Bug 305200 [EditorMgmt] FileEditorMappingContentProvider could just be replaced by ArrayContentProvider
This class doesn't seem to be very useful.
bundles/org.eclipse.ui.ide/extensions/org/eclipse/ui/dialogs/WizardExportPage.java
exportSpecifiedTypesRadio.setEnabled(!exportCurrentSelection);
        typesToExportField.setEnabled(exportSpecifiedTypesRadio.getSelection());
        typesToExportEditButton.setEnabled(exportSpecifiedTypesRadio
                .getSelection());
    }
    /* (non-Javadoc)
     * Method declared on WizardDataTransferPage.
     */
    protected final boolean validateSourceGroup() {
        if (exportCurrentSelection) {
			return true;
		}
        String sourceString = resourceNameField.getText();
        if (sourceString.equals("")) {
            setErrorMessage(null);
            return false;
        }
        IResource resource = getSourceResource();
        if (resource == null) {
            setErrorMessage(IDEWorkbenchMessages.WizardExportPage_mustExistMessage);
            return false;
        }
        if (!resource.isAccessible()) {
            setErrorMessage(IDEWorkbenchMessages.WizardExportPage_mustBeAccessibleMessage);
            return false;
        }
        return true;
    }
}