com.sun.jdi
Interface ClassType

All Superinterfaces:

Accessible, Comparable, Mirror, ReferenceType, Type

public interface ClassType

extends ReferenceType

A mirror of a class in the target VM. A ClassType is a refinement of ReferenceType that applies to true classes in the JLS sense of the definition (not an interface, not an array type). Any ObjectReference that mirrors an instance of such a class will have a ClassType as its type.

Since:

1.3

See Also:

ObjectReference

Field Summary

static int

INVOKE_SINGLE_THREADED Perform method invocation with only the invoking thread resumed

Method Summary

List	allInterfaces() Gets the interfaces directly and indirectly implemented by this class.
Method	concreteMethodByName(String name, String signature) Returns a the single non-abstract Method visible from this class that has the given name and signature.
List	interfaces() Gets the interfaces directly implemented by this class.
Value	invokeMethod(ThreadReference thread, Method method, List arguments, int options) Invokes the specified static Method in the target VM.
ObjectReference	newInstance(ThreadReference thread, Method method, List arguments, int options) Constructs a new instance of this type, using the given constructor Method in the target VM.
void	setValue(Field field, Value value) Assigns a value to a static field.
List	subclasses() Gets the currently loaded, direct subclasses of this class.
ClassType	superclass() Gets the superclass of this class.

Methods inherited from interface com.sun.jdi.ReferenceType

allFields, allLineLocations, allLineLocations, allMethods, availableStrata, classLoader, classObject, defaultStratum, equals, failedToInitialize, fieldByName, fields, getValue, getValues, hashCode, isAbstract, isFinal, isInitialized, isPrepared, isStatic, isVerified, locationsOfLine, locationsOfLine, methods, methodsByName, methodsByName, name, nestedTypes, sourceDebugExtension, sourceName, sourceNames, sourcePaths, visibleFields, visibleMethods

Methods inherited from interface com.sun.jdi.Type

signature

Methods inherited from interface com.sun.jdi.Mirror

toString, virtualMachine

Methods inherited from interface java.lang.Comparable

compareTo

Methods inherited from interface com.sun.jdi.Accessible

isPackagePrivate, isPrivate, isProtected, isPublic, modifiers

Field Detail

INVOKE_SINGLE_THREADED

public static final int INVOKE_SINGLE_THREADED

Perform method invocation with only the invoking thread resumed

See Also:

Constant Field Values

Method Detail

superclass

public ClassType superclass()

Gets the superclass of this class.

Returns:

a ClassType that mirrors the superclass of this class in the target VM. If no such class exists, returns null

interfaces

public List interfaces()

Gets the interfaces directly implemented by this class. Only the interfaces that are declared with the "implements" keyword in this class are included.

Returns:

a List of InterfaceType objects each mirroring a direct interface this ClassType in the target VM. If none exist, returns a zero length List.

Throws:

ClassNotPreparedException - if this class not yet been prepared.

allInterfaces

public List allInterfaces()

Gets the interfaces directly and indirectly implemented by this class. Interfaces returned by interfaces() are returned as well all superinterfaces.

Returns:

a List of InterfaceType objects each mirroring an interface of this ClassType in the target VM. If none exist, returns a zero length List.

Throws:

ClassNotPreparedException - if this class not yet been prepared.

subclasses

public List subclasses()

Gets the currently loaded, direct subclasses of this class. No ordering of this list is guaranteed.

Returns:

a List of ClassType objects each mirroring a loaded subclass of this class in the target VM. If no such classes exist, this method returns a zero-length list.

setValue

public void setValue(Field field,
                     Value value)
              throws InvalidTypeException,
                     ClassNotLoadedException

Assigns a value to a static field. The Field must be valid for this ObjectReference; that is, there must be a widening reference conversion from this object to the field's type. The field must not be final.

Object values must be assignment compatible with the field type (This implies that the field type must be loaded through the enclosing class's class loader). Primitive values must be either assignment compatible with the field type or must be convertible to the field type without loss of information. See JLS section 5.2 for more information on assignment compatibility.

Parameters:

field - the field to set.

value - the value to be assigned.

Throws:

IllegalArgumentException - if the field is not static, the field is final, or the field does not exist in this class.

ClassNotLoadedException - if the field type has not yet been loaded through the appropriate class loader.

InvalidTypeException - if the value's type does not match the field's declared type.

invokeMethod

public Value invokeMethod(ThreadReference thread,
                          Method method,
                          List arguments,
                          int options)
                   throws InvalidTypeException,
                          ClassNotLoadedException,
                          IncompatibleThreadStateException,
                          InvocationException

Invokes the specified static Method in the target VM. The specified method can be defined in this class, or in a superclass. The method must be a static method but not a static initializer. Use newInstance(com.sun.jdi.ThreadReference, com.sun.jdi.Method, java.util.List, int) to create a new object and run its constructor.

The method invocation will occur in the specified thread. Method invocation can occur only if the specified thread has been suspended by an event which occurred in that thread. Method invocation is not supported when the target VM has been suspended through VirtualMachine.suspend() or when the specified thread is suspended through ThreadReference.suspend().

The specified method is invoked with the arguments in the specified argument list. The method invocation is synchronous; this method does not return until the invoked method returns in the target VM. If the invoked method has a return type other than void, a mirror of the return value is returned by this method; otherwise, null is returned. If the invoked method throws an exception, this method will throw an InvocationException which contains a mirror to the exception object thrown.

Object arguments must be assignment compatible with the argument type (This implies that the argument type must be loaded through the enclosing class's class loader). Primitive arguments must be either assignment compatible with the argument type or must be convertible to the argument type without loss of information. See JLS section 5.2 for more information on assignment compatibility.

By default, all threads in the target VM are resumed while the method is being invoked if they were previously suspended by an event or by VirtualMachine.suspend() or ThreadReference.suspend(). This is done to prevent the deadlocks that will occur if any of the threads own monitors that will be needed by the invoked method. It is possible that breakpoints or other events might occur during the invocation. Note, however, that this implicit resume acts exactly like ThreadReference.resume(), so if the thread's suspend count is greater than 1, it will remain in a suspended state during the invocation. By default, when the invocation completes, all threads in the target VM are suspended, regardless their state before the invocation.

The resumption of other threads during the invocation can be prevented by specifying the INVOKE_SINGLE_THREADED bit flag in the options argument; however, there is no protection against or recovery from the deadlocks described above, so this option should be used with great caution. Only the specified thread will be resumed (as described for all threads above). Upon completion of a single threaded invoke, the invoking thread will be suspended once again. Note that any threads started during the single threaded invocation will not be suspended when the invocation completes.

If the target VM is disconnected during the invoke (for example, through VirtualMachine.dispose()) the method invocation continues.

Parameters:

thread - the thread in which to invoke.

method - the Method to invoke.

arguments - the list of Value arguments bound to the invoked method. Values from the list are assigned to arguments in the order they appear in the method signature.

options - the integer bit flag options.

Returns:

a Value mirror of the invoked method's return value.

Throws:

IllegalArgumentException - if the method is not a member of this class or a superclass, if the size of the argument list does not match the number of declared arguemnts for the method, or if the method is an initializer, constructor or static intializer.

{@link - InvalidTypeException} if any argument in the argument list is not assignable to the corresponding method argument type.

ClassNotLoadedException - if any argument type has not yet been loaded through the appropriate class loader.

IncompatibleThreadStateException - if the specified thread has not been suspended by an event.

InvocationException - if the method invocation resulted in an exception in the target VM.

InvalidTypeException - If the arguments do not meet this requirement -- Object arguments must be assignment compatible with the argument type. This implies that the argument type must be loaded through the enclosing class's class loader. Primitive arguments must be either assignment compatible with the argument type or must be convertible to the argument type without loss of information. See JLS section 5.2 for more information on assignment compatibility.

newInstance

public ObjectReference newInstance(ThreadReference thread,
                                   Method method,
                                   List arguments,
                                   int options)
                            throws InvalidTypeException,
                                   ClassNotLoadedException,
                                   IncompatibleThreadStateException,
                                   InvocationException

Constructs a new instance of this type, using the given constructor Method in the target VM. The specified constructor must be defined in this class.

Instance creation will occur in the specified thread. Instance creation can occur only if the specified thread has been suspended by an event which occurred in that thread. Instance creation is not supported when the target VM has been suspended through VirtualMachine.suspend() or when the specified thread is suspended through ThreadReference.suspend().

The specified constructor is invoked with the arguments in the specified argument list. The invocation is synchronous; this method does not return until the constructor returns in the target VM. If the invoked method throws an exception, this method will throw an InvocationException which contains a mirror to the exception object thrown.

Object arguments must be assignment compatible with the argument type (This implies that the argument type must be loaded through the enclosing class's class loader). Primitive arguments must be either assignment compatible with the argument type or must be convertible to the argument type without loss of information. See JLS section 5.2 for more information on assignment compatibility.

By default, all threads in the target VM are resumed while the method is being invoked if they were previously suspended by an event or by VirtualMachine.suspend() or ThreadReference.suspend(). This is done to prevent the deadlocks that will occur if any of the threads own monitors that will be needed by the invoked method. It is possible that breakpoints or other events might occur during the invocation. Note, however, that this implicit resume acts exactly like ThreadReference.resume(), so if the thread's suspend count is greater than 1, it will remain in a suspended state during the invocation. By default, when the invocation completes, all threads in the target VM are suspended, regardless their state before the invocation.

The resumption of other threads during the invocation can be prevented by specifying the INVOKE_SINGLE_THREADED bit flag in the options argument; however, there is no protection against or recovery from the deadlocks described above, so this option should be used with great caution. Only the specified thread will be resumed (as described for all threads above). Upon completion of a single threaded invoke, the invoking thread will be suspended once again. Note that any threads started during the single threaded invocation will not be suspended when the invocation completes.

If the target VM is disconnected during the invoke (for example, through VirtualMachine.dispose()) the method invocation continues.

Parameters:

thread - the thread in which to invoke.

method - the constructor Method to invoke.

arguments - the list of Value arguments bound to the invoked constructor. Values from the list are assigned to arguments in the order they appear in the constructor signature.

options - the integer bit flag options.

Returns:

an ObjectReference mirror of the newly created object.

Throws:

IllegalArgumentException - if the method is not a member of this class, if the size of the argument list does not match the number of declared arguments for the constructor, or if the method is not a constructor.

{@link - InvalidTypeException} if any argument in the argument list is not assignable to the corresponding method argument type.

ClassNotLoadedException - if any argument type has not yet been loaded through the appropriate class loader.

IncompatibleThreadStateException - if the specified thread has not been suspended by an event.

InvocationException - if the method invocation resulted in an exception in the target VM.

InvalidTypeException - If the arguments do not meet this requirement -- Object arguments must be assignment compatible with the argument type. This implies that the argument type must be loaded through the enclosing class's class loader. Primitive arguments must be either assignment compatible with the argument type or must be convertible to the argument type without loss of information. See JLS section 5.2 for more information on assignment compatibility.

concreteMethodByName

public Method concreteMethodByName(String name,
                                   String signature)

Returns a the single non-abstract Method visible from this class that has the given name and signature. See ReferenceType.methodsByName(java.lang.String, java.lang.String) for information on signature format.

The returned method (if non-null) is a component of ClassType.

Parameters:

name - the name of the method to find.

signature - the signature of the method to find

Returns:

the Method that matches the given name and signature or null if there is no match.

Throws:

ClassNotPreparedException - if methods are not yet available becasue the class has not yet been prepared.

See Also:

ReferenceType.visibleMethods(), ReferenceType.methodsByName(java.lang.String name), ReferenceType.methodsByName(java.lang.String name, java.lang.String signature)