@InterfaceAudience.Public @InterfaceStability.Stable public class UniqValueCount extends Object implements ValueAggregator<Object>
Modifier and Type | Field and Description |
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static String |
MAX_NUM_UNIQUE_VALUES |
Constructor and Description |
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UniqValueCount()
the default constructor
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UniqValueCount(long maxNum)
constructor
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Modifier and Type | Method and Description |
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void |
addNextValue(Object val)
add a value to the aggregator
|
ArrayList<Object> |
getCombinerOutput() |
String |
getReport() |
Set<Object> |
getUniqueItems() |
void |
reset()
reset the aggregator
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long |
setMaxItems(long n)
Set the limit on the number of unique values
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public static final String MAX_NUM_UNIQUE_VALUES
public UniqValueCount()
public UniqValueCount(long maxNum)
maxNum
- the limit in the number of unique values to keep.public long setMaxItems(long n)
n
- the desired limit on the number of unique valuespublic void addNextValue(Object val)
addNextValue
in interface ValueAggregator<Object>
val
- an object.public String getReport()
getReport
in interface ValueAggregator<Object>
public Set<Object> getUniqueItems()
public void reset()
reset
in interface ValueAggregator<Object>
public ArrayList<Object> getCombinerOutput()
getCombinerOutput
in interface ValueAggregator<Object>
Copyright © 2018 Apache Software Foundation. All rights reserved.