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java.lang.Objectorg.springframework.util.comparator.CompoundComparator<T>
public class CompoundComparator<T>
A comparator that chains a sequence of one or more more Comparators.
A compound comparator calls each Comparator in sequence until a single Comparator returns a non-zero result, or the comparators are exhausted and zero is returned.
This facilitates in-memory sorting similar to multi-column sorting in SQL. The order of any single Comparator in the list can also be reversed.
| Constructor Summary | |
|---|---|
CompoundComparator()
Construct a CompoundComparator with initially no Comparators. |
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CompoundComparator(Comparator[] comparators)
Construct a CompoundComparator from the Comparators in the provided array. |
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| Method Summary | |
|---|---|
void |
addComparator(Comparator<T> comparator)
Add a Comparator to the end of the chain. |
void |
addComparator(Comparator<T> comparator,
boolean ascending)
Add a Comparator to the end of the chain using the provided sort order. |
int |
compare(T o1,
T o2)
|
boolean |
equals(Object obj)
|
int |
getComparatorCount()
Returns the number of aggregated comparators. |
int |
hashCode()
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void |
invertOrder()
Invert the sort order of each sort definition contained by this compound comparator. |
void |
invertOrder(int index)
Invert the sort order of the sort definition at the specified index. |
void |
setAscendingOrder(int index)
Change the sort order at the given index to ascending. |
void |
setComparator(int index,
Comparator<T> comparator)
Replace the Comparator at the given index. |
void |
setComparator(int index,
Comparator<T> comparator,
boolean ascending)
Replace the Comparator at the given index using the given sort order. |
void |
setDescendingOrder(int index)
Change the sort order at the given index to descending sort. |
String |
toString()
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| Methods inherited from class java.lang.Object |
|---|
clone, finalize, getClass, notify, notifyAll, wait, wait, wait |
| Constructor Detail |
|---|
public CompoundComparator()
public CompoundComparator(Comparator[] comparators)
All Comparators will default to ascending sort order, unless they are InvertibleComparators.
comparators - the comparators to build into a compound comparatorInvertibleComparator| Method Detail |
|---|
public void addComparator(Comparator<T> comparator)
The Comparator will default to ascending sort order, unless it is a InvertibleComparator.
comparator - the Comparator to add to the end of the chainInvertibleComparator
public void addComparator(Comparator<T> comparator,
boolean ascending)
comparator - the Comparator to add to the end of the chainascending - the sort order: ascending (true) or descending (false)
public void setComparator(int index,
Comparator<T> comparator)
The Comparator will default to ascending sort order, unless it is a InvertibleComparator.
index - the index of the Comparator to replacecomparator - the Comparator to place at the given indexInvertibleComparator
public void setComparator(int index,
Comparator<T> comparator,
boolean ascending)
index - the index of the Comparator to replacecomparator - the Comparator to place at the given indexascending - the sort order: ascending (true) or descending (false)public void invertOrder()
public void invertOrder(int index)
index - the index of the comparator to invertpublic void setAscendingOrder(int index)
index - the index of the comparator to changepublic void setDescendingOrder(int index)
index - the index of the comparator to changepublic int getComparatorCount()
public int compare(T o1,
T o2)
compare in interface Comparator<T>public boolean equals(Object obj)
equals in interface Comparator<T>equals in class Objectpublic int hashCode()
hashCode in class Objectpublic String toString()
toString in class Object
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