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java.lang.Object org.springframework.util.comparator.CompoundComparator
public class CompoundComparator
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 | |
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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. |
Method Summary | |
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void |
addComparator(Comparator comparator)
Add a Comparator to the end of the chain. |
void |
addComparator(Comparator comparator,
boolean ascending)
Add a Comparator to the end of the chain using the provided sort order. |
int |
compare(Object o1,
Object o2)
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boolean |
equals(Object obj)
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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 comparator)
Replace the Comparator at the given index. |
void |
setComparator(int index,
Comparator 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 |
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clone, finalize, getClass, notify, notifyAll, wait, wait, wait |
Constructor Detail |
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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 |
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public void addComparator(Comparator 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 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 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 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(Object o1, Object o2)
compare
in interface Comparator
public boolean equals(Object obj)
equals
in interface Comparator
equals
in class Object
public int hashCode()
public String toString()
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