java jdk replace native class-file - class

Question

I have ImageView.class how to get the program to use it instead of the native javax.swing.text.html.ImageView?
javax.swing.text.html.ImageView map = new javax.swing.text.html.ImageView(); //does not work
I was told that it is necessary to use ClassFileTransformer and ClassLoader, but I can not find a working examples

Answer 1

I think that what you really want to do is to...
Extend HTMLEditorKit and override getViewFactory()
Have it return a class that extends HTMLEditorKit.HTMLFactory
In that class, override create() to return your custom view for <img> and super.create() otherwise
Like this:
class MyImageKit extends HTMLEditorKit {
private static final MyImageFactory myFactory = new MyImageFactory();
public ViewFactory getViewFactory() {
return myFactory;
}
static class MyImageFactory extends HTMLFactory {
public View create(Element elem) {
Object type = elem.getAttributes()
.getAttribute(StyleConstants.NameAttribute);
if(type == HTML.Tag.IMG) {
return new MyImageView(elem);
} else {
return super.create(elem);
}
}
}
}
class MyImageView extends ImageView {
MyImageView(Element elem) {
super(elem);
}
protected void setPropertiesFromAttributes() {
super.setPropertiesFromAttributes();
try {
ImageView.class.getDeclaredField("vAlign").set(this, new Float(0.75f));
} catch(Exception e) {
e.printStackTrace();
}
}
}