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java.lang.Objectnet.sf.jagg.PropertiesComparator<T>
public class PropertiesComparator<T>
This class represents a flexible Comparator
that is capable of
comparing two objects based on a dynamic list of properties of the objects
of type T
. This class is used internally by
Aggregation
to sort a List<T>
according to
a specified list of properties.
Constructor Summary | |
---|---|
PropertiesComparator(java.util.List<java.lang.String> properties)
Construct a PropertiesComparator that pays attention to the
given List of properties in the generic type T . |
Method Summary | |
---|---|
int |
compare(T o1,
T o2)
Compares the given objects to determine order. |
boolean |
equals(java.lang.Object obj)
Indicates whether the given PropertiesComparator is equal to
this PropertiesComparator . |
Methods inherited from class java.lang.Object |
---|
clone, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public PropertiesComparator(java.util.List<java.lang.String> properties)
PropertiesComparator
that pays attention to the
given List
of properties in the generic type T
.
All properties must be Comparable
.
properties
- A List<String>
of properties.Method Detail |
---|
public int compare(T o1, T o2) throws java.lang.UnsupportedOperationException
Compares the given objects to determine order. Fulfills the
Comparator
contract by returning a negative integer, 0, or a
positive integer if o1
is less than, equal to, or greater
than o2
.
Nulls properties compare equal to each other, and a null property compares greater than a non-null property.
compare
in interface java.util.Comparator<T>
o1
- The left-hand-side object to compare.o2
- The right-hand-side object to compare.
o1
is less than, equal to, or greater than o2
.
java.lang.UnsupportedOperationException
- If any property specified in the
constructor doesn't correspond to a no-argument "get<Property>"
getter method in T
, or if the property's type is not
Comparable
.public boolean equals(java.lang.Object obj)
PropertiesComparator
is equal to
this PropertiesComparator
. All property names must match in
order.
equals
in interface java.util.Comparator<T>
equals
in class java.lang.Object
obj
- The other PropertiesComparator
.
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