urlmappingsxmldao.java

sun公司的petstore,一个J2ee的示例应用程序.

            Node node = list.item(loop);
            if (node != null) {
                String exceptionClassName = "";
                String screen = null;
                // get exception nodes
                // need to be a element to get attributes
                if (node instanceof Element) {
                    Element element = ((Element)node);
                    exceptionClassName = element.getAttribute(EXCEPTION_CLASS);
                    screen = element.getAttribute(SCREEN);
                    exceptionMappings.put(exceptionClassName, screen);
                }

            }
        }
        return exceptionMappings;
    }

    public static HashMap getEventMappings(Element root) {
        HashMap eventMappings = new HashMap();
        NodeList list = root.getElementsByTagName(EVENT_MAPPING);
        for (int loop = 0; loop < list.getLength(); loop++) {
            Node node = list.item(loop);
            if (node != null) {
                String eventClassName = getSubTagValue(node,EVENT_CLASS);
                String ejbActionClass = getSubTagValue(node, EJB_ACTION_CLASS);
                if ((eventClassName != null) && !eventClassName.equals("")) {
                    eventMappings.put(eventClassName, new EventMapping(eventClassName, ejbActionClass));
                }
            }
        }
        return eventMappings;
    }
    public static HashMap getRequestMappings(Element root) {
        HashMap urlMappings = new HashMap();
        NodeList list = root.getElementsByTagName(URL_MAPPING);
        for (int loop = 0; loop < list.getLength(); loop++) {
            Node node = list.item(loop);
            if (node != null) {
                String url = "";
                String screen = null;
                String useActionString = null;
                String useFlowHandlerString = null;
                String requiresSigninString = null;
                String flowHandler = null;
                String webActionClass =null;
                String ejbActionClass = null;
                HashMap resultMappings = null;
                boolean useFlowHandler = false;
                boolean isAction = false;
                boolean requiresSignin = false;
                // get url mapping attributes
                // need to be a element to get attributes
                if (node instanceof Element) {
                    Element element = ((Element)node);
                    url = element.getAttribute(URL);
                    screen = element.getAttribute(NEXT_SCREEN);
                    useActionString = element.getAttribute(PROCESSS_ACTION);
                    useFlowHandlerString = element.getAttribute(USE_FLOW_HANDLER);
                }
                webActionClass = getSubTagValue(node, WEB_ACTION_CLASS);
                if (webActionClass != null) isAction= true;
                // get request handler
                if ((useFlowHandlerString != null) && useFlowHandlerString.equals("true")) useFlowHandler = true;
                // get flow handler
                if ((useFlowHandlerString != null) && useFlowHandlerString.equals("true")) useFlowHandler = true;
                if (useFlowHandler) {
                    // need to be a element to find sub nodes by name
                    if (node instanceof Element) {
                        Element element = (Element)node;
                        NodeList children = element.getElementsByTagName(FLOW_HANDLER);
                        Node flowHandlerNode = null;
                        if (children.getLength() >= 1) {
                            flowHandlerNode = children.item(0);
                        }
                        if (children.getLength() > 1) {
                                 System.err.println("Non fatal error: There can be only one <" + FLOW_HANDLER +
                                               "> definition in a <" + URL_MAPPING + ">");
                        }
                        // get the flow handler details
                        if (flowHandlerNode != null) {
                            if (flowHandlerNode instanceof Element) {
                                Element flowElement = (Element)flowHandlerNode;
                                flowHandler = flowElement.getAttribute(FLOW_HANDLER_CLASS);
                                NodeList results = flowElement.getElementsByTagName(HANDLER_RESULT);
                                if (results.getLength() > 0){
                                    resultMappings = new HashMap();
                                }
                                for (int resultLoop=0; resultLoop < results.getLength(); resultLoop++) {
                                    Node resultNode = results.item(resultLoop);
                                    if (resultNode instanceof Element) {
                                        Element resultElement = (Element)resultNode;
                                        String key = resultElement.getAttribute(RESULT);
                                        String value = resultElement.getAttribute(NEXT_SCREEN);
                                        if (!resultMappings.containsKey(key)) {
                                            resultMappings.put(key,value);
                                        } else {
                                            System.err.println("*** Non Fatal errror: Screen " + url + " <" + FLOW_HANDLER +
                                                           "> key " + "\"" + key + "\" defined more than one time");
                                        }
                                    }
                                } // end for
                            }
                        } // end if (flowHandler != null)
                    }
                } // end if (useFlowHandler)
                URLMapping mapping = new URLMapping(url, screen,
                                             isAction,
                                             useFlowHandler,
                                             webActionClass,
                                             flowHandler,
                                             resultMappings);

                if (!urlMappings.containsKey(url)) {
                    urlMappings.put(url, mapping);
                } else {
                    System.err.println("*** Non Fatal errror: Screen " + url +
                                       " defined more than once in screen definitions file");
                }
            }
        }
        return urlMappings;
    }

    public static String getSubTagValue(Node node, String subTagName) {
        String returnString = "";
        if (node != null) {
            NodeList  children = node.getChildNodes();
            for (int innerLoop =0; innerLoop < children.getLength(); innerLoop++) {
                Node  child = children.item(innerLoop);
                if ((child != null) && (child.getNodeName() != null) && child.getNodeName().equals(subTagName) ) {
                    Node grandChild = child.getFirstChild();
                    if (grandChild.getNodeValue() != null) return grandChild.getNodeValue();
                }
            } // end inner loop
        }
        return returnString;
    }

    public static String getSubTagValue(Element root, String tagName, String subTagName) {
        String returnString = "";
        NodeList list = root.getElementsByTagName(tagName);
        for (int loop = 0; loop < list.getLength(); loop++) {
            Node node = list.item(loop);
            if (node != null) {
                NodeList  children = node.getChildNodes();
                for (int innerLoop =0; innerLoop < children.getLength(); innerLoop++) {
                    Node  child = children.item(innerLoop);
                    if ((child != null) && (child.getNodeName() != null) && child.getNodeName().equals(subTagName) ) {
                        Node grandChild = child.getFirstChild();
                        if (grandChild.getNodeValue() != null) return grandChild.getNodeValue();
                    }
                } // end inner loop
            }
        }
        return returnString;
    }

    public static String getTagValue(Element root, String tagName) {
        String returnString = "";
        NodeList list = root.getElementsByTagName(tagName);
        for (int loop = 0; loop < list.getLength(); loop++) {
            Node node = list.item(loop);
            if (node != null) {
                Node child = node.getFirstChild();
                if ((child != null) && child.getNodeValue() != null) return child.getNodeValue();
            }
        }
        return returnString;
    }
}