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java.lang.Objectnet.sf.jagg.Aggregator
net.sf.jagg.ProductAggregator
public class ProductAggregator
This class allows represents the "product" aggregator over numeric values.
Field Summary |
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Fields inherited from class net.sf.jagg.Aggregator |
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PROP_SELF |
Constructor Summary | |
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ProductAggregator(java.lang.String property)
Constructs an ProductAggregator that operates on the specified
property. |
Method Summary | |
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void |
init()
Initialize the product to one. |
void |
iterate(java.lang.Object value)
Multiply-in the factor given by this value, ignorning nulls. |
void |
merge(Aggregator agg)
Merge the given Aggregator into this one by multiplying the
respective products. |
ProductAggregator |
replicate()
Returns an uninitialized copy of this Aggregator object,
with the same property(ies) to analyze. |
java.lang.Double |
terminate()
Return the product of all values. |
DoubleDouble |
terminateDoubleDouble()
Return the result as a DoubleDouble . |
Methods inherited from class net.sf.jagg.Aggregator |
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equals, getAggregator, getAggregator, getProperty, getValueFromProperty, hashCode, isInUse, setInUse, setProperty, toString |
Methods inherited from class java.lang.Object |
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clone, finalize, getClass, notify, notifyAll, wait, wait, wait |
Constructor Detail |
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public ProductAggregator(java.lang.String property)
ProductAggregator
that operates on the specified
property.
property
- Multiply all this property's values.Method Detail |
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public ProductAggregator replicate()
Aggregator
object,
with the same property(ies) to analyze.
replicate
in class Aggregator
Aggregator
object.public void init()
init
in class Aggregator
public void iterate(java.lang.Object value)
iterate
in class Aggregator
value
- The value to aggregate.Aggregator.getValueFromProperty(java.lang.Object, java.lang.String)
public void merge(Aggregator agg)
Aggregator
into this one by multiplying the
respective products.
merge
in class Aggregator
agg
- The Aggregator
to merge into this one.public java.lang.Double terminate()
terminate
in class Aggregator
Double
, or 1
if no
values have been processed.public DoubleDouble terminateDoubleDouble()
DoubleDouble
. This is used mainly
when other Aggregators
that use this result must maintain a
high precision.
terminateDoubleDouble
in class Aggregator
DoubleDouble
, or 1
if no values have been accumulated.DoubleDouble
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