Package weka.core
Class InstanceComparator
java.lang.Object
weka.core.InstanceComparator
- All Implemented Interfaces:
Serializable
,Comparator
,RevisionHandler
A comparator for the Instance class. it can be used with or without the
class label. Missing values are sorted at the beginning.
Can be used as comparator in the sorting and binary search algorithms of
Arrays
and Collections
.
Relational values are compared instance by instance with a nested
InstanceComparator.- Version:
- $Revision: 7988 $
- Author:
- FracPete (fracpete at cs dot waikato dot ac dot nz)
- See Also:
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Constructor Summary
ConstructorsConstructorDescriptioninitializes the comparator and includes the class in the comparisonInstanceComparator
(boolean includeClass) initializes the comparator -
Method Summary
Modifier and TypeMethodDescriptionint
compares the two instances, returns -1 if o1 is smaller than o2, 0 if equal and +1 if greater.boolean
returns TRUE if the class is included in the comparisonReturns the revision string.static void
for testing only.void
setIncludeClass
(boolean includeClass) sets whether the class should be included (= TRUE) in the comparisonMethods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
Methods inherited from interface java.util.Comparator
equals, reversed, thenComparing, thenComparing, thenComparing, thenComparingDouble, thenComparingInt, thenComparingLong
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Constructor Details
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InstanceComparator
public InstanceComparator()initializes the comparator and includes the class in the comparison -
InstanceComparator
public InstanceComparator(boolean includeClass) initializes the comparator
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Method Details
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setIncludeClass
public void setIncludeClass(boolean includeClass) sets whether the class should be included (= TRUE) in the comparison- Parameters:
includeClass
- whether to include the class in the comparison
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getIncludeClass
public boolean getIncludeClass()returns TRUE if the class is included in the comparison -
compare
compares the two instances, returns -1 if o1 is smaller than o2, 0 if equal and +1 if greater. The method assumes that both instance objects have the same attributes, they don't have to belong to the same dataset.- Specified by:
compare
in interfaceComparator
- Parameters:
o1
- the first instance to compareo2
- the second instance to compare- Returns:
- returns -1 if o1 is smaller than o2, 0 if equal and +1 if greater
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getRevision
Returns the revision string.- Specified by:
getRevision
in interfaceRevisionHandler
- Returns:
- the revision
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main
for testing only. takes an ARFF-filename as first argument to perform some tests.- Throws:
Exception
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