save timestamp in project file

git-svn-id: http://svn.osgeo.org/qgis/trunk@15752 c8812cc2-4d05-0410-92ff-de0c093fc19c
qgis · Apr 17, 2011 · abfd799 · abfd799
1 parent 99a3205
commit abfd799
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Showing 4 changed files with 41 additions and 9 deletions.
diff --git a/src/core/qgsmaplayer.cpp b/src/core/qgsmaplayer.cpp
@@ -340,6 +340,17 @@ bool QgsMapLayer::writeXML( QDomNode & layer_node, QDomDocument & document )
 
   maplayer.appendChild( layerName );
 
+  // timestamp if supported
+  if ( timestamp() > QDateTime() )
+  {
+    QDomElement stamp = document.createElement( "timestamp" );
+    QDomText stampText = document.createTextNode( timestamp().toString( Qt::ISODate ) );
+    stamp.appendChild( stampText );
+    maplayer.appendChild( stamp );
+  }
+
+  maplayer.appendChild( layerName );
+
   // zorder
   // This is no longer stored in the project file. It is superfluous since the layers
   // are written and read in the proper order.

diff --git a/src/core/qgsmaplayer.h b/src/core/qgsmaplayer.h
@@ -19,7 +19,7 @@
 #ifndef QGSMAPLAYER_H
 #define QGSMAPLAYER_H
 
-
+#include <QDateTime>
 #include <QObject>
 #include <QUndoStack>
 #include <QVariant>
@@ -95,7 +95,7 @@ class CORE_EXPORT QgsMapLayer : public QObject
     /** This is the method that does the actual work of
      * drawing the layer onto a paint device.
      * @param rendererContext describes the extents,
-     * resolution etc. that should be used when rendering the
+     * resolumon etc. that should be used when rendering the
      * layer.
      */
     virtual bool draw( QgsRenderContext& rendererContext );
@@ -332,6 +332,9 @@ class CORE_EXPORT QgsMapLayer : public QObject
      * added in 1.5 */
     void clearCacheImage();
 
+    /** Time stamp of data source in the moment when data/metadata were loaded by provider */
+    virtual QDateTime timestamp() const { return QDateTime() ; }
+
   signals:
 
     /** Emit a signal to notify of a progress event */

diff --git a/src/core/raster/qgsrasterlayer.cpp b/src/core/raster/qgsrasterlayer.cpp
@@ -3257,9 +3257,8 @@ bool QgsRasterLayer::readXml( QDomNode & layer_node )
   QDomNode rpNode = layer_node.namedItem( "rasterproperties" );
 
   // Collect sublayer names and styles
-  QStringList layers;
-  QStringList styles;
-  QString format;
+  mLayers.clear();
+  mStyles.clear();
 
   if ( mProviderKey == "wms" )
   {
@@ -3269,20 +3268,21 @@ bool QgsRasterLayer::readXml( QDomNode & layer_node )
       // TODO: sublayer visibility - post-0.8 release timeframe
 
       // collect name for the sublayer
-      layers += layerElement.namedItem( "name" ).toElement().text();
+      mLayers += layerElement.namedItem( "name" ).toElement().text();
 
       // collect style for the sublayer
-      styles += layerElement.namedItem( "style" ).toElement().text();
+      mStyles += layerElement.namedItem( "style" ).toElement().text();
 
       layerElement = layerElement.nextSiblingElement( "wmsSublayer" );
     }
 
     // Collect format
-    format = rpNode.namedItem( "wmsFormat" ).toElement().text();
+    mFormat = rpNode.namedItem( "wmsFormat" ).toElement().text();
   }
 
+  mCrs = crs().authid();
   // Collect CRS
-  setDataProvider( mProviderKey, layers, styles, format, crs().authid() );
+  setDataProvider( mProviderKey, mLayers, mStyles, mFormat, mCrs );
 
   QString theError;
   bool res = readSymbology( layer_node, theError );
@@ -3299,6 +3299,21 @@ bool QgsRasterLayer::readXml( QDomNode & layer_node )
     mGrayBandName = bandName( 1 );
   }
 
+  // Check timestamp
+  QDomNode stampNode = layer_node.namedItem( "timestamp" );
+  if ( !stampNode.isNull() )
+  {
+    QDateTime stamp = QDateTime::fromString( stampNode.toElement().text(), Qt::ISODate );
+    // TODO: very bad, we have to load twice!!! Make QgsDataProvider::timestamp() static?
+    if ( stamp < mDataProvider->dataTimestamp() )
+    {
+      QgsDebugMsg( "data changed, reload provider" );
+      closeDataProvider();
+      init();
+      setDataProvider( mProviderKey, mLayers, mStyles, mFormat, mCrs );
+    }
+  }
+
   return res;
 } // QgsRasterLayer::readXml( QDomNode & layer_node )
 

diff --git a/src/core/raster/qgsrasterlayer.h b/src/core/raster/qgsrasterlayer.h
@@ -658,6 +658,9 @@ class CORE_EXPORT QgsRasterLayer : public QgsMapLayer
      */
     virtual void setSubLayerVisibility( const QString & name, bool vis );
 
+    /** Time stamp of data source in the moment when data/metadata were loaded by provider */
+    virtual QDateTime timestamp() const { return mDataProvider->timestamp() ; }
+
   public slots:
     /** \brief Create GDAL pyramid overviews */
     QString buildPyramids( const RasterPyramidList &,