Package org.eclipse.mat.internal.collectionextract

Class SingletonMapExtractor

java.lang.Object

org.eclipse.mat.internal.collectionextract.SingletonMapExtractor

All Implemented Interfaces:

ICollectionExtractor, IMapExtractor

public class SingletonMapExtractor
extends Object
implements IMapExtractor

Nested Class Summary

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

IMapExtractor.EntryObject

Constructor Summary

Constructors

Constructor	Description
SingletonMapExtractor(String keyField, String valueField)

Method Summary

Modifier and Type	Method	Description
IObjectArray	extractEntries(IObject coll)	Extracts the array containing the collection content
int[]	extractEntryIds(IObject coll)	Returns the object ids (int) for all objects which are contained in the collection
Iterator<Map.Entry<IObject,IObject>>	extractMapEntries(IObject coll)	Extracts the contents of a map (i.e.
Integer	getCapacity(IObject coll)	Return the capacity of the collection, if applicable
Double	getCollisionRatio(IObject coll)	Calculates the collision ratio in the collection.
Double	getFillRatio(IObject coll)	Calculate the fill ratio of a collection
Integer	getNumberOfNotNullElements(IObject coll)	Returns the number of non-null elements in the collection.
Integer	getSize(IObject coll)	Extract the size of the collection.
boolean	hasCapacity()	Check if the collection has capacity, e.g.
boolean	hasCollisionRatio()	Check if the extractor can calculate collision ratio
boolean	hasExtractableArray()	Return true if the collection array based and the array can be extracted from the heap dump
boolean	hasExtractableContents()	Check if the collection has extractable contents
boolean	hasFillRatio()	Check if fill ratio for the collection can be calculated, i.e.
boolean	hasSize()	Check if the size of the collection can be extracted.

Methods inherited from class java.lang.Object

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

Constructor Details

SingletonMapExtractor

public SingletonMapExtractor(String keyField,
 String valueField)

Method Details

hasSize

public boolean hasSize()

Description copied from interface: ICollectionExtractor

Check if the size of the collection can be extracted.

Specified by:

hasSize in interface ICollectionExtractor

Returns:

true if ICollectionExtractor.getSize(IObject) could be called

See Also:

• ICollectionExtractor.getSize(IObject)

getSize

public Integer getSize(IObject coll)
                throws SnapshotException

Description copied from interface: ICollectionExtractor

Extract the size of the collection.

Specified by:

getSize in interface ICollectionExtractor

Parameters:

coll - - the collection to find the size of

Returns:

the size, or null if not available

Throws:

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

See Also:

• ICollectionExtractor.hasSize()

hasCapacity

public boolean hasCapacity()

Description copied from interface: ICollectionExtractor

Check if the collection has capacity, e.g. ArrayList

Specified by:

hasCapacity in interface ICollectionExtractor

Returns:

true if ICollectionExtractor.getCapacity(IObject) could be called

See Also:

• ICollectionExtractor.getCapacity(IObject)

getCapacity

public Integer getCapacity(IObject coll)
                    throws SnapshotException

Description copied from interface: ICollectionExtractor

Return the capacity of the collection, if applicable

Specified by:

getCapacity in interface ICollectionExtractor

Parameters:

coll - - the collection to find the capacity of

Returns:

the capacity in bytes, or null if unavailable

Throws:

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

See Also:

• ICollectionExtractor.hasCapacity()

hasExtractableContents

public boolean hasExtractableContents()

Description copied from interface: ICollectionExtractor

Check if the collection has extractable contents

Specified by:

hasExtractableContents in interface ICollectionExtractor

Returns:

true if ICollectionExtractor.extractEntryIds(IObject) could be called

See Also:

• ICollectionExtractor.extractEntryIds(IObject)

extractEntryIds

public int[] extractEntryIds(IObject coll)
                      throws SnapshotException

Description copied from interface: ICollectionExtractor

Returns the object ids (int) for all objects which are contained in the collection

Specified by:

extractEntryIds in interface ICollectionExtractor

Parameters:

coll - - the collection to find the objects it holds

Returns:

an array of ints which are the object ids.

Throws:

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

See Also:

• ICollectionExtractor.hasExtractableContents()

hasExtractableArray

public boolean hasExtractableArray()

Description copied from interface: ICollectionExtractor

Return true if the collection array based and the array can be extracted from the heap dump

Specified by:

hasExtractableArray in interface ICollectionExtractor

Returns:

true if ICollectionExtractor.extractEntries(IObject) could be called

See Also:

• ICollectionExtractor.extractEntries(IObject)

extractEntries

public IObjectArray extractEntries(IObject coll)
                            throws SnapshotException

Description copied from interface: ICollectionExtractor

Extracts the array containing the collection content

Specified by:

extractEntries in interface ICollectionExtractor

Parameters:

coll - - the collection to find the object array holding its contents

Returns:

the backing array for the collection

Throws:

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

See Also:

• ICollectionExtractor.hasExtractableArray()

getNumberOfNotNullElements

public Integer getNumberOfNotNullElements(IObject coll)
                                   throws SnapshotException

Description copied from interface: ICollectionExtractor

Returns the number of non-null elements in the collection. Requires hasExtractableContents or hasExtractableArray

Specified by:

getNumberOfNotNullElements in interface ICollectionExtractor

Parameters:

coll - - the collection to find the number of non-null content objects

Returns:

the number of non-null elements, or null if not available

Throws:

SnapshotException

See Also:

• ICollectionExtractor.hasExtractableContents()
• ICollectionExtractor.hasExtractableArray()

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 coll)
                         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:

coll - - 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 coll)
                                                       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:

coll - - 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

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.

Specified by:

hasFillRatio in interface ICollectionExtractor

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

Specified by:

getFillRatio in interface ICollectionExtractor

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()