org.apache.calcite.adapter.file.FileSchemaFactory Maven / Gradle / Ivy
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/*
* 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.schema.Schema;
import org.apache.calcite.schema.SchemaFactory;
import org.apache.calcite.schema.SchemaPlus;
import java.io.File;
import java.util.List;
import java.util.Map;
/**
* Factory that creates a {@link FileSchema}.
*
* Allows a custom schema to be included in a model.json file.
* See File adapter.
*/
@SuppressWarnings("UnusedDeclaration")
public class FileSchemaFactory implements SchemaFactory {
// public constructor, per factory contract
public FileSchemaFactory() {
}
public Schema create(SchemaPlus parentSchema, String name,
Map operand) {
@SuppressWarnings("unchecked") List> tables =
(List) operand.get("tables");
final File baseDirectory =
(File) operand.get(ModelHandler.ExtraOperand.BASE_DIRECTORY.camelName);
File directoryFile = baseDirectory;
final String directory = (String) operand.get("directory");
if (baseDirectory != null && directory != null) {
directoryFile = new File(directory);
if (!directoryFile.isAbsolute()) {
directoryFile = new File(baseDirectory, directory);
}
}
return new FileSchema(parentSchema, name, directoryFile, tables);
}
}
// End FileSchemaFactory.java