From c12d8c2e5daa05561023aae4ccdf9457efbe5e0c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Atgeirr=20Fl=C3=B8=20Rasmussen?= <atgeirr@sintef.no>
Date: Thu, 5 Jan 2012 09:34:05 +0100
Subject: [PATCH] Moved active phase determination into own function.

---
 .../fluid/blackoil/BlackoilPvtProperties.hpp  |  8 ++-
 .../fluid/blackoil/phaseUsageFromDeck.hpp     | 71 +++++++++++++++++++
 2 files changed, 76 insertions(+), 3 deletions(-)
 create mode 100644 opm/core/fluid/blackoil/phaseUsageFromDeck.hpp

diff --git a/opm/core/fluid/blackoil/BlackoilPvtProperties.hpp b/opm/core/fluid/blackoil/BlackoilPvtProperties.hpp
index 680f65481..fbb744d4e 100644
--- a/opm/core/fluid/blackoil/BlackoilPvtProperties.hpp
+++ b/opm/core/fluid/blackoil/BlackoilPvtProperties.hpp
@@ -43,6 +43,10 @@ namespace Opm
     class BlackoilPvtProperties : public BlackoilPhases
     {
     public:
+        /// Default constructor.
+        BlackoilPvtProperties();
+
+        /// Initialize from deck.
 	void init(const Dune::EclipseGridParser& deck);
 
         /// Number of active phases.
@@ -99,9 +103,7 @@ namespace Opm
         BlackoilPvtProperties(const BlackoilPvtProperties&);
         BlackoilPvtProperties& operator=(const BlackoilPvtProperties&);
 
-        int num_phases_;
-        int phase_used_[MaxNumPhases];
-        int phase_pos_[MaxNumPhases];
+        PhaseUsage phase_usage_;
 
 	int region_number_;
 
diff --git a/opm/core/fluid/blackoil/phaseUsageFromDeck.hpp b/opm/core/fluid/blackoil/phaseUsageFromDeck.hpp
new file mode 100644
index 000000000..910f38ba1
--- /dev/null
+++ b/opm/core/fluid/blackoil/phaseUsageFromDeck.hpp
@@ -0,0 +1,71 @@
+/*
+  Copyright 2012 SINTEF ICT, Applied Mathematics.
+
+  This file is part of the Open Porous Media project (OPM).
+
+  OPM is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  OPM is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with OPM.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef OPM_PHASEUSAGEFROMDECK_HEADER_INCLUDED
+#define OPM_PHASEUSAGEFROMDECK_HEADER_INCLUDED
+
+
+#include <opm/core/eclipse/EclipseGridParser.hpp>
+#include <opm/core/fluid/blackoil/BlackoilPhases.hpp>
+
+
+namespace Opm
+{
+
+
+    /// Looks at presence of WATER, OIL and GAS keywords in deck
+    /// to determine active phases.
+    PhaseUsage phaseUsageFromDeck(const Dune::EclipseGridParser& deck)
+    {
+        PhaseUsage pu;
+        std::fill(pu.phase_used, pu.phase_used + BlackoilPhases::MaxNumPhases, 0);
+
+        // Discover phase usage.
+        if (deck.hasField("WATER")) {
+            pu.phase_used[BlackoilPhases::Aqua] = 1;
+        }
+        if (deck.hasField("OIL")) {
+            pu.phase_used[BlackoilPhases::Liquid] = 1;
+        }
+        if (deck.hasField("GAS")) {
+            pu.phase_used[BlackoilPhases::Vapour] = 1;
+        }
+        pu.num_phases = 0;
+        for (int i = 0; i < BlackoilPhases::MaxNumPhases; ++i) {
+            pu.phase_pos[i] = pu.num_phases;
+            pu.num_phases += pu.phase_used[i];
+        }
+
+        // Only 2 or 3 phase systems handled.
+        if (pu.num_phases < 2 || pu.num_phases > 3) {
+            THROW("Cannot handle cases with " << pu.num_phases << " phases.");
+        }
+
+        // We need oil systems, since we do not support the keywords needed for
+        // water-gas systems.
+        if (!pu.phase_used[BlackoilPhases::Liquid]) {
+            THROW("Cannot handle cases with no OIL, i.e. water-gas systems.");
+        }
+
+        return pu;
+    }
+
+}
+
+#endif // OPM_PHASEUSAGEFROMDECK_HEADER_INCLUDED