From 0f7b405aa7b8a04770483ecfea13b37b5464922a Mon Sep 17 00:00:00 2001
From: Radim Blazek <radim.blazek@gmail.com>
Date: Fri, 8 Feb 2013 00:10:33 +0100
Subject: [PATCH] GML GetFeatureInfo XSD validation, disabled

---
 src/gui/qgsmaptoolidentify.cpp       | 19 +++++++++++
 src/providers/wms/qgswmsprovider.cpp | 50 ++++++++++++++++++++++++++--
 2 files changed, 67 insertions(+), 2 deletions(-)

diff --git a/src/gui/qgsmaptoolidentify.cpp b/src/gui/qgsmaptoolidentify.cpp
index cfc737a38bb1..b665634a631f 100644
--- a/src/gui/qgsmaptoolidentify.cpp
+++ b/src/gui/qgsmaptoolidentify.cpp
@@ -439,6 +439,25 @@ bool QgsMapToolIdentify::identifyRasterLayer( QList<IdentifyResult> *results, Qg
   {
     foreach ( int i, values.keys() )
     {
+      QVariant value = values.value( i );
+      if ( value.type() == QVariant::Bool && !value.toBool() )
+      {
+        // sublayer not visible or not queryable
+        continue;
+      }
+
+      if ( value.type() == QVariant::String )
+      {
+        // error
+        // TODO: better error reporting
+        QString label = layer->subLayers().value( i );
+        attributes.clear();
+        attributes.insert( tr( "Error" ), value.toString() );
+
+        results->append( IdentifyResult( qobject_cast<QgsMapLayer *>( layer ), label, attributes, derivedAttributes ) );
+        continue;
+      }
+
       // list of feature stores for a single sublayer
       QgsFeatureStoreList featureStoreList = values.value( i ).value<QgsFeatureStoreList>();
 
diff --git a/src/providers/wms/qgswmsprovider.cpp b/src/providers/wms/qgswmsprovider.cpp
index ea444bf26fa6..f368daa7a2f6 100644
--- a/src/providers/wms/qgswmsprovider.cpp
+++ b/src/providers/wms/qgswmsprovider.cpp
@@ -48,6 +48,11 @@
 #include <QNetworkDiskCache>
 #endif
 
+#if QT_VERSION >= 0x40600
+#include <QtXmlPatterns/QXmlSchema>
+#include <QtXmlPatterns/QXmlSchemaValidator>
+#endif
+
 #include <QUrl>
 #include <QIcon>
 #include <QImage>
@@ -3919,7 +3924,7 @@ QMap<int, QVariant> QgsWmsProvider::identify( const QgsPoint & thePoint, Identif
 
   //QgsFeatureList featureList;
 
-  int count = 0;
+  int count = -1;
   // Test for which layers are suitable for querying with
   for ( QStringList::const_iterator
         layers  = mActiveSubLayers.begin(),
@@ -3927,13 +3932,23 @@ QMap<int, QVariant> QgsWmsProvider::identify( const QgsPoint & thePoint, Identif
         layers != mActiveSubLayers.end();
         ++layers, ++styles )
   {
+    count++;
+
     // Is sublayer visible?
     if ( !mActiveSubLayerVisibility.find( *layers ).value() )
+    {
+      // TODO: something better?
+      // we need to keep all sublayers so that we can get their names in identify tool
+      results.insert( count, false );
       continue;
+    }
 
     // Is sublayer queryable?
     if ( !mQueryableForLayer.find( *layers ).value() )
+    {
+      results.insert( count, false );
       continue;
+    }
 
     QgsDebugMsg( "Layer '" + *layers + "' is queryable." );
 
@@ -4047,6 +4062,38 @@ QMap<int, QVariant> QgsWmsProvider::identify( const QgsPoint & thePoint, Identif
 
       if ( xsdPart >= 0 )  // XSD available
       {
+#if QT_VERSION >= 0x40600
+#if 0
+        // Validate GML by schema
+        // Loading schema takes ages! It needs to load all XSD referenced in the schema,
+        // for example:
+        // http://schemas.opengis.net/gml/2.1.2/feature.xsd
+        // http://schemas.opengis.net/gml/2.1.2/gml.xsd
+        // http://schemas.opengis.net/gml/2.1.2/geometry.xsd
+        // http://www.w3.org/1999/xlink.xsd
+        // http://www.w3.org/2001/xml.xsd <- this takes 30s to download (2/2013)
+
+        QXmlSchema schema;
+        schema.load( mIdentifyResultBodies.value( xsdPart ) );
+        // Unfortunately the schema cannot be successfully loaded, it reports error
+        // "Element {http://www.opengis.net/gml}_Feature already defined"
+        // there is probably a bug in QXmlSchema:
+        // https://bugreports.qt-project.org/browse/QTBUG-8394
+        // xmlpatternsvalidator gives the same error on XSD generated by OGR
+        if ( !schema.isValid() )
+        {
+          // TODO: return QgsError
+          results.insert( count, tr( "GML schema is not valid" ) );
+          continue;
+        }
+        QXmlSchemaValidator validator( schema );
+        if ( !validator.validate( mIdentifyResultBodies.value( gmlPart ) ) )
+        {
+          results.insert( count, tr( "GML is not valid" ) );
+          continue;
+        }
+#endif
+#endif
         gmlSchema.parseXSD( mIdentifyResultBodies.value( xsdPart ) );
       }
       else
@@ -4101,7 +4148,6 @@ QMap<int, QVariant> QgsWmsProvider::identify( const QgsPoint & thePoint, Identif
       }
       results.insert( count, qVariantFromValue( featureStoreList ) );
     }
-    count++;
   }
 
   QString str;