com.whitestein.lsps.vaadin.ui.components.table.dataset

Class GroupingDataset.GroupNode

java.lang.Object

com.whitestein.lsps.vaadin.ui.components.table.dataset.GroupingDataset.GroupNode

Enclosing class:

GroupingDataset

public class GroupingDataset.GroupNode
extends Object

Field Summary

Fields

Modifier and Type	Field and Description
LinkedHashMap<Object,GroupingDataset.GroupNode>	groups If this is not null, then leafs is null.
List<Object>	leafs If this is not null, then groups is null.

Method Summary

Modifier and Type	Method and Description
Comparable<?>	getReduction(String columnId) Performs the reduction operation on getTransitiveLeafs().
List<Object>	getTransitiveLeafs() Returns all leafs from all descending group nodes, including this one.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

groups

public final LinkedHashMap<Object,GroupingDataset.GroupNode> groups

If this is not null, then leafs is null. Maps the grouping value to appropriate group node, which may hold leaf values (if this is the last grouping), or may contain further groups.

leafs

public final List<Object> leafs

If this is not null, then groups is null. Contains a list of records belonging to this group.

Method Detail

getTransitiveLeafs

public List<Object> getTransitiveLeafs()

Returns all leafs from all descending group nodes, including this one.

Returns:

a list of leafs, never null, may be empty. Modifications may modify the leafs list.

getReduction

public Comparable<?> getReduction(String columnId)

Performs the reduction operation on getTransitiveLeafs().

Parameters:

columnId - UITableColumn.getColumnId(), not null.

Returns:

the result of the reduction operation, may be null. Computed only once, then cached. A simple value, such as Long, String or Boolean is expected.