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Diffstat (limited to 'include/unotools/sharedunocomponent.hxx')
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diff --git a/include/unotools/sharedunocomponent.hxx b/include/unotools/sharedunocomponent.hxx new file mode 100644 index 000000000..169e899ca --- /dev/null +++ b/include/unotools/sharedunocomponent.hxx @@ -0,0 +1,269 @@ +/* -*- 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 . + */ + +#ifndef INCLUDED_UNOTOOLS_SHAREDUNOCOMPONENT_HXX +#define INCLUDED_UNOTOOLS_SHAREDUNOCOMPONENT_HXX + +#include <unotools/unotoolsdllapi.h> +#include <com/sun/star/uno/Reference.hxx> +#include <rtl/ref.hxx> +#include <memory> + +namespace com::sun::star { + namespace lang { + class XComponent; + } +} + +namespace utl +{ + + //= DisposableComponent + + /** is a class which controls lifetime of a UNO component via ->XComponent::dispose + + You'll usually never use this class directly, but only as parameter for a + ->SharedUNOComponent class. + */ + class UNOTOOLS_DLLPUBLIC DisposableComponent + { + css::uno::Reference< css::lang::XComponent > m_xComponent; + + public: + /** constructs a ->DisposableComponent instance + + @param _rxComponent + the component whose life time should be controlled by the instance. Must not be <NULL/>. + */ + DisposableComponent( const css::uno::Reference< css::uno::XInterface >& _rxComponent ); + + /** disposes the component represented by the instance + + The component is queried for ->XComponent(which <em>must</em> be supported), + and ->XComponent::dispose is invoked. A failure of this invocation (e.g. a thrown + exception) is silenced in release builds, and reported in debug builds. + */ + ~DisposableComponent(); + + private: + DisposableComponent( const DisposableComponent& ) = delete; + DisposableComponent& operator=( const DisposableComponent& ) = delete; + }; + + //= CloseableComponent + + class CloseableComponentImpl; + /** is a class which controls lifetime of a UNO component via ->XCloseable::close + + You'll usually never use this class directly, but only as parameter for a + ->SharedUNOComponent class. + */ + class UNOTOOLS_DLLPUBLIC CloseableComponent + { + private: + /** Our IMPL class. + */ + ::rtl::Reference< CloseableComponentImpl > m_pImpl; + + public: + /** constructs a ->CloseableComponent instance + + @param _rxComponent + the component whose life time should be controlled by the instance. Must not be <NULL/>. + */ + CloseableComponent( const css::uno::Reference< css::uno::XInterface >& _rxComponent ); + + /** destroys resources associated with this instance, and disposes the component + + The component is queried for ->XCloseable (which <em>must</em> be supported), + and ->XCloseable::close is invoked, with delivering the ownership. + If the invocation fails with a ->CloseVetoException, this is ignored, since in + this case the vetoing instance took the ownership. + + Any other failure will be reported in a debug version via assertion mechanisms, + and silenced in release builds. + */ + ~CloseableComponent(); + + private: + CloseableComponent( const CloseableComponent& ) = delete; + CloseableComponent& operator=( const CloseableComponent& ) = delete; + }; + + //= SharedUNOComponent + + /** is a helper class for sharing ownership of a UNO component + + If you need to share a UNO component, which normally needs a dedicated owner, + and is lifetime controlled by an explicit disposal action (not necessarily ->XComponent::dispose, + but <em>any</em> explicit method call, after which the object is considered + to be disposed), between different classes, ->SharedUNOComponent is what you need. + + Instead of passing around a <code>Reference< XFoo ></code>, and bothering + with ownership and disposal, you just use a <code>SharedUNOComponent< XFoo ></code>. + This instance can be passed around, including copying, and in nearly all respects behaves + like the original <code>Reference< XFoo ></code>. However, when the last + ->SharedUNOComponent referencing a certain <code>Reference< XFoo ></code> dies, it + will automatically get rid of the object held by this reference. + + @param INTERFACE + the UNO interface type as which the component should be held + + @param COMPONENT_HOLDER + a class which can be used to represent and dispose a UNO component. + The class must support (maybe explicit only) construction from a + <code>Reference< INTERFACE ></code>, and destruction. Upon destruction, + the class must dispose (by any suitable means) the component instance it was + constructed with. + */ + template < class INTERFACE, class COMPONENT = DisposableComponent > + class SharedUNOComponent + { + private: + typedef COMPONENT Component; + + private: + std::shared_ptr<Component> m_xComponent; + css::uno::Reference< INTERFACE > m_xTypedComponent; + + public: + enum AssignmentMode + { + TakeOwnership, + NoTakeOwnership + }; + + public: + SharedUNOComponent() + { + } + + explicit SharedUNOComponent( const css::uno::Reference< INTERFACE >& _rxComponent, AssignmentMode eMode = TakeOwnership ) + { + reset( _rxComponent, eMode ); + } + + SharedUNOComponent( const css::uno::BaseReference & _rRef, css::uno::UnoReference_QueryThrow _queryThrow ) + { + set( _rRef, _queryThrow ); + } + +// SharedUNOComponent& operator=( const css::uno::Reference< INTERFACE >& _rxComponent ); + // This operator is intentionally not implemented. There is no canonic ownership after this operator + // would have been applied: Should the SharedUNOComponent have the ownership of the component, + // or shouldn't it? Hard to guess, and probably wrong in 50 percent of all cases, anyway. So, + // instead of tempting clients of this class to use such a dangerous operator, we do + // not offer it at all. If you need to assign a Reference< INTERFACE > to your SharedUNOComponent, + // use the ->reset method. + + /** assigns a new component, and releases the old one + */ + void reset( const css::uno::Reference< INTERFACE >& _rxComponent, AssignmentMode _eMode = TakeOwnership ); + + inline bool set( const css::uno::BaseReference& _rRef, css::uno::UnoReference_Query _query ); + + inline void set( const css::uno::BaseReference & _rRef, css::uno::UnoReference_QueryThrow _queryThrow ); + + inline void set( const css::uno::Reference< INTERFACE >& _rRef, css::uno::UnoReference_SetThrow _setThrow ); + inline void set( const SharedUNOComponent& _rComp, css::uno::UnoReference_SetThrow _setThrow ); + + INTERFACE* SAL_CALL operator->() const; + + operator const css::uno::Reference< INTERFACE >&() const + { + return m_xTypedComponent; + } + + const css::uno::Reference< INTERFACE >& getTyped() const + { + return m_xTypedComponent; + } + + bool is() const + { + return m_xTypedComponent.is(); + } + + void clear() + { + m_xComponent.reset(); + m_xTypedComponent.clear(); + } + }; + + template < class INTERFACE, class COMPONENT > + INTERFACE* SAL_CALL SharedUNOComponent< INTERFACE, COMPONENT >::operator->() const + { + return m_xTypedComponent.operator->(); + } + + // assignments + template < class INTERFACE, class COMPONENT > + void SharedUNOComponent< INTERFACE, COMPONENT >::reset( const css::uno::Reference< INTERFACE >& _rxComponent, AssignmentMode _eMode ) + { + m_xComponent.reset(_eMode == TakeOwnership ? new COMPONENT( _rxComponent ) : nullptr); + m_xTypedComponent = _rxComponent; + } + + // comparison operators + + template < class INTERFACE, class COMPONENT > + bool operator==( const SharedUNOComponent< INTERFACE, COMPONENT >& _rLHS, const css::uno::Reference< INTERFACE >& _rRHS ) + { + return _rLHS.getTyped() == _rRHS; + } + + template < class INTERFACE, class COMPONENT > + inline css::uno::Any SAL_CALL makeAny( const SharedUNOComponent< INTERFACE, COMPONENT >& value ) + { + return makeAny( value.getTyped() ); + } + + template < class INTERFACE, class COMPONENT > + void SharedUNOComponent< INTERFACE, COMPONENT >::set( const css::uno::BaseReference & _rRef, css::uno::UnoReference_QueryThrow _queryThrow ) + { + reset( css::uno::Reference< INTERFACE >( _rRef, _queryThrow ), TakeOwnership ); + } + + template < class INTERFACE, class COMPONENT > + void SharedUNOComponent< INTERFACE, COMPONENT >::set( const css::uno::Reference< INTERFACE >& _rRef, css::uno::UnoReference_SetThrow _setThrow ) + { + reset( css::uno::Reference< INTERFACE >( _rRef, _setThrow ), TakeOwnership ); + } + + template < class INTERFACE, class COMPONENT > + void SharedUNOComponent< INTERFACE, COMPONENT >::set( const SharedUNOComponent& _rComp, css::uno::UnoReference_SetThrow _setThrow ) + { + *this = _rComp; + // provoke an exception in case the component is NULL + m_xTypedComponent.set( m_xTypedComponent, _setThrow ); + } + + template < class INTERFACE, class COMPONENT > + bool SharedUNOComponent< INTERFACE, COMPONENT >::set( const css::uno::BaseReference& _rRef, css::uno::UnoReference_Query _query ) + { + reset( css::uno::Reference< INTERFACE >( _rRef, _query ) ); + return is(); + } + +} // namespace utl + +#endif // INCLUDED_UNOTOOLS_SHAREDUNOCOMPONENT_HXX + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |