EDU.purdue.cs.bloat.reflect
Class Constant

java.lang.Object
  |
  +--EDU.purdue.cs.bloat.reflect.Constant

public final class Constant

extends java.lang.Object

A Constant is used to represent an item in the constant pool of a class.

Field Summary

static byte	CLASS Constant tag for class types.
static byte	DOUBLE Constant tag for double constants.
static byte	FIELD_REF Constant tag for field references.
static byte	FLOAT Constant tag for float constants.
static byte	INTEGER Constant tag for int, short, byte, char, and boolean constants.
static byte	INTERFACE_METHOD_REF Constant tag for method references.
static byte	LONG Constant tag for long constants.
static byte	METHOD_REF Constant tag for method references.
static byte	NAME_AND_TYPE Constant tag for holding the name and type of a field or method.
static byte	STRING Constant tag for java.lang.String constants.
static byte	UTF8 Constant tag for holding the a UTF8 format string.

Constructor Summary

Constant(int tag, java.lang.Object value)

Method Summary

boolean	equals(java.lang.Object other) Check if an object is equal to this constant.
int	hashCode() Hash the constant.
int	tag() Get the tag of the constant.
java.lang.String	toString() Convert the constant to a string.
java.lang.Object	value() Get the value of the constant.

Methods inherited from class java.lang.Object

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

Field Detail

CLASS

public static final byte CLASS

Constant tag for class types. This is used to reference other classes, such as the superclass, and is used by the checkcast and instanceof instructions. The Fieldref, Methodref and InterfaceMethodref constant types refer to this constant type.

FIELD_REF

public static final byte FIELD_REF

Constant tag for field references. This is used to reference a field in (possibly) another class. The getfield, putfield, getstatic, and putstatic instructions use this constant type.

METHOD_REF

public static final byte METHOD_REF

Constant tag for method references. This is used to reference a method in (possibly) another class. The invokevirtual, invokespecial, and invokestatic instructions use this constant type.

STRING

public static final byte STRING

Constant tag for java.lang.String constants. The actual string value is stored indirectly in a Utf8 constant.

INTEGER

public static final byte INTEGER

Constant tag for int, short, byte, char, and boolean constants.

FLOAT

public static final byte FLOAT

Constant tag for float constants.

LONG

public static final byte LONG

Constant tag for long constants.

DOUBLE

public static final byte DOUBLE

Constant tag for double constants.

INTERFACE_METHOD_REF

public static final byte INTERFACE_METHOD_REF

Constant tag for method references. This is used to reference a method in an interface. The invokeinterface instruction uses this constant type.

NAME_AND_TYPE

public static final byte NAME_AND_TYPE

Constant tag for holding the name and type of a field or method. The Fieldref, Methodref and InterfaceMethodref constant types refer to this constant type.

UTF8

public static final byte UTF8

Constant tag for holding the a UTF8 format string. The string is used to hold the name and type descriptor for NameandType constants, the class name for Class constants, the string value for String constants.

Constructor Detail

Constant

public Constant(int tag,
                java.lang.Object value)

Parameters:

tag - The constant's tag.

value - The constant's value.

Method Detail

tag

public final int tag()

Get the tag of the constant.

Returns:

The tag.

value

public final java.lang.Object value()

Get the value of the constant.

Returns:

The value.

hashCode

public int hashCode()

Hash the constant.

Overrides:

hashCode in class java.lang.Object

Returns:

The hash code.

equals

public boolean equals(java.lang.Object other)

Check if an object is equal to this constant.

Overrides:

equals in class java.lang.Object

Parameters:

obj - The object to compare against.

Returns:

true if equal, false if not.

toString

public java.lang.String toString()

Convert the constant to a string.

Overrides:

toString in class java.lang.Object

Returns:

A string representation of the constant.