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

Class GroupingDataset.Group

java.lang.Object

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

All Implemented Interfaces:

Serializable

Direct Known Subclasses:

GroupingDataset.LineResolvingGroup, GroupingDataset.OptClosureGroup

Enclosing class:

GroupingDataset

public abstract static class GroupingDataset.Group
extends Object
implements Serializable

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
Group()

Method Summary

Modifier and Type	Method and Description
abstract LinkedHashMap<Object,List<Object>>	group(List<Object> records) Groups given list of records by some value, e.g.

Methods inherited from class java.lang.Object

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

Constructor Detail

Group

public Group()

Method Detail

group

public abstract LinkedHashMap<Object,List<Object>> group(List<Object> records)

Groups given list of records by some value, e.g. by a record property value. All input records must be present in the output map - no records may be filtered out and no syntetic records may be created.

Parameters:

records - a list of records, never null, may be empty.

Returns:

a map, mapping the grouped value to a list of records. The records should appear in the same order as they were present in the records list. Also, the map keys should be ordered the same way. Must never return null, may return an empty map. May contain null key, therefore ImmutableSortedMap cannot be used.