Processing 1.0 - Processing Discourse - how to dynamically access data within a class

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Index › Programming Questions & Help › Syntax Questions › how to dynamically access data within a class

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how to dynamically access data within a class (Read 399 times)

Neurad

how to dynamically access data within a class
Aug 25^th, 2009, 5:41am

Hi,

Here's my problem:
I'm trying to load XML data in order to recreate the objects in my program.

Loading is fine. But when I want to write the data in the object, instead of manually assign every variable separately, I'd prefer to do something like that :
Code:

for (int j = 0; j < numAttributes; j++)
    {
      XMLElement attribute = souvenir.getChild(j);
      String attributeName = attribute.getName();

      souvenirPool[i].'attributeName' = attribute.getContent();

So it would automatically select the attribute to be initialized.

and here I have no clue about the syntax to do this kind of thing, I don't event know if it's possible... Undecided

any idea ?
is there any preexistent class to import xml objects ?

thanks in advance...

antiplastik

Re: how to dynamically access data within a class
Reply #1 - Aug 25^th, 2009, 6:34am

You can do that with java.lang.reflect.

Quote:

HashMap values = new HashMap();
values.put("myParam1", 10);
values.put("myParam2", 12);

class MyClass {
  public int myParam1;
  public int myParam2;
  void check() {
    println(myParam1);
    println(myParam2);
  }
}

MyClass myObject = new MyClass();
java.lang.reflect.Field[] fields = myObject.getClass().getFields();
for (int i = 0; i < fields.length; i++) {
  Integer value = (Integer) values.get(fields[i].getName());
  try {
    fields[i].setInt(myObject, value.intValue());
  } catch (Exception e) {
  }
}
myObject.check();

Link to the Javadoc:
http://java.sun.com/j2se/1.5.0/docs/api/java/lang/reflect/Field.html

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