| /* |
| * 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.</p> |
| */ |
| 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; |
| } |
| } |