org.apache.tools.ant

Interface PropertyHelper.PropertyEvaluator

All Superinterfaces:

PropertyHelper.Delegate

All Known Implementing Classes:

LocalProperties

Enclosing class:

PropertyHelper

public static interface PropertyHelper.PropertyEvaluator
extends PropertyHelper.Delegate

Looks up a property's value based on its name.

Can be used to look up properties in a different storage than the project instance (like local properties for example) or to implement custom "protocols" like Ant's ${toString:refid} syntax.

Since:

Ant 1.8.0

Method Summary

Modifier and Type	Method and Description
java.lang.Object	evaluate(java.lang.String property, PropertyHelper propertyHelper) Evaluate a property.

Method Detail

evaluate

java.lang.Object evaluate(java.lang.String property,
                          PropertyHelper propertyHelper)

Evaluate a property.

Parameters:

property - the property's String "identifier".

propertyHelper - the invoking PropertyHelper.

Returns:

null if the property name could not be found, an instance of NullReturn to indicate a property with a name that can be matched but a value of null and the property's value otherwise.