Antoine Levy-Lambert wrote:
--- Ursprüngliche Nachricht ---
Von: Eric Tchepannou <[EMAIL PROTECTED]>
An: user@ant.apache.org
Betreff: Re: What is the difference between a nested element and a nested
type?
Datum: Thu, 9 Jun 2005 10:32:51 +0100
Thanks a lot for that Antoine. That was very clear to me.
I was able to check at
http://www.oracle.com/technology/pub/articles/bodewig_taskwriters.html
and I think the correct syntax (at least the one used there) to nest
types is
public void addSomething(BaseType t);
this one means :
- map <something/> to instantiating BaseType
- and creates the BaseType from the nested element <something/>
I have been using
public void add(BaseType);
and experience problems with this syntax. I will later rewrite my code
accordingly and see how it behaves.
My guess is that public void add(BaseType) is obsolete. I use 1.6.2. I
am just wondering why the Ant documentation keeps mentioning this...
No, it is not obsolete, but it will only work if you are mapping BaseType to
an XML tag name such as <basetype/> using the <typedef/> task before.
And one can used types that derive from the base type as follows (continuing
my previous example):
----- Derived.java ----
package my;
public class Derived extends Type {
}
----- build.xml -----
...
<target name="works" depends="compile">
<taskdef name="task" classname="my.Task"
classpath="classes" loaderref="my.loaderref"/>
<typedef name="type" classname="my.Type"
loaderref="my.loaderref"/>
<typedef name="derived" classname="my.Derived"
loaderref="my.loaderref"/>
<task>
<type/>
</task>
<task>
<derived/>
</task>
</target>
...
However this may be not what you want to do. One
can just use nested elements discoved by reflection as
Antonie has shown above.
---- Reflect.java --
package my;
public class Reflect extends org.apache.tools.ant.Task {
public void addBase(Type p) {
}
public void addDerived(Derived p) {
}
}
---- build.xml ---
..
<target name="reflect" depends="compile">
<taskdef name="reflect" classname="my.Reflect"
classpath="classes" loaderref="my.loaderref"/>
<reflect>
<base/>
<derived/>
</reflect>
</target>
..
Peter
Eric
Antoine
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