IMeasurementSchemaInfo; |
| import org.apache.iotdb.tsfile.utils.Pair; |
| |
| import java.util.List; |
| |
| /** |
| * This interface defines the required behaviour invoked during schema fetch/computation, which is |
| * executed by schema fetcher. |
| */ |
| public interface ISchemaComputation { |
| |
| PartialPath getDevicePath(); |
| |
| String[] getMeasurements(); |
| |
| /** @param isAligned whether the fetched device is aligned */ |
| void computeDevice(boolean isAligned); |
| |
| /** |
| * @param index the index of fetched measurement in array returned by getMeasurements |
| * @param measurementSchemaInfo the measurement schema of fetched measurement |
| */ |
| void computeMeasurement(int index, IMeasurementSchemaInfo measurementSchemaInfo); |
| |
| // region used by logical view |
| boolean hasLogicalViewNeedProcess(); |
| |
| /** |
| * @return the logical view schema list recorded by this statement. It may be NULL if it is not |
| * used before. |
| */ |
| List<LogicalViewSchema> getLogicalViewSchemaList(); |
| |
| /** |
| * @return the index list of logical view paths, where source of views should be placed. For |
| * example, IndexListOfLogicalViewPaths[alpha] = beta, then you should use |
| * LogicalViewSchemaList[alpha] to fill measurementSchema[beta]. |
| */ |
| List<Integer> getIndexListOfLogicalViewPaths(); |
| |
| /** |
| * Record the beginning and ending of logical schema list. After calling this interface, the range |
| * should be record. For example, the range is [0,4) which means 4 schemas exist. Later, more 3 |
| * schemas are added, this function is called, then it records [4,7). |
| */ |
| void recordRangeOfLogicalViewSchemaListNow(); |
| |
| /** @return the recorded range of logical view schema list. */ |
| Pair<Integer, Integer> getRangeOfLogicalViewSchemaListRecorded(); |
| |
| /** |
| * @param index the index of fetched measurement in array returned by getMeasurements |
| * @param measurementSchemaInfo the measurement schema of source of the logical view |
| * @param isAligned whether the source of this view is aligned. |
| */ |
| void computeMeasurementOfView( |
| int index, IMeasurementSchemaInfo measurementSchemaInfo, boolean isAligned); |
| // endregion |
| } |