Nested Class Summary

Method Summary

Method Details

• of

  static ClassDesc of(String name)

  Returns aClassDesc for a class or interface type,given the name of the class or interface, such as"java.lang.String".(To create a descriptor for an array type, either useofDescriptor(String)orarrayType(); to create a descriptor for a primitive type, useofDescriptor(String) or use the predefined constants inConstantDescs).

  Parameters:

  name - the fully qualified (dot-separated) binary class name

  Returns:

  aClassDesc describing the desired class

  Throws:

  NullPointerException - if the argument isnull

  IllegalArgumentException - if the name string is not in thecorrect format

  See Also:

  • ofDescriptor(String)
  • ofInternalName(String)

• ofInternalName

  static ClassDesc ofInternalName(String name)

  Returns aClassDesc for a class or interface type,given the name of the class or interface in internal form,such as"java/lang/String".

  API Note:

  To create a descriptor for an array type, either useofDescriptor(String)orarrayType(); to create a descriptor for a primitive type, useofDescriptor(String) or use the predefined constants inConstantDescs.

  Parameters:

  name - the fully qualified class name, in internal (slash-separated) form

  Returns:

  aClassDesc describing the desired class

  Throws:

  NullPointerException - if the argument isnull

  IllegalArgumentException - if the name string is not in thecorrect format

  SeeJava Virtual Machine Specification:

  4.2.1 Binary Class and Interface Names
  

  Since:

  20

  See Also:

  • of(String)
  • ofDescriptor(String)

• of

  static ClassDesc of(String packageName,String className)

  Returns aClassDesc for a class or interface type,given a package name and the unqualified (simple) name for theclass or interface.

  Parameters:

  packageName - the package name (dot-separated); if the package name is the empty string, the class is considered to be in the unnamed package

  className - the unqualified (simple) class name

  Returns:

  aClassDesc describing the desired class

  Throws:

  NullPointerException - if any argument isnull

  IllegalArgumentException - if the package name or class name arenot in the correct format

• ofDescriptor

  static ClassDesc ofDescriptor(String descriptor)

  Returns aClassDesc given a descriptor string for a class,interface, array, or primitive type.

  API Note:

  A field type descriptor string for a non-array type is eithera one-letter code corresponding to a primitive type("J", "I", "C", "S", "B", "D", "F", "Z", "V"), or the letter"L", followedby the fully qualified binary name of a class, followed by";".A field type descriptor for an array type is the character"["followed by the field descriptor for the component type. Examples ofvalid type descriptor strings include"Ljava/lang/String;","I","[I","V","[Ljava/lang/String;", etc.See JVMS4.3.2("Field Descriptors") for more detail.

  Parameters:

  descriptor - a field descriptor string

  Returns:

  aClassDesc describing the desired class

  Throws:

  NullPointerException - if the argument isnull

  IllegalArgumentException - if the descriptor string is not in thecorrect format

  SeeJava Virtual Machine Specification:

  4.3.2 Field Descriptors
  4.4.1 The CONSTANT_Class_info Structure
  

  See Also:

  • of(String)
  • ofInternalName(String)

• arrayType

  ClassDesc arrayType()

  Returns aClassDesc for an array type whose component typeis described by thisClassDesc.

  Specified by:

  arrayType in interface TypeDescriptor.OfField<ClassDesc>

  Returns:

  aClassDesc describing the array type

  Throws:

  IllegalStateException - if the resultingClassDesc would have an array rank of greater than 255

  SeeJava Virtual Machine Specification:

  4.4.1 The CONSTANT_Class_info Structure
  

• arrayType

  ClassDesc arrayType(int rank)

  Returns aClassDesc for an array type of the specified rank,whose component type is described by thisClassDesc.

  Parameters:

  rank - the rank of the array

  Returns:

  aClassDesc describing the array type

  Throws:

  IllegalArgumentException - if the rank is less than orequal to zero or if the rank of the resulting array type isgreater than 255

  SeeJava Virtual Machine Specification:

  4.4.1 The CONSTANT_Class_info Structure
  

• nested

  default ClassDesc nested(String nestedName)

  Returns aClassDesc for a nested class of the class orinterface type described by thisClassDesc.

  API Note:

  Example: If descriptord describes the classjava.util.Map, adescriptor for the classjava.util.Map.Entry could be obtainedbyd.nested("Entry").

  Parameters:

  nestedName - the unqualified name of the nested class

  Returns:

  aClassDesc describing the nested class

  Throws:

  NullPointerException - if the argument isnull

  IllegalStateException - if thisClassDesc does notdescribe a class or interface type

  IllegalArgumentException - if the nested class name is invalid

• nested

  default ClassDesc nested(String firstNestedName,String... moreNestedNames)

  Returns aClassDesc for a nested class of the class orinterface type described by thisClassDesc.

  Parameters:

  firstNestedName - the unqualified name of the first level of nested class

  moreNestedNames - the unqualified name(s) of the remaining levels of nested class

  Returns:

  aClassDesc describing the nested class

  Throws:

  NullPointerException - if any argument or its contents isnull

  IllegalStateException - if thisClassDesc does notdescribe a class or interface type

  IllegalArgumentException - if the nested class name is invalid

• isArray

  default boolean isArray()

  Returns whether thisClassDesc describes an array type.

  Specified by:

  isArray in interface TypeDescriptor.OfField<ClassDesc>

  Returns:

  whether thisClassDesc describes an array type

• isPrimitive

  default boolean isPrimitive()

  Returns whether thisClassDesc describes a primitive type.

  Specified by:

  isPrimitive in interface TypeDescriptor.OfField<ClassDesc>

  Returns:

  whether thisClassDesc describes a primitive type

• isClassOrInterface

  default boolean isClassOrInterface()

  Returns whether thisClassDesc describes a class or interface type.

  Returns:

  whether thisClassDesc describes a class or interface type

• componentType

  default ClassDesc componentType()

  Returns the component type of thisClassDesc, if it describesan array type, ornull otherwise.

  Specified by:

  componentType in interface TypeDescriptor.OfField<ClassDesc>

  Returns:

  aClassDesc describing the component type, ornullif this descriptor does not describe an array type

• packageName

  default String packageName()

  Returns the package name of thisClassDesc, if it describesa class or interface type.

  Returns:

  the package name, or the empty string if the class is in thedefault package, or thisClassDesc does not describe a class or interface type

• displayName

  String displayName()

  Returns a human-readable name for thisClassDesc.For primitive types, this method returns the simple name (such asint).For class or interface types, this method returns the unqualified class name.For array types, this method returns the human-readable name of the componenttype suffixed with the appropriate number of[] pairs.

  Returns:

  a human-readable name for thisClassDesc

• descriptorString

  String descriptorString()

  Returns a field type descriptor string for this type

  Specified by:

  descriptorString in interface TypeDescriptor

  Returns:

  the descriptor string

  SeeJava Virtual Machine Specification:

  4.3.2 Field Descriptors
  

• resolveConstantDesc

  Class<?> resolveConstantDesc(MethodHandles.Lookup lookup) throwsReflectiveOperationException

  Description copied from interface: ConstantDesc

  Resolves this descriptor reflectively, emulating the resolution behaviorof JVMS5.4.3 and the access control behavior of JVMS5.4.4. The resolutionand access control context is provided by theMethodHandles.Lookupparameter. No caching of the resulting value is performed.

  Specified by:

  resolveConstantDesc in interface ConstantDesc

  Parameters:

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

  Returns:

  the resolved constant value

  Throws:

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

  Since:

  21

• equals

  boolean equals(Object o)

  Compare the specified object with this descriptor for equality. Returnstrue if and only if the specified object is also aClassDesc and both describe the same type.

  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