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java.lang.Objectnet.sf.jagg.AggregateValuePropertiesComparator<T>
public class AggregateValuePropertiesComparator<T>
This class represents a Comparator
that is capable of comparing
two objects based on a dynamic list of properties of the objects
of type T
. These objects are wrapped in
AggregateValues
. This class is used internally by
Aggregation
objects to sort a
List<AggregateValue<T>>
according to a specified
list of properties.
Constructor Summary | |
---|---|
AggregateValuePropertiesComparator(java.util.List<java.lang.String> properties)
Construct an AggregateValuePropertiesComparator that pays
attention to the given List of properties in an
AggregateValue<T> . |
Method Summary | |
---|---|
int |
compare(AggregateValue<T> av1,
AggregateValue<T> av2)
Compares the given objects to determine order. |
boolean |
equals(java.lang.Object obj)
Indicates whether the given AggregateValuePropertiesComparator is equal to this
AggregateValuePropertiesComparator . |
Methods inherited from class java.lang.Object |
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clone, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public AggregateValuePropertiesComparator(java.util.List<java.lang.String> properties)
AggregateValuePropertiesComparator
that pays
attention to the given List
of properties in an
AggregateValue<T>
. All properties must be
Comparable
.
properties
- A List<String>
of properties.Method Detail |
---|
public int compare(AggregateValue<T> av1, AggregateValue<T> av2) 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
.
Null property values compare equal to each other, and a null property compares greater than a non-null property
.
compare
in interface java.util.Comparator<AggregateValue<T>>
av1
- The left-hand-side object to compare.av2
- 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)
AggregateValuePropertiesComparator
is equal to this
AggregateValuePropertiesComparator
. All property names must
match in order.
equals
in interface java.util.Comparator<AggregateValue<T>>
equals
in class java.lang.Object
obj
- The other AggregateValuePropertiesComparator
.
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