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  /*
   * 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.facebook.presto.operator.aggregation;
 
 
 import java.util.List;
 
 import static com.facebook.presto.operator.aggregation.AggregationTestUtils.assertAggregation;
 
 public abstract class AbstractTestAggregationFunction
 {
     protected final FunctionRegistry functionRegistry = new FunctionRegistry(new TypeRegistry(), true);
     public abstract Block getSequenceBlock(int startint length);
 
     protected final InternalAggregationFunction getFunction()
     {
     }
 
     protected abstract String getFunctionName();
 
     protected abstract List<StringgetFunctionParameterTypes();
 
     protected boolean isApproximate()
     {
         return false;
     }
 
     public abstract Object getExpectedValue(int startint length);
 
     public double getConfidence()
     {
         return 1.0;
     }
 
     public Object getExpectedValueIncludingNulls(int startint lengthint lengthIncludingNulls)
     {
         return getExpectedValue(startlength);
     }
 
     @Test
     public void testNoPositions()
     {
         testAggregation(getExpectedValue(0, 0), getSequenceBlock(0, 0));
     }
 
     @Test
     public void testSinglePosition()
     {
         testAggregation(getExpectedValue(0, 1), getSequenceBlock(0, 1));
     }
 
     @Test
     public void testMultiplePositions()
     {
         testAggregation(getExpectedValue(0, 5), getSequenceBlock(0, 5));
     }
 
     @Test
     public void testAllPositionsNull()
             throws Exception
     {
         // if there are no parameters skip this test
         List<TypeparameterTypes = getFunction().getParameterTypes();
         if (parameterTypes.isEmpty()) {
             return;
         }
 
         Block nullValueBlock = parameterTypes.get(0).createBlockBuilder(new BlockBuilderStatus())
                 .appendNull()
                 .build();
 
         Block block = new RunLengthEncodedBlock(nullValueBlock, 10);
         testAggregation(getExpectedValueIncludingNulls(0, 0, 10), block);
     }
 
     @Test
    public void testMixedNullAndNonNullPositions()
    {
        // if there are no parameters skip this test
        List<TypeparameterTypes = getFunction().getParameterTypes();
        if (parameterTypes.isEmpty()) {
            return;
        }
        Block alternatingNullsBlock = createAlternatingNullsBlock(parameterTypes.get(0), getSequenceBlock(0, 10));
        testAggregation(getExpectedValueIncludingNulls(0, 10, 20), alternatingNullsBlock);
    }
    @Test
    public void testNegativeOnlyValues()
    {
        testAggregation(getExpectedValue(-10, 5), getSequenceBlock(-10, 5));
    }
    @Test
    public void testPositiveOnlyValues()
    {
        testAggregation(getExpectedValue(2, 4), getSequenceBlock(2, 4));
    }
    public Block createAlternatingNullsBlock(Type typeBlock sequenceBlock)
    {
        BlockBuilder blockBuilder = type.createBlockBuilder(new BlockBuilderStatus());
        for (int position = 0; position < sequenceBlock.getPositionCount(); position++) {
            // append null
            blockBuilder.appendNull();
            // append value
            type.appendTo(sequenceBlockpositionblockBuilder);
        }
        return blockBuilder.build();
    }
    protected void testAggregation(Object expectedValueBlock block)
    {
        assertAggregation(getFunction(), getConfidence(), expectedValueblock.getPositionCount(), block);
    }
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