Package com.inductiveautomation.perspective.gateway.binding.transforms.expression

Class ExpressionTransformParseContext

java.lang.Object

com.inductiveautomation.perspective.gateway.expression.AbstractExpressionParseContext

com.inductiveautomation.perspective.gateway.binding.expression.ExpressionBindingParseContext

com.inductiveautomation.perspective.gateway.binding.transforms.expression.ExpressionTransformParseContext

All Implemented Interfaces:

ExpressionParseContext

public class ExpressionTransformParseContext
extends ExpressionBindingParseContext

An ExpressionBindingParseContext which additionally wraps a ConstantExpression and a Predicate which returns true if the path in the bound Expression should delegate to the ConstantExpression. If the Predicate is false, this class will delegate to ExpressionBindingParseContext.createBoundExpression(String). Also exposes a method onValueChanged(QualifiedValue) to update the underlying ConstantExpression's internal QualifiedValue.

Field Summary

Fields inherited from class com.inductiveautomation.perspective.gateway.expression.AbstractExpressionParseContext

context, INITIAL_TAG_VALUE

Method Summary

Modifier and Type	Method	Description
Expression	createBoundExpression(String path)	Returns an internal ConstantExpression if the injected Predicate.test(Object) returns true for the given path input.

Methods inherited from class com.inductiveautomation.perspective.gateway.binding.expression.ExpressionBindingParseContext

getReferences

Methods inherited from class com.inductiveautomation.perspective.gateway.expression.AbstractExpressionParseContext

createExpressionForTagReference, getFunctionFactory

Methods inherited from class java.lang.Object

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

Method Details

createBoundExpression

public Expression createBoundExpression(String path)
                                 throws RuntimeException

Returns an internal ConstantExpression if the injected Predicate.test(Object) returns true for the given path input. If the predicate returns false, this method delegates to ExpressionBindingParseContext.createBoundExpression(String).

Specified by:

createBoundExpression in interface ExpressionParseContext

Overrides:

createBoundExpression in class ExpressionBindingParseContext

Parameters:

path - the text content inside the braces.

Throws:

RuntimeException - because the CUP parser doesn't have a throws on the function that calls this inside the parser