1 files changed, 264 insertions, 0 deletions
diff --git a/src/com/isode/stroke/whiteboard/WhiteboardTransformer.java b/src/com/isode/stroke/whiteboard/WhiteboardTransformer.java
new file mode 100644
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--- /dev/null
+++ b/src/com/isode/stroke/whiteboard/WhiteboardTransformer.java
@@ -0,0 +1,264 @@
+/*  Copyright (c) 2016, Isode Limited, London, England.
+ *  All rights reserved.
+ *
+ *  Acquisition and use of this software and related materials for any
+ *  purpose requires a written license agreement from Isode Limited,
+ *  or a written license from an organisation licensed by Isode Limited
+ *  to grant such a license.
+ *
+ */
+package com.isode.stroke.whiteboard;
+
+import com.isode.stroke.elements.WhiteboardDeleteOperation;
+import com.isode.stroke.elements.WhiteboardInsertOperation;
+import com.isode.stroke.elements.WhiteboardOperation;
+import com.isode.stroke.elements.WhiteboardUpdateOperation;
+
+public final class WhiteboardTransformer {
+
+    public static final class Pair {
+        public final WhiteboardOperation first;
+        public final WhiteboardOperation second;
+        public Pair(WhiteboardOperation first,WhiteboardOperation second) {
+            this.first = first;
+            this.second = second;
+        }
+        public Pair() {
+            this(new WhiteboardOperation(),new WhiteboardOperation());
+        }
+    }
+    
+    private WhiteboardTransformer() {
+        // Static class so constructor is private
+    }
+    
+    public static Pair transform(WhiteboardOperation clientOp,WhiteboardOperation serverOp) {
+        if (clientOp instanceof WhiteboardInsertOperation) {
+            WhiteboardInsertOperation clientInsert = (WhiteboardInsertOperation) clientOp;
+            if (serverOp instanceof WhiteboardInsertOperation) {
+                WhiteboardInsertOperation serverInsert = (WhiteboardInsertOperation) serverOp;
+                return transform(clientInsert, serverInsert);
+            }
+            else if (serverOp instanceof WhiteboardUpdateOperation) {
+                WhiteboardUpdateOperation serverUpdate = (WhiteboardUpdateOperation) serverOp;
+                return transform(clientInsert, serverUpdate);
+            }
+            else if (serverOp instanceof WhiteboardDeleteOperation) {
+                WhiteboardDeleteOperation serverDelete = (WhiteboardDeleteOperation) serverOp;
+                return transform(clientInsert, serverDelete);
+            }
+        }
+        else if (clientOp instanceof WhiteboardUpdateOperation) {
+            WhiteboardUpdateOperation clientUpdate = (WhiteboardUpdateOperation) clientOp;
+            if (serverOp instanceof WhiteboardInsertOperation) {
+                WhiteboardInsertOperation serverInsert = (WhiteboardInsertOperation) serverOp;
+                return transform(clientUpdate, serverInsert);
+            }
+            else if (serverOp instanceof WhiteboardUpdateOperation) {
+                WhiteboardUpdateOperation serverUpdate = (WhiteboardUpdateOperation) serverOp;
+                return transform(clientUpdate, serverUpdate);
+            }
+            else if (serverOp instanceof WhiteboardDeleteOperation) {
+                WhiteboardDeleteOperation serverDelete = (WhiteboardDeleteOperation) serverOp;
+                return transform(clientUpdate, serverDelete);
+            }
+        }
+        else if (clientOp instanceof WhiteboardDeleteOperation) {
+            WhiteboardDeleteOperation clientDelete = (WhiteboardDeleteOperation) clientOp;
+            if (serverOp instanceof WhiteboardInsertOperation) {
+                WhiteboardInsertOperation serverInsert = (WhiteboardInsertOperation) serverOp;
+                return transform(clientDelete, serverInsert);
+            }
+            else if (serverOp instanceof WhiteboardUpdateOperation) {
+                WhiteboardUpdateOperation serverUpdate = (WhiteboardUpdateOperation) serverOp;
+                return transform(clientDelete, serverUpdate);
+            }
+            else if (serverOp instanceof WhiteboardDeleteOperation) {
+                WhiteboardDeleteOperation serverDelete = (WhiteboardDeleteOperation) serverOp;
+                return transform(clientDelete, serverDelete);
+            }
+        }
+        return new Pair();
+    }
+    
+    public static Pair transform(WhiteboardInsertOperation clientOp,WhiteboardInsertOperation serverOp) {
+        WhiteboardInsertOperation first = new WhiteboardInsertOperation(serverOp);
+        first.setParentID(clientOp.getID());
+        WhiteboardInsertOperation second = new WhiteboardInsertOperation(clientOp);
+        second.setParentID(serverOp.getID());
+        if (clientOp.getPos() <= serverOp.getPos()) {
+            first.setPos(first.getPos()+1);
+        }
+        else {
+            second.setPos(second.getPos()+1);
+        }
+        return new Pair(first,second);
+    }
+    
+    public static Pair transform(WhiteboardUpdateOperation clientOp,WhiteboardUpdateOperation serverOp) {
+
+        WhiteboardUpdateOperation first = new WhiteboardUpdateOperation(serverOp);
+        first.setParentID(clientOp.getID());
+        
+        WhiteboardUpdateOperation second;
+        if (clientOp.getPos() == serverOp.getPos()) {
+            second = new WhiteboardUpdateOperation(serverOp);
+            second.setID(clientOp.getID());
+            second.setParentID(serverOp.getID());
+        }
+        else {
+            second = new WhiteboardUpdateOperation(clientOp);
+            second.setParentID(serverOp.getID());
+        }
+        
+        if (clientOp.getPos() < serverOp.getPos() && clientOp.getNewPos() > serverOp.getPos()) {
+            first.setPos(first.getPos()-1);
+            if (clientOp.getNewPos() >= serverOp.getNewPos()) {
+                first.setNewPos(first.getNewPos()-1);
+            }
+        }
+        else if (clientOp.getNewPos() >= serverOp.getNewPos()) {
+            first.setNewPos(first.getNewPos()-1);
+        }
+        if (serverOp.getPos() < clientOp.getPos() && serverOp.getNewPos() > clientOp.getPos()) {
+            second.setPos(second.getPos()-1);
+            if (serverOp.getNewPos() >= clientOp.getNewPos()) {
+                second.setNewPos(second.getNewPos()-1);
+            }
+        }
+        else if (serverOp.getNewPos() >= clientOp.getNewPos()) {
+            second.setNewPos(second.getNewPos()-1);
+        }
+        return new Pair(first,second);
+    }
+    
+    public static Pair transform(WhiteboardUpdateOperation clientOp,WhiteboardInsertOperation serverOp) {
+        WhiteboardInsertOperation first = new WhiteboardInsertOperation(serverOp);
+        first.setParentID(clientOp.getID());
+        WhiteboardUpdateOperation second = new WhiteboardUpdateOperation(clientOp);
+        second.setParentID(serverOp.getID());
+        if (serverOp.getPos() <= clientOp.getPos()) {
+            second.setPos(second.getPos()+1);
+        }
+        return new Pair(first, second);
+    }
+    
+    public static Pair transform(WhiteboardInsertOperation clientOp,WhiteboardUpdateOperation serverOp) {
+        WhiteboardUpdateOperation first = new WhiteboardUpdateOperation(serverOp);
+        first.setParentID(clientOp.getID());
+        WhiteboardInsertOperation second = new WhiteboardInsertOperation(clientOp);
+        second.setParentID(serverOp.getID());
+        if (serverOp.getPos() >= clientOp.getPos()) {
+            first.setPos(first.getPos()+1);
+        }
+        return new Pair(first,second);
+    }
+    
+    public static Pair transform(WhiteboardDeleteOperation clientOp, WhiteboardDeleteOperation serverOp) {
+          WhiteboardDeleteOperation first = new WhiteboardDeleteOperation(serverOp);
+          first.setParentID(clientOp.getID());
+          WhiteboardDeleteOperation second = new WhiteboardDeleteOperation(clientOp);
+          second.setParentID(serverOp.getID());
+          if (clientOp.getPos() == -1) {
+              second.setPos(-1);
+          }
+          if (serverOp.getPos() == -1) {
+              first.setPos(-1);
+          }
+          if (clientOp.getPos() < serverOp.getPos()) {
+              first.setPos(first.getPos()-1);
+          }
+          else if (clientOp.getPos() > serverOp.getPos()) {
+              second.setPos(second.getPos()-1);
+          }
+          else {
+              first.setPos(-1);
+              second.setPos(-1);
+          }
+          return new Pair(first, second);
+    }
+    
+    public static Pair transform(WhiteboardInsertOperation clientOp, WhiteboardDeleteOperation serverOp) {
+        WhiteboardDeleteOperation first = new WhiteboardDeleteOperation(serverOp);
+        first.setParentID(clientOp.getID());
+        WhiteboardInsertOperation second = new WhiteboardInsertOperation(clientOp);
+        second.setParentID(serverOp.getID());
+        if (clientOp.getPos() <= serverOp.getPos()) {
+            first.setPos(first.getPos()+1);
+        }
+        else if (serverOp.getPos() != -1) {
+            second.setPos(second.getPos()-1);
+        }
+        return new Pair(first, second);
+    }
+    
+    public static Pair transform(WhiteboardDeleteOperation clientOp, WhiteboardInsertOperation serverOp) {
+        WhiteboardInsertOperation first = new WhiteboardInsertOperation(serverOp);
+        first.setParentID(clientOp.getID());
+        WhiteboardDeleteOperation second = new WhiteboardDeleteOperation(clientOp);
+        second.setParentID(serverOp.getID());
+        if (serverOp.getPos() <= clientOp.getPos()) {
+            second.setPos(second.getPos()+1);
+        }
+        else if (clientOp.getPos() != -1) {
+            first.setPos(first.getPos()-1);
+        }
+        return new Pair(first, second);
+    }
+    
+    public static Pair transform(WhiteboardUpdateOperation clientOp, WhiteboardDeleteOperation serverOp) {
+        WhiteboardDeleteOperation first = new WhiteboardDeleteOperation(serverOp);
+        first.setParentID(clientOp.getID());
+        WhiteboardUpdateOperation updateOp = new WhiteboardUpdateOperation(clientOp);;
+        WhiteboardOperation second = updateOp;
+        second.setParentID(serverOp.getID());
+        if (clientOp.getPos() == serverOp.getPos()) {
+            WhiteboardDeleteOperation deleteOp = new WhiteboardDeleteOperation();
+            second = deleteOp;
+            second.setPos(-1);
+            second.setID(clientOp.getID());
+            second.setParentID(serverOp.getID());
+            deleteOp.setElementID(serverOp.getElementID());
+        }
+        else if (clientOp.getPos() > serverOp.getPos() && clientOp.getNewPos() <= serverOp.getPos()) {
+            second.setPos(second.getPos()-1);
+        }
+        else if (clientOp.getPos() < serverOp.getPos() && clientOp.getNewPos() >= serverOp.getPos()) {
+            updateOp.setNewPos(updateOp.getNewPos()-1);
+        }
+        else if (clientOp.getPos() > serverOp.getPos()) {
+            second.setPos(second.getPos() - 1);
+            updateOp.setNewPos(updateOp.getNewPos()-1);
+        }
+        return new Pair(first, second);
+    }
+    
+    public static Pair transform(WhiteboardDeleteOperation clientOp, WhiteboardUpdateOperation serverOp) {
+        WhiteboardUpdateOperation updateOp = new WhiteboardUpdateOperation(serverOp);
+        WhiteboardOperation first = updateOp;
+        first.setParentID(clientOp.getID());
+        WhiteboardDeleteOperation second = new WhiteboardDeleteOperation(clientOp);
+        second.setParentID(serverOp.getID());
+        if (clientOp.getPos() == serverOp.getPos()) {
+            WhiteboardDeleteOperation deleteOp = new WhiteboardDeleteOperation();
+            first = deleteOp;
+            first.setPos(-1);
+            first.setID(serverOp.getID());
+            first.setParentID(clientOp.getID());
+            deleteOp.setElementID(clientOp.getElementID());
+        }
+        else if (clientOp.getPos() < serverOp.getPos() && clientOp.getPos() >= serverOp.getNewPos()) {
+            first.setPos(first.getPos()-1);
+        }
+        else if (clientOp.getPos() > serverOp.getPos() && clientOp.getPos() <= serverOp.getNewPos()) {
+            updateOp.setNewPos(updateOp.getNewPos()-1);
+        }
+        else if (clientOp.getPos() < serverOp.getPos()) {
+            first.setPos(first.getPos()-1);
+            updateOp.setNewPos(updateOp.getNewPos()-1);
+        }
+        return new Pair(first, second);
+    }
+    
+
+}