flink-libraries/flink-table/src/main/scala/org/apache/flink/table/codegen/calls/MultiTypeMethodCallGen.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.flink.table.codegen.calls

import java.lang.reflect.Method

import org.apache.flink.table.codegen.calls.CallGenerator._
import org.apache.flink.table.codegen.{CodeGenerator, GeneratedExpression}

/**
  * Generates a function call that calls a method which returns the same type that it
  * takes as first argument.
  */
class MultiTypeMethodCallGen(method: Method) extends CallGenerator {

  override def generate(
      codeGenerator: CodeGenerator,
      operands: Seq[GeneratedExpression])
    : GeneratedExpression = {
    generateCallIfArgsNotNull(codeGenerator.nullCheck, operands.head.resultType, operands) {
      (operandResultTerms) =>
        s"""
          |${method.getDeclaringClass.getCanonicalName}.
          |  ${method.getName}(${operandResultTerms.mkString(", ")})
         """.stripMargin
    }
  }
}