Bug 76439 Classfile editor: Allow source attachment option for classes in class folders
20041017 When you open a class file for a class folder that has no source attchment you see a message 'No source available...' but no button that brings you to the source attachment page like it is done for JARs. ClassfileEditor line 225 is too restrictive, the test .isArchive() seems to be too much
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javaeditor/ClassFileEditor.java
*/
	protected IJavaElement getInputJavaElement() {
		if (getEditorInput() == null)
			return null;
		
		return ((IClassFileEditorInput)getEditorInput()).getClassFile();
	}
	
	/*
	 * @see IEditorPart#saveState(IMemento)
	 */
	public void saveState(IMemento memento) {
	}
	
	/*
	 * @see JavaEditor#setOutlinePageInput(JavaOutlinePage, IEditorInput)
	 */
	protected void setOutlinePageInput(JavaOutlinePage page, IEditorInput input) {
		if (page != null && input instanceof IClassFileEditorInput) {
			IClassFileEditorInput cfi= (IClassFileEditorInput)input;
			IClassFile cf= cfi.getClassFile();
			if (cf != null && cf.exists())
				page.setInput(cf);
			else
				page.setInput(null);
		}
	}
	
	/*
	 * 1GEPKT5: ITPJUI:Linux - Source in editor for external classes is editable