Name: dsR10051 Date: 07/05/2000


The method
protected void loadChildren(ViewFactory f)
of the javax.swing.text.ZoneView class
throws unexpected ArrayIndexOutOfBoundsException
if ZoneView is created by Element that has zero difference
between getStartOffset() and getEndOffset().

Here is a minimized test:
import javax.swing.text.*;

public class ZoneViewTest05 {
    public static void main (String[] args) {

        Element elem = new StubElement("");
        int axis = View.X_AXIS;
        StubZoneView zone = new StubZoneView(elem, axis);
        zone.loadChildren((ViewFactory) null);
    }
}

class StubElement implements Element {
    Document document = new DefaultStyledDocument();

    public StubElement(String context) {
        super();
        try {
            document.insertString(0, context, new SimpleAttributeSet());
        } catch (BadLocationException e) {}
    }

    public Document getDocument() { return document; }
    public Element getParentElement() { return null; }
    public String getName() { return "StubElement"; }
    public AttributeSet getAttributes() { return new SimpleAttributeSet(); }
    public int getStartOffset() { return 0; }
    public int getEndOffset() { return document.getLength(); }
    public int getElementIndex(int offset) { return 0; }
    public int getElementCount() { return 1; }
    public Element getElement(int index) { return this; }
    public boolean isLeaf() { return true; }
}

class StubZoneView extends ZoneView {
  public StubZoneView (Element elem, int axis) {
    super (elem, axis);
  }
  public void loadChildren(ViewFactory f) {
    super.loadChildren(f);
  }
}

--- Output ---

%/usr/local/java/jdk1.4/solaris/bin/java -version
java version "1.4.0beta"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.0beta-b21)
Java HotSpot(TM) Client VM (build 1.3.0rc3-Z, interpreted mode)

%/usr/local/java/jdk1.4/solaris/bin/java ZoneViewTest05
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException
        at javax.swing.text.CompositeView.getView(CompositeView.java:146)
        at javax.swing.text.ZoneView.handleInsert(ZoneView.java:248)
        at javax.swing.text.ZoneView.loadChildren(ZoneView.java:218)
        at StubZoneView.loadChildren(ZoneViewTest05.java:40)
        at ZoneViewTest05.main(ZoneViewTest05.java:9)
%


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