org.zkoss.zul
Class FieldComparator

java.lang.Object
  extended by org.zkoss.zul.FieldComparator
All Implemented Interfaces:
java.io.Serializable, java.util.Comparator

public class FieldComparator
extends java.lang.Object
implements java.util.Comparator, java.io.Serializable

Based on the the given field names to compare the field value of the object that is passed in compare(java.lang.Object, java.lang.Object) method.

The field names accept compound "a.b.c" expression. It also accept multiple field names that you can give expression in the form of e.g. "name, age, salary" and this comparator will compare in that sequence.

Since:
3.6.0
Author:
henrichen
See Also:
Serialized Form

Constructor Summary
FieldComparator(java.lang.String orderBy, boolean ascending)
          Compares with the fields per the given "ORDER BY" clause.
FieldComparator(java.lang.String orderBy, boolean ascending, boolean nullAsMax)
          Compares with the fields per the given "ORDER BY" clause.
 
Method Summary
 int compare(java.lang.Object o1, java.lang.Object o2)
           
 java.lang.String getOrderBy()
           
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 
Methods inherited from interface java.util.Comparator
equals
 

Constructor Detail

FieldComparator

public FieldComparator(java.lang.String orderBy,
                       boolean ascending)
Compares with the fields per the given "ORDER BY" clause.

Note: It assumes null as minimum value. If not, use FieldComparator(String, boolean, boolean) instead.

Parameters:
orderBy - the "ORDER BY" clause to be compared upon for the given object in compare(java.lang.Object, java.lang.Object).
ascending - whether to sort as ascending (or descending).

FieldComparator

public FieldComparator(java.lang.String orderBy,
                       boolean ascending,
                       boolean nullAsMax)
Compares with the fields per the given "ORDER BY" clause.

Parameters:
orderBy - the "ORDER BY" clause to be compared upon for the given object in compare(java.lang.Object, java.lang.Object).
ascending - whether to sort as ascending (or descending).
nullAsMax - whether to consider null as the maximum value. If false, null is considered as the minimum value.
Method Detail

compare

public int compare(java.lang.Object o1,
                   java.lang.Object o2)
Specified by:
compare in interface java.util.Comparator

getOrderBy

public java.lang.String getOrderBy()


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