Add MSF plugins

examples/msf/SolverFoundation.Plugin.Z3/Z3BaseDirective.cs

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+using System;
+using System.Text;
+using Microsoft.SolverFoundation.Services;
+
+namespace Microsoft.SolverFoundation.Plugin.Z3
+{
+    /// <summary>
+    /// Combining objective functions
+    /// </summary>
+    public enum OptimizationKind
+    {
+        Lexicographic,
+        BoundingBox,
+        ParetoOptimal
+    };
+
+    /// <summary>
+    /// Algorithm for solving cardinality constraints
+    /// </summary>
+    public enum CardinalityAlgorithm
+    { 
+        FuMalik,
+        CoreMaxSAT
+    }
+
+    /// <summary>
+    /// Algorithm for solving pseudo-boolean constraints
+    /// </summary>
+    public enum PseudoBooleanAlgorithm
+    { 
+        WeightedMaxSAT,
+        IterativeWeightedMaxSAT,
+        BisectionWeightedMaxSAT,
+        WeightedPartialMaxSAT2
+    }
+
+    /// <summary>
+    /// Strategy for solving arithmetic optimization
+    /// </summary>
+    public enum ArithmeticStrategy
+    { 
+        Basic,
+        Farkas
+    }
+
+    public abstract class Z3BaseDirective : Directive
+    {
+        protected OptimizationKind _optKind;
+        protected CardinalityAlgorithm _cardAlgorithm;
+        protected PseudoBooleanAlgorithm _pboAlgorithm;
+        protected ArithmeticStrategy _arithStrategy;
+
+        protected string _smt2LogFile;
+
+        public Z3BaseDirective()
+        {
+            Arithmetic = Arithmetic.Exact;
+        }
+
+        public OptimizationKind OptKind
+        {
+            get { return _optKind; }
+            set { _optKind = value; }
+        }
+
+        public CardinalityAlgorithm CardinalityAlgorithm
+        {
+            get { return _cardAlgorithm; }
+            set { _cardAlgorithm = value; }
+        }
+
+        public PseudoBooleanAlgorithm PseudoBooleanAlgorithm
+        {
+            get { return _pboAlgorithm; }
+            set { _pboAlgorithm = value; }
+        }
+
+        public ArithmeticStrategy ArithmeticStrategy
+        {
+            get { return _arithStrategy; }
+            set { _arithStrategy = value; }
+        }
+
+        public string SMT2LogFile
+        {
+            get { return _smt2LogFile; }
+            set { _smt2LogFile = value; }
+        }
+
+        public override string ToString() 
+        {
+            var sb = new StringBuilder();
+            sb.Append(this.GetType().Name);
+            sb.Append("(");
+            sb.AppendFormat("OptKind: {0}, ", _optKind);
+            sb.AppendFormat("SMT2LogFile: {0}", _smt2LogFile);
+            sb.Append(")");
+            return sb.ToString();
+        }
+    }
+}