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.file;
  
  import org.apache.calcite.model.ModelHandler;
  import org.apache.calcite.rel.type.RelDataType;
  import org.apache.calcite.rel.type.RelDataTypeImpl;
  import org.apache.calcite.rel.type.RelProtoDataType;
  import org.apache.calcite.schema.SchemaPlus;
  import org.apache.calcite.schema.TableFactory;
  import org.apache.calcite.util.Source;
  import org.apache.calcite.util.Sources;
  
  import org.checkerframework.checker.nullness.qual.Nullable;
  
  import java.io.File;
  import java.util.Map;
  
  /**
   * Factory that creates a {@link CsvTranslatableTable}.
   *
   * <p>Allows a file-based table to be included in a model.json file, even in a
   * schema that is not based upon {@link FileSchema}.
   */
  @SuppressWarnings("UnusedDeclaration")
  public class CsvTableFactory implements TableFactory<CsvTable> {
    // public constructor, per factory contract
    public CsvTableFactory() {
    }
  
    @Override public CsvTable create(SchemaPlus schema, String name,
        Map<String, Object> operand, @Nullable RelDataType rowType) {
      String fileName = (String) operand.get("file");
      final File base =
          (File) operand.get(ModelHandler.ExtraOperand.BASE_DIRECTORY.camelName);
      final Source source = Sources.file(base, fileName);
      final RelProtoDataType protoRowType =
          rowType != null ? RelDataTypeImpl.proto(rowType) : null;
      return new CsvTranslatableTable(source, protoRowType);
    }
  }
  