xmloff/source/core/unointerfacetouniqueidentifiermapper.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
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   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #include <xmloff/unointerfacetouniqueidentifiermapper.hxx>
  21
  22 using namespace ::com::sun::star;
  23 using ::com::sun::star::uno::Reference;
  24 using ::com::sun::star::uno::XInterface;
  25
  26 namespace comphelper
  27 {
  28
  29 UnoInterfaceToUniqueIdentifierMapper::UnoInterfaceToUniqueIdentifierMapper()
  30 : mnNextId( 1 )
  31 {
  32 }
  33
  34 const OUString& UnoInterfaceToUniqueIdentifierMapper::registerReference( const Reference< XInterface >& rInterface )
  35 {
  36     // Be certain that the references we store in our table are to the
  37     // leading / primary XInterface - cf. findReference
  38     uno::Reference< uno::XInterface > xRef( rInterface, uno::UNO_QUERY );
  39
  40     IdMap_t::const_iterator aIter;
  41     if( findReference( xRef, aIter ) )
  42     {
  43         return (*aIter).first;
  44     }
  45     else
  46     {
  47         OUString aId( "id" );
  48         aId += OUString::number( mnNextId++ );
  49         return (*maEntries.insert( IdMap_t::value_type( aId, xRef ) ).first).first;
  50     }
  51 }
  52
  53 bool UnoInterfaceToUniqueIdentifierMapper::registerReference( const OUString& rIdentifier, const Reference< XInterface >& rInterface )
  54 {
  55     IdMap_t::const_iterator aIter;
  56
  57     // Be certain that the references we store in our table are to the
  58     // leading / primary XInterface - cf. findReference
  59     uno::Reference< uno::XInterface > xRef( rInterface, uno::UNO_QUERY );
  60
  61     if( findReference( xRef, aIter ) )
  62     {
  63         return rIdentifier != (*aIter).first;
  64     }
  65     else if( findIdentifier( rIdentifier, aIter ) )
  66     {
  67         return false;
  68     }
  69     else
  70     {
  71         insertReference( rIdentifier, xRef );
  72     }
  73
  74     return true;
  75 }
  76
  77 void UnoInterfaceToUniqueIdentifierMapper::registerReferenceAlways( const OUString& rIdentifier, const Reference< XInterface >& rInterface )
  78 {
  79     // Be certain that the references we store in our table are to the
  80     // leading / primary XInterface - cf. findReference
  81     uno::Reference< uno::XInterface > xRef( rInterface, uno::UNO_QUERY );
  82
  83     insertReference( rIdentifier, xRef );
  84 }
  85
  86 const OUString& UnoInterfaceToUniqueIdentifierMapper::getIdentifier( const Reference< XInterface >& rInterface ) const
  87 {
  88     IdMap_t::const_iterator aIter;
  89     if( findReference( rInterface, aIter ) )
  90     {
  91         return (*aIter).first;
  92     }
  93     else
  94     {
  95         static const OUString aEmpty;
  96         return aEmpty;
  97     }
  98 }
  99
 100 const Reference< XInterface >& UnoInterfaceToUniqueIdentifierMapper::getReference( const OUString& rIdentifier ) const
 101 {
 102     IdMap_t::const_iterator aIter;
 103     if( findIdentifier( rIdentifier, aIter ) )
 104     {
 105         return (*aIter).second;
 106     }
 107     else
 108     {
 109         static const Reference< XInterface > aEmpty;
 110         return aEmpty;
 111     }
 112 }
 113
 114 bool UnoInterfaceToUniqueIdentifierMapper::findReference( const Reference< XInterface >& rInterface, IdMap_t::const_iterator& rIter ) const
 115 {
 116     uno::Reference< uno::XInterface > xRef( rInterface, uno::UNO_QUERY );
 117
 118     rIter = maEntries.begin();
 119
 120     const IdMap_t::const_iterator aEnd( maEntries.end() );
 121     while( rIter != aEnd )
 122     {
 123         // The Reference == operator, does a repeated queryInterface on
 124         // this to ensure we got the right XInterface base-class. However,
 125         // we can be sure that this has been done already by the time we
 126         // get to here.
 127         if( (*rIter).second.get() == xRef.get() )
 128             return true;
 129
 130         ++rIter;
 131     }
 132
 133     return false;
 134 }
 135
 136 bool UnoInterfaceToUniqueIdentifierMapper::findIdentifier( const OUString& rIdentifier, IdMap_t::const_iterator& rIter ) const
 137 {
 138     rIter = maEntries.find( rIdentifier );
 139     return rIter != maEntries.end();
 140 }
 141
 142 void UnoInterfaceToUniqueIdentifierMapper::insertReference( const OUString& rIdentifier, const Reference< XInterface >& rInterface )
 143 {
 144     maEntries[rIdentifier] = rInterface;
 145
 146     // see if this is a reference like something we would generate in the future
 147     const sal_Unicode *p = rIdentifier.getStr();
 148     sal_Int32 nLength = rIdentifier.getLength();
 149
 150     // see if the identifier is 'id' followed by a pure integer value
 151     if( nLength < 2 || p[0] != 'i' || p[1] != 'd' )
 152         return;
 153
 154     nLength -= 2;
 155     p += 2;
 156
 157     while(nLength--)
 158     {
 159         if( (*p < '0') || (*p > '9') )
 160             return; // a custom id, that will never conflict with genereated id's
 161
 162         p++;
 163     }
 164
 165     // the identifier is a pure integer value
 166     // so we make sure we will never generate
 167     // an integer value like this one
 168     sal_Int32 nId = rIdentifier.copy(2).toInt32();
 169     if( mnNextId <= nId )
 170         mnNextId = nId + 1;
 171 }
 172
 173 }
 174
 175 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */