Package com.inductiveautomation.ignition.gateway.expressions

Class PropertyBasedExpressionParseContext

java.lang.Object

com.inductiveautomation.ignition.gateway.expressions.AbstractMultiLevelExpressionParseContext

com.inductiveautomation.ignition.gateway.expressions.PropertyBasedExpressionParseContext

All Implemented Interfaces:

ExpressionParseContext

Direct Known Subclasses:

AlarmExpressionParseContext

public class PropertyBasedExpressionParseContext
extends AbstractMultiLevelExpressionParseContext

This context creates expressions that reference properties. However, it also supports delegation to another ExpressionParseContext in the case that the referenced item is not a Property. To determine this, it uses a PropertyResolver.

Once built, the expression looks up the values of the referenced properties against the provided PropertyValueSource.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
protected class	PropertyBasedExpressionParseContext.PropertyReferenceExpression

Constructor Summary

Constructors

Constructor	Description
PropertyBasedExpressionParseContext(ExpressionParseContext parent, PropertyResolver propResolver, PropertyValueSource source, boolean allowSubscriptions)
PropertyBasedExpressionParseContext(ExpressionParseContext parent, PropertyResolver propResolver, PropertyValueSource source, FunctionFactory factory, boolean allowSubscriptions)

Method Summary

Modifier and Type	Method	Description
FunctionFactory	getFunctionFactory()
PropertyResolver	getResolver()
PropertyValueSource	getSource()
protected Expression	tryCreateBoundExpression(String path)	This function should create the expression if possible.

Methods inherited from class com.inductiveautomation.ignition.gateway.expressions.AbstractMultiLevelExpressionParseContext

createBoundExpression, getBaseFunctionFactory, getDelegateParseContext

Methods inherited from class java.lang.Object

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

Constructor Details

PropertyBasedExpressionParseContext

public PropertyBasedExpressionParseContext(ExpressionParseContext parent,
 PropertyResolver propResolver,
 PropertyValueSource source,
 boolean allowSubscriptions)

PropertyBasedExpressionParseContext

public PropertyBasedExpressionParseContext(ExpressionParseContext parent,
 PropertyResolver propResolver,
 PropertyValueSource source,
 FunctionFactory factory,
 boolean allowSubscriptions)

Method Details

getFunctionFactory

public FunctionFactory getFunctionFactory()

Specified by:

getFunctionFactory in interface ExpressionParseContext

Overrides:

getFunctionFactory in class AbstractMultiLevelExpressionParseContext

getSource

public PropertyValueSource getSource()

getResolver

public PropertyResolver getResolver()

tryCreateBoundExpression

protected Expression tryCreateBoundExpression(String path)

Description copied from class: AbstractMultiLevelExpressionParseContext

This function should create the expression if possible. If not, it should return null instead of throwing the error, in which case the parent parse context will be tried.

Specified by:

tryCreateBoundExpression in class AbstractMultiLevelExpressionParseContext