ManifestParser.java 文件源码

private static Iterable<String> getAttrNames(InputStream is, XPathExpression expr) {
    Set<String> names = Sets.newHashSet();
    if (expr != null) {
        try {
            Document doc = parseStream(is);
            if (doc != null) {
                NodeList nodelist = (NodeList) expr.evaluate(doc, XPathConstants.NODESET);
                for (int i = 0; i < nodelist.getLength(); i++) {
                    String name = nodelist.item(i).getNodeValue();
                    names.add(name);
                }
            }
        } catch (XPathExpressionException ex) {
            LOG.log(Level.WARNING, null, ex);
        }
    }
    return names;
}