[gdml] Resolve material fractions by exact reference

geom/gdml/src/TGDMLParse.cxx

@@ -1310,7 +1310,6 @@ XMLNodePointer_t TGDMLParse::MatProcess(TXMLEngine *gdml, XMLNodePointer_t node,
    TGeoMixture *mix = nullptr;
    TGeoMaterial *mat = nullptr;
    TString tempconst = "";
-   TString matname;
    Bool_t composite = kFALSE;
 
    if (z == 1) {
@@ -1546,25 +1545,29 @@ XMLNodePointer_t TGDMLParse::MatProcess(TXMLEngine *gdml, XMLNodePointer_t node,
       Double_t weight;
 
       for (fractions f = fracmap.begin(); f != fracmap.end(); ++f) {
-         matname = f->first;
-         matname = NameShort(matname);
-
-         TGeoMaterial *mattmp = (TGeoMaterial *)gGeoManager->GetListOfMaterials()->FindObject(matname);
+         TGeoMaterial *mattmp = nullptr;
+         auto material = fmatmap.find(f->first);
+         if (material != fmatmap.end())
+            mattmp = (TGeoMaterial *)material->second;
+         else {
+            auto mixture = fmixmap.find(f->first);
+            if (mixture != fmixmap.end())
+               mattmp = (TGeoMixture *)mixture->second;
+         }
+         auto element = felemap.find(f->first);
 
-         if (mattmp || (felemap.find(f->first) != felemap.end())) {
+         if ((composite && element != felemap.end()) || (!composite && (mattmp || element != felemap.end()))) {
             if (composite) {
                natoms = (Int_t)f->second;
-
-               mix->AddElement(felemap[f->first], natoms);
-
+               mix->AddElement((TGeoElement *)element->second, natoms);
             }
 
             else {
                weight = f->second;
                if (mattmp) {
                   mix->AddElement(mattmp, weight);
                } else {
-                  mix->AddElement(felemap[f->first], weight);
+                  mix->AddElement((TGeoElement *)element->second, weight);
                }
             }
          }
@@ -1573,13 +1576,16 @@ XMLNodePointer_t TGDMLParse::MatProcess(TXMLEngine *gdml, XMLNodePointer_t node,
 
    medid = medid + 1;
 
+   if (mixflag == 1)
+      fmixmap[local_name.Data()] = mix;
+   else if (mixflag == 0)
+      fmatmap[local_name.Data()] = mat;
+
    TGeoMedium *med = mgr->GetMedium(NameShort(name));
    if (!med) {
       if (mixflag == 1) {
-         fmixmap[local_name.Data()] = mix;
          med = new TGeoMedium(NameShort(name), medid, mix);
       } else if (mixflag == 0) {
-         fmatmap[local_name.Data()] = mat;
          med = new TGeoMedium(NameShort(name), medid, mat);
       }
    } else if (gDebug >= 2) {

geom/test/CMakeLists.txt

@@ -6,9 +6,13 @@
 
 if(gdml)
   configure_file(no_extrusion.gdml no_extrusion.gdml COPYONLY)
+  configure_file(material_name_collision.gdml material_name_collision.gdml COPYONLY)
   ROOT_ADD_GTEST(material_units
     test_material_units.cxx
     LIBRARIES Geom)
+  ROOT_ADD_GTEST(gdml_material_name_collision
+    test_gdml_material_name_collision.cxx
+    LIBRARIES Geom)
   ROOT_ADD_GTEST(boolean_extrusion
     test_boolean_extrusion.cxx
     LIBRARIES Geom GeomChecker)

geom/test/material_name_collision.gdml

@@ -0,0 +1,25 @@
+<?xml version="1.0"?>
+<gdml xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
+  <define/>
+  <materials>
+    <element Z="26" formula="FE" name="Iron0xaaa"><atom unit="g/mole" value="55.845"/></element>
+    <element Z="28" formula="NI" name="Nickel0xbbb"><atom unit="g/mole" value="58.693"/></element>
+    <material name="Iron0xccc" state="solid">
+      <D unit="g/cm3" value="7.87"/><fraction n="1" ref="Iron0xaaa"/>
+    </material>
+    <material name="Alloy0xddd" state="solid">
+      <D unit="g/cm3" value="8.2"/>
+      <fraction n="0.5" ref="Iron0xaaa"/><fraction n="0.5" ref="Nickel0xbbb"/>
+    </material>
+  </materials>
+  <solids>
+    <box lunit="mm" name="world0x1a" x="1000" y="1000" z="1000"/>
+    <box lunit="mm" name="cube0x1b" x="100" y="100" z="100"/>
+  </solids>
+  <structure>
+    <volume name="ironVol0x2a"><materialref ref="Iron0xccc"/><solidref ref="cube0x1b"/></volume>
+    <volume name="World0x2c"><materialref ref="Alloy0xddd"/><solidref ref="world0x1a"/>
+      <physvol name="ironPV"><volumeref ref="ironVol0x2a"/></physvol></volume>
+  </structure>
+  <setup name="Default" version="1.0"><world ref="World0x2c"/></setup>
+</gdml>

geom/test/test_gdml_material_name_collision.cxx

@@ -0,0 +1,29 @@
+#include <gtest/gtest.h>
+
+#include <TGeoElement.h>
+#include <TGeoManager.h>
+#include <TGeoMaterial.h>
+
+TEST(Geometry, GDMLMaterialElementNameCollision)
+{
+   auto geom = TGeoManager::Import("material_name_collision.gdml");
+   ASSERT_NE(geom, nullptr);
+
+   auto iron = geom->GetMaterial("Iron");
+   ASSERT_NE(iron, nullptr);
+   ASSERT_TRUE(iron->IsMixture());
+   auto ironMixture = static_cast<TGeoMixture *>(iron);
+   ASSERT_EQ(iron->GetNelements(), 1);
+   EXPECT_STREQ(iron->GetElement(0)->GetName(), "FE");
+   EXPECT_DOUBLE_EQ(ironMixture->GetWmixt()[0], 1.0);
+
+   auto alloy = geom->GetMaterial("Alloy");
+   ASSERT_NE(alloy, nullptr);
+   ASSERT_TRUE(alloy->IsMixture());
+   auto alloyMixture = static_cast<TGeoMixture *>(alloy);
+   ASSERT_EQ(alloy->GetNelements(), 2);
+   EXPECT_STREQ(alloy->GetElement(0)->GetName(), "FE");
+   EXPECT_STREQ(alloy->GetElement(1)->GetName(), "NI");
+   EXPECT_DOUBLE_EQ(alloyMixture->GetWmixt()[0], 0.5);
+   EXPECT_DOUBLE_EQ(alloyMixture->GetWmixt()[1], 0.5);
+}