1 files changed, 60 insertions, 0 deletions
diff --git a/src/main/java/au/id/zancanaro/javacheck/statem/CommandValue.java b/src/main/java/au/id/zancanaro/javacheck/statem/CommandValue.java
new file mode 100644
index 0000000..0a1fb61
--- /dev/null
+++ b/src/main/java/au/id/zancanaro/javacheck/statem/CommandValue.java
@@ -0,0 +1,60 @@
+package au.id.zancanaro.javacheck.statem;
+
+import java.util.Map;
+import java.util.NoSuchElementException;
+
+public abstract class CommandValue<T> {
+    private final int id;
+
+    public CommandValue(int id) {
+        this.id = id;
+    }
+
+    public abstract boolean isAbstract();
+
+    public abstract T get();
+
+    public int getId() {
+        return id;
+    }
+
+    static class AbstractValue<T> extends CommandValue<T> {
+        public AbstractValue(int id) {
+            super(id);
+        }
+
+        @Override
+        public boolean isAbstract() {
+            return true;
+        }
+
+        @Override
+        public T get() {
+            throw new NoSuchElementException("Abstract values cannot be supplied");
+        }
+    }
+
+    static class ConcreteValue<T> extends CommandValue<T> {
+        private final Map<Integer, Object> values;
+
+        public ConcreteValue(int id, Map<Integer, Object> values) {
+            super(id);
+            this.values = values;
+        }
+
+        @Override
+        public boolean isAbstract() {
+            return true;
+        }
+
+        @Override
+        @SuppressWarnings("unchecked")
+        public T get() {
+            if (values.containsKey(getId())) {
+                return (T) values.get(getId());
+            } else {
+                throw new NoSuchElementException("Concrete values cannot be supplied prior to being calculated");
+            }
+        }
+    }
+}