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

(C) 2006 Sandia National Laboratories

See Also:

Serialized Form

Field Summary

static int	ACCUM_RESULT Variable is an accumulate result
static int	AND Test is anded with previous
static int	ANY
static int	ATOM Deprecated. use SYMBOL instead
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 Deprecated. Since Jess 7, use JAVA_OBJECT instead.
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	GLOBAL Variable is global
static int	INTEGER Data type of integer
static int	JAVA_OBJECT Data type of arbitrary Java object
static int	LAMBDA Data type of a lambda expression
static int	LEXEME
static int	LIST Data type of a list stored in a value
static int	LOCAL Variable is local to a defrule or deffunction
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	NUMBER
static int	OR Test is ored with previous
static int	PATTERN Variable contains a fact index
static int	SLOT Data type of slot name stored in a value
static int	STRING Data type of string
static int	SYMBOL Data type of symbol
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 int	getTypeCode(java.lang.String typeName)
static java.lang.String	getTypeName(int type) Given a type constant (SYMBOL, STRING, INTEGER, etc.) return a String version of the name of that type ("SYMBOL", "STRING", "INTEGER", etc.)
static Value	objectToValue(java.lang.Class clazz, java.lang.Object obj) Create a Jess Value object out of a Java Object.
static java.lang.String	removePrefix(java.lang.String name)
static java.lang.String	tagName(int tag)
static java.lang.Object	valueToObject(java.lang.Class clazz, Value value, Context context) Return a Java object derived from the Value which matches the Class object as closely as possible.
static java.lang.Object	valueToObject(java.lang.Class clazz, Value value, Context context, boolean strict) Return a Java object derived from the Value which matches the Class object as closely as possible.

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

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Constant Field Values

DT_DFLT_DATA

public static final int DT_DFLT_DATA

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

See Also:

Constant Field Values

DT_DATA_TYPE

public static final int DT_DATA_TYPE

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

See Also:

Constant Field Values

DT_SLOT_SIZE

public static final int DT_SLOT_SIZE

Size of a slot in a deftemplate

See Also:

Constant Field Values

NONE

public static final int NONE

Data type of "no value"

See Also:

Constant Field Values

ATOM

public static final int ATOM

Deprecated. use SYMBOL instead

See Also:

Constant Field Values

SYMBOL

public static final int SYMBOL

Data type of symbol

See Also:

Constant Field Values

STRING

public static final int STRING

Data type of string

See Also:

Constant Field Values

INTEGER

public static final int INTEGER

Data type of integer

See Also:

Constant Field Values

VARIABLE

public static final int VARIABLE

Data type of a variable

See Also:

Constant Field Values

FACT

public static final int FACT

Data type of a fact id

See Also:

Constant Field Values

FLOAT

public static final int FLOAT

Data type of float

See Also:

Constant Field Values

FUNCALL

public static final int FUNCALL

Data type of function call stored in a value

See Also:

Constant Field Values

LIST

public static final int LIST

Data type of a list stored in a value

See Also:

Constant Field Values

JAVA_OBJECT

public static final int JAVA_OBJECT

Data type of arbitrary Java object

See Also:

Constant Field Values

LEXEME

public static final int LEXEME

See Also:

Constant Field Values

ANY

public static final int ANY

See Also:

Constant Field Values

EXTERNAL_ADDRESS

public static final int EXTERNAL_ADDRESS

Deprecated. Since Jess 7, use JAVA_OBJECT instead.

Data type of external address

See Also:

Constant Field Values

BINDING

public static final int BINDING

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

See Also:

Constant Field Values

MULTIVARIABLE

public static final int MULTIVARIABLE

Data type of multivariable

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Constant Field Values

SLOT

public static final int SLOT

Data type of slot name stored in a value

See Also:

Constant Field Values

MULTISLOT

public static final int MULTISLOT

Data type of multislot name stored in a value

See Also:

Constant Field Values

LONG

public static final int LONG

Data type of Java long

See Also:

Constant Field Values

LAMBDA

public static final int LAMBDA

Data type of a lambda expression

See Also:

Constant Field Values

NUMBER

public static final int NUMBER

See Also:

Constant Field Values

PATTERN

public static final int PATTERN

Variable contains a fact index

See Also:

Constant Field Values

LOCAL

public static final int LOCAL

Variable is local to a defrule or deffunction

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Constant Field Values

GLOBAL

public static final int GLOBAL

Variable is global

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Constant Field Values

ACCUM_RESULT

public static final int ACCUM_RESULT

Variable is an accumulate result

See Also:

Constant Field Values

AND

public static final int AND

Test is anded with previous

See Also:

Constant Field Values

OR

public static final int OR

Test is ored with previous

See Also:

Constant Field Values

Method Detail

getTypeName

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

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

getTypeCode

public static int getTypeCode(java.lang.String typeName)
                       throws JessException

Throws:

JessException

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

tagName

public static java.lang.String tagName(int tag)

removePrefix

public static java.lang.String removePrefix(java.lang.String name)

valueToObject

public static java.lang.Object valueToObject(java.lang.Class clazz,
                                             Value value,
                                             Context context)
                                      throws java.lang.IllegalArgumentException,
                                             JessException

Return a Java object derived from the Value which matches the Class object as closely as possible. If the class is a primitive Class standin like Integer.TYPE, then the returned value will be boxed; i.e., since this routine can't return an int, it will return an Integer. If there's no way to match the Value to the given Class, an IllegalArgumentException will be thrown. Jess uses this method internally to prepare arguments for reflective method calls.

Parameters:

clazz - the desired class of the result

value - the Value to be converted

context - a Context used for resolving the Value, if needed

Returns:

a Java object of the given class

Throws:

java.lang.IllegalArgumentException - if the conversion is impossible

JessException - if anything else goes wrong

valueToObject

public static java.lang.Object valueToObject(java.lang.Class clazz,
                                             Value value,
                                             Context context,
                                             boolean strict)
                                      throws java.lang.IllegalArgumentException,
                                             JessException

Return a Java object derived from the Value which matches the Class object as closely as possible. If the class is a primitive Class standin like Integer.TYPE, then the returned value will be boxed; i.e., since this routine can't return an int, it will return an Integer. Optionally, this method can allow generous conversions like parsing a String into a number. If there's no way to match the Value to the given Class, an IllegalArgumentException will be thrown. Jess uses this method internally to prepare arguments for reflective method calls.

Parameters:

clazz - the desired class of the result

value - the Value to be converted

context - a Context used for resolving the Value, if needed

strict - false to allow Strings to be parsed as numbers

Returns:

a Java object of the given class

Throws:

java.lang.IllegalArgumentException - if the conversion is impossible

JessException - if anything else goes wrong

objectToValue

public static Value objectToValue(java.lang.Class clazz,
                                  java.lang.Object obj)
                           throws JessException

Create a Jess Value object out of a Java Object. The Class object indicates whether the given object is boxed or not; i.e., the object may be an Integer while the Class is Integer.TYPE, indicating that the argument is actually a boxed int. Jess uses this internally to interpret the results of reflective method calls.

Parameters:

clazz - a Class representing the type of the other argument

obj - an object to be converted

Returns:

a Jess Value representing the value of the object

Throws:

JessException - if anything goes wrong