return (getClipboardFiles() != null) && canPasteFilesOn(selection.getFirstElement());
String[] clipboardFiles= getClipboardFiles(); return clipboardFiles != null && allFilesExist(clipboardFiles) && canPasteFilesOn(selection.getFirstElement());
    private boolean canPasteFiles(IStructuredSelection selection) {		return (getClipboardFiles() != null) && canPasteFilesOn(selection.getFirstElement());    }