XPathContentWorkerSelector.java 文件源码

/**
 * Check the given document against the list of XPath statements provided.
 * 
 * @param doc          the XML document
 * @return                  Returns a content worker that was matched or <tt>null</tt>
 */
private W processDocument(Document doc)
{
    for (Map.Entry<String, W> entry : workersByXPath.entrySet())
    {
        try
        {
            String xpath = entry.getKey();
            W worker = entry.getValue();
            // Execute the statement
            Object ret = xpathFactory.newXPath().evaluate(xpath, doc, XPathConstants.NODE);
            if (ret != null)
            {
                // We found one
                return worker;
            }
        }
        catch (XPathExpressionException e)
        {
            // We accept this and move on
        }
    }
    // Nothing found
    return null;
}