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.pig;
  
  import org.apache.calcite.model.ModelHandler;
  import org.apache.calcite.rel.type.RelDataType;
  import org.apache.calcite.schema.SchemaPlus;
  import org.apache.calcite.schema.TableFactory;
  
  import org.checkerframework.checker.nullness.qual.Nullable;
  
  import java.io.File;
  import java.util.List;
  import java.util.Map;
  
  /**
   * Factory that creates a {@link PigTable}.
   *
   * <p>Allows a Pig table to be included in a model.json file.
   */
  public class PigTableFactory implements TableFactory<PigTable> {
    // public constructor, per factory contract
    public PigTableFactory() {
    }
  
    @SuppressWarnings("unchecked")
    @Override public PigTable create(SchemaPlus schema, String name,
        Map<String, Object> operand, @Nullable RelDataType rowType) {
      String fileName = (String) operand.get("file");
      File file = new File(fileName);
      final File base =
          (File) operand.get(ModelHandler.ExtraOperand.BASE_DIRECTORY.camelName);
      if (base != null && !file.isAbsolute()) {
        file = new File(base, fileName);
      }
      final List<String> fieldNames = (List<String>) operand.get("columns");
      final PigTable result = new PigTable(file.getAbsolutePath(), fieldNames.toArray(new String[0]));
      schema.unwrap(PigSchema.class).registerTable(name, result);
      return result;
    }
  }
  