com.tangosol.util

Class SegmentedHashMap.ContainsValueAction

java.lang.Object

com.tangosol.util.SegmentedHashMap.EntryActionAdapter

com.tangosol.util.SegmentedHashMap.ContainsValueAction

All Implemented Interfaces:

SegmentedHashMap.EntryAction, SegmentedHashMap.IterableEntryAction

Enclosing class:

SegmentedHashMap

protected static class SegmentedHashMap.ContainsValueAction
extends SegmentedHashMap.EntryActionAdapter

Action support for containsValue(). The action performs a lookup by value and is not required to run while holding any segment-locks.

The context object for a ContainsValueAction is an opaque context created by instantiateContext.

The result of invoking a ContainsValueAction is Boolean.TRUE if the value is found in the map or Boolean.FALSE if the value is not found in the map.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	ContainsValueAction()

Method Summary

Modifier and Type	Method and Description
Object	instantiateContext(Object oValue) Instantiate a context appropriate for applying ContainsValueAction to lookup oValue in the map.
Object	invokeFound(Object oKey, Object oContext, SegmentedHashMap.Entry[] aeBucket, int nBucket, SegmentedHashMap.Entry entryPrev, SegmentedHashMap.Entry entryCur) Invoke some action, holding the segment lock, when a matching Entry is found.
boolean	isComplete(Object oContext) Return true iff further key evaluations for the given context are known to be unnecessary.
boolean	isFound(Object oContext) Return true iff the value was found

Methods inherited from class com.tangosol.util.SegmentedHashMap.EntryActionAdapter

invokeNotFound

Methods inherited from class java.lang.Object

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

Constructor Detail

ContainsValueAction

protected ContainsValueAction()

Method Detail

invokeFound

public Object invokeFound(Object oKey,
                          Object oContext,
                          SegmentedHashMap.Entry[] aeBucket,
                          int nBucket,
                          SegmentedHashMap.Entry entryPrev,
                          SegmentedHashMap.Entry entryCur)

Invoke some action, holding the segment lock, when a matching Entry is found.

Specified by:

invokeFound in interface SegmentedHashMap.EntryAction

Overrides:

invokeFound in class SegmentedHashMap.EntryActionAdapter

Parameters:

oKey - the key to which the action is applied

oContext - opaque context specific to the action

aeBucket - the bucket array

nBucket - the index into the bucket array

entryPrev - the Entry object immediately preceding the Entry that was found, or null

entryCur - the Entry object that was found

Returns:

an opaque result value

isComplete

public boolean isComplete(Object oContext)

Return true iff further key evaluations for the given context are known to be unnecessary.

Specified by:

isComplete in interface SegmentedHashMap.IterableEntryAction

Overrides:

isComplete in class SegmentedHashMap.EntryActionAdapter

Parameters:

oContext - the action context

Returns:

true iff further evaluations are unnecessary

isFound

public boolean isFound(Object oContext)

Return true iff the value was found

Parameters:

oContext - the ContainsValueContext object

Returns:

true iff the value was found

instantiateContext

public Object instantiateContext(Object oValue)

Instantiate a context appropriate for applying ContainsValueAction to lookup oValue in the map.

Parameters:

oValue - the value to test the existence of

Returns:

a context to use with a ContainsValueAction