/**
 * 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
 * <p/>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p/>
 * 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.drill.exec.expr.fn;

import org.apache.drill.common.exceptions.DrillRuntimeException;
import org.apache.drill.exec.expr.DrillSimpleFunc;
import org.apache.drill.exec.expr.annotations.FunctionTemplate;
import org.apache.drill.exec.expr.annotations.FunctionTemplate.FunctionScope;
import org.apache.drill.exec.expr.annotations.Output;
import org.apache.drill.exec.expr.annotations.Param;
import org.apache.drill.exec.expr.fn.impl.StringFunctionHelpers;
import org.apache.drill.exec.expr.holders.BigIntHolder;
import org.apache.drill.exec.expr.holders.VarCharHolder;

public class ExceptionFunction {

  public static final String EXCEPTION_FUNCTION_NAME = "__throwException";

  @FunctionTemplate(name = EXCEPTION_FUNCTION_NAME, isRandom = true,
          scope = FunctionScope.SIMPLE, nulls = FunctionTemplate.NullHandling.NULL_IF_NULL)
  public static class ThrowException implements DrillSimpleFunc {

    @Param VarCharHolder message;
    @Output BigIntHolder out;

    public void setup() {
    }

    public void eval() {
      String msg = org.apache.drill.exec.expr.fn.impl.StringFunctionHelpers.toStringFromUTF8(message.start, message.end, message.buffer);
      org.apache.drill.exec.expr.fn.ExceptionFunction.throwException(msg);
    }
  }

  public static void throwException(String message) {
    throw new org.apache.drill.common.exceptions.DrillRuntimeException(message);
  }
}