Package jmri.jmrit.logixng.util.parser

Class ExpressionNodeIdentifier

java.lang.Object

jmri.jmrit.logixng.util.parser.ExpressionNodeIdentifier

All Implemented Interfaces:

ExpressionNode

public class ExpressionNodeIdentifier
extends Object
implements ExpressionNode

A parsed expression

Constructor Summary

Constructors

Constructor	Description
ExpressionNodeIdentifier(Token token, Map<String,Variable> variables)

Method Summary

Modifier and Type	Method	Description
void	assignValue(SymbolTable symbolTable, Object value)	Assign a value to this expression
Object	calculate(SymbolTable symbolTable)	Calculate the expression
boolean	canBeAssigned()	Can this expression be assigned a value?
String	getDefinitionString()	Get a String that defines this expression node.
String	getIdentifier()

Methods inherited from class java.lang.Object

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

Constructor Details

ExpressionNodeIdentifier

public ExpressionNodeIdentifier(Token token,
 Map<String,Variable> variables)
                         throws IdentifierNotExistsException

Throws:

IdentifierNotExistsException

Method Details

getIdentifier

public String getIdentifier()

calculate

public Object calculate(SymbolTable symbolTable)
                 throws JmriException

Description copied from interface: ExpressionNode

Calculate the expression

Specified by:

calculate in interface ExpressionNode

Parameters:

symbolTable - the symbol table

Returns:

the result

Throws:

JmriException - if an error occurs

canBeAssigned

public boolean canBeAssigned()

Can this expression be assigned a value?

Specified by:

canBeAssigned in interface ExpressionNode

Returns:

true if it's possible to assign a value to this expression, false otherwise

assignValue

public void assignValue(SymbolTable symbolTable,
 Object value)
                 throws JmriException

Assign a value to this expression

Specified by:

assignValue in interface ExpressionNode

Parameters:

symbolTable - the symbol table

value - the value to assign

Throws:

JmriException - if an error occurs

getDefinitionString

public String getDefinitionString()

Get a String that defines this expression node.

Specified by:

getDefinitionString in interface ExpressionNode

Returns:

the string