Package jmri.jmrit.logixng.util.parser

Class ExpressionNodeInstanceVariable

java.lang.Object

jmri.jmrit.logixng.util.parser.ExpressionNodeInstanceVariable

All Implemented Interfaces:

ExpressionNode, ExpressionNodeWithParameter

public class ExpressionNodeInstanceVariable
extends Object
implements ExpressionNodeWithParameter

A parsed expression

Constructor Summary

Constructors

Constructor	Description
ExpressionNodeInstanceVariable(String fieldName, Map<String,Variable> variables)

Method Summary

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

Methods inherited from class java.lang.Object

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

Methods inherited from interface jmri.jmrit.logixng.util.parser.ExpressionNode

assignValue

Methods inherited from interface jmri.jmrit.logixng.util.parser.ExpressionNodeWithParameter

calculate

Constructor Details

ExpressionNodeInstanceVariable

public ExpressionNodeInstanceVariable(String fieldName,
 Map<String,Variable> variables)
                               throws IdentifierNotExistsException

Throws:

IdentifierNotExistsException

Method Details

calculate

public Object calculate(Object parameter,
 SymbolTable symbolTable)
                 throws JmriException

Description copied from interface: ExpressionNodeWithParameter

Calculate the expression from a parameter.

Specified by:

calculate in interface ExpressionNodeWithParameter

Parameters:

parameter - the parameter

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(Object parameter,
 SymbolTable symbolTable,
 Object value)
                 throws JmriException

Assign a value to this expression from a parameter.

Specified by:

assignValue in interface ExpressionNodeWithParameter

Parameters:

parameter - the parameter

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