Package org.eclipse.mat.internal.collectionextract

Class WrapperSetFromMapExtractor

java.lang.Object

org.eclipse.mat.internal.collectionextract.WrapperCollectionExtractor

org.eclipse.mat.internal.collectionextract.WrapperSetFromMapExtractor

All Implemented Interfaces:

ICollectionExtractor, IMapExtractor

public class WrapperSetFromMapExtractor
extends WrapperCollectionExtractor
implements IMapExtractor

Creates an extractor to view a map as a set. Just treating it as a map does not work as extractEntryIds needs to return the keys, not the nodes of type Map.Entry.

Nested Class Summary

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

IMapExtractor.EntryObject

Constructor Summary

Constructors

Constructor	Description
WrapperSetFromMapExtractor(String setField, String mapField)

Method Summary

Modifier and Type	Method	Description
Iterator<Map.Entry<IObject,IObject>>	extractMapEntries(IObject collection)	Extracts the contents of a map (i.e.
Double	getCollisionRatio(IObject collection)	Calculates the collision ratio in the collection.
boolean	hasCollisionRatio()	Check if the extractor can calculate collision ratio

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

extractEntries, extractEntryIds, getCapacity, getFillRatio, getNumberOfNotNullElements, getSize, hasCapacity, hasExtractableArray, hasExtractableContents, hasFillRatio, hasSize

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, getCapacity, getFillRatio, getNumberOfNotNullElements, getSize, hasCapacity, hasExtractableArray, hasExtractableContents, hasFillRatio, hasSize

Constructor Details

WrapperSetFromMapExtractor

public WrapperSetFromMapExtractor(String setField,
 String mapField)

Method Details

hasCollisionRatio

public boolean hasCollisionRatio()

Description copied from interface: IMapExtractor

Check if the extractor can calculate collision ratio

Specified by:

hasCollisionRatio in interface IMapExtractor

Returns:

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

See Also:

• IMapExtractor.getCollisionRatio(IObject)

getCollisionRatio

public Double getCollisionRatio(IObject collection)
                         throws SnapshotException

Description copied from interface: IMapExtractor

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

Specified by:

getCollisionRatio in interface IMapExtractor

Parameters:

collection - - the collection to calculate the collision ratio of

Returns:

Double number of elements with colliding keys / size

Throws:

SnapshotException

See Also:

• IMapExtractor.hasCollisionRatio()

extractMapEntries

public Iterator<Map.Entry<IObject,IObject>> extractMapEntries(IObject collection)
                                                       throws SnapshotException

Description copied from interface: IMapExtractor

Extracts the contents of a map (i.e. an IObject representing a Map) and provides an Iterator over them

Specified by:

extractMapEntries in interface IMapExtractor

Parameters:

collection - - the map to extract contents from

Returns:

an Iterator over the entries. If the original Map had an Entry object, the content of the iterator would usually be EntryObject

Throws:

SnapshotException