com.espertech.esper.filter
Class FilterParamIndexLookupableBase

java.lang.Object
  com.espertech.esper.filter.FilterParamIndexBase
      com.espertech.esper.filter.FilterParamIndexLookupableBase

All Implemented Interfaces:

EventEvaluator

Direct Known Subclasses:

FilterParamIndexCompare, FilterParamIndexCompareString, FilterParamIndexDoubleRangeBase, FilterParamIndexEqualsBase, FilterParamIndexIn, FilterParamIndexNotEqualsBase, FilterParamIndexNotIn, FilterParamIndexStringRangeBase

public abstract class FilterParamIndexLookupableBase
extends FilterParamIndexBase

Each implementation of this abstract class represents an index of filter parameter constants supplied in filter parameters in filter specifications that feature the same event property and operator.

For example, a filter with a parameter of "count EQUALS 10" would be represented as index for a property named "count" and for a filter operator typed "EQUALS". The index would store a value of "10" in its internal structure.

Implementations make sure that the type of the Object constant in get and put calls matches the event property type.

Field Summary

protected FilterSpecLookupable

lookupable

Constructor Summary

FilterParamIndexLookupableBase(FilterOperator filterOperator, FilterSpecLookupable lookupable)
Constructor.

Method Summary

protected abstract EventEvaluator	get(java.lang.Object filterConstant) Get the event evaluation instance associated with the constant.
FilterSpecLookupable	getLookupable()
protected abstract java.util.concurrent.locks.ReadWriteLock	getReadWriteLock() Supplies the lock for protected access.
protected abstract void	put(java.lang.Object filterConstant, EventEvaluator evaluator) Store the event evaluation instance for the given constant.
protected abstract boolean	remove(java.lang.Object filterConstant) Remove the event evaluation instance for the given constant.
protected abstract int	size() Return the number of distinct filter parameter constants stored.
java.lang.String	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

Methods inherited from interface com.espertech.esper.filter.EventEvaluator

matchEvent

Field Detail

lookupable

protected final FilterSpecLookupable lookupable

Constructor Detail

FilterParamIndexLookupableBase

public FilterParamIndexLookupableBase(FilterOperator filterOperator,
                                      FilterSpecLookupable lookupable)

Constructor.

Parameters:

filterOperator - is the type of comparison performed.

lookupable - is the lookupable

Method Detail

get

protected abstract EventEvaluator get(java.lang.Object filterConstant)

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 FilterParamIndexBase

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

protected abstract void put(java.lang.Object filterConstant,
                            EventEvaluator evaluator)

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 FilterParamIndexBase

Parameters:

filterConstant - is the constant supplied in the filter parameter

evaluator - to be stored for the constant

remove

protected abstract boolean remove(java.lang.Object filterConstant)

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 FilterParamIndexBase

Parameters:

filterConstant - is the value supplied in the filter paremeter

Returns:

true if found and removed, false if not found

size

protected abstract int size()

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:

size in class FilterParamIndexBase

Returns:

Number of entries in index

getReadWriteLock

protected abstract java.util.concurrent.locks.ReadWriteLock getReadWriteLock()

Supplies the lock for protected access.

Specified by:

getReadWriteLock in class FilterParamIndexBase

Returns:

lock

toString

public final java.lang.String toString()

Overrides:

toString in class FilterParamIndexBase

getLookupable

public FilterSpecLookupable getLookupable()