functions to get layer field and type from name

git-svn-id: http://svn.osgeo.org/qgis/trunk@4980 c8812cc2-4d05-0410-92ff-de0c093fc19c

src/providers/grass/qgsgrassprovider.cpp

@@ -101,30 +101,25 @@ QgsGrassProvider::QgsGrassProvider(QString const & uri)
         mLayerType = CENTROID;
 	mGrassType = GV_CENTROID;
     } else {
-	// Get field number
-	int pos = mLayer.find('_');
-
-	if ( pos == -1 ) {
+        mLayerField = grassLayer ( mLayer );
+        if ( mLayerField == -1 ) {
 	    std::cerr << "Invalid layer name, no underscore found: " << mLayer.toLocal8Bit().data() << std::endl;
 	    return;
-	}
-
-	mLayerField = mLayer.left(pos).toInt();
+        }
 
-	QString ts = mLayer.right( mLayer.length() - pos - 1 );
-	if ( ts.compare("point") == 0 ) {
+        mGrassType = grassLayerType ( mLayer );
+
+	if ( mGrassType == GV_POINT ) {
 	    mLayerType = POINT;
-	    mGrassType = GV_POINT; // ?! centroids may be points
-	} else if ( ts.compare("line") == 0 ) {
+	} else if ( mGrassType == GV_LINES ) {
 	    mLayerType = LINE;
-	    mGrassType = GV_LINE | GV_BOUNDARY; 
-	} else if ( ts.compare("polygon") == 0 ) {
+	} else if ( mGrassType == GV_AREA ) {
 	    mLayerType = POLYGON;
-	    mGrassType = GV_AREA; 
 	} else {
-	    std::cerr << "Invalid layer name, wrong type: " << ts.toLocal8Bit().data() << std::endl;
+	    std::cerr << "Invalid layer name, wrong type: " << mLayer.toLocal8Bit().data() << std::endl;
 	    return;
 	}
+
     }
     #ifdef QGISDEBUG
     std::cerr << "mLayerField: " << mLayerField << std::endl;
@@ -1273,6 +1268,38 @@ int QgsGrassProvider::grassLayer()
 	return mLayerField;
 }
 
+int QgsGrassProvider::grassLayer(QString name)
+{
+    // Get field number
+    int pos = name.find('_');
+
+    if ( pos == -1 ) {
+	return -1;
+    }
+
+    return name.left(pos).toInt();
+}
+
+int QgsGrassProvider::grassLayerType(QString name)
+{
+    int pos = name.find('_');
+
+    if ( pos == -1 ) {
+	return -1;
+    }
+
+    QString ts = name.right( name.length() - pos - 1 );
+    if ( ts.compare("point") == 0 ) {
+	return GV_POINT; // ?! centroids may be points
+    } else if ( ts.compare("line") == 0 ) {
+	return GV_LINES; 
+    } else if ( ts.compare("polygon") == 0 ) {
+	return GV_AREA; 
+    }
+
+    return -1;
+}
+
 //-----------------------------------------  Edit -------------------------------------------------------
 
 bool QgsGrassProvider::isGrassEditable ( void )

src/providers/grass/qgsgrassprovider.h

@@ -453,6 +453,15 @@ class QgsGrassProvider : public QgsVectorDataProvider
   /** Returns GRASS layer number */
   int grassLayer();
 
+  /** Returns GRASS layer number for given layer name or -1 if cannot 
+   *  get layer number
+   */
+  static int grassLayer(QString);
+
+  /** Returns GRASS layer type (GV_POINT, GV_LINES, GV_AREA) for 
+   *  given layer name or -1 if cannot get layer type
+   */
+  static int grassLayerType(QString);
 
     /** return a provider name