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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef PPAPI_CPP_RESOURCE_H_
#define PPAPI_CPP_RESOURCE_H_
#include "ppapi/c/pp_resource.h"
#include "ppapi/cpp/instance_handle.h"
#include "ppapi/cpp/pass_ref.h"
/// @file
/// This file defines a <code>Resource</code> type representing data associated
/// with the module.
namespace pp {
class Var;
/// A reference counted module resource.
class Resource {
public:
/// The default constructor.
Resource();
/// A constructor for copying a resource.
///
/// @param[in] other A <code>Resource</code>.
Resource(const Resource& other);
/// Destructor.
virtual ~Resource();
/// This function assigns one <code>Resource</code> to another
/// <code>Resource</code>.
///
/// @param[in] other A Resource.
///
/// @return A Resource containing the assigned Resource.
Resource& operator=(const Resource& other);
/// This functions determines if this resource is invalid or
/// uninitialized.
///
/// @return true if this resource is invalid or uninitialized.
bool is_null() const { return !pp_resource_; }
PP_Resource pp_resource() const { return pp_resource_; }
/// This function releases ownership of this resource and returns it to the
/// caller.
///
/// Note that the reference count on the resource is unchanged and the caller
/// needs to release the resource.
///
/// @return The detached <code>PP_Resource</code>.
PP_Resource detach();
protected:
/// A constructor used when a <code>PP_Resource</code> is provided as a
/// return value whose reference count we need to increment.
///
/// @param[in] resource A <code>PP_Resource</code> corresponding to a
/// resource.
explicit Resource(PP_Resource resource);
/// Constructor used when a <code>PP_Resource</code> already has a ref count
/// assigned. Add additional refcount is not taken.
Resource(PassRef, PP_Resource resource);
/// PassRefFromConstructor is called by derived class' constructors to
/// initialize this <code>Resource</code> with a <code>PP_Resource</code>
/// that has already had its reference count incremented by
/// <code>Core::AddRefResource</code>. It also assumes this object has no
/// current resource.
///
/// The intended usage of this function that the derived class constructor
/// will call the default <code>Resource</code> constructor, then make a call
/// to create a resource. It then wants to assign the new resource (which,
/// since it was returned by the browser, already had its reference count
/// increased).
///
/// @param[in] resource A <code>PP_Resource</code> corresponding to a
/// resource.
void PassRefFromConstructor(PP_Resource resource);
/// Sets this resource to null. This releases ownership of the resource.
void Clear();
private:
friend class Var;
PP_Resource pp_resource_;
};
} // namespace pp
inline bool operator==(const pp::Resource& lhs, const pp::Resource& rhs) {
return lhs.pp_resource() == rhs.pp_resource();
}
inline bool operator!=(const pp::Resource& lhs, const pp::Resource& rhs) {
return !(lhs == rhs);
}
#endif // PPAPI_CPP_RESOURCE_H_
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