spark DataSourceOptions 源码
spark DataSourceOptions 代码
文件路径：/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/DataSourceOptions.scala
/*
* 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.spark.sql.catalyst
/**
* Interface defines the following methods for a data source:
* - register a new option name
* - retrieve all registered option names
* - valid a given option name
* - get alternative option name if any
*/
trait DataSourceOptions {
// Option -> Alternative Option if any
private val validOptions = collection.mutable.Map[String, Option[String]]()
/**
* Register a new Option.
*/
protected def newOption(name: String): String = {
validOptions += (name -> None)
name
}
/**
* Register a new Option with an alternative name.
* @param name Option name
* @param alternative Alternative option name
*/
protected def newOption(name: String, alternative: String): Unit = {
// Register both of the options
validOptions += (name -> Some(alternative))
validOptions += (alternative -> Some(name))
}
/**
* @return All data source options and their alternatives if any
*/
def getAllOptions: scala.collection.Set[String] = validOptions.keySet
/**
* @param name Option name to be validated
* @return if the given Option name is valid
*/
def isValidOption(name: String): Boolean = validOptions.contains(name)
/**
* @param name Option name
* @return Alternative option name if any
*/
def getAlternativeOption(name: String): Option[String] = validOptions.get(name).flatten
}
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