511 lines
14 KiB
C++
511 lines
14 KiB
C++
/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
|
|
/*
|
|
* Copyright (c) 2008 INRIA
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation;
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*
|
|
* Authors: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
|
|
*/
|
|
#ifndef ATTRIBUTE_H
|
|
#define ATTRIBUTE_H
|
|
|
|
#include <string>
|
|
#include <stdint.h>
|
|
#include "ptr.h"
|
|
#include "object-base.h"
|
|
|
|
namespace ns3 {
|
|
|
|
class AttributeAccessor;
|
|
class AttributeChecker;
|
|
class Attribute;
|
|
|
|
/**
|
|
* \brief Hold a value for an Attribute.
|
|
*
|
|
* Instances of this class are usually created by Attribute::Create<> and
|
|
* should always be wrapped into an Attribute object.
|
|
* Most subclasses of this base class are implemented by the
|
|
* ATTRIBUTE_HELPER_* macros.
|
|
*/
|
|
class AttributeValue
|
|
{
|
|
public:
|
|
AttributeValue ();
|
|
AttributeValue (const AttributeValue &o);
|
|
AttributeValue &operator = (const AttributeValue &o);
|
|
virtual ~AttributeValue ();
|
|
|
|
/**
|
|
* \returns a deep copy of this class, wrapped into an Attribute object.
|
|
*/
|
|
virtual Attribute Copy (void) const = 0;
|
|
/**
|
|
* \param checker the checker associated to the attribute
|
|
* \returns a string representation of this value.
|
|
*
|
|
* In most cases, this method will not make any use of the checker argument.
|
|
* However, in a very limited set of cases, the checker argument is needed to
|
|
* perform proper serialization. A nice example of code which needs it is
|
|
* the EnumValue::SerializeToString code.
|
|
*/
|
|
virtual std::string SerializeToString (Ptr<const AttributeChecker> checker) const = 0;
|
|
/**
|
|
* \param value a string representation of the value
|
|
* \param checker a pointer to the checker associated to the attribute.
|
|
* \returns true if the input string was correctly-formatted and could be
|
|
* successfully deserialized, false otherwise.
|
|
*
|
|
* Upon return of this function, this AttributeValue instance contains
|
|
* the deserialized value.
|
|
* In most cases, this method will not make any use of the checker argument.
|
|
* However, in a very limited set of cases, the checker argument is needed to
|
|
* perform proper serialization. A nice example of code which needs it is
|
|
* the EnumValue::SerializeToString code.
|
|
*/
|
|
virtual bool DeserializeFromString (std::string value, Ptr<const AttributeChecker> checker) = 0;
|
|
private:
|
|
friend class Attribute;
|
|
uint32_t m_count;
|
|
};
|
|
|
|
/**
|
|
* \brief an opaque wrapper around a value to set or retrieved
|
|
* from an attribute.
|
|
*
|
|
* This class is really a smart pointer to an instance of AttributeValue.
|
|
* Of course, the question is "why not use a Ptr<AttributeValue>" ?. The
|
|
* answer is long and complicated but the crux of the issue is that if we
|
|
* do not reproduce the smart pointer code in this class, we cannot provide
|
|
* transparent handling of Ptr<T> values through the attribute system.
|
|
*/
|
|
class Attribute
|
|
{
|
|
public:
|
|
Attribute ();
|
|
Attribute (const Attribute &o);
|
|
Attribute &operator = (const Attribute &o);
|
|
~Attribute ();
|
|
|
|
/**
|
|
* Forward to AttributeValue::Copy
|
|
*/
|
|
Attribute Copy (void) const;
|
|
/**
|
|
* Forward to AttributeValue::SerializeToString
|
|
*/
|
|
std::string SerializeToString (Ptr<const AttributeChecker> checker) const;
|
|
/**
|
|
* Forward to AttributeValue::DeserializeFromString
|
|
*/
|
|
bool DeserializeFromString (std::string value, Ptr<const AttributeChecker> checker);
|
|
|
|
/**
|
|
* \returns a new Attribute object which wraps an instance of the requested
|
|
* subclass of AttributeValue.
|
|
*/
|
|
template <typename T>
|
|
static Attribute Create (void);
|
|
/**
|
|
* \param a1 a value to pass through to the constructor of the class T.
|
|
* \returns a new Attribute object which wraps an instance of the requested
|
|
* subclass of AttributeValue.
|
|
*/
|
|
template <typename T, typename T1>
|
|
static Attribute Create (T1 a1);
|
|
|
|
/**
|
|
* This method performs a dynamic_cast on the underlying AttributeValue.
|
|
* This method is typically used to implement conversion operators
|
|
* from the type Attribute. In most cases, these conversion operators
|
|
* will be generated for you by the ATTRIBUTE_HELPER_* macros.
|
|
* \returns the casted pointer.
|
|
*/
|
|
template <typename T>
|
|
T DynCast (void) const;
|
|
|
|
/**
|
|
* \param pointer a pointer to convert into an Attribute.
|
|
*/
|
|
template <typename T>
|
|
Attribute (Ptr<T> pointer);
|
|
/**
|
|
* \returns a pointer converted from this Attribute instance.
|
|
*/
|
|
template <typename T>
|
|
operator Ptr<T> ();
|
|
|
|
private:
|
|
Attribute (AttributeValue *value);
|
|
AttributeValue *m_value;
|
|
};
|
|
|
|
/**
|
|
* \brief allow setting and getting the value of an attribute.
|
|
*
|
|
* The goal of this class is to hide from the user how an attribute
|
|
* is actually set or get to or from a class instance. Implementations
|
|
* of this base class are usually provided through the MakeAccessorHelper
|
|
* template functions, hidden behind an ATTRIBUTE_HELPER_* macro.
|
|
*/
|
|
class AttributeAccessor : public ObjectBase
|
|
{
|
|
public:
|
|
AttributeAccessor ();
|
|
void Ref (void) const;
|
|
void Unref (void) const;
|
|
virtual ~AttributeAccessor ();
|
|
|
|
/**
|
|
* \param object the object instance to set the value in
|
|
* \param value the value to set
|
|
* \returns true if the value could be set successfully, false otherwise.
|
|
*
|
|
* This method expects that the caller has checked that the input value is
|
|
* valid with AttributeChecker::Check.
|
|
*/
|
|
virtual bool Set (ObjectBase * object, Attribute value) const = 0;
|
|
/**
|
|
* \param object the object instance to get the value from
|
|
* \param attribute a pointer to where the value should be set.
|
|
* \returns true if the value could be read successfully, and
|
|
* stored in the input value, false otherwise.
|
|
*
|
|
* This method expects that the caller has checked that the input value is
|
|
* valid with AttributeChecker::Check.
|
|
*/
|
|
virtual bool Get (const ObjectBase * object, Attribute value) const = 0;
|
|
private:
|
|
mutable uint32_t m_count;
|
|
};
|
|
|
|
/**
|
|
* \brief Represent the type of an attribute
|
|
*
|
|
* Each type of attribute has an associated unique AttributeChecker
|
|
* subclass. The type of the subclass can be safely used by users
|
|
* to infer the type of the associated attribute. i.e., we expect
|
|
* binding authors to use the checker associated to an attribute
|
|
* to detect the type of the associated attribute.
|
|
*
|
|
* Most subclasses of this base class are implemented by the
|
|
* ATTRIBUTE_HELPER_* macros.
|
|
*/
|
|
class AttributeChecker : public ObjectBase
|
|
{
|
|
public:
|
|
AttributeChecker ();
|
|
void Ref (void) const;
|
|
void Unref (void) const;
|
|
virtual ~AttributeChecker ();
|
|
/**
|
|
* \param value a pointer to the value to check
|
|
* \returns true if the input value is both of the right type
|
|
* and if its value is within the requested range. Returns
|
|
* false otherwise.
|
|
*/
|
|
virtual bool Check (Attribute value) const = 0;
|
|
/**
|
|
* \returns a new instance of an AttributeValue (wrapper in an Attribute
|
|
* instance) which matches the type of the underlying attribute.
|
|
*
|
|
* This method is typically used to create a temporary variable prior
|
|
* to calling Attribute::DeserializeFromString.
|
|
*/
|
|
virtual Attribute Create (void) const = 0;
|
|
private:
|
|
mutable uint32_t m_count;
|
|
};
|
|
|
|
template <typename T, typename BASE>
|
|
Ptr<AttributeChecker>
|
|
MakeSimpleAttributeChecker (void);
|
|
|
|
template <typename T, typename U>
|
|
Ptr<const AttributeAccessor>
|
|
MakePtrAccessor (Ptr<U> T::*memberVariable);
|
|
|
|
template <typename T, typename U>
|
|
Ptr<const AttributeAccessor>
|
|
MakePtrAccessor (void (T::*setter) (Ptr<U>));
|
|
template <typename T, typename U>
|
|
Ptr<const AttributeAccessor>
|
|
MakePtrAccessor (Ptr<U> (T::*getter) (void) const);
|
|
|
|
|
|
class PtrChecker : public AttributeChecker {};
|
|
|
|
template <typename T>
|
|
Ptr<AttributeChecker> MakePtrChecker (void);
|
|
|
|
|
|
|
|
} // namespace ns3
|
|
|
|
namespace ns3 {
|
|
|
|
/********************************************************
|
|
* The class used to access the pointer stored in a
|
|
* PtrValue<T> AttributeValue instance.
|
|
********************************************************/
|
|
|
|
class PtrValueBase : public AttributeValue
|
|
{
|
|
public:
|
|
virtual ObjectBase *PeekObjectBase (void) const = 0;
|
|
virtual bool SetObjectBase (ObjectBase *object) = 0;
|
|
virtual std::string SerializeToString (Ptr<const AttributeChecker> checker) const;
|
|
virtual bool DeserializeFromString (std::string value, Ptr<const AttributeChecker> checker);
|
|
};
|
|
|
|
/********************************************************
|
|
* Store the content of a Ptr<T> in a AttributeValue
|
|
********************************************************/
|
|
|
|
namespace internal {
|
|
|
|
template <typename T>
|
|
class PtrValue : public PtrValueBase
|
|
{
|
|
public:
|
|
PtrValue ()
|
|
: m_pointer () {}
|
|
PtrValue (Ptr<T> pointer)
|
|
: m_pointer (pointer) {}
|
|
|
|
virtual ObjectBase *PeekObjectBase (void) const {
|
|
return PeekPointer (m_pointer);
|
|
}
|
|
virtual bool SetObjectBase (ObjectBase *object) {
|
|
T *ptr = dynamic_cast<T *> (object);
|
|
if (ptr == 0)
|
|
{
|
|
return false;
|
|
}
|
|
m_pointer = ptr;
|
|
return true;
|
|
}
|
|
virtual Attribute Copy (void) const {
|
|
return Attribute::Create<PtrValue<T> > (*this);
|
|
}
|
|
private:
|
|
Ptr<T> m_pointer;
|
|
};
|
|
|
|
template <typename T>
|
|
class APtrChecker : public PtrChecker
|
|
{
|
|
virtual bool Check (Attribute val) const {
|
|
const PtrValueBase *value = val.DynCast<const PtrValueBase *> ();
|
|
if (value == 0)
|
|
{
|
|
return false;
|
|
}
|
|
if (value->PeekObjectBase () == 0)
|
|
{
|
|
return true;
|
|
}
|
|
T *ptr = dynamic_cast<T*> (value->PeekObjectBase ());
|
|
if (ptr == 0)
|
|
{
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
virtual Attribute Create (void) const {
|
|
return Attribute::Create<PtrValue<T> > ();
|
|
}
|
|
};
|
|
|
|
/********************************************************
|
|
* The Accessor associated to
|
|
* PtrValue<T>
|
|
********************************************************/
|
|
|
|
template <typename T, typename U>
|
|
class PtrAccessor : public AttributeAccessor
|
|
{
|
|
public:
|
|
virtual ~PtrAccessor () {}
|
|
virtual bool Set (ObjectBase * object, Attribute val) const {
|
|
T *obj = dynamic_cast<T *> (object);
|
|
if (obj == 0)
|
|
{
|
|
return false;
|
|
}
|
|
const PtrValueBase *value = val.DynCast<const PtrValueBase *> ();
|
|
if (value == 0)
|
|
{
|
|
return false;
|
|
}
|
|
Ptr<U> ptr = dynamic_cast<U*> (value->PeekObjectBase ());
|
|
if (ptr == 0)
|
|
{
|
|
return false;
|
|
}
|
|
DoSet (obj, ptr);
|
|
return true;
|
|
}
|
|
virtual bool Get (const ObjectBase * object, Attribute val) const {
|
|
const T *obj = dynamic_cast<const T *> (object);
|
|
if (obj == 0)
|
|
{
|
|
return false;
|
|
}
|
|
PtrValueBase *value = val.DynCast<PtrValueBase *> ();
|
|
if (value == 0)
|
|
{
|
|
return false;
|
|
}
|
|
return value->SetObjectBase (PeekPointer (DoGet (obj)));
|
|
}
|
|
private:
|
|
virtual void DoSet (T *object, Ptr<U> value) const = 0;
|
|
virtual Ptr<U> DoGet (const T *object) const = 0;
|
|
};
|
|
|
|
} // namespace internal
|
|
|
|
/********************************************************
|
|
* The implementation of the Attribute
|
|
* class template methods.
|
|
********************************************************/
|
|
|
|
template <typename T>
|
|
Attribute
|
|
Attribute::Create (void)
|
|
{
|
|
return Attribute (new T ());
|
|
}
|
|
template <typename T, typename T1>
|
|
Attribute
|
|
Attribute::Create (T1 a1)
|
|
{
|
|
return Attribute (new T (a1));
|
|
}
|
|
|
|
template <typename T>
|
|
T
|
|
Attribute::DynCast (void) const
|
|
{
|
|
return dynamic_cast<T> (m_value);
|
|
}
|
|
|
|
template <typename T>
|
|
Attribute::Attribute (Ptr<T> pointer)
|
|
: m_value (new internal::PtrValue<T> (pointer))
|
|
{}
|
|
template <typename T>
|
|
Attribute::operator Ptr<T> ()
|
|
{
|
|
PtrValueBase *value = DynCast<PtrValueBase *> ();
|
|
if (value == 0)
|
|
{
|
|
return 0;
|
|
}
|
|
ObjectBase *objectBase = value->PeekObjectBase ();
|
|
T *obj = dynamic_cast<T *> (objectBase);
|
|
if (obj == 0)
|
|
{
|
|
return 0;
|
|
}
|
|
return obj;
|
|
}
|
|
|
|
|
|
|
|
template <typename T, typename U>
|
|
Ptr<const AttributeAccessor>
|
|
MakePtrAccessor (Ptr<U> T::*memberVariable)
|
|
{
|
|
struct MemberVariable : public internal::PtrAccessor<T,U>
|
|
{
|
|
Ptr<U> T::*m_memberVariable;
|
|
virtual void DoSet (T *object, Ptr<U> value) const {
|
|
(object->*m_memberVariable) = value;
|
|
}
|
|
virtual Ptr<U> DoGet (const T *object) const {
|
|
return object->*m_memberVariable;
|
|
}
|
|
} *spec = new MemberVariable ();
|
|
spec->m_memberVariable = memberVariable;
|
|
return Ptr<const AttributeAccessor> (spec, false);
|
|
}
|
|
|
|
template <typename T, typename U>
|
|
Ptr<const AttributeAccessor>
|
|
MakePtrAccessor (void (T::*setter) (Ptr<U>))
|
|
{
|
|
struct MemberMethod : public internal::PtrAccessor<T,U>
|
|
{
|
|
void (T::*m_setter) (Ptr<U>);
|
|
virtual void DoSet (T *object, Ptr<U> value) const {
|
|
(object->*m_setter) (value);
|
|
}
|
|
virtual Ptr<U> DoGet (const T *object) const {
|
|
return 0;
|
|
//return (object->*m_getter) ();
|
|
}
|
|
} *spec = new MemberMethod ();
|
|
spec->m_setter = setter;
|
|
return Ptr<const AttributeAccessor> (spec, false);
|
|
}
|
|
|
|
template <typename T, typename U>
|
|
Ptr<const AttributeAccessor>
|
|
MakePtrAccessor (Ptr<U> (T::*getter) (void) const)
|
|
{
|
|
struct MemberMethod : public internal::PtrAccessor<T,U>
|
|
{
|
|
Ptr<U> (T::*m_getter) (void) const;
|
|
virtual void DoSet (T *object, Ptr<U> value) const {
|
|
//(object->*m_setter) (value);
|
|
}
|
|
virtual Ptr<U> DoGet (const T *object) const {
|
|
return (object->*m_getter) ();
|
|
}
|
|
} *spec = new MemberMethod ();
|
|
spec->m_getter = getter;
|
|
return Ptr<const AttributeAccessor> (spec, false);
|
|
}
|
|
|
|
|
|
template <typename T>
|
|
Ptr<AttributeChecker>
|
|
MakePtrChecker (void)
|
|
{
|
|
return Create<internal::APtrChecker<T> > ();
|
|
}
|
|
|
|
template <typename T, typename BASE>
|
|
Ptr<AttributeChecker>
|
|
MakeSimpleAttributeChecker (void)
|
|
{
|
|
struct SimpleAttributeChecker : public BASE
|
|
{
|
|
virtual bool Check (Attribute value) const {
|
|
return value.DynCast<const T *> () != 0;
|
|
}
|
|
virtual Attribute Create (void) const {
|
|
return Attribute::Create<T> ();
|
|
}
|
|
} *checker = new SimpleAttributeChecker ();
|
|
return Ptr<AttributeChecker> (checker, false);
|
|
}
|
|
|
|
|
|
} // namespace ns3
|
|
|
|
#endif /* ATTRIBUTE_H */
|