server/src/main/java/org/apache/iotdb/db/mpp/plan/execution/config/metadata/template/ShowNodesInSchemaTemplateTask.java

/*
 * 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
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package org.apache.iotdb.db.mpp.plan.execution.config.metadata.template;

import org.apache.iotdb.db.metadata.template.Template;
import org.apache.iotdb.db.mpp.common.header.ColumnHeader;
import org.apache.iotdb.db.mpp.common.header.ColumnHeaderConstant;
import org.apache.iotdb.db.mpp.common.header.DatasetHeader;
import org.apache.iotdb.db.mpp.common.header.DatasetHeaderFactory;
import org.apache.iotdb.db.mpp.plan.execution.config.ConfigTaskResult;
import org.apache.iotdb.db.mpp.plan.execution.config.IConfigTask;
import org.apache.iotdb.db.mpp.plan.execution.config.executor.IConfigTaskExecutor;
import org.apache.iotdb.db.mpp.plan.statement.metadata.template.ShowNodesInSchemaTemplateStatement;
import org.apache.iotdb.rpc.TSStatusCode;
import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType;
import org.apache.iotdb.tsfile.read.common.block.TsBlockBuilder;
import org.apache.iotdb.tsfile.utils.Binary;
import org.apache.iotdb.tsfile.write.schema.IMeasurementSchema;

import com.google.common.util.concurrent.ListenableFuture;
import com.google.common.util.concurrent.SettableFuture;

import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

public class ShowNodesInSchemaTemplateTask implements IConfigTask {

  private final ShowNodesInSchemaTemplateStatement showNodesInSchemaTemplateStatement;

  public ShowNodesInSchemaTemplateTask(
      ShowNodesInSchemaTemplateStatement showNodesInSchemaTemplateStatement) {
    this.showNodesInSchemaTemplateStatement = showNodesInSchemaTemplateStatement;
  }

  @Override
  public ListenableFuture<ConfigTaskResult> execute(IConfigTaskExecutor configTaskExecutor)
      throws InterruptedException {
    return configTaskExecutor.showNodesInSchemaTemplate(this.showNodesInSchemaTemplateStatement);
  }

  public static void buildTSBlock(Template template, SettableFuture<ConfigTaskResult> future) {
    List<TSDataType> outputDataTypes =
        ColumnHeaderConstant.showNodesInSchemaTemplateHeaders.stream()
            .map(ColumnHeader::getColumnType)
            .collect(Collectors.toList());
    TsBlockBuilder builder = new TsBlockBuilder(outputDataTypes);
    try {
      if (template != null) {
        // template.get
        for (Map.Entry<String, IMeasurementSchema> entry : template.getSchemaMap().entrySet()) {
          String keyName = entry.getKey();
          IMeasurementSchema measurementSchema = entry.getValue();
          builder.getTimeColumnBuilder().writeLong(0L);
          builder.getColumnBuilder(0).writeBinary(new Binary(keyName));
          builder.getColumnBuilder(1).writeBinary(new Binary(measurementSchema.getType().name()));
          builder
              .getColumnBuilder(2)
              .writeBinary(new Binary(measurementSchema.getEncodingType().name()));
          builder
              .getColumnBuilder(3)
              .writeBinary(new Binary(measurementSchema.getCompressor().name()));
          builder.declarePosition();
        }
      }
    } catch (Exception e) {
      e.printStackTrace();
    }
    DatasetHeader datasetHeader = DatasetHeaderFactory.getShowNodesInSchemaTemplateHeader();
    future.set(new ConfigTaskResult(TSStatusCode.SUCCESS_STATUS, builder.build(), datasetHeader));
  }
}