org.eclipse.mat.internal.collectionextract
Class EmptyCollectionExtractor

java.lang.Object
  extended by org.eclipse.mat.internal.collectionextract.EmptyCollectionExtractor
All Implemented Interfaces:
ICollectionExtractor
Direct Known Subclasses:
EmptyMapExtractor

public class EmptyCollectionExtractor
extends Object
implements ICollectionExtractor

Known-empty collections


Constructor Summary
EmptyCollectionExtractor()
           
 
Method Summary
 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
 Integer getCapacity(IObject coll)
          Return the capacity of the collection, if applicable
 Double getFillRatio(IObject coll)
          Calculate the fill ration of a collection
 Integer getNumberOfNotNullElements(IObject collection)
          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 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 Detail

EmptyCollectionExtractor

public EmptyCollectionExtractor()
Method Detail

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:

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
Returns:
Throws:
SnapshotException

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:

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
Returns:
Throws:
SnapshotException

hasExtractableContents

public boolean hasExtractableContents()
Description copied from interface: ICollectionExtractor
Check if the collection has extractable contents

Specified by:
hasExtractableContents in interface ICollectionExtractor
Returns:

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
Returns:
Throws:
SnapshotException

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:

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
Returns:
Throws:
SnapshotException

getNumberOfNotNullElements

public Integer getNumberOfNotNullElements(IObject collection)
                                   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
Returns:
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:

getFillRatio

public Double getFillRatio(IObject coll)
                    throws SnapshotException
Description copied from interface: ICollectionExtractor
Calculate the fill ration of a collection

Specified by:
getFillRatio in interface ICollectionExtractor
Returns:
Throws:
SnapshotException