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diff --git a/bundles/org.simantics.acorn/src/org/simantics/acorn/internal/Change.java b/bundles/org.simantics.acorn/src/org/simantics/acorn/internal/Change.java
new file mode 100644
index 000000000..305e31537
--- /dev/null
+++ b/bundles/org.simantics.acorn/src/org/simantics/acorn/internal/Change.java
@@ -0,0 +1,70 @@
+package org.simantics.acorn.internal;
+
+import org.simantics.db.service.ClusterUID;
+
+final public class Change {
+    
+    byte op0;
+    int key0;
+    int key1;
+    int key2;
+    ClusterUID clusterUID1;
+    ClusterUID clusterUID2;
+    byte[] lookup1;
+    byte[] lookup2;
+    byte lookIndex1;
+    byte lookIndex2;
+    int lastArg = 0;
+
+    @Override
+    public String toString() {
+        return "Change " + (key0&0xffff) + " " + (key1&0xffff) + " " + (key2&0xffff) + " " + clusterUID2 + " " + clusterUID2;
+    }
+    
+    public final void init() {
+        lastArg = 0;
+    }
+
+    public final void initValue() {
+        lastArg = 0;
+    }
+
+    final void addStatementIndex0(int key, byte op) {
+        assert (op != 0);
+        key0 = key;
+        op0 = op;
+    }
+
+    final void addStatementIndex1(int key, ClusterUID clusterUID, byte lookIndex, byte[] lookup) {
+        key1 = key;
+        clusterUID1 = clusterUID;
+        lookIndex1 = lookIndex;
+        lookup1 = lookup;
+//        if(lookIndex > 0)
+//            System.err.println("statementIndex1 " + pos + " " + lookIndex);
+    }
+
+    final void addStatementIndex2(int key, ClusterUID clusterUID, byte lookIndex, byte[] lookup) {
+        key2 = key;
+        clusterUID2 = clusterUID;
+        lookIndex2 = lookIndex;
+        lookup2 = lookup;
+    }
+
+    final public void addStatementIndex(int key, ClusterUID clusterUID, byte op) {
+
+        // new Exception("lastArg=" + lastArg).printStackTrace();
+
+        assert (lastArg < 3);
+
+        if (0 == lastArg)
+            addStatementIndex0(key, op);
+        else if (1 == lastArg)
+            addStatementIndex1(key, clusterUID, (byte)0, null);
+        else if (2 == lastArg)
+            addStatementIndex2(key, clusterUID, (byte)0, null);
+
+        lastArg++;
+
+    }
+}