uk.ac.ed.epcc.safe.accounting.properties

Interface PropExpression<T>

Type Parameters:

T - type of expression

All Superinterfaces:

uk.ac.ed.epcc.webapp.Targetted<T>

All Known Subinterfaces:

ReferenceExpression<I>, ValueParserProvider<T>

All Known Implementing Classes:

BinaryPropExpression, CasePropExpression, ConstPropExpression, ConvertMillisecondToDatePropExpression, DeRefExpression, DoubleDeRefExpression, DoublePropExpression, DurationCastPropExpression, DurationPropExpression, DurationSecondsPropExpression, IndexedTag, IntPropExpression, LabelPropExpression, MilliSecondDatePropExpression, NamePropExpression, NegatePropExpression, PropertyTag, ReferenceTag, SelectPropExpression, StringPropExpression, TypeConverterPropertyTag, TypeConverterPropExpression

public interface PropExpression<T>
extends uk.ac.ed.epcc.webapp.Targetted<T>

Encodes an expression over properties. Note that a single property (i.e. a PropertyTag) is also a PropExpression. Classes that implement PropExpression should not reference the AppContext so they can safely be cached in the user session.

Author:

spb

Method Summary

Methods

Modifier and Type	Method and Description
<R> R	accept(BasePropExpressionVisitor<R> vis) Visitor pattern.
PropExpression<T>	copy() Generate an equivalent (and where possible immutable) copy of this expression.

Methods inherited from interface uk.ac.ed.epcc.webapp.Targetted

getTarget

Method Detail

accept

<R> R accept(BasePropExpressionVisitor<R> vis)
         throws java.lang.Exception

Visitor pattern. Have the BasePropExpressionVisitor visit this expression

Throws:

java.lang.Exception

Type Parameters:

R - type of return

Parameters:

vis - visitor

Returns:

result of type R

copy

PropExpression<T> copy()

Generate an equivalent (and where possible immutable) copy of this expression. Most implementing types should themselves be immutable, calling copy on their arguments and returning a self-reference for copy. In this case the return type of the function should be narrowed to the implemeting sub-type.

Returns:

PropExpression