bsh

Class Primitive

public class Primitive extends Object implements ParserConstants, Serializable

Wrapper for primitive types in Bsh. This is package public because it is used in the implementation of some bsh commands. See the note in LHS.java about wrapping objects.

Field Summary
static Primitive	NULL
static Primitive	VOID VOID means "no type".

Constructor Summary
	Primitive(Number number)
	Primitive(Boolean value)
	Primitive(Byte value)
	Primitive(Short value)
	Primitive(Character value)
	Primitive(Integer value)
	Primitive(Long value)
	Primitive(Float value)
	Primitive(Double value)
	Primitive(boolean value)
	Primitive(byte value)
	Primitive(short value)
	Primitive(char value)
	Primitive(int value)
	Primitive(long value)
	Primitive(float value)
	Primitive(double value)

Method Summary
static Object	binaryOperation(Object obj1, Object obj2, int kind) Perform a binary operation on two Primitives or wrapper types.
boolean	booleanValue()
boolean	equals(Object obj) Primitives compare equal with other Primitives containing an equal wrapped value.
static Primitive	getDefaultValue(Class type) Get the appropriate default value per JLS 4.5.4
Class	getType() Get the corresponding primitive TYPE class for the Primitive
Object	getValue() Return the primitive value stored in its java.lang wrapper class
int	hashCode() The hash of the Primitive is tied to the hash of the wrapped value but shifted so that they are not the same.
int	intValue()
boolean	isNumber() Determine if this primitive is a numeric type. i.e. not boolean, null, or void (but including char)
Number	numberValue()
String	toString()
static Primitive	unaryOperation(Primitive val, int kind)
static Object	unwrap(Object obj) Unwrap primitive values and map voids to nulls.

Field Detail

VOID

public static final Primitive VOID

VOID means "no type". Strictly speaking, this makes no sense here. But for practical reasons we'll consider the lack of a type to be a special value.

Constructor Detail

Method Detail

binaryOperation

public static Object binaryOperation(Object obj1, Object obj2, int kind)

Perform a binary operation on two Primitives or wrapper types. If both original args were Primitives return a Primitive result else it was mixed (wrapper/primitive) return the wrapper type. The exception is for boolean operations where we will return the primitive type eithe way.

booleanValue

public boolean booleanValue()

equals

public boolean equals(Object obj)

Primitives compare equal with other Primitives containing an equal wrapped value.

getDefaultValue

public static Primitive getDefaultValue(Class type)

Get the appropriate default value per JLS 4.5.4

getType

public Class getType()

Get the corresponding primitive TYPE class for the Primitive

Returns: the primitive TYPE class type of the value or Void.TYPE for Primitive.VOID or null value for type of Primitive.NULL

Parameters: obj object type which may be bsh.Primitive

Returns: corresponding "normal" Java type, "unwrapping" any bsh.Primitive types to their wrapper types.

B) 2000 pat@pat.net :-)