Package org.eclipse.jdt.debug.core

Interface IJavaObject

All Superinterfaces:

IAdaptable, IDebugElement, IJavaValue, IValue

All Known Subinterfaces:

IJavaArray, IJavaClassObject

public interface IJavaObject
extends IJavaValue

A value referencing an object on a target VM.

Since:

2.0

See Also:

IJavaValue

Restriction:

This interface is not intended to be implemented by clients.

Restriction:

This interface is not intended to be extended by clients.

Method Summary

Modifier and Type	Method	Description
void	disableCollection()	Prevents this object from being garbage collected.
void	enableCollection()	Permits this object to be garbage collected.
IJavaFieldVariable	getField(String name, boolean superField)	Returns a variable representing the field in this object with the given name, or null if there is no field with the given name, or the name is ambiguous.
IJavaFieldVariable	getField(String name, String typeSignature)	Returns a variable representing the field in this object with the given name declared in the type with the given signature, or null if there is no field with the given name, or the name is ambiguous.
IJavaThread	getOwningThread()	Returns the threads which owns for the monitor associated to this object, or null if no thread owns the monitor.
IJavaObject[]	getReferringObjects(long max)	Returns objects that directly reference this object.
long	getUniqueId()	Returns the unique id for this object.
IJavaThread[]	getWaitingThreads()	Returns the threads waiting for the monitor associated to this object, or null if no thread is waiting for the monitor.
IJavaValue	sendMessage(String selector, String signature, IJavaValue[] args, IJavaThread thread, boolean superSend)	Returns the result of sending the specified message to this object with the given arguments in the specified thread.
IJavaValue	sendMessage(String selector, String signature, IJavaValue[] args, IJavaThread thread, String typeSignature)	Returns the result of sending the specified message on the specified declaring type to this object with the given arguments in the specified thread.

Methods inherited from interface org.eclipse.core.runtime.IAdaptable

getAdapter

Methods inherited from interface org.eclipse.debug.core.model.IDebugElement

getDebugTarget, getLaunch, getModelIdentifier

Methods inherited from interface org.eclipse.jdt.debug.core.IJavaValue

getGenericSignature, getJavaType, getSignature, isNull

Methods inherited from interface org.eclipse.debug.core.model.IValue

getReferenceTypeName, getValueString, getVariables, hasVariables, isAllocated

Method Detail

sendMessage

IJavaValue sendMessage(String selector,
                       String signature,
                       IJavaValue[] args,
                       IJavaThread thread,
                       boolean superSend)
                throws DebugException

Returns the result of sending the specified message to this object with the given arguments in the specified thread. The given thread is resumed to perform the method invocation. The thread will suspend in its original location when the method invocation is complete. This method does not return until the method invocation is complete. Invoking a method in the target VM can result in breakpoints being hit, infinite loops, and deadlock.

Parameters:

selector - the selector of the method to be invoked

signature - the JNI style signature of the method to be invoked

args - the arguments of the method, which can be null or empty if there are none

thread - the thread in which to invoke the method

superSend - true if the method lookup should begin in this object's superclass

Returns:

the result of invoking the method

Throws:

DebugException - if this method fails. Reasons include:

• Failure communicating with the VM. The DebugException's status code contains the underlying exception responsible for the failure.
• This object does not implement the specified method
• An exception occurs while invoking the specified method
• The given thread is already performing a message send, (status code IJavaThread.ERR_NESTED_METHOD_INVOCATION)
• The given thread is not currently suspended (status code IJavaThread.ERR_THREAD_NOT_SUSPENDED)
• The given thread was explicitly suspended (status code IJavaThread.ERR_INCOMPATIBLE_THREAD_STATE)

sendMessage

IJavaValue sendMessage(String selector,
                       String signature,
                       IJavaValue[] args,
                       IJavaThread thread,
                       String typeSignature)
                throws DebugException

Returns the result of sending the specified message on the specified declaring type to this object with the given arguments in the specified thread. The given thread is resumed to perform the method invocation. The thread will suspend in its original location when the method invocation is complete. This method does not return until the method invocation is complete. Invoking a method in the target VM can result in breakpoints being hit, infinite loops, and deadlock.

Parameters:

selector - the selector of the method to be invoked

signature - the JNI style signature of the method to be invoked

args - the arguments of the method, which can be null or empty if there are none

thread - the thread in which to invoke the method

typeSignature - the signature of the type in which the method is defined or null if the method should be invoked normally using polymorphism

Returns:

the result of invoking the method

Throws:

DebugException - if this method fails. Reasons include:

• Failure communicating with the VM. The DebugException's status code contains the underlying exception responsible for the failure.
• This object does not implement the specified method
• An exception occurs while invoking the specified method
• The given thread is already performing a message send, (status code IJavaThread.ERR_NESTED_METHOD_INVOCATION)
• The given thread is not currently suspended (status code IJavaThread.ERR_THREAD_NOT_SUSPENDED)
• The given thread was explicitly suspended (status code IJavaThread.ERR_INCOMPATIBLE_THREAD_STATE)

Since:

2.0.1

getField

IJavaFieldVariable getField(String name,
                            boolean superField)
                     throws DebugException

Returns a variable representing the field in this object with the given name, or null if there is no field with the given name, or the name is ambiguous.

Parameters:

name - field name

superField - whether or not to get the field in the superclass of this objects.

Returns:

the variable representing the field, or null

Throws:

DebugException - if this method fails. Reasons include:

• Failure communicating with the VM. The DebugException's status code contains the underlying exception responsible for the failure.

getField

IJavaFieldVariable getField(String name,
                            String typeSignature)
                     throws DebugException

Returns a variable representing the field in this object with the given name declared in the type with the given signature, or null if there is no field with the given name, or the name is ambiguous.

Parameters:

name - field name

typeSignature - the signature of the type in which the field is defined

Returns:

the variable representing the field, or null

Throws:

DebugException - if this method fails. Reasons include:

• Failure communicating with the VM. The DebugException's status code contains the underlying exception responsible for the failure.

getWaitingThreads

IJavaThread[] getWaitingThreads()
                         throws DebugException

Returns the threads waiting for the monitor associated to this object, or null if no thread is waiting for the monitor.

Returns:

the thread waiting for the monitor, or null.

Throws:

DebugException - if this method fails. Reasons include:

• The VM is not able to retrieve the monitor information
• Failure communicating with the VM. The DebugException's status code contains the underlying exception responsible for the failure.

Since:

3.1

getOwningThread

IJavaThread getOwningThread()
                     throws DebugException

Returns the threads which owns for the monitor associated to this object, or null if no thread owns the monitor.

Returns:

the thread which owns the monitor, or null.

Throws:

DebugException - if this method fails. Reasons include:

• The VM is not able to retrieve the monitor information
• Failure communicating with the VM. The DebugException's status code contains the underlying exception responsible for the failure.

Since:

3.1

getReferringObjects

IJavaObject[] getReferringObjects(long max)
                           throws DebugException

Returns objects that directly reference this object.

Parameters:

max - the maximum number of references to retrieve or 0 for all references

Returns:

objects that directly reference this object

Throws:

DebugException - if the request fails

Since:

3.3

enableCollection

void enableCollection()
               throws DebugException

Permits this object to be garbage collected. Has no effect if this VM does not support enabling/disabling of garbage collection of specific objects.

Throws:

DebugException - if request fails

Since:

3.4

See Also:

IJavaDebugTarget

disableCollection

void disableCollection()
                throws DebugException

Prevents this object from being garbage collected. Has no effect if this VM does not support enabling/disabling of garbage collection of specific objects.

Throws:

DebugException - if request fails

Since:

3.4

See Also:

IJavaDebugTarget

getUniqueId

long getUniqueId()
          throws DebugException

Returns the unique id for this object.

Returns:

unique id or -1 if this value is null

Throws:

DebugException - if the request fails

Since:

3.4