ENH: new encapsulation: dynamicCode, dynamicCodeContext

- improve loading/unloading characteristics for codedFixedValue
  but still needs work

src/OpenFOAM/db/dynamicLibrary/dynamicCode/dynamicCodeContext.C

@@ -0,0 +1,69 @@
+/*---------------------------------------------------------------------------*\
+  =========                 |
+  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
+   \\    /   O peration     |
+    \\  /    A nd           | Copyright (C) 2011-2011 OpenCFD Ltd.
+     \\/     M anipulation  |
+-------------------------------------------------------------------------------
+License
+    This file is part of OpenFOAM.
+
+    OpenFOAM 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 2 of the License, or (at your
+    option) any later version.
+
+    OpenFOAM 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 OpenFOAM; if not, write to the Free Software Foundation,
+    Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+
+\*---------------------------------------------------------------------------*/
+
+#include "dynamicCodeContext.H"
+#include "stringOps.H"
+#include "OSHA1stream.H"
+
+
+// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
+
+Foam::dynamicCodeContext::dynamicCodeContext(const dictionary& dict)
+:
+    dict_(dict),
+    code_(stringOps::trim(dict["code"])),
+    include_(),
+    options_()
+{
+    // expand dictionary entries
+    stringOps::inplaceExpand(code_, dict);
+
+    // note: removes any leading/trailing whitespace
+    // - necessary for compilation options, convenient for includes
+    // and body.
+
+    // optional
+    if (dict.found("codeInclude"))
+    {
+        include_ = stringOps::trim(dict["codeInclude"]);
+        stringOps::inplaceExpand(include_, dict);
+    }
+
+    // optional
+    if (dict.found("codeOptions"))
+    {
+        options_ = stringOps::trim(dict["codeOptions"]);
+        stringOps::inplaceExpand(options_, dict);
+    }
+
+    // calculate SHA1 digest from include, options, code
+    OSHA1stream os;
+    os  << include_ << options_ << code_;
+    sha1_ = os.digest();
+}
+
+
+// ************************************************************************* //