| /* |
| * 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.execution.operator.schema.source; |
| |
| import org.apache.iotdb.db.queryengine.common.header.ColumnHeader; |
| import org.apache.iotdb.db.schemaengine.schemaregion.ISchemaRegion; |
| import org.apache.iotdb.db.schemaengine.schemaregion.read.resp.info.ISchemaInfo; |
| import org.apache.iotdb.db.schemaengine.schemaregion.read.resp.reader.ISchemaReader; |
| |
| import org.apache.tsfile.read.common.block.TsBlockBuilder; |
| |
| import java.util.List; |
| |
| public interface ISchemaSource<T extends ISchemaInfo> { |
| |
| /** |
| * Get the SchemaReader for iterating target SchemaInfo from given SchemaRegion. |
| * |
| * @return the SchemaReader for SchemaInfo T |
| */ |
| ISchemaReader<T> getSchemaReader(ISchemaRegion schemaRegion); |
| |
| /** Get the column headers of the result TsBlock for SchemaInfo query. */ |
| List<ColumnHeader> getInfoQueryColumnHeaders(); |
| |
| /** |
| * Transform the SchemaInfo T to fill the TsBlock. |
| * |
| * @param schemaInfo the SchemaInfo need to be processed |
| * @param tsBlockBuilder the target TsBlockBuilder using for generating TsBlock |
| * @param database the belonged databased of given SchemaInfo |
| */ |
| void transformToTsBlockColumns(T schemaInfo, TsBlockBuilder tsBlockBuilder, String database); |
| |
| boolean hasSchemaStatistic(ISchemaRegion schemaRegion); |
| |
| long getSchemaStatistic(ISchemaRegion schemaRegion); |
| } |