com.espertech.esper.filter

Class FilterParamIndexCompareString

java.lang.Object

com.espertech.esper.filter.FilterParamIndexBase

com.espertech.esper.filter.FilterParamIndexLookupableBase

com.espertech.esper.filter.FilterParamIndexCompareString

All Implemented Interfaces:

EventEvaluator

public final class FilterParamIndexCompareString
extends FilterParamIndexLookupableBase

Index for filter parameter constants for the comparison operators (less, greater, etc). The implementation is based on the SortedMap implementation of TreeMap. The index only accepts String constants. It keeps a lower and upper bounds of all constants in the index for fast range checking, since the assumption is that frequently values fall within a range.

Field Summary

Fields inherited from class com.espertech.esper.filter.FilterParamIndexLookupableBase

lookupable

Constructor Summary

Constructors

Constructor and Description
FilterParamIndexCompareString(FilterSpecLookupable lookupable, ReadWriteLock readWriteLock, FilterOperator filterOperator)

Method Summary

Modifier and Type	Method and Description
EventEvaluator	get(Object filterConstant) Get the event evaluation instance associated with the constant.
ReadWriteLock	getReadWriteLock() Supplies the lock for protected access.
boolean	isEmpty() Return empty indicator.
void	matchEvent(EventBean theEvent, Collection<FilterHandle> matches) Perform the matching of an event based on the event property values, adding any callbacks for matches found to the matches list.
void	put(Object filterConstant, EventEvaluator matcher) Store the event evaluation instance for the given constant.
void	remove(Object filterConstant) Remove the event evaluation instance for the given constant.
int	sizeExpensive() Return the number of distinct filter parameter constants stored.

Methods inherited from class com.espertech.esper.filter.FilterParamIndexLookupableBase

getLookupable, toString

Methods inherited from class com.espertech.esper.filter.FilterParamIndexBase

getFilterOperator

Methods inherited from class java.lang.Object

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

Constructor Detail

FilterParamIndexCompareString

public FilterParamIndexCompareString(FilterSpecLookupable lookupable,
                                     ReadWriteLock readWriteLock,
                                     FilterOperator filterOperator)

Method Detail

get

public final EventEvaluator get(Object filterConstant)

Description copied from class: FilterParamIndexLookupableBase

Get the event evaluation instance associated with the constant. Returns null if no entry found for the constant. The calling class must make sure that access to the underlying resource is protected for multi-threaded access, the getReadWriteLock() method must supply a lock for this purpose.

Specified by:

get in class FilterParamIndexLookupableBase

Parameters:

filterConstant - is the constant supplied in the event filter parameter

Returns:

event evaluator stored for the filter constant, or null if not found

put

public final void put(Object filterConstant,
                      EventEvaluator matcher)

Description copied from class: FilterParamIndexLookupableBase

Store the event evaluation instance for the given constant. Can override an existing value for the same constant. The calling class must make sure that access to the underlying resource is protected for multi-threaded access, the getReadWriteLock() method must supply a lock for this purpose.

Specified by:

put in class FilterParamIndexLookupableBase

Parameters:

filterConstant - is the constant supplied in the filter parameter

matcher - to be stored for the constant

remove

public final void remove(Object filterConstant)

Description copied from class: FilterParamIndexLookupableBase

Remove the event evaluation instance for the given constant. Returns true if the constant was found, or false if not. The calling class must make sure that access to the underlying resource is protected for multi-threaded writes, the getReadWriteLock() method must supply a lock for this purpose.

Specified by:

remove in class FilterParamIndexLookupableBase

Parameters:

filterConstant - is the value supplied in the filter paremeter

sizeExpensive

public final int sizeExpensive()

Description copied from class: FilterParamIndexLookupableBase

Return the number of distinct filter parameter constants stored. The calling class must make sure that access to the underlying resource is protected for multi-threaded writes, the getReadWriteLock() method must supply a lock for this purpose.

Specified by:

sizeExpensive in class FilterParamIndexLookupableBase

Returns:

Number of entries in index

isEmpty

public boolean isEmpty()

Description copied from class: FilterParamIndexBase

Return empty indicator. The calling class must make sure that access to the underlying resource is protected for multi-threaded writes, the getReadWriteLock() method must supply a lock for this purpose.

Specified by:

isEmpty in class FilterParamIndexBase

Returns:

empty flag

getReadWriteLock

public final ReadWriteLock getReadWriteLock()

Description copied from class: FilterParamIndexLookupableBase

Supplies the lock for protected access.

Specified by:

getReadWriteLock in class FilterParamIndexLookupableBase

Returns:

lock

matchEvent

public final void matchEvent(EventBean theEvent,
                             Collection<FilterHandle> matches)

Description copied from interface: EventEvaluator

Perform the matching of an event based on the event property values, adding any callbacks for matches found to the matches list.

Parameters:

theEvent - is the event object wrapper to obtain event property values from

matches - accumulates the matching filter callbacks