Package org.codehaus.janino

Class 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

    • Method Detail

      • 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)
        Converts 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)
        Converts a field descriptor into a class name as defined by Class.getName().

      • toInternalForm

        public static String toInternalForm​(String d)
        Converts 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)
        Checks whether two reference types are declared in the same package.