1 files changed, 96 insertions, 0 deletions
diff --git a/xmerge/source/xmerge/java/org/openoffice/xmerge/merger/diff/CellNodeIterator.java b/xmerge/source/xmerge/java/org/openoffice/xmerge/merger/diff/CellNodeIterator.java
new file mode 100644
index 000000000..791c809f9
--- /dev/null
+++ b/xmerge/source/xmerge/java/org/openoffice/xmerge/merger/diff/CellNodeIterator.java
@@ -0,0 +1,96 @@
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+package org.openoffice.xmerge.merger.diff;
+
+import org.w3c.dom.Node;
+import org.w3c.dom.Element;
+
+import org.openoffice.xmerge.ConverterCapabilities;
+import org.openoffice.xmerge.converter.xml.OfficeConstants;
+
+/**
+ * This is an implementations of the {@code Iterator} interface.
+ *
+ * <p>It will traverse the tree and find cell {@code Node} sequences.</p>
+ *
+ * <p>Note: Once the XML Tree is parsed, then the {@code Iterator} will be a
+ * snapshot of that tree. That means even the tree is modified later, then the
+ * cached paragraph {@code Node} list will not be updated accordingly.  For this
+ * reason and for performance reasons this {@code Iterator} does not support any
+ * operation methods such as insert, remove or replace. The main purpose of this
+ * {@code Iterator} is to be used with difference, not with merge.</p>
+ */
+public final class CellNodeIterator extends NodeIterator  {
+
+    // can be expanded to an array in the future, not necessary right now
+    private static final String SUPPORTED_TAG1 = OfficeConstants.TAG_TABLE_CELL;
+
+    /**
+     * The standard constructor.
+     *
+     * @param  cc    The {@code ConverterCapabilities}.
+     * @param  node  The initial root {@code Node}.
+     */
+    public CellNodeIterator(ConverterCapabilities cc, Node node) {
+        super(cc, node);
+    }
+
+    /**
+     * Overwrite the parent {@code nodeSupported} method.
+     *
+     * <p>Only cell {@code Node} objects are supported.</p>
+     *
+     * @param   node  The {@code Node} to check.
+     *
+     * @return  {@code true} if the {@code Node} is supported, {@code false}
+     *          otherwise.
+     */
+    @Override
+    protected boolean nodeSupported(Node node) {
+
+        // can use an array later to check all possible tags for
+        // future expansion
+        return node.getNodeType() == Node.ELEMENT_NODE &&
+                node.getNodeName().equals(SUPPORTED_TAG1);
+    }
+
+    @Override
+    protected boolean childrenEqual(Node node1, Node node2) {
+
+        boolean equal = false;
+
+        if (node1.hasChildNodes() && node2.hasChildNodes()) {
+            Element cell1 = (Element)node1;
+            Element cell2 = (Element)node2;
+
+            // only need compare the first <text:p> children node, don't want
+            // to compare any non-supported features
+            // TODO: need to confirm whether all the text string is the
+            // first <text:p>, though I checked with the openoffice 619 build
+            Node paraNode1 = cell1.getElementsByTagName(
+                            OfficeConstants.TAG_PARAGRAPH).item(0);
+            Node paraNode2 = cell2.getElementsByTagName(
+                            OfficeConstants.TAG_PARAGRAPH).item(0);
+
+            equal = super.compareNode(paraNode1, paraNode2);
+        }
+
+        return equal;
+    }
+}