Package com.automation_pros.odva.cip.path

Class CipExpression

java.lang.Object

com.automation_pros.odva.cip.path.CipExpression

Direct Known Subclasses:

CipExpression.BinaryOp, CipExpression.Constant, CipExpression.TrinaryOp, CipExpression.UnaryOp, CipExpression.Variable

public abstract class CipExpression
extends java.lang.Object

Support expressions composed of variables, constants, and common operators, where variables are parsable CipPaths, and operators are applied in postfix (aka Reverse Polish Notation) order.

Commas and whitespace push a preceding item onto the execution stack. Numeric constants are introduced with the pound sign (aka "hash").

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	CipExpression.AddOp
static class	CipExpression.AndOp
static class	CipExpression.BinaryOp
static class	CipExpression.BitwiseOp
static class	CipExpression.CompareOp
static class	CipExpression.Constant
static class	CipExpression.DivideOp
static class	CipExpression.InvertOp
static class	CipExpression.LogicalAndOp
static class	CipExpression.LogicalOrOp
static class	CipExpression.MathOp
static class	CipExpression.ModulusOp
static class	CipExpression.MultiplyOp
static class	CipExpression.NotOp
static class	CipExpression.OrOp
static class	CipExpression.SubtractOp
static class	CipExpression.TrinaryOp
static class	CipExpression.UnaryOp
static class	CipExpression.Variable
static class	CipExpression.XorOp

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	CipExpression()

Method Summary

Modifier and Type	Method	Description
static long	as64(BaseDataType<?> data)
static boolean	asBool(BaseDataType<?> data)
abstract BaseDataType<?>	execute(DataContext ctx)
abstract java.util.List<CipPath>	getVariablePaths()
protected static boolean	hasTrail(java.io.StreamTokenizer st, int trail)
static void	main(java.lang.String[] args)
static CipExpression	parse(java.lang.String expression)
protected abstract java.lang.String	prefixedString(java.lang.String prefix)
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

CipExpression

protected CipExpression()

Method Detail

execute

public abstract BaseDataType<?> execute(DataContext ctx)

hasTrail

protected static boolean hasTrail(java.io.StreamTokenizer st,
                                  int trail)

parse

public static CipExpression parse(java.lang.String expression)

asBool

public static boolean asBool(BaseDataType<?> data)

as64

public static long as64(BaseDataType<?> data)

getVariablePaths

public abstract java.util.List<CipPath> getVariablePaths()

prefixedString

protected abstract java.lang.String prefixedString(java.lang.String prefix)

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

main

public static void main(java.lang.String[] args)