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.core.metadata.schema;
  
  import java.io.IOException;
  
  import org.apache.carbondata.core.datastore.impl.FileFactory;
  import org.apache.carbondata.core.metadata.AbsoluteTableIdentifier;
  import org.apache.carbondata.core.metadata.CarbonMetadata;
  import org.apache.carbondata.core.metadata.CarbonTableIdentifier;
  import org.apache.carbondata.core.metadata.converter.SchemaConverter;
  import org.apache.carbondata.core.metadata.converter.ThriftWrapperSchemaConverterImpl;
  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;
  
  import org.apache.hadoop.conf.Configuration;
  
  /**
   * TODO: It should be removed after store manager implementation.
   */
  public class SchemaReader {
  
    public static CarbonTable readCarbonTableFromStore(AbsoluteTableIdentifier identifier)
        throws IOException {
      String schemaFilePath = CarbonTablePath.getSchemaFilePath(identifier.getTablePath());
      if (FileFactory.isFileExist(schemaFilePath)) {
        String tableName = identifier.getCarbonTableIdentifier().getTableName();
  
        org.apache.carbondata.format.TableInfo tableInfo =
            CarbonUtil.readSchemaFile(CarbonTablePath.getSchemaFilePath(identifier.getTablePath()));
        SchemaConverter schemaConverter = new ThriftWrapperSchemaConverterImpl();
        TableInfo wrapperTableInfo = schemaConverter.fromExternalToWrapperTableInfo(
            tableInfo,
            identifier.getCarbonTableIdentifier().getDatabaseName(),
            tableName,
            identifier.getTablePath());
        CarbonMetadata.getInstance().loadTableMetadata(wrapperTableInfo);
        return CarbonMetadata.getInstance().getCarbonTable(
            identifier.getCarbonTableIdentifier().getTableUniqueName());
      } else {
        throw new IOException("File does not exist: " + schemaFilePath);
      }
    }
  
    /**
     * Read specified schema file as CarbonTable
     * @param schemaFilePath schema file path
     * @param conf hadoop configuration
     * @return CarbonTable object
     * @throws IOException if IO error occurs
     */
    public static CarbonTable readCarbonTableFromSchema(String schemaFilePath, Configuration conf)
        throws IOException {
      TableInfo tableInfo = readTableInfoFromSchema(schemaFilePath, conf);
      return CarbonTable.buildFromTableInfo(tableInfo);
    }
  
    /**
     * Read specified schema file as TableInfo
     * @param schemaFilePath schema file path
     * @param conf hadoop configuration
     * @return TableInfo object
     * @throws IOException if IO error occurs
     */
    private static TableInfo readTableInfoFromSchema(String schemaFilePath, Configuration conf)
        throws IOException {
      if (FileFactory.isFileExist(schemaFilePath)) {
        String tableName = "dummy";
  
        org.apache.carbondata.format.TableInfo tableInfo = CarbonUtil.readSchemaFile(schemaFilePath);
        SchemaConverter schemaConverter = new ThriftWrapperSchemaConverterImpl();
        return schemaConverter.fromExternalToWrapperTableInfo(
            tableInfo,
            "dummy",
            tableName,
            "dummy");
      } else {
        throw new IOException("File does not exist: " + schemaFilePath);
      }
    }
  
    /**
     * the method returns the Wrapper TableInfo
     *
     * @param identifier
     * @return
     */
    public static TableInfo getTableInfo(AbsoluteTableIdentifier identifier)
        throws IOException {
      org.apache.carbondata.format.TableInfo thriftTableInfo =
          CarbonUtil.readSchemaFile(CarbonTablePath.getSchemaFilePath(identifier.getTablePath()));
      ThriftWrapperSchemaConverterImpl thriftWrapperSchemaConverter =
          new ThriftWrapperSchemaConverterImpl();
      CarbonTableIdentifier carbonTableIdentifier =
          identifier.getCarbonTableIdentifier();
      return thriftWrapperSchemaConverter.fromExternalToWrapperTableInfo(
          thriftTableInfo,
          carbonTableIdentifier.getDatabaseName(),
          carbonTableIdentifier.getTableName(),
          identifier.getTablePath());
    }
  
    public static TableInfo inferSchema(AbsoluteTableIdentifier identifier,
        boolean isCarbonFileProvider, Configuration configuration) throws IOException {
  
      org.apache.carbondata.format.TableInfo tableInfo = CarbonUtil
          .inferSchema(identifier.getTablePath(), identifier.getTableName(), isCarbonFileProvider,
              configuration);
      SchemaConverter schemaConverter = new ThriftWrapperSchemaConverterImpl();
      TableInfo wrapperTableInfo = schemaConverter.fromExternalToWrapperTableInfo(
          tableInfo, identifier.getDatabaseName(), identifier.getTableName(),
          identifier.getTablePath());
      wrapperTableInfo.setTransactionalTable(false);
      return wrapperTableInfo;
    }
  
    public static TableInfo inferSchema(AbsoluteTableIdentifier identifier,
        boolean isCarbonFileProvider) throws IOException {
  
      org.apache.carbondata.format.TableInfo tableInfo = CarbonUtil
          .inferSchema(identifier.getTablePath(), identifier.getTableName(), isCarbonFileProvider,
              FileFactory.getConfiguration());
      SchemaConverter schemaConverter = new ThriftWrapperSchemaConverterImpl();
      TableInfo wrapperTableInfo = schemaConverter.fromExternalToWrapperTableInfo(
          tableInfo, identifier.getDatabaseName(), identifier.getTableName(),
          identifier.getTablePath());
      wrapperTableInfo.setTransactionalTable(false);
      return wrapperTableInfo;
    }
  }
  