Implement Variable.

State can now be edited with Variable objects.

3 files changed, 75 insertions, 0 deletions

diff --git a/same/src/main/java/com/orbekk/same/SameController.java b/same/src/main/java/com/orbekk/same/SameController.java
index 8cc37fe..58dfc6f 100644
--- a/same/src/main/java/com/orbekk/same/SameController.java
+++ b/same/src/main/java/com/orbekk/same/SameController.java
@@ -148,4 +148,8 @@ public class SameController {
     public Master getMaster() {
         return master;
     }
+    
+    public VariableFactory createVariableFactory() {
+        return new VariableFactory(client.getInterface());
+    }
 }
diff --git a/same/src/main/java/com/orbekk/same/Variable.java b/same/src/main/java/com/orbekk/same/Variable.java
new file mode 100644
index 0000000..63f8063
--- /dev/null
+++ b/same/src/main/java/com/orbekk/same/Variable.java
@@ -0,0 +1,17 @@
+package com.orbekk.same;
+
+public interface Variable<T> {
+    public interface OnChangeListener<T> {
+        /**
+         * A notification that 'variable' has been changed.
+         * 
+         * The user must run variable.update() to get the updated value.
+         */
+        void valueChanged(Variable<T> variable);
+    }
+    
+    T get();
+    void set(T value);
+    void update();
+    void setOnChangeListener(OnChangeListener<T> listener);
+}
diff --git a/same/src/main/java/com/orbekk/same/VariableFactory.java b/same/src/main/java/com/orbekk/same/VariableFactory.java
new file mode 100644
index 0000000..81b7615
--- /dev/null
+++ b/same/src/main/java/com/orbekk/same/VariableFactory.java
@@ -0,0 +1,54 @@
+package com.orbekk.same;
+
+import org.codehaus.jackson.type.TypeReference;
+
+/**
+ * TODO: Use WeakReference in order to make variables GC-able.
+ */
+public class VariableFactory {
+    Client.ClientInterface client;
+    
+    private class VariableImpl<T> implements Variable<T> {
+        String identifier;
+        TypeReference<T> type;
+        T value;
+    
+        public VariableImpl(String identifier, TypeReference<T> type) {
+            this.identifier = identifier;
+            this.type = type;
+        }
+
+        @Override
+        public T get() {
+            return value;
+        }
+
+        @Override
+        public void set(T value) {
+        }
+
+        @Override
+        public void update() {
+            value = client.getState().getParsedData(identifier, type);
+        }
+
+        @Override
+        public void setOnChangeListener(Variable.OnChangeListener<T> listener) {
+            throw new RuntimeException("Not implemented.");
+        }
+    }
+    
+    public static VariableFactory create(Client.ClientInterface client) {
+        return new VariableFactory(client);
+    }
+    
+    VariableFactory(Client.ClientInterface client) {
+        this.client = client;
+    }
+    
+    public <T> Variable<T> create(String identifier, TypeReference<T> type) {
+        Variable<T> variable = new VariableImpl<T>(identifier, type);
+        variable.update();
+        return variable;
+    }
+}