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.calcite.adapter.csv;
  
  import org.apache.calcite.model.ModelHandler;
  import org.apache.calcite.schema.Schema;
  import org.apache.calcite.schema.SchemaFactory;
  import org.apache.calcite.schema.SchemaPlus;
  
  import java.io.File;
  import java.util.Locale;
  import java.util.Map;
  
  /**
   * Factory that creates a {@link CsvSchema}.
   *
   * <p>Allows a custom schema to be included in a <code><i>model</i>.json</code>
   * file.
   */
  @SuppressWarnings("UnusedDeclaration")
  public class CsvSchemaFactory implements SchemaFactory {
    /** Public singleton, per factory contract. */
    public static final CsvSchemaFactory INSTANCE = new CsvSchemaFactory();
  
    private CsvSchemaFactory() {
    }
  
    @Override public Schema create(SchemaPlus parentSchema, String name,
        Map<String, Object> operand) {
      final String directory = (String) operand.get("directory");
      final File base =
          (File) operand.get(ModelHandler.ExtraOperand.BASE_DIRECTORY.camelName);
      File directoryFile = new File(directory);
      if (base != null && !directoryFile.isAbsolute()) {
        directoryFile = new File(base, directory);
      }
      String flavorName = (String) operand.get("flavor");
      CsvTable.Flavor flavor;
      if (flavorName == null) {
        flavor = CsvTable.Flavor.SCANNABLE;
      } else {
        flavor = CsvTable.Flavor.valueOf(flavorName.toUpperCase(Locale.ROOT));
      }
      return new CsvSchema(directoryFile, flavor);
    }
  }
  