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.unnestingfunctions.std;
  
  import org.apache.asterix.formats.nontagged.SerializerDeserializerProvider;
  import org.apache.asterix.om.base.AMutableInt64;
  import org.apache.asterix.om.functions.BuiltinFunctions;
  import org.apache.asterix.om.functions.IFunctionDescriptorFactory;
  import org.apache.asterix.om.types.BuiltinType;
  import org.apache.asterix.om.types.hierachy.ATypeHierarchy;
  import org.apache.asterix.runtime.unnestingfunctions.base.AbstractUnnestingFunctionDynamicDescriptor;
  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.algebricks.runtime.base.IUnnestingEvaluator;
  import org.apache.hyracks.algebricks.runtime.base.IUnnestingEvaluatorFactory;
  import org.apache.hyracks.api.context.IEvaluatorContext;
  import org.apache.hyracks.api.dataflow.value.ISerializerDeserializer;
  import org.apache.hyracks.api.exceptions.HyracksDataException;
  import org.apache.hyracks.data.std.api.IPointable;
  import org.apache.hyracks.data.std.primitive.VoidPointable;
  import org.apache.hyracks.data.std.util.ArrayBackedValueStorage;
  import org.apache.hyracks.dataflow.common.data.accessors.IFrameTupleReference;
  
  public class RangeDescriptor extends AbstractUnnestingFunctionDynamicDescriptor {
  
      private static final long serialVersionUID = 1L;
  
      public static final IFunctionDescriptorFactory FACTORY = RangeDescriptor::new;
  
      @Override
      public FunctionIdentifier getIdentifier() {
          return BuiltinFunctions.RANGE;
      }
  
      @Override
      public IUnnestingEvaluatorFactory createUnnestingEvaluatorFactory(final IScalarEvaluatorFactory[] args) {
          return new IUnnestingEvaluatorFactory() {
  
              private static final long serialVersionUID = 1L;
  
              @Override
              public IUnnestingEvaluator createUnnestingEvaluator(final IEvaluatorContext ctx)
                      throws HyracksDataException {
                  return new IUnnestingEvaluator() {
                      private ArrayBackedValueStorage resultStorage = new ArrayBackedValueStorage();
                      @SuppressWarnings("rawtypes")
                      private ISerializerDeserializer serde =
                              SerializerDeserializerProvider.INSTANCE.getSerializerDeserializer(BuiltinType.AINT64);
                      private IPointable inputVal = new VoidPointable();
                      private IScalarEvaluator eval0 = args[0].createScalarEvaluator(ctx);
                      private IScalarEvaluator eval1 = args[1].createScalarEvaluator(ctx);
                      private AMutableInt64 aInt64 = new AMutableInt64(0);
                      private long current;
                      private long max;
  
                      @Override
                      public void init(IFrameTupleReference tuple) throws HyracksDataException {
                          eval0.evaluate(tuple, inputVal);
                          current = ATypeHierarchy.getLongValue(getIdentifier().getName(), 0, inputVal.getByteArray(),
                                  inputVal.getStartOffset());
                          eval1.evaluate(tuple, inputVal);
                          max = ATypeHierarchy.getLongValue(getIdentifier().getName(), 1, inputVal.getByteArray(),
                                  inputVal.getStartOffset());
                      }
  
                      @SuppressWarnings("unchecked")
                      @Override
                      public boolean step(IPointable result) throws HyracksDataException {
                          if (current > max) {
                              return false;
                          }
                          aInt64.setValue(current);
                          resultStorage.reset();
                          serde.serialize(aInt64, resultStorage.getDataOutput());
                          result.set(resultStorage);
                          current++;
                          return true;
                      }
  
                  };
              }
          };
      }
  
  }
  