content: /*
   * 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.carbondata.store;
  
  import java.io.IOException;
  import java.util.HashMap;
  import java.util.Map;
  
  import org.apache.carbondata.common.annotations.InterfaceAudience;
  import org.apache.carbondata.core.datastore.impl.FileFactory;
  import org.apache.carbondata.core.metadata.AbsoluteTableIdentifier;
  import org.apache.carbondata.core.metadata.converter.SchemaConverter;
  import org.apache.carbondata.core.metadata.converter.ThriftWrapperSchemaConverterImpl;
  import org.apache.carbondata.core.metadata.schema.SchemaReader;
  import org.apache.carbondata.core.metadata.schema.table.CarbonTable;
  import org.apache.carbondata.core.metadata.schema.table.TableInfo;
  import org.apache.carbondata.core.util.CarbonUtil;
  import org.apache.carbondata.core.util.path.CarbonTablePath;
  
  /**
   * A CarbonStore base class that caches CarbonTable object
   */
  @InterfaceAudience.Internal
  abstract class MetaCachedCarbonStore implements CarbonStore {
  
    // mapping of table path to CarbonTable object
    private Map<String, CarbonTable> cache = new HashMap<>();
  
    CarbonTable getTable(String path) throws IOException {
      if (cache.containsKey(path)) {
        return cache.get(path);
      }
      String schemaPath = CarbonTablePath.getSchemaFilePath(path);
      TableInfo tableInfo;
      if (!FileFactory.isFileExist(schemaPath)) {
        tableInfo = SchemaReader.inferSchema(AbsoluteTableIdentifier.from(path), false);
      } else {
        org.apache.carbondata.format.TableInfo tableInfoFormat;
        tableInfoFormat = CarbonUtil.readSchemaFile(CarbonTablePath.getSchemaFilePath(path));
        SchemaConverter schemaConverter = new ThriftWrapperSchemaConverterImpl();
        tableInfo = schemaConverter.fromExternalToWrapperTableInfo(tableInfoFormat, "", "", "");
        tableInfo.setTablePath(path);
      }
      CarbonTable table = CarbonTable.buildFromTableInfo(tableInfo);
      cache.put(path, table);
      return table;
    }
  
    @Override
    public void close() {
      cache.clear();
    }
  }
  