org.kuali.rice.krad.uif.util

Class MultiColumnComparator

java.lang.Object

org.kuali.rice.krad.uif.util.MultiColumnComparator

All Implemented Interfaces:

Comparator<Integer>

public class MultiColumnComparator
extends Object
implements Comparator<Integer>

Comparator used for server side sorting of CollectionGroup data.

This may include DataFields, as well as Fields that don't map directly to elements in the model collection, such as LinkFields that may contain expressions.

NOTE: This class is not thread safe, and each instance is intended to be used only once.

Author:

Kuali Rice Team (rice.collab@kuali.org)

Constructor Summary

Constructors

Constructor and Description
MultiColumnComparator(List<Object> modelCollection, CollectionGroup collectionGroup, List<ColumnSort> columnSorts, ViewModel form, View view) Constructs a MultiColumnComparator instance

Method Summary

Modifier and Type	Method and Description
protected List<Field>	buildPrototypeRow() Build a List of prototype Fields representing a row of the table.
int	compare(Integer index1, Integer index2) Compares the modelCollecton element at index1 to the element at index2 based on the provided ColumnSorts.

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

comparing, comparing, comparingDouble, comparingInt, comparingLong, equals, naturalOrder, nullsFirst, nullsLast, reversed, reverseOrder, thenComparing, thenComparing, thenComparing, thenComparingDouble, thenComparingInt, thenComparingLong

Constructor Detail

MultiColumnComparator

public MultiColumnComparator(List<Object> modelCollection,
                             CollectionGroup collectionGroup,
                             List<ColumnSort> columnSorts,
                             ViewModel form,
                             View view)

Constructs a MultiColumnComparator instance

Parameters:

modelCollection - the model collection that the CollectionGroup is associated with

collectionGroup - the CollectionGroup whose columns are being sorted

columnSorts - A list from highest to lowest precedence of the column sorts to apply

form - object containing the view's data

view - The view

Method Detail

compare

public int compare(Integer index1,
                   Integer index2)

Compares the modelCollecton element at index1 to the element at index2 based on the provided ColumnSorts.

Specified by:

compare in interface Comparator<Integer>

Parameters:

index1 - the index of the first modelCollection element used for comparison

index2 - the index of the second modelCollection element used for comparison

Returns:

0 if the two elements are considered equal, a positive integer if the element at index1 is considered greater, else a negative integer

buildPrototypeRow

protected List<Field> buildPrototypeRow()

Build a List of prototype Fields representing a row of the table.

Any DataFields will have their binding paths shortened to access the model collection elements directly, instead of via the data object

Returns:

a List of prototype Fields representing a row in the table