> ...then reflection would not be able to tell you that the instance you
created was intended to hold Strings.
If I create an abstract parent-class:
public abstract class ParentPage<K, V> {
public abstract void setKey(K key);
public abstract K getKey();
public abstract void setValue(V value);
public abstract V getValue();
}
And then I create an abstract subclass with a main-method:
public abstract class ChildPage extends ParentPage<Integer, List> {
Integer key;
List value;
public Integer getKey() { return key; }
public void setKey(Integer key) { this.key = key; }
public List getValue() { return value; }
public void setValue(List value) { this.value = value; }
public static void main(String[] args) {
for(Method method : ChildPage.class.getMethods()) {
if(!"void".equals(method.getReturnType().getName())) {
System.out.printf("Method: '%s', returnType '%s'\n",
method.getName(), method.getGenericReturnType());
}
}
}
}
And I run the main-method of the subclass, the output is:
Method: 'getValue', returnType 'interface java.util.List'
Method: 'getValue', returnType 'class java.lang.Object'
Method: 'getKey', returnType 'class java.lang.Integer'
Method: 'getKey', returnType 'class java.lang.Object'
[...]
Same goes for parameter-types.
Tapestry already has the className of the page it wants to
subclass/implement. To me it seems everything Tapestry needs to know is
available. As a matter of fact.... it may even be possible to implement
it without creating a dependancy on Java5 (in a Java5 VM you get more
methods with the same signatures back but with different return-types,
which is not possible in an older VM)?
Regards,
Onno Scheffers
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