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diff --git a/idlc/inc/idlc/astinterface.hxx b/idlc/inc/idlc/astinterface.hxx
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+++ b/idlc/inc/idlc/astinterface.hxx
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+/*************************************************************************
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * Copyright 2000, 2010 Oracle and/or its affiliates.
+ *
+ * OpenOffice.org - a multi-platform office productivity suite
+ *
+ * This file is part of OpenOffice.org.
+ *
+ * OpenOffice.org is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 3
+ * only, as published by the Free Software Foundation.
+ *
+ * OpenOffice.org is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License version 3 for more details
+ * (a copy is included in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * version 3 along with OpenOffice.org.  If not, see
+ * <http://www.openoffice.org/license.html>
+ * for a copy of the LGPLv3 License.
+ *
+ ************************************************************************/
+#ifndef _IDLC_ASTINTERFACE_HXX_
+#define _IDLC_ASTINTERFACE_HXX_
+
+#include <idlc/asttype.hxx>
+#include <idlc/astscope.hxx>
+#include "idlc/inheritedinterface.hxx"
+
+#include <map>
+#include <vector>
+
+class AstInterface : public AstType
+                   , public AstScope
+{
+public:
+    typedef std::vector< InheritedInterface > InheritedInterfaces;
+
+    typedef std::vector< AstInterface const * > DoubleInterfaceDeclarations;
+
+    struct DoubleMemberDeclaration {
+        AstDeclaration const * first;
+        AstDeclaration const * second;
+    };
+
+    typedef std::vector< DoubleMemberDeclaration > DoubleMemberDeclarations;
+
+    struct DoubleDeclarations {
+        DoubleInterfaceDeclarations interfaces;
+        DoubleMemberDeclarations members;
+    };
+
+    AstInterface(
+        const ::rtl::OString& name, AstInterface const * pInherits,
+        AstScope* pScope);
+    virtual ~AstInterface();
+
+    InheritedInterfaces const & getAllInheritedInterfaces() const
+    { return m_inheritedInterfaces; }
+
+    bool hasMandatoryInheritedInterfaces() const
+    { return m_mandatoryInterfaces > 0; }
+
+    void setForwarded(sal_Bool bForwarded)
+        { m_bForwarded = bForwarded; }
+    sal_Bool isForwarded()
+        { return m_bForwarded; }
+    void setForwardedInSameFile(sal_Bool bForwarded)
+        { m_bForwardedInSameFile = bForwarded; }
+    sal_Bool isForwardedInSameFile()
+        { return m_bForwardedInSameFile; }
+
+    void setDefined() { m_bIsDefined = true; }
+    sal_Bool isDefined() const
+        { return m_bIsDefined; }
+
+    bool usesSingleInheritance() const { return m_bSingleInheritance; }
+
+    DoubleDeclarations checkInheritedInterfaceClashes(
+        AstInterface const * ifc, bool optional) const;
+
+    void addInheritedInterface(
+        AstType const * ifc, bool optional,
+        rtl::OUString const & documentation);
+
+    DoubleMemberDeclarations checkMemberClashes(
+        AstDeclaration const * member) const;
+
+    void addMember(AstDeclaration /*TODO: const*/ * member);
+
+    void forwardDefined(AstInterface const & def);
+
+    virtual sal_Bool dump(RegistryKey& rKey);
+
+private:
+    enum InterfaceKind {
+        INTERFACE_INDIRECT_OPTIONAL, INTERFACE_DIRECT_OPTIONAL,
+        INTERFACE_INDIRECT_MANDATORY, INTERFACE_DIRECT_MANDATORY };
+
+    struct VisibleMember {
+        explicit VisibleMember(AstDeclaration const * theMandatory = 0):
+            mandatory(theMandatory) {}
+
+        typedef std::map< rtl::OString, AstDeclaration const * > Optionals;
+
+        AstDeclaration const * mandatory;
+        Optionals optionals;
+    };
+
+    typedef std::map< rtl::OString, InterfaceKind > VisibleInterfaces;
+    typedef std::map< rtl::OString, VisibleMember > VisibleMembers;
+
+    void checkInheritedInterfaceClashes(
+        DoubleDeclarations & doubleDeclarations,
+        std::set< rtl::OString > & seenInterfaces, AstInterface const * ifc,
+        bool optional, bool direct, bool mainOptional) const;
+
+    void checkMemberClashes(
+        DoubleMemberDeclarations & doubleMembers, AstDeclaration const * member,
+        bool checkOptional) const;
+
+    void addVisibleInterface(
+        AstInterface const * ifc, bool direct, bool optional);
+
+    void addOptionalVisibleMembers(AstInterface const * ifc);
+
+    bool increment(sal_uInt16 * counter, char const * sort) const;
+
+    InheritedInterfaces m_inheritedInterfaces;
+    InheritedInterfaces::size_type m_mandatoryInterfaces;
+    sal_Bool    m_bIsDefined;
+    sal_Bool    m_bForwarded;
+    sal_Bool    m_bForwardedInSameFile;
+    bool m_bSingleInheritance;
+    VisibleInterfaces m_visibleInterfaces;
+    VisibleMembers m_visibleMembers;
+};
+
+#endif // _IDLC_ASTINTERFACE_HXX_