/* */package com.sun.j2ee.workflow.control.web;import org.xml.sax.InputSource;import org.w3c.dom.Element;import org.w3c.dom.Document;import org.w3c.dom.NodeList;import org.w3c.dom.Node;import org.xml.sax.SAXException;import org.xml.sax.SAXParseException;import org.xml.sax.SAXException;// jaxp 1.0.1 importsimport javax.xml.parsers.DocumentBuilderFactory;import javax.xml.parsers.DocumentBuilder;import java.net.URL;import java.util.ArrayList;import java.util.HashMap;import com.sun.j2ee.workflow.util.Debug;/** This class provides the data bindings for the screendefinitions.xml * and the requestmappings.xml file. * The data obtained is maintained by the ScreenFlowManager * @author Jian (James) Cai */public class ScreenFlowXmlDAO {    // constants    public static final String URL_MAPPING = "url-mapping";    public static final String EXCEPTION_MAPPING = "exception-mapping";    public static final String SCREEN_DEFINITION = "screen-definition";    public static final String URL = "url";    public static final String LANGUAGE = "language";    public static final String TEMPLATE = "template";    public static final String RESULT = "result";    public static final String NEXT_SCREEN = "screen";    public static final String USE_REQUEST_HANDLER = "useRequestHandler";    public static final String REQUIRES_SIGNIN = "requiresSignin";    public static final String USE_FLOW_HANDLER = "useFlowHandler";    public static final String FLOW_HANDLER_CLASS = "class";    public static final String REQUEST_HANDLER_CLASS = "request-handler-class";    public static final String HANDLER_RESULT = "handler-result";    public static final String FLOW_HANDLER = "flow-handler";    public static final String EXCEPTION_CLASS = "exception-class";    public static final String DEFAULT_SCREEN = "default-screen";    public static final String SIGNIN_SCREEN = "signin-screen";    public static final String SIGNIN_ERROR_SCREEN = "signin-error-screen";    public static final String KEY = "key";    public static final String VALUE= "value";    public static final String DIRECT="direct";    public static final String SCREEN= "screen";    public static final String SCREEN_NAME = "screen-name";    public static final String PARAMETER = "parameter";    public static Element loadDocument(String location) {        Document doc = null;        try {            URL url = new URL(location);            InputSource xmlInp = new InputSource(url.openStream());            DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance();            DocumentBuilder parser = docBuilderFactory.newDocumentBuilder();            doc = parser.parse(xmlInp);            Element root = doc.getDocumentElement();            root.normalize();            return root;        } catch (SAXParseException err) {            Debug.println ("ScreenFlowXmlDAO ** Parsing error" + ", line " +                        err.getLineNumber () + ", uri " + err.getSystemId ());            Debug.println("ScreenFlowXmlDAO error: " + err.getMessage ());        } catch (SAXException e) {            Debug.println("ScreenFlowXmlDAO error: " + e);        } catch (java.net.MalformedURLException mfx) {            Debug.println("ScreenFlowXmlDAO error: " + mfx);        } catch (java.io.IOException e) {            Debug.println("ScreenFlowXmlDAO error: " + e);        } catch (Exception pce) {            Debug.println("ScreenFlowXmlDAO error: " + pce);        }        return null;    }    public static ScreenFlowData loadScreenFlowData(String location) {        Element root = loadDocument(location);        HashMap screenDefinitionMappings = getScreenDefinitions(root);        HashMap exceptionMappings = getExceptionMappings(root);        String defaultScreen  = getTagValue(root, DEFAULT_SCREEN);        String signinScreen = getTagValue(root, SIGNIN_SCREEN);        String signinErrorScreen = getTagValue(root, SIGNIN_ERROR_SCREEN);        return new ScreenFlowData(exceptionMappings,                                  screenDefinitionMappings,                                  defaultScreen,                                  signinScreen,                                  signinErrorScreen);    }    public static HashMap loadScreenDefinitions(String location) {        Element root = loadDocument(location);        return getScreens(root);    }    public static HashMap loadRequestMappings(String location) {        Element root = loadDocument(location);        return getRequestMappings(root);    }    public static HashMap loadScreenDefinitionMappings(String location) {        Element root = loadDocument(location);        return getScreenDefinitions(root);    }    public static HashMap loadExceptionMappings(String location) {        Element root = loadDocument(location);        return getExceptionMappings(root);    }    private static String getSubTagAttribute(Element root, String tagName, String subTagName, String attribute) {        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) ) {                        if (child instanceof Element) {                            return ((Element)child).getAttribute(attribute);                        }                    }                } // end inner loop            }        }        return returnString;    }    public static HashMap getScreenDefinitions(Element root) {        HashMap screensDefs = new HashMap();        NodeList list = root.getElementsByTagName(SCREEN_DEFINITION);        for (int loop = 0; loop < list.getLength(); loop++) {            Node node = list.item(loop);            if (node != null) {                String language = null;                String url = null;                if (node instanceof Element) {                    language = ((Element)node).getAttribute(LANGUAGE);                    url = ((Element)node).getAttribute(URL);                }                if ((language != null) && (url != null) && !screensDefs.containsKey(language)) {                    screensDefs.put(language, url);                } else {                    Debug.println("*** Non Fatal errror: ScreenDefinitions for language " + language +                                       " defined more than once in screen definitions file");                }            }        }        return screensDefs;    }    public static HashMap getScreens(Element root) {        HashMap screens = new HashMap();        // get the template        String templateName = getTagValue(root, TEMPLATE);        screens.put(TEMPLATE, templateName);        // get screens        NodeList list = root.getElementsByTagName(SCREEN);        for (int loop = 0; loop < list.getLength(); loop++) {            Node node = list.item(loop);            if (node != null) {                String screenName = getSubTagValue(node, SCREEN_NAME);                HashMap parameters = getParameters(node);                Screen screen = new Screen(screenName, parameters);                if (!screens.containsKey(screenName)) {                    screens.put(screenName, screen);                } else {                    Debug.println("*** Non Fatal errror: Screen " + screenName +                                       " defined more than once in screen definitions file");                }            }        }        return screens;    }    private static HashMap getParameters(Node node) {        HashMap params = new HashMap();        if (node != null) {            NodeList  children = node.getChildNodes();