1 files changed, 44 insertions, 0 deletions

diff --git a/store/src/main/java/org/eclipse/viatra/solver/data/model/representation/TruthValue.java b/store/src/main/java/org/eclipse/viatra/solver/data/model/representation/TruthValue.java
new file mode 100644
index 00000000..aeccde9e
--- /dev/null
+++ b/store/src/main/java/org/eclipse/viatra/solver/data/model/representation/TruthValue.java
@@ -0,0 +1,44 @@
+package org.eclipse.viatra.solver.data.model.representation;
+
+public class TruthValue {
+        public static final TruthValue True = new TruthValue("true");
+        public static final TruthValue False = new TruthValue("false");
+        public static final TruthValue Unknown = new TruthValue("unknown");
+        public static final TruthValue Error = new TruthValue("error");
+        
+        private final String name;
+        protected TruthValue(String name) {
+                this.name = name;
+        }
+        
+        public String getName() {
+                return name;
+        }
+        
+        public static TruthValue toTruthValue(boolean value) {
+                if(value) return True;
+                else return False;
+        }
+        public boolean isConsistent() {
+                return this != Error;
+        }
+        public boolean isComplete() {
+                return this != Unknown;
+        }
+        public boolean must() {
+                return this == True || this == Error;
+        }
+        public boolean may() {
+                return this == True || this == Unknown;
+        }
+        
+        public TruthValue not() {
+                if(this == True) {
+                        return False;
+                } else if(this == False) {
+                        return True;
+                } else {
+                        return this;
+                }
+        }
+}