Package 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 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.