1 files changed, 100 insertions, 0 deletions
diff --git a/xmloff/source/text/XMLPropertyBackpatcher.hxx b/xmloff/source/text/XMLPropertyBackpatcher.hxx
new file mode 100644
index 000000000..10165c488
--- /dev/null
+++ b/xmloff/source/text/XMLPropertyBackpatcher.hxx
@@ -0,0 +1,100 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * 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 .
+ */
+
+
+#ifndef INCLUDED_XMLOFF_SOURCE_TEXT_XMLPROPERTYBACKPATCHER_HXX
+#define INCLUDED_XMLOFF_SOURCE_TEXT_XMLPROPERTYBACKPATCHER_HXX
+
+#include <rtl/ustring.hxx>
+
+#include <map>
+#include <memory>
+#include <vector>
+
+namespace com::sun::star {
+    namespace beans { class XPropertySet; }
+    namespace uno { template<class A> class Reference; }
+}
+
+
+/** This class maintains an OUString->sal_Int16 mapping for cases in
+ * which an XPropertySet needs to be filled with values that are not
+ * yet known.
+ *
+ * A good example for appropriate use are footnotes and references to
+ * footnotes. Internally, the LibreOffice API numbers footnotes, and
+ * references to footnotes refer to that internal numbering. In the
+ * XML file format, these numbers are replaced with name strings. Now
+ * if during import of a document a reference to a footnote is
+ * encountered, two things can happen: 1) The footnote already
+ * appeared in the document. In this case the name is already known
+ * and the proper ID can be requested from the footnote. 2) The
+ * footnote will appear later in the document. In this case the ID is
+ * not yet known, and the reference-ID property of the reference
+ * cannot be determined. Hence, the reference has to be stored and the
+ * ID needs to bet set later, when the footnote is eventually found in
+ * the document.
+ *
+ * This class simplifies this process: If the footnote is found,
+ * ResolveId with the XML name and the ID is called. When a reference
+ * is encountered, SetProperty gets called with the reference's
+ * XPropertySet and the XML name. All remaining tasks are handled by
+ * the class.
+ */
+template <class A>
+class XMLPropertyBackpatcher
+{
+
+    /// name of property that gets set or backpatched
+     OUString sPropertyName;
+
+    /// backpatch list type
+    typedef ::std::vector<
+                css::uno::Reference<css::beans::XPropertySet> > BackpatchListType;
+
+    /// backpatch list for unresolved IDs
+    ::std::map<const OUString, std::unique_ptr<BackpatchListType>> aBackpatchListMap;
+
+    /// mapping of names -> IDs
+    ::std::map<const OUString, A> aIDMap;
+
+public:
+
+    explicit XMLPropertyBackpatcher(
+        const OUString& sPropertyName);
+
+    ~XMLPropertyBackpatcher();
+
+    /// resolve a known ID.
+    /// Call this as soon as the value for a particular name is known.
+    void ResolveId(
+        const OUString& sName,
+        A aValue);
+
+    /// Set property with the proper value for this name. If the value
+    /// is not yet known, store the XPropertySet in the backpatch list.
+    /// Use this whenever the value should be set, even if it is not yet known.
+    void SetProperty(
+        const css::uno::Reference<css::beans::XPropertySet> & xPropSet,
+        const OUString& sName);
+};
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */