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com.tangosol.util.filter
Class ValueChangeEventFilter

java.lang.Object
com.tangosol.util.Base
com.tangosol.util.BitHelper
com.tangosol.util.ExternalizableHelper
com.tangosol.util.filter.AbstractQueryRecorderFilter
com.tangosol.util.filter.ExtractorFilter
com.tangosol.util.filter.ValueChangeEventFilter

All Implemented Interfaces:

ExternalizableLite, PortableObject, Filter, EntryFilter, IndexAwareFilter, QueryRecorderFilter, java.io.Serializable

public class ValueChangeEventFilter

extends ExtractorFilter

implements Filter

Filter which evaluates the content of a MapEvent values based on the specified value extractor. This filter evaluates to true only for update events that change the value of an extracted attribute.

Example: a filter that evaluates to true if there is an update to an Employee object that changes a value of the LastName property.

   new ValueChangeEventFilter("LastName");
 

Since:

Coherence 2.3

Author:

gg 2003.09.30

See Also:

MapEventFilter

Field Summary

Fields inherited from class com.tangosol.util.filter.ExtractorFilter

EVAL_COST, m_extractor

Constructor Summary

ValueChangeEventFilter()
Default constructor (necessary for the ExternalizableLite interface).

ValueChangeEventFilter(java.lang.String sMethod)
Construct a ValueChangeEventFilter that evaluates MapEvent values based on the specified method name.

ValueChangeEventFilter(ValueExtractor extractor)
Construct a ValueChangeEventFilter that evaluates MapEvent values based on the specified extractor.

Method Summary

boolean	equals(java.lang.Object o) Compare the ValueChangeEventFilter with another object to determine equality.
boolean	evaluate(java.lang.Object o) Apply the test to the object.
protected boolean	evaluateExtracted(java.lang.Object oExtracted) Evaluate the specified extracted value.
int	hashCode() Determine a hash value for the ValueChangeEventFilter object according to the general Object.hashCode() contract.
java.lang.String	toString() Return a human-readable description for this Filter.

Methods inherited from class com.tangosol.util.filter.ExtractorFilter

applyIndex, calculateEffectiveness, calculateIteratorEffectiveness, evaluateEntry, extract, getValueExtractor, readExternal, readExternal, writeExternal, writeExternal

Methods inherited from class com.tangosol.util.filter.AbstractQueryRecorderFilter

explain, explain, explain, trace, trace, trace, trace, trace

Methods inherited from class com.tangosol.util.BitHelper

countBits, countBits, countBits, indexOfLSB, indexOfLSB, indexOfLSB, indexOfMSB, indexOfMSB, indexOfMSB, rotateLeft, rotateLeft, rotateLeft, rotateRight, rotateRight, rotateRight, toBitString, toBitString, toBitString

Constructor Detail

ValueChangeEventFilter

public ValueChangeEventFilter()

Default constructor (necessary for the ExternalizableLite interface).

ValueChangeEventFilter

public ValueChangeEventFilter(ValueExtractor extractor)

Construct a ValueChangeEventFilter that evaluates MapEvent values based on the specified extractor.

Parameters:

extractor - ValueExtractor to extract MapEvent values

ValueChangeEventFilter

public ValueChangeEventFilter(java.lang.String sMethod)

Construct a ValueChangeEventFilter that evaluates MapEvent values based on the specified method name.

Parameters:

sMethod - the name of the method to invoke via reflection

Method Detail

evaluate

public boolean evaluate(java.lang.Object o)

Apply the test to the object.

Specified by:

evaluate in interface Filter

Overrides:

evaluate in class ExtractorFilter

Parameters:

o - the object to test

Returns:

true if the test passes, false otherwise

evaluateExtracted

protected boolean evaluateExtracted(java.lang.Object oExtracted)

Evaluate the specified extracted value.

Specified by:

evaluateExtracted in class ExtractorFilter

Parameters:

oExtracted - an extracted value to evaluate

Returns:

true iff the test passes

equals

public boolean equals(java.lang.Object o)

Compare the ValueChangeEventFilter with another object to determine equality.

Returns:

true iff this ValueChangeEventFilter and the passed object are equivalent filters

hashCode

public int hashCode()

Determine a hash value for the ValueChangeEventFilter object according to the general Object.hashCode() contract.

Returns:

an integer hash value for this ValueChangeEventFilter object

toString

public java.lang.String toString()

Return a human-readable description for this Filter.

Returns:

a String description of the Filter

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