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From "Paul Philion" <>
Subject Some thoughts about runtime evaluation of properties
Date Tue, 25 Jul 2000 15:44:45 GMT
Greetings -

I would really prefer to see properties, including ${}, get evaluated
at runtime. I've been thinking about how that could be done.

- All properties are handled by Project, including any immutability,

- The Property task will simply setProperty on the Project. An
exception could be thrown, or the new property value could just be
ignored (Project will log it).

- A PropertySheet (or something like that) will handle storing the
properties. It will parse the ${} values and store special referring
properties that will not be evaluated until each getProperty request.

For example:
    <property name="lib.dir" value="${build.dir}/lib"/>

This will be stored (under the key "lib.dir") as a special object that
contain the "unresolved property" (build.dir) and the appended value

When code requests project.getProperty("lib.dir"), the PropertySheet
recognizes that the property is an unresolved (complex? dependant?)
property and does the immediate substitution before returning the

- Paul

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