Package org.eclipse.mat.hprof
Class HprofHeapObjectReader
- java.lang.Object
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- org.eclipse.mat.hprof.HprofHeapObjectReader
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- All Implemented Interfaces:
IObjectReader
public class HprofHeapObjectReader extends Object implements IObjectReader
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Field Summary
Fields Modifier and Type Field Description static String
HPROF_HEAP_START
static String
HPROF_LENGTH_PROPERTY
static String
VERSION_PROPERTY
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Constructor Summary
Constructors Constructor Description HprofHeapObjectReader()
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description void
close()
tidy up when snapshot no longer required<A> A
getAddon(Class<A> addon)
Returns extra data to be provided byISnapshot.getSnapshotAddons(Class addon)
.void
open(ISnapshot snapshot)
Open the dump file associated with the snapshotIObject
read(int objectId, ISnapshot snapshot)
Get detailed information about an objectlong[]
readObjectArrayContent(ObjectArrayImpl array, int offset, int length)
Get detailed information about a object arrayObject
readPrimitiveArrayContent(PrimitiveArrayImpl array, int offset, int length)
Get detailed information about a primitive array
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Field Detail
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VERSION_PROPERTY
public static final String VERSION_PROPERTY
- See Also:
- Constant Field Values
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HPROF_LENGTH_PROPERTY
public static final String HPROF_LENGTH_PROPERTY
- See Also:
- Constant Field Values
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HPROF_HEAP_START
public static final String HPROF_HEAP_START
- See Also:
- Constant Field Values
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Method Detail
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open
public void open(ISnapshot snapshot) throws IOException
Description copied from interface:IObjectReader
Open the dump file associated with the snapshot- Specified by:
open
in interfaceIObjectReader
- Parameters:
snapshot
- the snapshot- Throws:
IOException
- an IO problem, or corrupt indexes or unexpected data in the dump
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readObjectArrayContent
public long[] readObjectArrayContent(ObjectArrayImpl array, int offset, int length) throws IOException, SnapshotException
Description copied from interface:IObjectReader
Get detailed information about a object array- Specified by:
readObjectArrayContent
in interfaceIObjectReader
- Parameters:
array
- the arrayoffset
- where in the array to startlength
- how much to read- Returns:
- an array of object addresses, with 0 for nulls
- Throws:
IOException
- an IO problem or unexpected data in the dumpSnapshotException
- some other problem such as where the object is incompatible with the snapshot
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readPrimitiveArrayContent
public Object readPrimitiveArrayContent(PrimitiveArrayImpl array, int offset, int length) throws IOException, SnapshotException
Description copied from interface:IObjectReader
Get detailed information about a primitive array- Specified by:
readPrimitiveArrayContent
in interfaceIObjectReader
- Parameters:
array
- the arrayoffset
- where in the array to startlength
- how much to read- Returns:
- a byte[], short[], int[], long[], boolean[], char[], float[], double[]
- Throws:
IOException
- an IO problem or unexpected data in the dumpSnapshotException
- some other problem such as where the object is incompatible with the snapshot
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read
public IObject read(int objectId, ISnapshot snapshot) throws SnapshotException, IOException
Description copied from interface:IObjectReader
Get detailed information about an object- Specified by:
read
in interfaceIObjectReader
- Parameters:
objectId
- the object idsnapshot
- the snapshot- Returns:
- an IObject such as
InstanceImpl
,ObjectArrayImpl
,PrimitiveArrayImpl
,ClassLoaderImpl
- Throws:
SnapshotException
- some other problem such as where the object is incompatible with the snapshotIOException
- an IO problem or unexpected data in the dump
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getAddon
public <A> A getAddon(Class<A> addon) throws SnapshotException
Returns extra data to be provided byISnapshot.getSnapshotAddons(Class addon)
. Also can be returned viaArgument
.- Specified by:
getAddon
in interfaceIObjectReader
- Type Parameters:
A
- used to set the return type- Parameters:
addon
- the type of the extra data required from the dump. HprofHeapObjectReader can be extended using anIRuntimeEnhancer
extension to return extra data.- Returns:
- the extra data
- Throws:
SnapshotException
- an IO problem or unexpected data in the dump- See Also:
IObjectReader.getAddon(Class)
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close
public void close() throws IOException
Description copied from interface:IObjectReader
tidy up when snapshot no longer required- Specified by:
close
in interfaceIObjectReader
- Throws:
IOException
- should not normally occur
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