Package com.tangosol.util.filter
Class ValueChangeEventFilter<V,E>
- java.lang.Object
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- com.tangosol.util.filter.ValueChangeEventFilter<V,E>
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- All Implemented Interfaces:
ExternalizableLite
,PortableObject
,Filter<MapEvent<?,V>>
,Serializable
public class ValueChangeEventFilter<V,E> extends Object implements Filter<MapEvent<?,V>>, ExternalizableLite, PortableObject
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
, Serialized Form
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Field Summary
Fields Modifier and Type Field Description protected ValueExtractor<? super V,? extends E>
m_extractor
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Constructor Summary
Constructors Constructor Description ValueChangeEventFilter()
Default constructor (necessary for the ExternalizableLite interface).ValueChangeEventFilter(ValueExtractor<? super V,? extends E> extractor)
Construct a ValueChangeEventFilter that evaluates MapEvent values based on the specified extractor.ValueChangeEventFilter(String sMethod)
Construct a ValueChangeEventFilter that evaluates MapEvent values based on the specified method name.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description boolean
equals(Object o)
Compare the ValueChangeEventFilter with another object to determine equality.boolean
evaluate(MapEvent<?,V> event)
Apply the test to the input argument.protected E
extract(V target)
Extract value from a target object.int
hashCode()
Determine a hash value for the ValueChangeEventFilter object according to the generalObject.hashCode()
contract.void
readExternal(PofReader in)
Restore the contents of a user type instance by reading its state using the specified PofReader object.void
readExternal(DataInput in)
Restore the contents of this object by loading the object's state from the passed DataInput object.String
toString()
Return a human-readable description for this Filter.void
writeExternal(PofWriter out)
Save the contents of a POF user type instance by writing its state using the specified PofWriter object.void
writeExternal(DataOutput out)
Save the contents of this object by storing the object's state into the passed DataOutput object.-
Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait
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Methods inherited from interface com.tangosol.util.Filter
and, asLimitFilter, associatedWith, forKeys, forPartitions, or, toExpression, xor
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Field Detail
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m_extractor
protected ValueExtractor<? super V,? extends E> m_extractor
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Constructor Detail
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ValueChangeEventFilter
public ValueChangeEventFilter()
Default constructor (necessary for the ExternalizableLite interface).
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ValueChangeEventFilter
public ValueChangeEventFilter(ValueExtractor<? super V,? extends E> extractor)
Construct a ValueChangeEventFilter that evaluates MapEvent values based on the specified extractor.- Parameters:
extractor
- ValueExtractor to extract MapEvent values
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ValueChangeEventFilter
public ValueChangeEventFilter(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
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Method Detail
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extract
protected E extract(V target)
Extract value from a target object.- Parameters:
target
- the object to extract the value from- Returns:
- the extracted value
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equals
public boolean equals(Object o)
Compare the ValueChangeEventFilter with another object to determine equality.
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hashCode
public int hashCode()
Determine a hash value for the ValueChangeEventFilter object according to the generalObject.hashCode()
contract.
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toString
public String toString()
Return a human-readable description for this Filter.
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readExternal
public void readExternal(DataInput in) throws IOException
Description copied from interface:ExternalizableLite
Restore the contents of this object by loading the object's state from the passed DataInput object.- Specified by:
readExternal
in interfaceExternalizableLite
- Parameters:
in
- the DataInput stream to read data from in order to restore the state of this object- Throws:
IOException
- if an I/O exception occursNotActiveException
- if the object is not in its initial state, and therefore cannot be deserialized into
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writeExternal
public void writeExternal(DataOutput out) throws IOException
Description copied from interface:ExternalizableLite
Save the contents of this object by storing the object's state into the passed DataOutput object.- Specified by:
writeExternal
in interfaceExternalizableLite
- Parameters:
out
- the DataOutput stream to write the state of this object to- Throws:
IOException
- if an I/O exception occurs
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readExternal
public void readExternal(PofReader in) throws IOException
Description copied from interface:PortableObject
Restore the contents of a user type instance by reading its state using the specified PofReader object.- Specified by:
readExternal
in interfacePortableObject
- Parameters:
in
- the PofReader from which to read the object's state- Throws:
IOException
- if an I/O error occurs
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writeExternal
public void writeExternal(PofWriter out) throws IOException
Description copied from interface:PortableObject
Save the contents of a POF user type instance by writing its state using the specified PofWriter object.- Specified by:
writeExternal
in interfacePortableObject
- Parameters:
out
- the PofWriter to which to write the object's state- Throws:
IOException
- if an I/O error occurs
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