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

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`Expression`	`createBoundExpression(java.lang.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.expression.AbstractExpressionParseContext
createExpressionForTagReference, getFunctionFactory

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Method Detail
  - createBoundExpression
```
public Expression createBoundExpression(java.lang.String path)
                                 throws java.lang.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:
    
    java.lang.RuntimeException - because the CUP parser doesn't have a throws on the function that calls this inside the parser