org.apache.calcite.adapter.druid.DruidSchemaFactory Maven / Gradle / Ivy
/*
* 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.druid;
import org.apache.calcite.schema.Schema;
import org.apache.calcite.schema.SchemaFactory;
import org.apache.calcite.schema.SchemaPlus;
import java.util.List;
import java.util.Map;
/**
* Schema factory that creates Druid schemas.
*
*
* Druid schema operands
*
* Operand
* Description
* Required
*
*
* url
* URL of Druid's query node.
* The default is "http://localhost:8082".
* No
*
*
* coordinatorUrl
* URL of Druid's coordinator node.
* The default is url, replacing "8082" with "8081",
* for example "http://localhost:8081".
* No
*
*
*/
public class DruidSchemaFactory implements SchemaFactory {
/** Default Druid URL. */
public static final String DEFAULT_URL = "http://localhost:8082";
public Schema create(SchemaPlus parentSchema, String name,
Map operand) {
final String url = operand.get("url") instanceof String
? (String) operand.get("url")
: DEFAULT_URL;
final String coordinatorUrl = operand.get("coordinatorUrl") instanceof String
? (String) operand.get("coordinatorUrl")
: url.replace(":8082", ":8081");
// "tables" is a hidden attribute, copied in from the enclosing custom
// schema
final boolean containsTables = operand.get("tables") instanceof List
&& ((List) operand.get("tables")).size() > 0;
return new DruidSchema(url, coordinatorUrl, !containsTables);
}
}
// End DruidSchemaFactory.java