org.apache.flink.table.runtime.collector.TableFunctionCollector.scala 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.flink.table.runtime.collector
import org.apache.flink.table.api.functions.TableFunction
import org.apache.flink.util.Collector
/**
* The basic implementation of collector for [[TableFunction]].
*/
abstract class TableFunctionCollector[T] extends Collector[T] {
private var input: Any = _
private var collector: Collector[_] = _
private var collected: Boolean = _
/**
* Sets the input row from left table,
* which will be used to cross join with the result of table function.
*/
def setInput(input: Any): Unit = {
this.input = input
}
/**
* Gets the input value from left table,
* which will be used to cross join with the result of table function.
*/
def getInput: Any = {
input
}
/**
* Sets the current collector, which used to emit the final row.
*/
def setCollector(collector: Collector[_]): Unit = {
this.collector = collector
}
/**
* Gets the internal collector which used to emit the final row.
*/
def getCollector: Collector[_] = {
this.collector
}
/**
* Resets the flag to indicate whether [[collect(T)]] has been called.
*/
def reset(): Unit = {
collected = false
}
/**
* Whether [[collect(T)]] has been called.
*
* @return True if [[collect(T)]] has been called.
*/
def isCollected: Boolean = collected
override def collect(record: T): Unit = {
collected = true
}
}