bsh
Class Primitive

java.lang.Object
  |
  +--bsh.Primitive

All Implemented Interfaces:

ParserConstants, java.io.Serializable

public class Primitive

extends java.lang.Object

implements ParserConstants, java.io.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.

See Also:

Serialized Form

Field Summary

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

Fields inherited from interface bsh.ParserConstants

_DEFAULT, ABSTRACT, ANDASSIGN, ANDASSIGNX, ASSIGN, BANG, BIT_AND, BIT_ANDX, BIT_OR, BIT_ORX, BOOL_AND, BOOL_ANDX, BOOL_OR, BOOL_ORX, BOOLEAN, BREAK, BYTE, CASE, CATCH, CHAR, CHARACTER_LITERAL, CLASS, COLON, COMMA, CONST, CONTINUE, DECIMAL_LITERAL, DECR, DEFAULT, DIGIT, DO, DOT, DOUBLE, ELSE, EOF, EQ, EXPONENT, FALSE, FINAL, FINALLY, FLOAT, FLOATING_POINT_LITERAL, FOR, FORMAL_COMMENT, GE, GEX, GOTO, GT, GTX, HASH_BANG_COMMENT, HEX_LITERAL, HOOK, IDENTIFIER, IF, IMPORT, INCR, INSTANCEOF, INT, INTEGER_LITERAL, INTERFACE, LBRACE, LBRACKET, LE, LETTER, LEX, LONG, LPAREN, LSHIFT, LSHIFTASSIGN, LSHIFTASSIGNX, LSHIFTX, LT, LTX, MINUS, MINUSASSIGN, MOD, MODASSIGN, MULTI_LINE_COMMENT, NATIVE, NE, NEW, NONPRINTABLE, OCTAL_LITERAL, ORASSIGN, ORASSIGNX, PLUS, PLUSASSIGN, PRIVATE, PROTECTED, PUBLIC, RBRACE, RBRACKET, RETURN, RPAREN, RSIGNEDSHIFT, RSIGNEDSHIFTASSIGN, RSIGNEDSHIFTASSIGNX, RSIGNEDSHIFTX, RUNSIGNEDSHIFT, RUNSIGNEDSHIFTASSIGN, RUNSIGNEDSHIFTASSIGNX, RUNSIGNEDSHIFTX, SEMICOLON, SHORT, SINGLE_LINE_COMMENT, SLASH, SLASHASSIGN, STAR, STARASSIGN, STATIC, STRING_LITERAL, SWITCH, SYNCHRONIZED, THROW, THROWS, TILDE, tokenImage, TRANSIENT, TRUE, TRY, VOLATILE, WHILE, XOR, XORASSIGN

Constructor Summary

Primitive(boolean value)

Primitive(java.lang.Boolean value)

Primitive(byte value)

Primitive(java.lang.Byte value)

Primitive(char value)

Primitive(java.lang.Character value)

Primitive(double value)

Primitive(java.lang.Double value)

Primitive(float value)

Primitive(java.lang.Float value)

Primitive(int value)

Primitive(java.lang.Integer value)

Primitive(long value)

Primitive(java.lang.Long value)

Primitive(java.lang.Number number)

Primitive(short value)

Primitive(java.lang.Short value)

Method Summary

static java.lang.Object	binaryOperation(java.lang.Object obj1, java.lang.Object obj2, int kind) Perform a binary operation on two Primitives or wrapper types.
boolean	booleanValue()
boolean	equals(java.lang.Object obj) Primitives compare equal with other Primitives containing an equal wrapped value.
static Primitive	getDefaultValue(java.lang.Class type) Get the appropriate default value per JLS 4.5.4
java.lang.Class	getType() Get the corresponding primitive TYPE class for the Primitive
java.lang.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.
java.lang.Number	numberValue()
java.lang.String	toString()
static Primitive	unaryOperation(Primitive val, int kind)
static java.lang.Object	unwrap(java.lang.Object obj) Unwrap primitive values and map voids to nulls.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

NULL

public static final Primitive NULL

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

Primitive

public Primitive(java.lang.Number number)

Primitive

public Primitive(java.lang.Boolean value)

Primitive

public Primitive(java.lang.Byte value)

Primitive

public Primitive(java.lang.Short value)

Primitive

public Primitive(java.lang.Character value)

Primitive

public Primitive(java.lang.Integer value)

Primitive

public Primitive(java.lang.Long value)

Primitive

public Primitive(java.lang.Float value)

Primitive

public Primitive(java.lang.Double value)

Primitive

public Primitive(boolean value)

Primitive

public Primitive(byte value)

Primitive

public Primitive(short value)

Primitive

public Primitive(char value)

Primitive

public Primitive(int value)

Primitive

public Primitive(long value)

Primitive

public Primitive(float value)

Primitive

public Primitive(double value)

Method Detail

getValue

public java.lang.Object getValue()

Return the primitive value stored in its java.lang wrapper class

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

getType

public java.lang.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

binaryOperation

public static java.lang.Object binaryOperation(java.lang.Object obj1,
                                               java.lang.Object obj2,
                                               int kind)
                                        throws UtilEvalError

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.

UtilEvalError

unaryOperation

public static Primitive unaryOperation(Primitive val,
                                       int kind)
                                throws UtilEvalError

UtilEvalError

intValue

public int intValue()
             throws UtilEvalError

UtilEvalError

booleanValue

public boolean booleanValue()
                     throws UtilEvalError

UtilEvalError

isNumber

public boolean isNumber()

Determine if this primitive is a numeric type. i.e. not boolean, null, or void (but including char)

numberValue

public java.lang.Number numberValue()
                             throws UtilEvalError

UtilEvalError

equals

public boolean equals(java.lang.Object obj)

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

Overrides:

equals in class java.lang.Object

hashCode

public 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.

Overrides:

hashCode in class java.lang.Object

unwrap

public static java.lang.Object unwrap(java.lang.Object obj)

Unwrap primitive values and map voids to nulls. Normal (non Primitive) types remain unchanged.

Parameters:

obj - object type which may be bsh.Primitive

Returns:

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

getDefaultValue

public static Primitive getDefaultValue(java.lang.Class type)

Get the appropriate default value per JLS 4.5.4