Descriptor (Janino 3.0.1)

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 Summary

Fields
Modifier and Type	Field and Description
`static String`	`BOOLEAN` The field descriptor for the primitive type BOOLEAN.
`static String`	`BYTE` The field descriptor for the primitive type BYTE.
`static String`	`CHAR` The field descriptor for the primitive type CHAR.
`static String`	`DOUBLE` The field descriptor for the primitive type DOUBLE.
`static String`	`FLOAT` The field descriptor for the primitive type FLOAT.
`static String`	`INT` The field descriptor for the primitive type INT.
`static String`	`JAVA_IO_SERIALIZABLE` The field descriptor for the interface `Serializable`.
`static String`	`JAVA_LANG_ANNOTATION_RETENTION` The field descriptor for the annotation `Retention`.
`static String`	`JAVA_LANG_ASSERTIONERROR` The field descriptor for the class `AssertionError`.
`static String`	`JAVA_LANG_BOOLEAN` The field descriptor for the class `Boolean`.
`static String`	`JAVA_LANG_BYTE` The field descriptor for the class `Byte`.
`static String`	`JAVA_LANG_CHARACTER` The field descriptor for the class `Character`.
`static String`	`JAVA_LANG_CLASS` The field descriptor for the class `Class`.
`static String`	`JAVA_LANG_CLONEABLE` The field descriptor for the interface `Cloneable`.
`static String`	`JAVA_LANG_DOUBLE` The field descriptor for the class `Double`.
`static String`	`JAVA_LANG_ENUM` The field descriptor for the class `Enum`.
`static String`	`JAVA_LANG_ERROR` The field descriptor for the class `Error`.
`static String`	`JAVA_LANG_EXCEPTION` The field descriptor for the class `Exception`.
`static String`	`JAVA_LANG_FLOAT` The field descriptor for the class `Float`.
`static String`	`JAVA_LANG_INTEGER` The field descriptor for the class `Integer`.
`static String`	`JAVA_LANG_ITERABLE` The field descriptor for the interface `Iterable`.
`static String`	`JAVA_LANG_LONG` The field descriptor for the class `Long`.
`static String`	`JAVA_LANG_OBJECT` The field descriptor for the class `Object`.
`static String`	`JAVA_LANG_OVERRIDE` The field descriptor for the annotation `Override`.
`static String`	`JAVA_LANG_RUNTIMEEXCEPTION` The field descriptor for the class `RuntimeException`.
`static String`	`JAVA_LANG_SHORT` The field descriptor for the class `Short`.
`static String`	`JAVA_LANG_STRING` The field descriptor for the class `String`.
`static String`	`JAVA_LANG_STRINGBUILDER` The field descriptor for the class `StringBuilder`.
`static String`	`JAVA_LANG_SYSTEM` The field descriptor for the class `System`.
`static String`	`JAVA_LANG_THROWABLE` The field descriptor for the class `Throwable`.
`static String`	`JAVA_UTIL_ITERATOR` The field descriptor for the interface `Iterator`.
`static String`	`LONG` The field descriptor for the primitive type LONG.
`static String`	`SHORT` The field descriptor for the primitive type SHORT.
`static String`	`VOID` The field descriptor for the type `void`.

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method and Description
`static boolean`	`areInSamePackage(String d1, String d2)` Checks whether two reference types are declared in the same package.
`static String`	`fromClassName(String className)` Converts a class name as defined by "Class.getName()" into a descriptor.
`static String`	`fromInternalForm(String internalForm)` Converts a class name in the "internal form" as described in JVMS 4.2 into a descriptor.
`static String`	`getComponentDescriptor(String d)`
`static String`	`getPackageName(String d)` Returns the package name of a class or interface reference descriptor, or `null` iff the class or interface is declared in the default package.
`static boolean`	`hasSize1(String d)`
`static boolean`	`hasSize2(String d)`
`static boolean`	`isArrayReference(String d)`
`static boolean`	`isClassOrInterfaceReference(String d)`
`static boolean`	`isPrimitive(String d)`
`static boolean`	`isPrimitiveNumeric(String d)`
`static boolean`	`isReference(String d)`
`static short`	`size(String d)`
`static String`	`toClassName(String d)` Converts a field descriptor into a class name as defined by `Class.getName()`.
`static String`	`toInternalForm(String d)` Converts a descriptor into the "internal form" as defined by JVMS 4.2.
`static String`	`toString(String d)` Pretty-prints the given descriptor.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - VOID
```
public static final String VOID
```
    The field descriptor for the type void.
    
    See Also:
    
    Constant Field Values
  - BYTE
```
public static final String BYTE
```
    The field descriptor for the primitive type BYTE.
    
    See Also:
    
    Constant Field Values
  - CHAR
```
public static final String CHAR
```
    The field descriptor for the primitive type CHAR.
    
    See Also:
    
    Constant Field Values
  - DOUBLE
```
public static final String DOUBLE
```
    The field descriptor for the primitive type DOUBLE.
    
    See Also:
    
    Constant Field Values
  - FLOAT
```
public static final String FLOAT
```
    The field descriptor for the primitive type FLOAT.
    
    See Also:
    
    Constant Field Values
  - INT
```
public static final String INT
```
    The field descriptor for the primitive type INT.
    
    See Also:
    
    Constant Field Values
  - LONG
```
public static final String LONG
```
    The field descriptor for the primitive type LONG.
    
    See Also:
    
    Constant Field Values
  - SHORT
```
public static final String SHORT
```
    The field descriptor for the primitive type SHORT.
    
    See Also:
    
    Constant Field Values
  - BOOLEAN
```
public static final String BOOLEAN
```
    The field descriptor for the primitive type BOOLEAN.
    
    See Also:
    
    Constant Field Values
  - JAVA_LANG_ANNOTATION_RETENTION
```
public static final String JAVA_LANG_ANNOTATION_RETENTION
```
    The field descriptor for the annotation Retention.
    
    See Also:
    
    Constant Field Values
  - JAVA_LANG_OVERRIDE
```
public static final String JAVA_LANG_OVERRIDE
```
    The field descriptor for the annotation Override.
    
    See Also:
    
    Constant Field Values
  - JAVA_LANG_ASSERTIONERROR
```
public static final String JAVA_LANG_ASSERTIONERROR
```
    The field descriptor for the class AssertionError.
    
    See Also:
    
    Constant Field Values
  - JAVA_LANG_BOOLEAN
```
public static final String JAVA_LANG_BOOLEAN
```
    The field descriptor for the class Boolean.
    
    See Also:
    
    Constant Field Values
  - JAVA_LANG_BYTE
```
public static final String JAVA_LANG_BYTE
```
    The field descriptor for the class Byte.
    
    See Also:
    
    Constant Field Values
  - JAVA_LANG_CHARACTER
```
public static final String JAVA_LANG_CHARACTER
```
    The field descriptor for the class Character.
    
    See Also:
    
    Constant Field Values
  - JAVA_LANG_CLASS
```
public static final String JAVA_LANG_CLASS
```
    The field descriptor for the class Class.
    
    See Also:
    
    Constant Field Values
  - JAVA_LANG_DOUBLE
```
public static final String JAVA_LANG_DOUBLE
```
    The field descriptor for the class Double.
    
    See Also:
    
    Constant Field Values
  - JAVA_LANG_ENUM
```
public static final String JAVA_LANG_ENUM
```
    The field descriptor for the class Enum.
    
    See Also:
    
    Constant Field Values
  - JAVA_LANG_ERROR
```
public static final String JAVA_LANG_ERROR
```
    The field descriptor for the class Error.
    
    See Also:
    
    Constant Field Values
  - JAVA_LANG_EXCEPTION
```
public static final String JAVA_LANG_EXCEPTION
```
    The field descriptor for the class Exception.
    
    See Also:
    
    Constant Field Values
  - JAVA_LANG_FLOAT
```
public static final String JAVA_LANG_FLOAT
```
    The field descriptor for the class Float.
    
    See Also:
    
    Constant Field Values
  - JAVA_LANG_INTEGER
```
public static final String JAVA_LANG_INTEGER
```
    The field descriptor for the class Integer.
    
    See Also:
    
    Constant Field Values
  - JAVA_LANG_LONG
```
public static final String JAVA_LANG_LONG
```
    The field descriptor for the class Long.
    
    See Also:
    
    Constant Field Values
  - JAVA_LANG_OBJECT
```
public static final String JAVA_LANG_OBJECT
```
    The field descriptor for the class Object.
    
    See Also:
    
    Constant Field Values
  - JAVA_LANG_RUNTIMEEXCEPTION
```
public static final String JAVA_LANG_RUNTIMEEXCEPTION
```
    The field descriptor for the class RuntimeException.
    
    See Also:
    
    Constant Field Values
  - JAVA_LANG_SHORT
```
public static final String JAVA_LANG_SHORT
```
    The field descriptor for the class Short.
    
    See Also:
    
    Constant Field Values
  - JAVA_LANG_STRING
```
public static final String JAVA_LANG_STRING
```
    The field descriptor for the class String.
    
    See Also:
    
    Constant Field Values
  - JAVA_LANG_STRINGBUILDER
```
public static final String JAVA_LANG_STRINGBUILDER
```
    The field descriptor for the class StringBuilder.
    
    See Also:
    
    Constant Field Values
  - JAVA_LANG_SYSTEM
```
public static final String JAVA_LANG_SYSTEM
```
    The field descriptor for the class System.
    
    See Also:
    
    Constant Field Values
  - JAVA_LANG_THROWABLE
```
public static final String JAVA_LANG_THROWABLE
```
    The field descriptor for the class Throwable.
    
    See Also:
    
    Constant Field Values
  - JAVA_IO_SERIALIZABLE
```
public static final String JAVA_IO_SERIALIZABLE
```
    The field descriptor for the interface Serializable.
    
    See Also:
    
    Constant Field Values
  - JAVA_LANG_CLONEABLE
```
public static final String JAVA_LANG_CLONEABLE
```
    The field descriptor for the interface Cloneable.
    
    See Also:
    
    Constant Field Values
  - JAVA_LANG_ITERABLE
```
public static final String JAVA_LANG_ITERABLE
```
    The field descriptor for the interface Iterable.
    
    See Also:
    
    Constant Field Values
  - JAVA_UTIL_ITERATOR
```
public static final String JAVA_UTIL_ITERATOR
```
    The field descriptor for the interface Iterator.
    
    See Also:
    
    Constant Field Values
- 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)
```
    Converts a class name in the "internal form" as described in JVMS 4.2 into a descriptor.
    Also implements 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
```
@Nullable
public static String getPackageName(String d)
```
    Returns the package name of a class or interface reference descriptor, or null iff 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.

Class Descriptor

Field Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

VOID

BYTE

CHAR

DOUBLE

FLOAT

INT

LONG

SHORT

BOOLEAN

JAVA_LANG_ANNOTATION_RETENTION

JAVA_LANG_OVERRIDE

JAVA_LANG_ASSERTIONERROR

JAVA_LANG_BOOLEAN

JAVA_LANG_BYTE

JAVA_LANG_CHARACTER

JAVA_LANG_CLASS

JAVA_LANG_DOUBLE

JAVA_LANG_ENUM

JAVA_LANG_ERROR

JAVA_LANG_EXCEPTION

JAVA_LANG_FLOAT

JAVA_LANG_INTEGER

JAVA_LANG_LONG

JAVA_LANG_OBJECT

JAVA_LANG_RUNTIMEEXCEPTION

JAVA_LANG_SHORT

JAVA_LANG_STRING

JAVA_LANG_STRINGBUILDER

JAVA_LANG_SYSTEM

JAVA_LANG_THROWABLE

JAVA_IO_SERIALIZABLE

JAVA_LANG_CLONEABLE

JAVA_LANG_ITERABLE

JAVA_UTIL_ITERATOR

Method Detail

isReference

isClassOrInterfaceReference

isArrayReference

getComponentDescriptor

size

hasSize1

hasSize2

toString

fromClassName

fromInternalForm

toClassName

toInternalForm

isPrimitive

isPrimitiveNumeric

getPackageName

areInSamePackage