Re: What is the difference between a nested element and a nested
type? | Re: What is the difference between a nested element and a nested
type? 2005-06-09 - By peter reilly
Antoine Levy-Lambert wrote:
>>--- Urspr??ngliche Nachricht ---
>>Von: Eric Tchepannou <mellists@(protected)>
>>An: user@(protected)
>>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My guess is that public void add(BaseType) is obsolete.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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