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public interface JavaObjectRepresents a Java Object.
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Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method Description voidarraycopy(int srcStart, Object dst, int dstStart, int length)Copies data from the image array into a local Java array.booleanequals(Object obj)Compares the argument to the receiver, and answers true if they represent the same object using a class specific comparison.intgetArraySize()Get the number of elements in this array.longgetHashcode()Fetch the basic hash code for the object.JavaHeapgetHeap()Gets the heap where this object is located.ImagePointergetID()The ID of an object is a unique address is memory which identifies the object.JavaClassgetJavaClass()Get the JavaClass instance which represents the class of this object.longgetPersistentHashcode()Fetch the basic hash code of the object in the image.IteratorgetReferences()Get the set of references from this object.IteratorgetSections()An object is represented in the Java runtime by one or more regions of memory.longgetSize()Get the number of bytes of memory occupied by this object on the heap.inthashCode()Answers an integer hash code for the receiver.booleanisArray()Is this object an array?
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Method Detail
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getJavaClass
JavaClass getJavaClass() throws CorruptDataException
Get the JavaClass instance which represents the class of this object.- Returns:
- the JavaClass instance which represents the class of this object
- Throws:
CorruptDataException
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isArray
boolean isArray() throws CorruptDataExceptionIs this object an array?- Returns:
- true if the receiver represents an instance of an array, or false otherwise
- Throws:
CorruptDataException
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getArraySize
int getArraySize() throws CorruptDataExceptionGet the number of elements in this array.- Returns:
- the number of elements in this array
- Throws:
CorruptDataExceptionIllegalArgumentException- if the receiver is not an array
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arraycopy
void arraycopy(int srcStart, Object dst, int dstStart, int length) throws CorruptDataException, MemoryAccessExceptionCopies data from the image array into a local Java array. The dst object must be an array of the appropriate type -- a base type array for base types, or a JavaObject array for reference arrays.- Parameters:
srcStart- index in the receiver to start copying fromdst- the destination arraydstStart- index in the destination array to start copying intolength- the number of elements to be copied- Throws:
CorruptDataExceptionMemoryAccessExceptionNullPointerException- if dst is nullIllegalArgumentException- if the receiver is not an array, or if dst is not an array of the appropriate typeIndexOutOfBoundsException- if srcStart, dstStart, or length are out of bounds in either the receiver or the destination array
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getSize
long getSize() throws CorruptDataExceptionGet the number of bytes of memory occupied by this object on the heap. The memory may not necessarily be contiguous.- Throws:
CorruptDataException
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getHashcode
long getHashcode() throws DataUnavailable, CorruptDataExceptionFetch the basic hash code for the object. This is the hash code which would be returned if a Java thread had requested it. Typically the hash code is based on the address of an object, and may change if the object is moved by a garbage collection cycle.- Returns:
- the basic hash code of the object in the image
- Throws:
DataUnavailable- if the hash code cannot be determinedCorruptDataException- See Also:
getPersistentHashcode()
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getPersistentHashcode
long getPersistentHashcode() throws DataUnavailable, CorruptDataExceptionFetch the basic hash code of the object in the image. This hash code is guaranteed to be persistent between multiple snapshots of the same Image. If the hash code cannot be determined, or if the hash code for this object could change between snapshots, an exception is thrown.If the VM uses a 'hasBeenHashed' bit, the value of this bit can be inferred by calling getPersistentHashcode(). If the persistent hash code is not available, then the 'hasBeenHashed' bit has not been set, and the hash of the object could change if the object moves between snapshots
- Returns:
- the basic hash code of the object in the image
- Throws:
DataUnavailable- if a hash code cannot be determined, or if the hash code could change between successive snapshotsCorruptDataException- See Also:
getHashcode()
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getID
ImagePointer getID()
The ID of an object is a unique address is memory which identifies the object. The data at this memory is implementation defined. The object may be non-contiguous. Portions of the object may appear below or above this address.- Returns:
- the runtime-wide unique identifier for the object
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getSections
Iterator getSections()
An object is represented in the Java runtime by one or more regions of memory. These include the object's header and the data in the object. In certain allocation strategies, an object's header and data may be allocated contiguously. In this case, this method may return an iterator for a single section. In other schemes, the header may be separate from the data or the data may be broken up into multiple regions. Additionally, this function does not guarantee that the memory used by this object is not also shared by one or more other objects. Callers should not make any assumptions about the contents of the memory.- Returns:
- a collection of sections that make up this object
- See Also:
ImageSection,CorruptData
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getReferences
Iterator getReferences()
Get the set of references from this object. Corrupt references will be returned as CorruptData objects by the Iterator.- Returns:
- an iterator of JavaReference and CorruptData objects
- See Also:
JavaReference,CorruptData
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getHeap
JavaHeap getHeap() throws CorruptDataException, DataUnavailable
Gets the heap where this object is located.- Returns:
- the
JavaHeapinstance representing the heap where this object is stored in memory - Throws:
CorruptDataException- if the heap information for this object is corruptDataUnavailable- if the heap information for this object is not available- See Also:
JavaHeap
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equals
boolean equals(Object obj)
Compares the argument to the receiver, and answers true if they represent the same object using a class specific comparison. The implementation in Object answers true only if the argument is the exact same object as the receiver (==).- Overrides:
equalsin classObject- Parameters:
obj- Object the object to compare with this object.- Returns:
- boolean
trueif the object is the same as this objectfalseif it is different from this object. - See Also:
Object.hashCode()
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hashCode
int hashCode()
Answers an integer hash code for the receiver. Any two objects which answertruewhen passed to.equalsmust answer the same value for this method.- Overrides:
hashCodein classObject- Returns:
- the receiver's hash.
- See Also:
Object.equals(java.lang.Object)
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