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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 TypeRegistry typeRegistry = new TypeRegistry();
 
     public abstract Block[] getSequenceBlocks(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), getSequenceBlocks(0, 0));
     }
 
     @Test
     public void testSinglePosition()
     {
         testAggregation(getExpectedValue(0, 1), getSequenceBlocks(0, 1));
     }
 
     @Test
     public void testMultiplePositions()
     {
         testAggregation(getExpectedValue(0, 5), getSequenceBlocks(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[] blocks = new Block[parameterTypes.size()];
         for (int i = 0; i < parameterTypes.size(); i++) {
             Block nullValueBlock = parameterTypes.get(0).createBlockBuilder(new BlockBuilderStatus(), 1)
                     .appendNull()
                     .build();
             blocks[i] = new RunLengthEncodedBlock(nullValueBlock, 10);
         }
        testAggregation(getExpectedValueIncludingNulls(0, 0, 10), blocks);
    }
    @Test
    public void testMixedNullAndNonNullPositions()
    {
        // if there are no parameters skip this test
        List<TypeparameterTypes = getFunction().getParameterTypes();
        if (parameterTypes.isEmpty()) {
            return;
        }
        Block[] alternatingNullsBlocks = createAlternatingNullsBlock(parameterTypes.get(0), getSequenceBlocks(0, 10));
        testAggregation(getExpectedValueIncludingNulls(0, 10, 20), alternatingNullsBlocks);
    }
    @Test
    public void testNegativeOnlyValues()
    {
        testAggregation(getExpectedValue(-10, 5), getSequenceBlocks(-10, 5));
    }
    @Test
    public void testPositiveOnlyValues()
    {
        testAggregation(getExpectedValue(2, 4), getSequenceBlocks(2, 4));
    }
    public Block[] createAlternatingNullsBlock(Type typeBlock... sequenceBlocks)
    {
        Block[] alternatingNullsBlocks = new Block[sequenceBlocks.length];
        for (int i = 0; i < sequenceBlocks.lengthi++) {
            int positionCount = sequenceBlocks[i].getPositionCount();
            BlockBuilder blockBuilder = type.createBlockBuilder(new BlockBuilderStatus(), positionCount);
            for (int position = 0; position < positionCountposition++) {
                // append null
                blockBuilder.appendNull();
                // append value
                type.appendTo(sequenceBlocks[i], positionblockBuilder);
            }
            alternatingNullsBlocks[i] = blockBuilder.build();
        }
        return alternatingNullsBlocks;
    }
    protected void testAggregation(Object expectedValueBlock... blocks)
    {
        assertAggregation(getFunction(), getConfidence(), expectedValueblocks[0].getPositionCount(), blocks);
    }
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