ArgumentUtils.java 文件源码

public static RevisionAwareXPath parseXPath(final StmtContext<?, ?, ?> ctx, final String path) {
    final XPath xPath = XPATH_FACTORY.get().newXPath();
    xPath.setNamespaceContext(StmtNamespaceContext.create(ctx,
            ImmutableBiMap.of(RFC6020_YANG_NAMESPACE.toString(), YANG_XPATH_FUNCTIONS_PREFIX)));

    final String trimmed = trimSingleLastSlashFromXPath(path);
    try {
        // XPath extension functions have to be prefixed
        // yang-specific XPath functions are in fact extended functions, therefore we have to add
        // "yang" prefix to them so that they can be properly validated with the XPath.compile() method
        // the "yang" prefix is bound to RFC6020 YANG namespace
        final String prefixedXPath = addPrefixToYangXPathFunctions(trimmed, ctx);
        // TODO: we could capture the result and expose its 'evaluate' method
        xPath.compile(prefixedXPath);
    } catch (final XPathExpressionException e) {
        LOG.warn("Argument \"{}\" is not valid XPath string at \"{}\"", path, ctx.getStatementSourceReference(), e);
    }

    return new RevisionAwareXPathImpl(path, PATH_ABS.matcher(path).matches());
}