com.tangosol.util.comparator
Class InverseComparator

java.lang.Object
  com.tangosol.util.Base
      com.tangosol.util.comparator.SafeComparator
          com.tangosol.util.comparator.InverseComparator

All Implemented Interfaces:

ExternalizableLite, PortableObject, EntryAwareComparator, QueryMapComparator, Serializable, Comparator

public class InverseComparator
extends SafeComparator
implements QueryMapComparator

Comparator that reverses the result of another comparator.

Author:

cp/gg 2002.11.01

Field Summary

Fields inherited from class com.tangosol.util.comparator.SafeComparator

INSTANCE, m_comparator

Constructor Summary

InverseComparator()
Default constructor (for ExternalizableLite and PortableObject).

InverseComparator(Comparator comparator)
Construct an InverseComparator.

Method Summary

int	compare(Object o1, Object o2) Use the wrapped Comparator to compare the two arguments for order and negate the result.
int	compareEntries(QueryMap.Entry entry1, QueryMap.Entry entry2) Compare two entries using the underlying comparator and negate the result.
boolean	equals(Object o) Compare the InverseComparator with another object to determine equality.

Methods inherited from class com.tangosol.util.comparator.SafeComparator

compareSafe, getComparator, hashCode, isKeyComparator, isKeyComparator, readExternal, readExternal, toString, writeExternal, writeExternal

Constructor Detail

InverseComparator

public InverseComparator()

Default constructor (for ExternalizableLite and PortableObject).

InverseComparator

public InverseComparator(Comparator comparator)

Construct an InverseComparator.

Parameters:

comparator - the comparator whose results are inverted by this Comparator

Method Detail

compare

public int compare(Object o1,
                   Object o2)

Use the wrapped Comparator to compare the two arguments for order and negate the result.

Specified by:

compare in interface Comparator

Overrides:

compare in class SafeComparator

Parameters:

o1 - the first object to be compared

o2 - the second object to be compared

Returns:

a positive integer, zero, or a negative integer as the first argument is less than, equal to, or greater than the second

compareEntries

public int compareEntries(QueryMap.Entry entry1,
                          QueryMap.Entry entry2)

Compare two entries using the underlying comparator and negate the result.

Specified by:

compareEntries in interface QueryMapComparator

Overrides:

compareEntries in class SafeComparator

Parameters:

entry1 - the first entry to compare values from; read-only

entry2 - the second entry to compare values from; read-only

Returns:

a negative integer, zero, or a positive integer as the first entry denotes a value that is is less than, equal to, or greater than the value denoted by the second entry

equals

public boolean equals(Object o)

Compare the InverseComparator with another object to determine equality.

Specified by:

equals in interface Comparator

Overrides:

equals in class SafeComparator

Parameters:

o - the other comparator

Returns:

true iff this InverseComparator and the passed object are equivalent InverseComparator