unoxml/source/dom/elementlist.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.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   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 "elementlist.hxx"
  21
  22 #include <string.h>
  23
  24 #include <cppuhelper/implbase.hxx>
  25 #include <osl/diagnose.h>
  26 #include <sal/log.hxx>
  27 #include <tools/diagnose_ex.h>
  28
  29 #include "element.hxx"
  30 #include "document.hxx"
  31
  32 using namespace css::uno;
  33 using namespace css::xml::dom;
  34 using namespace css::xml::dom::events;
  35
  36 namespace
  37 {
  38     class WeakEventListener : public ::cppu::WeakImplHelper<css::xml::dom::events::XEventListener>
  39     {
  40     private:
  41         css::uno::WeakReference<css::xml::dom::events::XEventListener> mxOwner;
  42
  43     public:
  44         explicit WeakEventListener(const css::uno::Reference<css::xml::dom::events::XEventListener>& rOwner)
  45             : mxOwner(rOwner)
  46         {
  47         }
  48
  49         virtual void SAL_CALL handleEvent(const css::uno::Reference<css::xml::dom::events::XEvent>& rEvent) override
  50         {
  51             css::uno::Reference<css::xml::dom::events::XEventListener> xOwner(mxOwner.get(),
  52                 css::uno::UNO_QUERY);
  53             if (xOwner.is())
  54                 xOwner->handleEvent(rEvent);
  55         }
  56     };
  57 }
  58
  59 namespace DOM
  60 {
  61
  62     static xmlChar* lcl_initXmlString(OUString const& rString)
  63     {
  64         OString const os =
  65             OUStringToOString(rString, RTL_TEXTENCODING_UTF8);
  66         xmlChar *const pRet = new xmlChar[os.getLength() + 1];
  67         strcpy(reinterpret_cast<char*>(pRet), os.getStr());
  68         return pRet;
  69     }
  70
  71     CElementList::CElementList(::rtl::Reference<CElement> const& pElement,
  72             ::osl::Mutex & rMutex,
  73             OUString const& rName, OUString const*const pURI)
  74         : m_xImpl(new CElementListImpl(pElement, rMutex, rName, pURI))
  75     {
  76         if (pElement.is()) {
  77             m_xImpl->registerListener(*pElement);
  78         }
  79     }
  80
  81     CElementListImpl::CElementListImpl(::rtl::Reference<CElement> const& pElement,
  82             ::osl::Mutex & rMutex,
  83             OUString const& rName, OUString const*const pURI)
  84         : m_pElement(pElement)
  85         , m_rMutex(rMutex)
  86         , m_pName(lcl_initXmlString(rName))
  87         , m_pURI(pURI ? lcl_initXmlString(*pURI) : nullptr)
  88         , m_bRebuild(true)
  89     {
  90     }
  91
  92     CElementListImpl::~CElementListImpl()
  93     {
  94         if (m_xEventListener.is() && m_pElement.is())
  95         {
  96             Reference< XEventTarget > xTarget(static_cast<XElement*>(m_pElement.get()), UNO_QUERY);
  97             assert(xTarget.is());
  98             if (!xTarget.is())
  99                 return;
 100             xTarget->removeEventListener("DOMSubtreeModified", m_xEventListener, false/*capture*/);
 101         }
 102     }
 103
 104     void CElementListImpl::registerListener(CElement & rElement)
 105     {
 106         try {
 107             Reference< XEventTarget > const xTarget(
 108                     static_cast<XElement*>(& rElement), UNO_QUERY_THROW);
 109             m_xEventListener = new WeakEventListener(this);
 110             xTarget->addEventListener("DOMSubtreeModified", m_xEventListener, false/*capture*/);
 111         } catch (const Exception &){
 112             TOOLS_WARN_EXCEPTION( "unoxml", "Exception caught while registering NodeList as listener");
 113         }
 114     }
 115
 116     void CElementListImpl::buildlist(xmlNodePtr pNode, bool start)
 117     {
 118         // bail out if no rebuild is needed
 119         if (start) {
 120             if (!m_bRebuild)
 121             {
 122                 return;
 123             } else {
 124                 m_nodevector.clear();
 125                 m_bRebuild = false; // don't rebuild until tree is mutated
 126             }
 127         }
 128
 129         while (pNode != nullptr )
 130         {
 131             if (pNode->type == XML_ELEMENT_NODE &&
 132                 (strcmp(reinterpret_cast<char const *>(pNode->name), reinterpret_cast<char*>(m_pName.get())) == 0))
 133             {
 134                 if (!m_pURI) {
 135                     m_nodevector.push_back(pNode);
 136                 } else {
 137                     if (pNode->ns != nullptr && (0 ==
 138                          strcmp(reinterpret_cast<char const *>(pNode->ns->href), reinterpret_cast<char*>(m_pURI.get()))))
 139                     {
 140                         m_nodevector.push_back(pNode);
 141                     }
 142                 }
 143             }
 144             if (pNode->children != nullptr) buildlist(pNode->children, false);
 145
 146             if (!start) pNode = pNode->next;
 147             else break; // fold back
 148         }
 149     }
 150
 151     /**
 152     The number of nodes in the list.
 153     */
 154     sal_Int32 SAL_CALL CElementListImpl::getLength()
 155     {
 156         ::osl::MutexGuard const g(m_rMutex);
 157
 158         if (!m_pElement.is()) { return 0; }
 159
 160         // this has to be 'live'
 161         buildlist(m_pElement->GetNodePtr());
 162         return m_nodevector.size();
 163     }
 164     /**
 165     Returns the indexth item in the collection.
 166     */
 167     Reference< XNode > SAL_CALL CElementListImpl::item(sal_Int32 index)
 168     {
 169         if (index < 0) throw RuntimeException();
 170
 171         ::osl::MutexGuard const g(m_rMutex);
 172
 173         if (!m_pElement.is()) { return nullptr; }
 174
 175         buildlist(m_pElement->GetNodePtr());
 176         if (m_nodevector.size() <= static_cast<size_t>(index)) {
 177             throw RuntimeException();
 178         }
 179         Reference< XNode > const xRet(
 180             m_pElement->GetOwnerDocument().GetCNode(m_nodevector[index]).get());
 181         return xRet;
 182     }
 183
 184     // tree mutations can change the list
 185     void SAL_CALL CElementListImpl::handleEvent(Reference< XEvent > const&)
 186     {
 187         ::osl::MutexGuard const g(m_rMutex);
 188
 189         m_bRebuild = true;
 190     }
 191 }
 192
 193 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */