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117 lines
3.4 KiB
C++
117 lines
3.4 KiB
C++
/*
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* Copyright (C) 2013 Google Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following disclaimer
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* in the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Google Inc. nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef ResourceOwner_h
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#define ResourceOwner_h
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#include "core/fetch/ResourcePtr.h"
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namespace blink {
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template<class R, class C = typename R::ClientType>
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class ResourceOwner : public C {
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public:
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typedef R ResourceType;
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virtual ~ResourceOwner();
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ResourceType* resource() const { return m_resource.get(); }
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protected:
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ResourceOwner();
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ResourceOwner(const ResourceOwner& other) { setResource(other.resource()); }
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explicit ResourceOwner(const ResourcePtr<ResourceType>&);
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void setResource(const ResourcePtr<ResourceType>&);
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void clearResource();
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ResourceOwner& operator=(const ResourceOwner& other);
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private:
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ResourcePtr<ResourceType> m_resource;
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};
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template<class R, class C>
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inline ResourceOwner<R, C>::ResourceOwner()
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{
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}
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template<class R, class C>
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inline ResourceOwner<R, C>::~ResourceOwner()
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{
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clearResource();
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}
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template<class R, class C>
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inline ResourceOwner<R, C>::ResourceOwner(const ResourcePtr<R>& resource)
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: m_resource(resource)
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{
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if (m_resource)
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m_resource->addClient(this);
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}
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template<class R, class C>
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inline void ResourceOwner<R, C>::setResource(const ResourcePtr<R>& newResource)
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{
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if (newResource == m_resource)
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return;
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// Some ResourceClient implementations reenter this so
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// we need to prevent double removal.
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if (ResourcePtr<ResourceType> oldResource = m_resource) {
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m_resource.clear();
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oldResource->removeClient(this);
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}
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if (newResource) {
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m_resource = newResource;
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m_resource->addClient(this);
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}
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}
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template<class R, class C>
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inline void ResourceOwner<R, C>::clearResource()
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{
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setResource(0);
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}
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template<class R, class C>
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inline ResourceOwner<R, C>& ResourceOwner<R, C>::operator=(const ResourceOwner<R, C>& other)
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{
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if (this == &other)
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return *this;
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setResource(other.resource());
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return *this;
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}
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} // namespace blink
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#endif
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