Interface MethodHandleDesc

Method Details

• of

  static DirectMethodHandleDesc of(DirectMethodHandleDesc.Kind kind, ClassDesc owner, String name, String lookupDescriptor)

  Creates a MethodHandleDesc corresponding to an invocation of a declared method, invocation of a constructor, or access to a field.

  The lookup descriptor string has the same format as for the various variants of CONSTANT_MethodHandle_info and for the lookup methods on MethodHandles.Lookup. For a method or constructor invocation, it is interpreted as a method type descriptor; for field access, it is interpreted as a field descriptor. If kind is CONSTRUCTOR, the name parameter is ignored and the return type of the lookup descriptor must be void. If kind corresponds to a virtual method invocation, the lookup type includes the method parameters but not the receiver type.

  Parameters:

  kind - The kind of method handle to be described

  owner - a ClassDesc describing the class containing the method, constructor, or field

  name - the unqualified name of the method or field (ignored if kind is CONSTRUCTOR)

  lookupDescriptor - a method descriptor string the lookup type, if the request is for a method invocation, or describing the invocation type, if the request is for a field or constructor

  Returns:

  the MethodHandleDesc

  Throws:

  NullPointerException - if any of the non-ignored arguments are null

  IllegalArgumentException - if the descriptor string is not a valid method or field descriptor

  See Java Virtual Machine Specification:

  4.4.8 The CONSTANT_MethodHandle_info Structure
  4.2.2 Unqualified Names
  4.3.2 Field Descriptors
  4.3.3 Method Descriptors
  

• ofMethod

  static DirectMethodHandleDesc ofMethod(DirectMethodHandleDesc.Kind kind, ClassDesc owner, String name, MethodTypeDesc lookupMethodType)

  Creates a MethodHandleDesc corresponding to an invocation of a declared method or constructor.

  The lookup descriptor string has the same format as for the lookup methods on MethodHandles.Lookup. If kind is CONSTRUCTOR, the name is ignored and the return type of the lookup type must be void. If kind corresponds to a virtual method invocation, the lookup type includes the method parameters but not the receiver type.

  Parameters:

  kind - The kind of method handle to be described; must be one of SPECIAL, VIRTUAL, STATIC, INTERFACE_SPECIAL, INTERFACE_VIRTUAL, INTERFACE_STATIC, CONSTRUCTOR

  owner - a ClassDesc describing the class containing the method or constructor

  name - the unqualified name of the method (ignored if kind is CONSTRUCTOR)

  lookupMethodType - a MethodTypeDesc describing the lookup type

  Returns:

  the MethodHandleDesc

  Throws:

  NullPointerException - if any non-ignored arguments are null

  IllegalArgumentException - if the name has the incorrect format, or the kind is invalid

  See Java Virtual Machine Specification:

  4.2.2 Unqualified Names
  

• ofField

  static DirectMethodHandleDesc ofField(DirectMethodHandleDesc.Kind kind, ClassDesc owner, String fieldName, ClassDesc fieldType)

  Creates a MethodHandleDesc corresponding to a method handle that accesses a field.

  Parameters:

  kind - the kind of the method handle to be described; must be one of GETTER, SETTER, STATIC_GETTER, or STATIC_SETTER

  owner - a ClassDesc describing the class containing the field

  fieldName - the unqualified name of the field

  fieldType - a ClassDesc describing the type of the field

  Returns:

  the MethodHandleDesc

  Throws:

  NullPointerException - if any of the arguments are null

  IllegalArgumentException - if the kind is not one of the valid values or if the field name is not valid

  See Java Virtual Machine Specification:

  4.2.2 Unqualified Names
  

• ofConstructor

  static DirectMethodHandleDesc ofConstructor(ClassDesc owner, ClassDesc... paramTypes)

  Returns a MethodHandleDesc corresponding to invocation of a constructor

  Parameters:

  owner - a ClassDesc describing the class containing the constructor

  paramTypes - ClassDescs describing the parameter types of the constructor

  Returns:

  the MethodHandleDesc

  Throws:

  NullPointerException - if any argument or its contents is null

• asType

  default MethodHandleDesc asType(MethodTypeDesc type)

  Returns a MethodHandleDesc that describes this method handle adapted to a different type, as if by MethodHandle.asType(MethodType).

  Parameters:

  type - a MethodHandleDesc describing the new method type

  Returns:

  a MethodHandleDesc for the adapted method handle

  Throws:

  NullPointerException - if the argument is null

• invocationType

  MethodTypeDesc invocationType()

  Returns a MethodTypeDesc describing the invocation type of the method handle described by this nominal descriptor. The invocation type describes the full set of stack values that are consumed by the invocation (including the receiver, if any).

  Returns:

  a MethodHandleDesc describing the method handle type

• resolveConstantDesc

  MethodHandle resolveConstantDesc(MethodHandles.Lookup lookup) throws ReflectiveOperationException

  Description copied from interface: ConstantDesc

  Resolves this descriptor reflectively, emulating the resolution behavior of JVMS 5.4.3 and the access control behavior of JVMS 5.4.4. The resolution and access control context is provided by the MethodHandles.Lookup parameter. No caching of the resulting value is performed.

  Specified by:

  resolveConstantDesc in interface ConstantDesc

  Parameters:

  lookup - The MethodHandles.Lookup to provide name resolution and access control context

  Returns:

  the resolved constant value

  Throws:

  ReflectiveOperationException - if a class, method, or field could not be reflectively resolved in the course of resolution

• equals

  boolean equals(Object o)

  Compares the specified object with this descriptor for equality. Returns true if and only if the specified object is also a MethodHandleDesc, and both encode the same nominal description of a method handle.

  Overrides:

  equals in class Object

  Parameters:

  o - the other object

  Returns:

  whether this descriptor is equal to the other object

  See Also:

  • Object.hashCode()
  • HashMap