uk.ac.ed.epcc.safe.accounting.expr

Interface ExpressionTarget

All Superinterfaces:

PropertyTarget

All Known Subinterfaces:

Allocation, ExpressionTargetContainer, UsageRecord

All Known Implementing Classes:

AccessorMap.ExpressionTargetProxy, AccountingClassification, AccountingLinkManager.PropertyTargetLink, AggregateUsageRecordFactory.AggregateRecord, AllocationFactory.AllocationRecord, CertificatePerson, ChargedAllocationFactory.ChargedAllocationRecord, DataObjectPropertyContainer, DerivedPropertyMap, PasswordPerson, Person, PropertyTargetHistoryFactory.HistoryUse, UsageRecordFactory.Use

public interface ExpressionTarget
extends PropertyTarget

A class that supports expressions over PropertyTags.

Author:

spb

Method Summary

Methods

Modifier and Type	Method and Description
<T> T	evaluateExpression(PropExpression<T> expr) Evaluate an expression on the target object
<T> T	evaluateExpression(PropExpression<T> expr, T def) Evaluate expression with default.
Parser	getParser() Get a Parser used to parse expressions for this target.

Methods inherited from interface uk.ac.ed.epcc.safe.accounting.properties.PropertyTarget

getProperty

Method Detail

getParser

Parser getParser()

Get a Parser used to parse expressions for this target.

Returns:

Parser

evaluateExpression

<T> T evaluateExpression(PropExpression<T> expr)
                     throws InvalidPropertyException

Evaluate an expression on the target object

Throws:

InvalidPropertyException

Type Parameters:

T - type of expression

Parameters:

expr - expression

Returns:

T

evaluateExpression

<T> T evaluateExpression(PropExpression<T> expr,
                       T def)

Evaluate expression with default. If the expression does not resolve then return the default value

Type Parameters:

T - type of expression

Parameters:

expr - expression

def - default value

Returns:

T