jess
Class RU

java.lang.Object
  |
  +--jess.RU

All Implemented Interfaces:

java.io.Serializable

public class RU

extends java.lang.Object

implements java.io.Serializable

General utilities for Jess. All fields and methods in this class are static, and there is no constructor.

(C) 1997 Ernest J. Friedman-Hill and Sandia National Laboratories

Author:

Ernest J. Friedman-Hill

See Also:

Serialized Form

Field Summary

static int	ATOM Data type of atom
static int	BINDING Data type of variable binding stored in value (internal use)
static int	DT_DATA_TYPE Relative index of slot data type within a deftemplate's slots
static int	DT_DFLT_DATA Relative index of slot default value within a deftemplate's slots
static int	DT_SLOT_NAME Relative index of slot name within a deftemplate's slots
static int	DT_SLOT_SIZE Size of a slot in a deftemplate
static int	EXTERNAL_ADDRESS Data type of external address
static int	FACT Data type of a fact id
static int	FLOAT Data type of float
static int	FUNCALL Data type of function call stored in a value
static int	INTEGER Data type of integer
static int	LIST Data type of a list stored in a value
static int	LONG Data type of Java long
static int	MULTISLOT Data type of multislot name stored in a value
static int	MULTIVARIABLE Data type of multivariable
static int	NONE Data type of "no value"
static int	SLOT Data type of slot name stored in a value
static int	STRING Data type of string
static int	VARIABLE Data type of a variable

Method Summary

static java.lang.String	gensym(java.lang.String prefix) Generate a pseudo-unique symbol starting with "prefix"
static java.lang.String	getProperty(java.lang.String prop) Get a property, but return null on SecurityException
static java.lang.String	getTypeName(int type) Given a type constant (ATOM, STRING, INTEGER, etc.) return a String version of the name of that type ("ATOM", "STRING", "INTEGER", etc.)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

DT_SLOT_NAME

public static final int DT_SLOT_NAME

Relative index of slot name within a deftemplate's slots

DT_DFLT_DATA

public static final int DT_DFLT_DATA

Relative index of slot default value within a deftemplate's slots

DT_DATA_TYPE

public static final int DT_DATA_TYPE

Relative index of slot data type within a deftemplate's slots

DT_SLOT_SIZE

public static final int DT_SLOT_SIZE

Size of a slot in a deftemplate

NONE

public static final int NONE

Data type of "no value"

ATOM

public static final int ATOM

Data type of atom

STRING

public static final int STRING

Data type of string

INTEGER

public static final int INTEGER

Data type of integer

VARIABLE

public static final int VARIABLE

Data type of a variable

FACT

public static final int FACT

Data type of a fact id

FLOAT

public static final int FLOAT

Data type of float

FUNCALL

public static final int FUNCALL

Data type of function call stored in a value

LIST

public static final int LIST

Data type of a list stored in a value

EXTERNAL_ADDRESS

public static final int EXTERNAL_ADDRESS

Data type of external address

BINDING

public static final int BINDING

Data type of variable binding stored in value (internal use)

MULTIVARIABLE

public static final int MULTIVARIABLE

Data type of multivariable

SLOT

public static final int SLOT

Data type of slot name stored in a value

MULTISLOT

public static final int MULTISLOT

Data type of multislot name stored in a value

LONG

public static final int LONG

Data type of Java long

Method Detail

getTypeName

public static java.lang.String getTypeName(int type)

Given a type constant (ATOM, STRING, INTEGER, etc.) return a String version of the name of that type ("ATOM", "STRING", "INTEGER", etc.)

Parameters:

type - One of the type constants in this class

Returns:

The String name of this type, or null if the constant is out of range.

gensym

public static java.lang.String gensym(java.lang.String prefix)

Generate a pseudo-unique symbol starting with "prefix"

Parameters:

prefix - The alphabetic part of the symbol

Returns:

The new symbol

getProperty

public static java.lang.String getProperty(java.lang.String prop)

Get a property, but return null on SecurityException

Parameters:

prop - The property name to get

Returns:

The value of the property, or null if none or security problem