exec/java-exec/src/main/java/org/apache/calcite/jdbc/DynamicSchema.java

/*
 * 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.jdbc;

import org.apache.calcite.schema.Schema;
import org.apache.calcite.schema.SchemaPlus;
import org.apache.drill.common.AutoCloseables;
import org.apache.drill.exec.alias.AliasRegistryProvider;
import org.apache.drill.exec.store.AbstractSchema;
import org.apache.drill.exec.store.SchemaConfig;
import org.apache.drill.exec.store.StoragePluginRegistry;


/**
 * Unlike SimpleCalciteSchema, DynamicSchema could have an empty or partial schemaMap, but it could maintain a map of
 * name->SchemaFactory, and only register schema when the correspondent name is requested.
 */
public class DynamicSchema extends SimpleCalciteSchema implements AutoCloseable {

  public DynamicSchema(CalciteSchema parent, Schema schema, String name) {
    super(parent, schema, name);
  }

  @Override
  protected CalciteSchema getImplicitSubSchema(String schemaName,
                                               boolean caseSensitive) {
    Schema s = schema.getSubSchema(schemaName);
    if (s != null) {
      return new DynamicSchema(this, s, schemaName);
    }
    return getSubSchemaMap().get(schemaName);
  }

  public static SchemaPlus createRootSchema(StoragePluginRegistry storages,
      SchemaConfig schemaConfig, AliasRegistryProvider aliasRegistryProvider) {
    DynamicRootSchema rootSchema = new DynamicRootSchema(storages, schemaConfig, aliasRegistryProvider);
    return rootSchema.plus();
  }

  @Override
  public CalciteSchema add(String name, Schema schema) {
    CalciteSchema calciteSchema =
      new DynamicSchema(this, schema, name);
    subSchemaMap.put(name, calciteSchema);
    return calciteSchema;
  }

  @Override
  protected TableEntry getImplicitTable(String tableName, boolean caseSensitive) {
    return super.getImplicitTable(tableName, true);
  }

  @Override
  public void close() throws Exception {
    for (CalciteSchema cs : subSchemaMap.map().values()) {
      AutoCloseables.closeWithUserException(cs.plus().unwrap(AbstractSchema.class));
    }
  }

}