teststoragemanager.java

一个在线学习系统的服务端SERVLET程序

            }
            // Write to external file
        }
        if (type == QUESTION) {
            /** Get the question object */
            Question question = (Question) indicator;
            // Visit children the root
            List children = root.getChildren();
            for (int i = 0; i < children.size(); i++) {
                Element c = (Element) children.get(i);
                if (Long.parseLong(c.getAttributeValue("id")) ==
                    question.getKpID()) {
                    List children2 = c.getChildren();
                    for (int j = 0; j < children2.size(); j++) {
                        Element cc = (Element) children2.get(j);
                        if (Long.parseLong(cc.getAttributeValue("id")) ==
                            question.getId()) {
                            children2.remove(j);
                            break;
                        }
                    }
                }
            }
        }
        // Output the content
        try {
            XMLUtils.writeToXML(root, testFile);
        }
        catch (Exception e) {
            MessageUtils.debug(e);
            throw new RuntimeException("Can not save the modification.");
        }
        return true;
    }

    /**
     * Get the specified record of the external storage file.
     * For each sub-class, the parameter should be casted
     * into the specific domain objects, such as Category,
     * Course, etc.
     *
     * @param indicator The identifier of the record to be retrieved.
     * 					It can an integer, such as "id"; Or a String
     * 					, such as "name"
     * @return Whether the operation is successful
     */
    public Object getRecord(Object indicator) {
        if (indicator != null && indicator instanceof Map) {
            return _getQuestionsOfTest(indicator);
        }
        int type = determineType(indicator);
        if (type == KNOWLEDGEPOINT) {
            /** Get the knowledge point object */
            // Get the document root
            Element root = null;
            try {
                root = XMLUtils.loadFromXML(testFile);
            }
            catch (Exception e) {
                MessageUtils.debug(e);
                return null;
            }
            // KnowledgePoint object
            KnowledgePoint cat = (KnowledgePoint) indicator;
            // Visit children the root
            List children = root.getChildren();
            for (int i = 0; i < children.size(); i++) {
                Element c = (Element) children.get(i);
                if (Long.parseLong(c.getAttributeValue("id")) == cat.getId()) {
                    cat.setName(c.getAttributeValue("name"));
                    cat.setDescription(c.getAttributeValue("desc"));
                    break;
                }
            }
            return cat;
        }
        if (type == QUESTION) {
            /** Get the question object */
            // Get the document root
            Element root = null;
            try {
                root = XMLUtils.loadFromXML(testFile);
            }
            catch (Exception e) {
                MessageUtils.debug(e);
                return null;
            }
            // Question object
            Question c = (Question) indicator;
            // Visit children the root
            List children = root.getChildren();
            for (int i = 0; i < children.size(); i++) {
                Element cc = (Element) children.get(i);
                if (Long.parseLong(cc.getAttributeValue("id")) == c.getKpID()) {
                    List children2 = cc.getChildren();
                    for (int j = 0; j < children2.size(); j++) {
                        Element question = (Element) children2.get(j);
                        if (Long.parseLong(question.getAttributeValue("id")) ==
                            c.getId()) {
                            c.setAnswer(question.getAttributeValue("answer"));
                            c.setChoice(question.getAttributeValue("choice"));
                            c.setHardNo(Integer.parseInt(question.
                                getAttributeValue("hardNo")));
                            c.setPhoto(question.getAttributeValue("photo"));
                            c.setPublishDate(question.getAttributeValue(
                                "publichDate"));
                            c.setQuestion(question.getAttributeValue("question"));
                            c.setTip(question.getAttributeValue("tip"));
                            c.setQuestionType(Integer.parseInt(question.
                                getAttributeValue("questionType")));
                            break;
                        }
                    }
                }
            }
            return c;
        }
        return null;

    }

    /**
     * Get all specified tests of the external storage file.
     * For each sub-class, the parameter should be casted
     * into the specific domain objects, such as Question,
     * KnowledgePoint, etc.
     *
     * <p>
     * The returned list will have the following structure:
     * 		knowledgepoint1, knowledgepoint2, ..., childrenMap
     * 										          |
     * 									question1, question2, ..., question-n
     *
     * </p>
     *
     * <p>
     * The parameter is not used in this method.
     * </p>
     *
     * @param indicator The identifier of the record to be retrieved.
     * 					It can an integer, such as "id"; Or a String
     * 					, such as "name"
     * @return Whether the operation is successful
     */
    public List getRecords(Object indicator) {
        if (indicator != null && indicator instanceof Map) {
            return _getTestsOfUser(indicator);
        }
        if (indicator != null && indicator instanceof List) {
            return _getQuestionsOfTestResult(indicator);
        }
        // The returned list
        List ret = new ArrayList();
        // Get the document root
        Element root = null;
        try {
            root = XMLUtils.loadFromXML(testFile);
        }
        catch (Exception e) {
            MessageUtils.debug(e);
            throw new RuntimeException("Can not open the test data file.");
        }
        // Handle the document
        List kps = root.getChildren();
        Map childrenOfKP = new HashMap();
        int questionIndex = 0;
        for (int i = 0; i < kps.size(); i++) {
            Element element = (Element) kps.get(i);
            String name = element.getName().trim();
            if (!name.equals("knowledgepoint"))
                continue;
            // Read the knowledge point information and add it into the list
            KnowledgePoint kp = new KnowledgePoint();
            kp.setId(Long.parseLong(element.getAttributeValue("id")));
            kp.setName(element.getAttributeValue("name"));
            kp.setDescription(element.getAttributeValue("desc"));
            ret.add(kp);
            // Read the children of the knowledge point
            List questions = element.getChildren();
            for (int j = 0; j < questions.size(); j++) {
                Element question = (Element) questions.get(j);
                String cName = question.getName().trim();
                if (!cName.equals("question"))
                    continue;
                // Read the question information and put it into the map
                Question c = new Question();
                c.setKpID(kp.getId());
                c.setId(Long.parseLong(question.getAttributeValue("id")));
                c.setAnswer(question.getAttributeValue("answer"));
                c.setChoice(question.getAttributeValue("choice"));
                c.setHardNo(Integer.parseInt(question.getAttributeValue(
                    "hardNo")));
                c.setPhoto(question.getAttributeValue("photo"));
                c.setPublishDate(question.getAttributeValue("publichDate"));
                c.setQuestion(question.getAttributeValue("question"));
                c.setTip(question.getAttributeValue("tip"));
                c.setQuestionType(Integer.parseInt(question.getAttributeValue(
                    "questionType")));
                childrenOfKP.put("question" + (questionIndex++), c);
            }
        }
        ret.add(childrenOfKP);
        return ret;
    }

    private List _getTestsOfUser(Object indicator) {
        String loginID = (String) ( (Map) indicator).get("loginID");
        // Result
        List results = new ArrayList();
        // Get the document root and the user element
        Element root = null;
        Element userElement = null;
        try {
            root = XMLUtils.loadFromXML(testResultFile);
            List children = root.getChildren();
            for (int i = 0; i < children.size(); i++) {
                Element temp = (Element) children.get(i);
                if (temp.getAttributeValue("id").trim().equals(loginID.trim())) {
                    userElement = temp;
                    List children2 = userElement.getChildren();
                    for (int j = 0; j < children2.size(); j++) {
                        Element test = (Element) children2.get(j);
                        TestResult r = new TestResult();
                        r.setId(Long.parseLong(test.getAttributeValue("id")));
                        r.setTestDate(test.getAttributeValue("date"));
                        results.add(r);
                    }
                }
            }
        }
        catch (Exception e) {
            MessageUtils.debug(e);
            return null;
        }
        return results;
    }

    private List _getQuestionsOfTest(Object indicator) {
        String loginID = (String) ( (Map) indicator).get("loginID");
        String testID = (String) ( (Map) indicator).get("testID");
        // Result
        List results = new ArrayList();
        // Get the document root and the user element
        Element root = null;
        Element userElement = null;
        try {
            root = XMLUtils.loadFromXML(testResultFile);
            List children = root.getChildren();
            for (int i = 0; i < children.size(); i++) {
                Element temp = (Element) children.get(i);
                if (temp.getAttributeValue("id").trim().equals(loginID.trim())) {
                    userElement = temp;
                    List children2 = userElement.getChildren();
                    for (int j = 0; j < children2.size(); j++) {
                        Element test = (Element) children2.get(j);
                        if (test.getAttributeValue("id").trim().equals(testID.
                            trim())) {
                            List children3 = test.getChildren();
                            for (int k = 0; k < children3.size(); k++) {
                                Element question = (Element) children3.get(k);
                                TestResult r = new TestResult();
                                r.setQuestionID(Long.parseLong(question.
                                    getAttributeValue("id")));
                                r.setCorrect(new Boolean(question.
                                    getAttributeValue(
                                    "result")).booleanValue());
                                r.setYourA(question.getText());
                                results.add(r);
                            }
                        }
                    }
                }
            }
        }
        catch (Exception e) {
            MessageUtils.debug(e);
            return null;
        }
        return results;
    }

    private List _getQuestionsOfTestResult(Object indicator) {
        List testResults = (List) indicator;
        // Get the document root
        Element root = null;
        try {
            root = XMLUtils.loadFromXML(testFile);
        }
        catch (Exception e) {
            MessageUtils.debug(e);
            return null;
        }
        // Visit children the root
        List children = root.getChildren();
        for (int k = 0; k < testResults.size(); k++) {
            for (int i = 0; i < children.size(); i++) {
                Element cc = (Element) children.get(i);
                List children2 = cc.getChildren();
                for (int j = 0; j < children2.size(); j++) {
                    Element question = (Element) children2.get(j);
                    if (Long.parseLong(question.getAttributeValue("id")) ==
                        ( (TestResult) testResults.get(k)).getQuestionID()) {
                        Question c = new Question();
                        c.setAnswer(question.getAttributeValue("answer"));
                        c.setChoice(question.getAttributeValue("choice"));
                        c.setHardNo(Integer.parseInt(question.
                            getAttributeValue("hardNo")));
                        c.setPhoto(question.getAttributeValue("photo"));
                        c.setPublishDate(question.getAttributeValue(
                            "publichDate"));
                        c.setQuestion(question.getAttributeValue("question"));
                        c.setTip(question.getAttributeValue("tip"));
                        c.setQuestionType(Integer.parseInt(question.
                            getAttributeValue("questionType")));
                        ( (TestResult) testResults.get(k)).setQuestion(c);
                        break;
                    }
                }
            }
        }
        return testResults;

    }

}