Package org.eclipse.mat.snapshot

Class ClassHistogramRecord

java.lang.Object

org.eclipse.mat.snapshot.HistogramRecord

org.eclipse.mat.snapshot.ClassHistogramRecord

All Implemented Interfaces:

Serializable

Direct Known Subclasses:

XClassHistogramRecord

public class ClassHistogramRecord
extends HistogramRecord

This class holds the histogram data on the objects found in the object set for which a histogram was computed (aggregated per class).

See Also:

• Serialized Form

Field Summary

Fields inherited from class org.eclipse.mat.snapshot.HistogramRecord

COMPARATOR_FOR_LABEL, COMPARATOR_FOR_NUMBEROFOBJECTS, COMPARATOR_FOR_RETAINEDHEAPSIZE, COMPARATOR_FOR_USEDHEAPSIZE

Constructor Summary

Constructors

Constructor	Description
ClassHistogramRecord(String label, int classId, int[] objectIds, long usedHeapSize, long retainedHeapSize)	Build a histogram record
ClassHistogramRecord(String label, int classId, long numberOfObjects, long usedHeapSize, long retainedHeapSize)	Build a histogram record

Method Summary

Modifier and Type	Method	Description
long	calculateRetainedSize(ISnapshot snapshot, boolean calculateIfNotAvailable, boolean approximation, IProgressListener listener)	Find out the retained size
int	getClassId()	Get id of the class this class histogram record stands for.
int[]	getObjectIds()	Get ids of the objects this class histogram record stands for.
String	toString()

Methods inherited from class org.eclipse.mat.snapshot.HistogramRecord

getLabel, getNumberOfObjects, getRetainedHeapSize, getUsedHeapSize, incNumberOfObjects, incNumberOfObjects, incRetainedHeapSize, incUsedHeapSize, reverseComparator, setLabel, setNumberOfObjects, setRetainedHeapSize, setUsedHeapSize

Methods inherited from class java.lang.Object

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

Constructor Details

ClassHistogramRecord

public ClassHistogramRecord(String label,
 int classId,
 long numberOfObjects,
 long usedHeapSize,
 long retainedHeapSize)

Build a histogram record

Parameters:

label - the class name

classId - the id of the class

numberOfObjects - the number of objects of that class

usedHeapSize - the space used by those objects

retainedHeapSize - the total of the size of all the objects retained by those objects. 0 means calculate when required, negative means approximate size, positive means exact retained size is known.

ClassHistogramRecord

public ClassHistogramRecord(String label,
 int classId,
 int[] objectIds,
 long usedHeapSize,
 long retainedHeapSize)

Build a histogram record

Parameters:

label - the class name

classId - the id of the class

objectIds - the ids of objects of that class

usedHeapSize - the space used by those objects

retainedHeapSize - the total of the size of all the objects retained by those objects. 0 means calculate when required, negative means approximate size, positive means exact retained size is known.

Method Details

getClassId

public int getClassId()

Get id of the class this class histogram record stands for.

Returns:

id of the class this class histogram record stands for

getObjectIds

public int[] getObjectIds()

Get ids of the objects this class histogram record stands for.

Returns:

ids of the objects this class histogram record stands for

calculateRetainedSize

public long calculateRetainedSize(ISnapshot snapshot,
 boolean calculateIfNotAvailable,
 boolean approximation,
 IProgressListener listener)
                           throws SnapshotException

Find out the retained size

Parameters:

snapshot - the snapshot

calculateIfNotAvailable - whether to calculate the size if not already available

approximation - whether to use an approximation to the retained size (sum of the individual retained sizes)

listener - to report progress and errors

Returns:

the retained size, negated if approximate, 0 if not available

Throws:

SnapshotException

toString

public String toString()

Overrides:

toString in class Object