com.espertech.esper.filter

Class IndexTreeBuilder

java.lang.Object

com.espertech.esper.filter.IndexTreeBuilder

public final class IndexTreeBuilder
extends Object

Builder manipulates a tree structure consisting of FilterHandleSetNode and FilterParamIndexBase instances. Filters can be added to a top node (an instance of FilterHandleSetNode) via the add method. This method returns an instance of EventTypeIndexBuilderIndexLookupablePair which represents an element in the tree path (list of indizes) that the filter callback was added to. To remove filters the same IndexTreePath instance must be passed in.

The implementation is designed to be multithread-safe in conjunction with the node classes manipulated by this class.

Method Summary

Modifier and Type	Method and Description
static ArrayDeque<EventTypeIndexBuilderIndexLookupablePair>[]	add(FilterValueSet filterValueSet, FilterHandle filterCallback, FilterHandleSetNode topNode, FilterServiceGranularLockFactory lockFactory) Add a filter callback according to the filter specification to the top node returning information to be used to remove the filter callback.
static void	remove(EventType eventType, FilterHandle filterCallback, EventTypeIndexBuilderIndexLookupablePair[] treePathInfo, FilterHandleSetNode topNode) Remove an filterCallback from the given top node.

Methods inherited from class java.lang.Object

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

Method Detail

add

public static ArrayDeque<EventTypeIndexBuilderIndexLookupablePair>[] add(FilterValueSet filterValueSet,
                                                                         FilterHandle filterCallback,
                                                                         FilterHandleSetNode topNode,
                                                                         FilterServiceGranularLockFactory lockFactory)

Add a filter callback according to the filter specification to the top node returning information to be used to remove the filter callback.

Parameters:

filterValueSet - is the filter definition

filterCallback - is the callback to be added

topNode - node to be added to any subnode beneath it

lockFactory - lock factory

Returns:

an encapsulation of information need to allow for safe removal of the filter tree.

remove

public static void remove(EventType eventType,
                          FilterHandle filterCallback,
                          EventTypeIndexBuilderIndexLookupablePair[] treePathInfo,
                          FilterHandleSetNode topNode)

Remove an filterCallback from the given top node. The IndexTreePath instance passed in must be the same as obtained when the same filterCallback was added.

Parameters:

filterCallback - filter callback to be removed

treePathInfo - encapsulates information need to allow for safe removal of the filterCallback

topNode - The top tree node beneath which the filterCallback was added

eventType - event type