GUI: Determine the XML report format before reading report.

gui/resultsview.cpp

@@ -244,7 +244,22 @@ void ResultsView::DisableProgressbar()
 
 void ResultsView::ReadErrorsXml(const QString &filename)
 {
-    XmlReportV1 *report = new XmlReportV1(filename, this);
+    const int version = XmlReport::determineVersion(filename);
+    if (version == 0)
+    {
+        QMessageBox msgBox;
+        msgBox.setText(tr("Failed to read the report."));
+        msgBox.setIcon(QMessageBox::Critical);
+        msgBox.exec();
+        return;
+    }
+
+    XmlReport *report = NULL;
+    if (version == 1)
+        report = new XmlReportV1(filename, this);
+    else if (version == 2)
+        report = new XmlReportV2(filename, this);
+
     QList<ErrorLine> errors;
     if (report)
     {

gui/xmlreport.cpp

@@ -18,9 +18,13 @@
 
 #include <QObject>
 #include <QString>
+#include <QFile>
+#include <QXmlStreamReader>
 #include "report.h"
 #include "xmlreport.h"
 
+static const char ResultElementName[] = "results";
+static const char VersionAttribute[] = "version";
 
 XmlReport::XmlReport(const QString &filename, QObject * parent) :
     Report(filename, parent)
@@ -37,3 +41,47 @@ QString XmlReport::quoteMessage(const QString &message)
     quotedMessage.replace(">", "&gt;");
     return quotedMessage;
 }
+
+int XmlReport::determineVersion(const QString &filename)
+{
+    QFile file;
+    file.setFileName(filename);
+    bool succeed = file.open(QIODevice::ReadOnly | QIODevice::Text);
+    if (!succeed)
+        return 0;
+
+    QXmlStreamReader reader(&file);
+    while (!reader.atEnd())
+    {
+        switch (reader.readNext())
+        {
+        case QXmlStreamReader::StartElement:
+            if (reader.name() == ResultElementName)
+            {
+                QXmlStreamAttributes attribs = reader.attributes();
+                if (attribs.hasAttribute(QString(VersionAttribute)))
+                {
+                    int ver = attribs.value("", VersionAttribute).toString().toInt();
+                    return ver;
+                }
+                else
+                    return 1;
+            }
+            break;
+
+            // Not handled
+        case QXmlStreamReader::EndElement:
+        case QXmlStreamReader::NoToken:
+        case QXmlStreamReader::Invalid:
+        case QXmlStreamReader::StartDocument:
+        case QXmlStreamReader::EndDocument:
+        case QXmlStreamReader::Characters:
+        case QXmlStreamReader::Comment:
+        case QXmlStreamReader::DTD:
+        case QXmlStreamReader::EntityReference:
+        case QXmlStreamReader::ProcessingInstruction:
+            break;
+        }
+    }
+    return 0;
+}

gui/xmlreport.h

@@ -20,6 +20,7 @@
 #define XML_REPORT_H
 
 #include <QString>
+#include <QList>
 #include "report.h"
 
 class QObject;
@@ -36,12 +37,24 @@ class XmlReport : public Report
 public:
     XmlReport(const QString &filename, QObject * parent = 0);
 
+    /**
+     * @brief Read contents of the report file.
+     */
+    virtual QList<ErrorLine> Read() = 0;
+
     /**
      * @brief Quote the message.
      * @param message Message to quote.
      * @return quoted message.
      */
     static QString quoteMessage(const QString &message);
+
+    /**
+     * @brief Get the XML report format version from the file.
+     * @param filename Filename of the report file.
+     * @return XML report format version or 0 if error happened.
+     */
+    static int determineVersion(const QString &filename);
 };
 /// @}
 

gui/xmlreportv2.cpp

@@ -43,7 +43,7 @@ static const char VersionAttribute[] = "version";
 static const char VerboseAttribute[] = "verbose";
 
 XmlReportV2::XmlReportV2(const QString &filename, QObject * parent) :
-    Report(filename, parent),
+    XmlReport(filename, parent),
     mXmlReader(NULL),
     mXmlWriter(NULL)
 {

gui/xmlreportv2.h

@@ -36,7 +36,7 @@
 * This report outputs XML-formatted report. The XML format must match command
 * line version's XML output.
 */
-class XmlReportV2 : public Report
+class XmlReportV2 : public XmlReport
 {
 public:
     XmlReportV2(const QString &filename, QObject * parent = 0);