Package org.codehaus.janino

Class Descriptor

java.lang.Object
org.codehaus.janino.Descriptor
public final class Descriptor extends Object
Helper class that defines useful methods for handling "field descriptors" (JVMS 4.3.2) and "method descriptors" (JVMS 4.3.3).

Typical descriptors are:

  • I Integer
  • [I Array of integer
  • Lpkg1/pkg2/Cls; Class
  • Lpkg1/pkg2/Outer$Inner; Member class

  • Field Details

  • Method Details

    • isReference

      public static boolean isReference(String d)
      Returns:
      Whether this Descriptor describes a reference (i.e. non-primitive) type

    • isClassOrInterfaceReference

      public static boolean isClassOrInterfaceReference(String d)
      Returns:
      Whether this Descriptor describes a class or an interface (and not an array or a primitive type)

    • isArrayReference

      public static boolean isArrayReference(String d)
      Returns:
      Whether this Descriptor describes an array type

    • getComponentDescriptor

      public static String getComponentDescriptor(String d)
      Returns:
      The descriptor of the component of the array type d
      Throws:
      JaninoRuntimeException - d does not describe an array type

    • size

      public static short size(String d)
      Returns:
      The number of slots (1 or two) that a value of the type described by d occupies on the operand stack or in the local variable array, or 0 iff d describes the type VOID

    • hasSize1

      public static boolean hasSize1(String d)
      Returns:
      true iff d describes a primitive type except LONG and DOUBLE, or a reference type

    • hasSize2

      public static boolean hasSize2(String d)
      Returns:
      true iff d LONG or DOUBLE

    • toString

      public static String toString(String d)
      Pretty-prints the given descriptor.
      Parameters:
      d - A valid field or method descriptor

    • fromClassName

      public static String fromClassName(String className)
      Convert a class name as defined by "Class.getName()" into a descriptor.

    • fromInternalForm

      public static String fromInternalForm(String internalForm)
      Convert a class name in the "internal form" as described in JVMS 4.2 into a descriptor.

      Also implement the encoding of array types as described in JVMS 4.4.1.

    • toClassName

      public static String toClassName(String d)
      Convert a field descriptor into a class name as defined by Class.getName().

    • toInternalForm

      public static String toInternalForm(String d)
      Convert a descriptor into the "internal form" as defined by JVMS 4.2.

    • isPrimitive

      public static boolean isPrimitive(String d)
      Returns:
      Whether d describes a primitive type or VOID

    • isPrimitiveNumeric

      public static boolean isPrimitiveNumeric(String d)
      Returns:
      Whether d describes a primitive type except BOOLEAN and VOID

    • getPackageName

      public static String getPackageName(String d)
      Returns the package name of a class or interface reference descriptor, or null if the class or interface is declared in the default package.

    • areInSamePackage

      public static boolean areInSamePackage(String d1, String d2)
      Check whether two reference types are declared in the same package.