org.apache.flink.table.codegen.calls.MethodCallGen.scala Maven / Gradle / Ivy

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This module bridges Table/SQL API and runtime. It contains all resources that are required during pre-flight and runtime phase.

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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.flink.table.codegen.calls

import java.lang.reflect.Method

import org.apache.flink.api.common.typeinfo.TypeInformation
import org.apache.flink.table.codegen.CodeGenUtils.qualifyMethod
import org.apache.flink.table.codegen.calls.CallGenerator.generateCallIfArgsNotNull
import org.apache.flink.table.codegen.{CodeGenerator, GeneratedExpression}

/**
  * Generates a function call by using a [[java.lang.reflect.Method]].
  */
class MethodCallGen(returnType: TypeInformation[_], method: Method) extends CallGenerator {

  override def generate(
      codeGenerator: CodeGenerator,
      operands: Seq[GeneratedExpression])
    : GeneratedExpression = {
    generateCallIfArgsNotNull(codeGenerator.nullCheck, returnType, operands) {
      (terms) =>
        s"""
          |${qualifyMethod(method)}(${terms.mkString(", ")})
          |""".stripMargin
    }
  }
}