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-rw-r--r--comphelper/source/misc/compbase.cxx231
1 files changed, 231 insertions, 0 deletions
diff --git a/comphelper/source/misc/compbase.cxx b/comphelper/source/misc/compbase.cxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
+/*
+ * 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/.
+ */
+
+#include <comphelper/compbase.hxx>
+#include <sal/log.hxx>
+#include <osl/diagnose.h>
+
+namespace comphelper
+{
+WeakComponentImplHelperBase::~WeakComponentImplHelperBase() {}
+
+// css::lang::XComponent
+void SAL_CALL WeakComponentImplHelperBase::dispose()
+{
+ std::unique_lock aGuard(m_aMutex);
+ if (m_bDisposed)
+ return;
+ m_bDisposed = true;
+ disposing(aGuard);
+ if (!aGuard.owns_lock())
+ aGuard.lock();
+ css::lang::EventObject aEvt(static_cast<OWeakObject*>(this));
+ maEventListeners.disposeAndClear(aGuard, aEvt);
+}
+
+void WeakComponentImplHelperBase::disposing(std::unique_lock<std::mutex>&) {}
+
+void SAL_CALL WeakComponentImplHelperBase::addEventListener(
+ css::uno::Reference<css::lang::XEventListener> const& rxListener)
+{
+ std::unique_lock aGuard(m_aMutex);
+ if (m_bDisposed)
+ return;
+ maEventListeners.addInterface(aGuard, rxListener);
+}
+
+void SAL_CALL WeakComponentImplHelperBase::removeEventListener(
+ css::uno::Reference<css::lang::XEventListener> const& rxListener)
+{
+ std::unique_lock aGuard(m_aMutex);
+ maEventListeners.removeInterface(aGuard, rxListener);
+}
+
+css::uno::Any SAL_CALL WeakComponentImplHelperBase::queryInterface(css::uno::Type const& rType)
+{
+ css::uno::Any aReturn = ::cppu::queryInterface(rType, static_cast<css::uno::XWeak*>(this),
+ static_cast<css::lang::XComponent*>(this));
+ if (aReturn.hasValue())
+ return aReturn;
+ return OWeakObject::queryInterface(rType);
+}
+
+static void checkInterface(css::uno::Type const& rType)
+{
+ if (css::uno::TypeClass_INTERFACE != rType.getTypeClass())
+ {
+ OUString msg("querying for interface \"" + rType.getTypeName() + "\": no interface type!");
+ SAL_WARN("cppuhelper", msg);
+ throw css::uno::RuntimeException(msg);
+ }
+}
+
+static bool isXInterface(rtl_uString* pStr)
+{
+ return OUString::unacquired(&pStr) == "com.sun.star.uno.XInterface";
+}
+
+static bool td_equals(typelib_TypeDescriptionReference const* pTDR1,
+ typelib_TypeDescriptionReference const* pTDR2)
+{
+ return ((pTDR1 == pTDR2)
+ || OUString::unacquired(&pTDR1->pTypeName) == OUString::unacquired(&pTDR2->pTypeName));
+}
+
+static cppu::type_entry* getTypeEntries(cppu::class_data* cd)
+{
+ cppu::type_entry* pEntries = cd->m_typeEntries;
+ if (!cd->m_storedTypeRefs) // not inited?
+ {
+ static std::mutex aMutex;
+ std::scoped_lock guard(aMutex);
+ if (!cd->m_storedTypeRefs) // not inited?
+ {
+ // get all types
+ for (sal_Int32 n = cd->m_nTypes; n--;)
+ {
+ cppu::type_entry* pEntry = &pEntries[n];
+ css::uno::Type const& rType = (*pEntry->m_type.getCppuType)(nullptr);
+ OSL_ENSURE(rType.getTypeClass() == css::uno::TypeClass_INTERFACE,
+ "### wrong helper init: expected interface!");
+ OSL_ENSURE(
+ !isXInterface(rType.getTypeLibType()->pTypeName),
+ "### want to implement XInterface: template argument is XInterface?!?!?!");
+ if (rType.getTypeClass() != css::uno::TypeClass_INTERFACE)
+ {
+ OUString msg("type \"" + rType.getTypeName() + "\" is no interface type!");
+ SAL_WARN("cppuhelper", msg);
+ throw css::uno::RuntimeException(msg);
+ }
+ // ref is statically held by getCppuType()
+ pEntry->m_type.typeRef = rType.getTypeLibType();
+ }
+ OSL_DOUBLE_CHECKED_LOCKING_MEMORY_BARRIER();
+ cd->m_storedTypeRefs = true;
+ }
+ }
+ else
+ {
+ OSL_DOUBLE_CHECKED_LOCKING_MEMORY_BARRIER();
+ }
+ return pEntries;
+}
+
+static void* makeInterface(sal_IntPtr nOffset, void* that)
+{
+ return (static_cast<char*>(that) + nOffset);
+}
+
+static bool recursivelyFindType(typelib_TypeDescriptionReference const* demandedType,
+ typelib_InterfaceTypeDescription const* type, sal_IntPtr* offset)
+{
+ // This code assumes that the vtables of a multiple-inheritance class (the
+ // offset amount by which to adjust the this pointer) follow one another in
+ // the object layout, and that they contain slots for the inherited classes
+ // in a specific order. In theory, that need not hold for any given
+ // platform; in practice, it seems to work well on all supported platforms:
+next:
+ for (sal_Int32 i = 0; i < type->nBaseTypes; ++i)
+ {
+ if (i > 0)
+ {
+ *offset += sizeof(void*);
+ }
+ typelib_InterfaceTypeDescription const* base = type->ppBaseTypes[i];
+ // ignore XInterface:
+ if (base->nBaseTypes > 0)
+ {
+ if (td_equals(reinterpret_cast<typelib_TypeDescriptionReference const*>(base),
+ demandedType))
+ {
+ return true;
+ }
+ // Profiling showed that it is important to speed up the common case
+ // of only one base:
+ if (type->nBaseTypes == 1)
+ {
+ type = base;
+ goto next;
+ }
+ if (recursivelyFindType(demandedType, base, offset))
+ {
+ return true;
+ }
+ }
+ }
+ return false;
+}
+
+static void* queryDeepNoXInterface(typelib_TypeDescriptionReference const* pDemandedTDR,
+ cppu::class_data* cd, void* that)
+{
+ cppu::type_entry* pEntries = getTypeEntries(cd);
+ sal_Int32 nTypes = cd->m_nTypes;
+ sal_Int32 n;
+
+ // try top interfaces without getting td
+ for (n = 0; n < nTypes; ++n)
+ {
+ if (td_equals(pEntries[n].m_type.typeRef, pDemandedTDR))
+ {
+ return makeInterface(pEntries[n].m_offset, that);
+ }
+ }
+ // query deep getting td
+ for (n = 0; n < nTypes; ++n)
+ {
+ typelib_TypeDescription* pTD = nullptr;
+ TYPELIB_DANGER_GET(&pTD, pEntries[n].m_type.typeRef);
+ if (pTD)
+ {
+ // exclude top (already tested) and bottom (XInterface) interface
+ OSL_ENSURE(reinterpret_cast<typelib_InterfaceTypeDescription*>(pTD)->nBaseTypes > 0,
+ "### want to implement XInterface:"
+ " template argument is XInterface?!?!?!");
+ sal_IntPtr offset = pEntries[n].m_offset;
+ bool found = recursivelyFindType(
+ pDemandedTDR, reinterpret_cast<typelib_InterfaceTypeDescription*>(pTD), &offset);
+ TYPELIB_DANGER_RELEASE(pTD);
+ if (found)
+ {
+ return makeInterface(offset, that);
+ }
+ }
+ else
+ {
+ OUString msg("cannot get type description for type \""
+ + OUString::unacquired(&pEntries[n].m_type.typeRef->pTypeName) + "\"!");
+ SAL_WARN("cppuhelper", msg);
+ throw css::uno::RuntimeException(msg);
+ }
+ }
+ return nullptr;
+}
+
+css::uno::Any WeakComponentImplHelper_query(css::uno::Type const& rType, cppu::class_data* cd,
+ WeakComponentImplHelperBase* pBase)
+{
+ checkInterface(rType);
+ typelib_TypeDescriptionReference* pTDR = rType.getTypeLibType();
+
+ // shortcut XInterface to WeakComponentImplHelperBase
+ if (!isXInterface(pTDR->pTypeName))
+ {
+ void* p = queryDeepNoXInterface(pTDR, cd, pBase);
+ if (p)
+ {
+ return css::uno::Any(&p, pTDR);
+ }
+ }
+ return pBase->comphelper::WeakComponentImplHelperBase::queryInterface(rType);
+}
+
+} // namespace comphelper
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */