1 files changed, 174 insertions, 0 deletions
diff --git a/xmloff/source/core/unointerfacetouniqueidentifiermapper.cxx b/xmloff/source/core/unointerfacetouniqueidentifiermapper.cxx
new file mode 100644
index 000000000..d2e29422a
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+++ b/xmloff/source/core/unointerfacetouniqueidentifiermapper.cxx
@@ -0,0 +1,174 @@
+/* -*- 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 .
+ */
+
+#include <sal/config.h>
+
+#include <o3tl/safeint.hxx>
+#include <xmloff/unointerfacetouniqueidentifiermapper.hxx>
+
+using namespace ::com::sun::star;
+using css::uno::Reference;
+using css::uno::XInterface;
+
+namespace comphelper
+{
+
+UnoInterfaceToUniqueIdentifierMapper::UnoInterfaceToUniqueIdentifierMapper()
+: mnNextId( 1 )
+{
+}
+
+const OUString& UnoInterfaceToUniqueIdentifierMapper::registerReference( const Reference< XInterface >& rInterface )
+{
+    // Be certain that the references we store in our table are to the
+    // leading / primary XInterface - cf. findReference
+    uno::Reference< uno::XInterface > xRef( rInterface, uno::UNO_QUERY );
+
+    IdMap_t::const_iterator aIter;
+    if( findReference( xRef, aIter ) )
+    {
+        return (*aIter).first;
+    }
+    else
+    {
+        OUString aId = "id" + OUString::number( mnNextId++ );
+        return (*maEntries.emplace( aId, xRef ).first).first;
+    }
+}
+
+bool UnoInterfaceToUniqueIdentifierMapper::registerReference( const OUString& rIdentifier, const Reference< XInterface >& rInterface )
+{
+    IdMap_t::const_iterator aIter;
+
+    // Be certain that the references we store in our table are to the
+    // leading / primary XInterface - cf. findReference
+    uno::Reference< uno::XInterface > xRef( rInterface, uno::UNO_QUERY );
+
+    if( findReference( xRef, aIter ) )
+    {
+        return rIdentifier != (*aIter).first;
+    }
+    else if( findIdentifier( rIdentifier, aIter ) )
+    {
+        return false;
+    }
+    else
+    {
+        insertReference( rIdentifier, xRef );
+    }
+
+    return true;
+}
+
+void UnoInterfaceToUniqueIdentifierMapper::registerReferenceAlways( const OUString& rIdentifier, const Reference< XInterface >& rInterface )
+{
+    // Be certain that the references we store in our table are to the
+    // leading / primary XInterface - cf. findReference
+    uno::Reference< uno::XInterface > xRef( rInterface, uno::UNO_QUERY );
+
+    insertReference( rIdentifier, xRef );
+}
+
+const OUString& UnoInterfaceToUniqueIdentifierMapper::getIdentifier( const Reference< XInterface >& rInterface ) const
+{
+    IdMap_t::const_iterator aIter;
+    if( findReference( rInterface, aIter ) )
+    {
+        return (*aIter).first;
+    }
+    else
+    {
+        static const OUString aEmpty;
+        return aEmpty;
+    }
+}
+
+const Reference< XInterface >& UnoInterfaceToUniqueIdentifierMapper::getReference( const OUString& rIdentifier ) const
+{
+    IdMap_t::const_iterator aIter;
+    if( findIdentifier( rIdentifier, aIter ) )
+    {
+        return (*aIter).second;
+    }
+    else
+    {
+        static const Reference< XInterface > aEmpty;
+        return aEmpty;
+    }
+}
+
+bool UnoInterfaceToUniqueIdentifierMapper::findReference( const Reference< XInterface >& rInterface, IdMap_t::const_iterator& rIter ) const
+{
+    uno::Reference< uno::XInterface > xRef( rInterface, uno::UNO_QUERY );
+
+    const IdMap_t::const_iterator aEnd( maEntries.end() );
+    rIter = std::find_if(maEntries.begin(), aEnd, [&xRef](const IdMap_t::value_type& rItem) {
+        // The Reference == operator, does a repeated queryInterface on
+        // this to ensure we got the right XInterface base-class. However,
+        // we can be sure that this has been done already by the time we
+        // get to here.
+        return rItem.second.get() == xRef.get();
+    });
+
+    return rIter != aEnd;
+}
+
+bool UnoInterfaceToUniqueIdentifierMapper::findIdentifier( const OUString& rIdentifier, IdMap_t::const_iterator& rIter ) const
+{
+    rIter = maEntries.find( rIdentifier );
+    return rIter != maEntries.end();
+}
+
+void UnoInterfaceToUniqueIdentifierMapper::insertReference( const OUString& rIdentifier, const Reference< XInterface >& rInterface )
+{
+    maEntries[rIdentifier] = rInterface;
+
+    // see if this is a reference like something we would generate in the future
+    const sal_Unicode *p = rIdentifier.getStr();
+    sal_Int32 nLength = rIdentifier.getLength();
+
+    // see if the identifier is 'id' followed by a pure integer value
+    if( nLength < 2 || p[0] != 'i' || p[1] != 'd' )
+        return;
+
+    nLength -= 2;
+    p += 2;
+
+    while(nLength--)
+    {
+        if( (*p < '0') || (*p > '9') )
+            return; // a custom id, that will never conflict with generated id's
+
+        p++;
+    }
+
+    // the identifier is a pure integer value
+    // so we make sure we will never generate
+    // an integer value like this one
+    sal_Int32 nId = rIdentifier.copy(2).toInt32();
+    if (nId > 0 && mnNextId <= o3tl::make_unsigned(nId))
+    {
+        mnNextId = nId;
+        ++mnNextId;
+    }
+}
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */