content: /*
   * 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.asterix.runtime.evaluators.functions;
  
  import org.apache.asterix.common.exceptions.ErrorCode;
  import org.apache.asterix.common.exceptions.RuntimeDataException;
  import org.apache.asterix.om.functions.BuiltinFunctions;
  import org.apache.asterix.om.functions.IFunctionDescriptorFactory;
  import org.apache.asterix.om.types.ATypeTag;
  import org.apache.asterix.runtime.evaluators.base.AbstractScalarFunctionDynamicDescriptor;
  import org.apache.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
  import org.apache.hyracks.algebricks.runtime.base.IScalarEvaluator;
  import org.apache.hyracks.algebricks.runtime.base.IScalarEvaluatorFactory;
  import org.apache.hyracks.api.context.IEvaluatorContext;
  import org.apache.hyracks.api.exceptions.HyracksDataException;
  import org.apache.hyracks.data.std.api.IPointable;
  import org.apache.hyracks.data.std.primitive.DoublePointable;
  import org.apache.hyracks.data.std.primitive.FloatPointable;
  import org.apache.hyracks.data.std.primitive.VoidPointable;
  import org.apache.hyracks.dataflow.common.data.accessors.IFrameTupleReference;
  
  /**
   * ifnanorinf(arg1, arg2, ...) scans the list of arguments in order and returns the first numeric argument it
   * encounters.
   * If the argument being inspected is missing or NaN/Infinity as determined by the mathematical definition of
   * floating-points, then it skips the argument and inspects the next one. It returns null if:
   * 1. the argument being inspected is not numeric.
   * 2. all the arguments have been inspected and no candidate value has been found.
   *
   * Number of arguments: Min is 2. Max is {@link Short#MAX_VALUE}
   */
  public class IfNanOrInfDescriptor extends AbstractScalarFunctionDynamicDescriptor {
  
      private static final long serialVersionUID = 1L;
      public static final IFunctionDescriptorFactory FACTORY = IfNanOrInfDescriptor::new;
  
      @Override
      public IScalarEvaluatorFactory createEvaluatorFactory(final IScalarEvaluatorFactory[] args) {
          return new IScalarEvaluatorFactory() {
              private static final long serialVersionUID = 1L;
  
              @Override
              public IScalarEvaluator createScalarEvaluator(final IEvaluatorContext ctx) throws HyracksDataException {
                  return new AbstractIfInfOrNanEval(ctx, args) {
                      @Override
                      protected boolean skipDouble(double d) {
                          return Double.isInfinite(d) || Double.isNaN(d);
                      }
  
                      @Override
                      protected boolean skipFloat(float f) {
                          return Float.isInfinite(f) || Float.isNaN(f);
                      }
  
                      @Override
                      protected FunctionIdentifier getIdentifier() {
                          return IfNanOrInfDescriptor.this.getIdentifier();
                      }
                  };
              }
          };
      }
  
      @Override
      public FunctionIdentifier getIdentifier() {
          return BuiltinFunctions.IF_NAN_OR_INF;
      }
  
      public static abstract class AbstractIfInfOrNanEval implements IScalarEvaluator {
  
          private final IScalarEvaluator[] argEvals;
  
          private final IPointable argPtr;
  
          AbstractIfInfOrNanEval(IEvaluatorContext ctx, IScalarEvaluatorFactory[] args) throws HyracksDataException {
              argEvals = new IScalarEvaluator[args.length];
              for (int i = 0; i < argEvals.length; i++) {
                  argEvals[i] = args[i].createScalarEvaluator(ctx);
              }
              argPtr = new VoidPointable();
          }
  
          @Override
          public void evaluate(IFrameTupleReference tuple, IPointable result) throws HyracksDataException {
              for (int i = 0; i < argEvals.length; i++) {
                  argEvals[i].evaluate(tuple, argPtr);
                  ATypeTag argTypeTag = PointableHelper.getTypeTag(argPtr);
                  if (argTypeTag == null) {
                      throw new RuntimeDataException(ErrorCode.INVALID_FORMAT, getIdentifier(), i);
                  }
                  switch (argTypeTag) {
                      case DOUBLE:
                          double d = DoublePointable.getDouble(argPtr.getByteArray(), argPtr.getStartOffset() + 1);
                          if (skipDouble(d)) {
                              continue;
                          }
                          result.set(argPtr);
                          return;
                      case FLOAT:
                          float f = FloatPointable.getFloat(argPtr.getByteArray(), argPtr.getStartOffset() + 1);
                          if (skipFloat(f)) {
                              continue;
                          }
                          result.set(argPtr);
                          return;
                      case MISSING:
                          continue;
                      case BIGINT:
                      case INTEGER:
                      case SMALLINT:
                      case TINYINT:
                          result.set(argPtr);
                          return;
                      default:
                          PointableHelper.setNull(result);
                          return;
                  }
              }
  
              PointableHelper.setNull(result);
          }
  
          protected abstract FunctionIdentifier getIdentifier();
  
          protected abstract boolean skipDouble(double d);
  
          protected abstract boolean skipFloat(float f);
      }
  }
  