/*
 * Copyright (C) 2017-2019 Dremio Corporation
 *
 * Licensed 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 com.dremio.plugins.elastic.planning.functions;

import org.apache.calcite.rex.RexCall;

import com.google.common.base.Preconditions;

public class UnaryFunction extends ElasticFunction {

  public UnaryFunction(String commonName){
    super(commonName, commonName);
  }

  public UnaryFunction(String dremioName, String elasticName){
    super(dremioName, elasticName);
  }

  @Override
  public FunctionRender render(FunctionRenderer renderer, RexCall call) {
    Preconditions.checkArgument(call.getOperands().size() == 1,
        "Unary operation %s should only have one argument, but got %s.", dremioName, call.getOperands().size());

    FunctionRender operand = call.getOperands().get(0).accept(renderer.getVisitor());
    return new FunctionRender(String.format("%s(%s)", elasticName, operand.getScript()), operand.getNulls());
  }

}
