Package org.eclipse.mat.internal.collectionextract

Class HashedMapCollectionExtractorBase

java.lang.Object

org.eclipse.mat.internal.collectionextract.MapCollectionExtractorBase

org.eclipse.mat.internal.collectionextract.HashedMapCollectionExtractorBase

All Implemented Interfaces:

ICollectionExtractor, IMapExtractor

Direct Known Subclasses:

ConcurrentHashMapCollectionExtractor, ConcurrentSkipListCollectionExtractor, HashMapCollectionExtractor

public abstract class HashedMapCollectionExtractorBase
extends MapCollectionExtractorBase

Nested Class Summary

Nested classes/interfaces inherited from interface org.eclipse.mat.inspections.collectionextract.IMapExtractor

IMapExtractor.EntryObject

Constructor Summary

Constructors

Constructor	Description
HashedMapCollectionExtractorBase(String arrayField, String keyField, String valueField)

Method Summary

Modifier and Type	Method	Description
Double	getCollisionRatio(IObject coll)	Calculates the collision ratio in the collection.
Double	getFillRatio(IObject coll)	Calculate the fill ratio of a collection
boolean	hasCollisionRatio()	Check if the extractor can calculate collision ratio
boolean	hasFillRatio()	Check if fill ratio for the collection can be calculated, i.e.

Methods inherited from class org.eclipse.mat.internal.collectionextract.MapCollectionExtractorBase

extractMapEntries, getCapacity, hasCapacity

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.eclipse.mat.inspections.collectionextract.ICollectionExtractor

extractEntries, extractEntryIds, getNumberOfNotNullElements, getSize, hasExtractableArray, hasExtractableContents, hasSize

Constructor Details

HashedMapCollectionExtractorBase

public HashedMapCollectionExtractorBase(String arrayField,
 String keyField,
 String valueField)

Method Details

hasFillRatio

public boolean hasFillRatio()

Description copied from interface: ICollectionExtractor

Check if fill ratio for the collection can be calculated, i.e. if it has some predefined capacity and actual size.

Returns:

true if ICollectionExtractor.getFillRatio(IObject) could be called

See Also:

• ICollectionExtractor.getFillRatio(IObject)

getFillRatio

public Double getFillRatio(IObject coll)
                    throws SnapshotException

Description copied from interface: ICollectionExtractor

Calculate the fill ratio of a collection

Parameters:

coll - - the collection to find the fill ratio of

Returns:

the fill ratio, between 0.0 and 1.0, or null if unavailable

Throws:

SnapshotException - if there is a problem retrieving data from the snapshot

See Also:

• ICollectionExtractor.hasFillRatio()

hasCollisionRatio

public boolean hasCollisionRatio()

Description copied from interface: IMapExtractor

Check if the extractor can calculate collision ratio

Returns:

true if @IMapExtractor.getCollisionRatio(IObject) could be called

See Also:

• IMapExtractor.getCollisionRatio(IObject)

getCollisionRatio

public Double getCollisionRatio(IObject coll)
                         throws SnapshotException

Description copied from interface: IMapExtractor

Calculates the collision ratio in the collection. Could be an estimate.

Parameters:

coll - - the collection to calculate the collision ratio of

Returns:

Double number of elements with colliding keys / size

Throws:

SnapshotException

See Also:

• IMapExtractor.hasCollisionRatio()