ResolveParentVersionMojo.java 文件源码

private Element getParentVersionElement(Document doc) throws MojoExecutionException {
    XPath xPath = XPathFactory.newInstance().newXPath();

    try {
        NodeList nodes = ((NodeList) xPath.evaluate("/project/parent/version", doc.getDocumentElement(), XPathConstants.NODESET));
        if (nodes.getLength() == 0) {
            return null;
        }

        return (Element) nodes.item(0);

    } catch (XPathExpressionException e) {
        throw new MojoExecutionException("Failed to evaluate xpath expression", e);
    }
}