jess
Class Variable

java.lang.Object
  jess.Value
      jess.Variable

All Implemented Interfaces:

java.io.Serializable

public class Variable

extends Value

implements java.io.Serializable

A class to represent a Jess variable. It is 'self-resolving' using Context.

(C) 2006 Sandia National Laboratories

See Also:

Serialized Form

Constructor Summary

Variable(java.lang.String name, int type)
Create a Variable.

Method Summary

Fact	factValue(Context c) Resolves the variable, then returns the value as a Fact
double	floatValue(Context c) Resolves the variable, then returns the value as a float
int	intValue(Context c) Resolves the variable, then returns the value as an int
java.lang.Object	javaObjectValue(Context c) Resolves the variable, then returns the value as an Java object.
ValueVector	listValue(Context c) Resolves the variable, then returns the value as a list
double	numericValue(Context c) Resolves the variable, then returns the value as a float
Value	resolveValue(Context c) Will resolve the variable (return the value it represents.)
java.lang.String	stringValue(Context c) Resolves the variable, then returns the value as a string
java.lang.String	symbolValue(Context c) Resolves the variable, then returns the value as a symbol
java.lang.String	variableValue(Context c) Returns the name of this variable

Methods inherited from class jess.Value

atomValue, equals, equals, equalsStar, externalAddressValue, funcallValue, functionValue, hashCode, isLexeme, isNumeric, longValue, toString, toStringWithParens, type

Methods inherited from class java.lang.Object

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

Constructor Detail

Variable

public Variable(java.lang.String name,
                int type)
         throws JessException

Create a Variable.

Parameters:

name - the name of the variable

type - RU.VARIABLE or RU.MULTIVARIABLE

Throws:

JessException - if the type is invalid

Method Detail

resolveValue

public Value resolveValue(Context c)
                   throws JessException

Will resolve the variable (return the value it represents.)

Overrides:

resolveValue in class Value

Parameters:

c - an evaluation context. Cannot be null!

Returns:

the value of this variable

Throws:

JessException - if the variable is undefined.

See Also:

Variable, Funcall

javaObjectValue

public final java.lang.Object javaObjectValue(Context c)
                                       throws JessException

Resolves the variable, then returns the value as an Java object.

Overrides:

javaObjectValue in class Value

Parameters:

c - the execution context used to resolve the value

Returns:

the Java object

Throws:

JessException - if this value does not contain a Java object

factValue

public final Fact factValue(Context c)
                     throws JessException

Resolves the variable, then returns the value as a Fact

Overrides:

factValue in class Value

Parameters:

c - the execution context used to resolve the value

Returns:

the fact

Throws:

JessException - if this value does not contain a fact

listValue

public final ValueVector listValue(Context c)
                            throws JessException

Resolves the variable, then returns the value as a list

Overrides:

listValue in class Value

Parameters:

c - the execution context used to resolve the value

Returns:

the list

Throws:

JessException - if this value does not contain a list

intValue

public final int intValue(Context c)
                   throws JessException

Resolves the variable, then returns the value as an int

Overrides:

intValue in class Value

Parameters:

c - the execution context used to resolve the value

Returns:

the number as an int

Throws:

JessException - if this value does not contain any kind of number

floatValue

public final double floatValue(Context c)
                        throws JessException

Resolves the variable, then returns the value as a float

Overrides:

floatValue in class Value

Parameters:

c - the execution context used to resolve the value

Returns:

the number as a double

Throws:

JessException - if this value does not contain any kind of number.

numericValue

public final double numericValue(Context c)
                          throws JessException

Resolves the variable, then returns the value as a float

Overrides:

numericValue in class Value

Parameters:

c - the execution context used to resolve the value

Returns:

the number as a double

Throws:

JessException - if this value does not contain any kind of number

symbolValue

public final java.lang.String symbolValue(Context c)
                                   throws JessException

Resolves the variable, then returns the value as a symbol

Overrides:

symbolValue in class Value

Parameters:

c - the execution context used to resolve the value

Returns:

the symbol

Throws:

JessException - if this value does not contain any kind of String

variableValue

public final java.lang.String variableValue(Context c)

Returns the name of this variable

Overrides:

variableValue in class Value

Parameters:

c - the execution context used to resolve the value

Returns:

the name of the variable

stringValue

public final java.lang.String stringValue(Context c)
                                   throws JessException

Resolves the variable, then returns the value as a string

Overrides:

stringValue in class Value

Parameters:

c - the execution context used to resolve the value

Returns:

the string

Throws:

JessException - if this value does not contain any kind of String.