Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.scl.runtime / src / org / simantics / scl / runtime / equations / EquationContext.java

diff --git a/bundles/org.simantics.scl.runtime/src/org/simantics/scl/runtime/equations/EquationContext.java b/bundles/org.simantics.scl.runtime/src/org/simantics/scl/runtime/equations/EquationContext.java
new file mode 100644 (file)
index 0000000..f20dd6f
--- /dev/null
+++ b/bundles/org.simantics.scl.runtime/src/org/simantics/scl/runtime/equations/EquationContext.java
@@ -0,0 +1,20 @@
+package org.simantics.scl.runtime.equations;\r
+\r
+import org.simantics.scl.runtime.SCLContext;\r
+import org.simantics.scl.runtime.function.Function;\r
+import org.simantics.scl.runtime.tuple.Tuple0;\r
+\r
+public interface EquationContext {\r
+    void listenEquationVariable(String variableName, Function callback);\r
+    void setEquationVariable(String variableName, Object value);\r
+    \r
+    public static Object applyEquationContext(Function f, EquationContext equationContext) {\r
+        SCLContext context = SCLContext.getCurrent();\r
+        Object oldEquationContext = context.put("equation", equationContext);\r
+        try {\r
+            return f.apply(Tuple0.INSTANCE);\r
+        } finally {\r
+            context.put("equation", oldEquationContext);\r
+        }\r
+    }\r
+}\r