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//
// DOMObject.h
//
// Library: XML
// Package: DOM
// Module: DOM
//
// Definition of the DOMObject class.
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier: BSL-1.0
//
#ifndef DOM_DOMObject_INCLUDED
#define DOM_DOMObject_INCLUDED
#include "Poco/XML/XML.h"
namespace Poco {
namespace XML {
class XML_API DOMObject
/// The base class for all objects in the Document Object Model.
///
/// DOMObject defines the rules for memory management
/// in this implementation of the DOM. Violation of these
/// rules, which are outlined in the following, results
/// in memory leaks or dangling pointers.
///
/// Every object created by new or by a factory
/// method (for example, Document::create*) must be released
/// with a call to release() or autoRelease() when it
/// is no longer needed.
///
/// Every object created by cloning or importing another
/// object must be released.
/// For every call to duplicate() there must be a matching
/// call to release().
/// An object obtained via any other way must not be
/// released, except ownership of it has been explicitly
/// taken with a call to duplicate().
///
/// While DOMObjects are safe for use in multithreaded programs,
/// a DOMObject or one of its subclasses must not be accessed
/// from multiple threads simultaneously.
{
public:
DOMObject();
/// Creates the DOMObject.
/// The object's reference count is initialized to one.
void duplicate() const;
/// Increases the object's reference count.
void release() const;
/// Decreases the object's reference count.
/// If the reference count reaches zero,
/// the object is deleted.
virtual void autoRelease() = 0;
/// Adds the object to an appropriate
/// AutoReleasePool, which is usually the
/// AutoReleasePool managed by the Document
/// to which this object belongs.
protected:
virtual ~DOMObject();
/// Destroys the DOMObject.
private:
DOMObject(const DOMObject&);
DOMObject& operator = (const DOMObject&);
mutable int _rc;
};
//
// inlines
//
inline void DOMObject::duplicate() const
{
++_rc;
}
inline void DOMObject::release() const
{
if (--_rc == 0)
delete this;
}
} } // namespace Poco::XML
#endif // DOM_DOMObject_INCLUDED
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