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// File: mechansm.h
// Contents: Declarations for DwMechanism
// Maintainer: Doug Sauder <dwsauder@fwb.gulf.net>
// WWW: http://www.fwb.gulf.net/~dwsauder/mimepp.html
//
// Copyright (c) 1996, 1997 Douglas W. Sauder
// All rights reserved.
//
// IN NO EVENT SHALL DOUGLAS W. SAUDER BE LIABLE TO ANY PARTY FOR DIRECT,
// INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF
// THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF DOUGLAS W. SAUDER
// HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// DOUGLAS W. SAUDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT
// NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
// PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS IS"
// BASIS, AND DOUGLAS W. SAUDER HAS NO OBLIGATION TO PROVIDE MAINTENANCE,
// SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
//
//=============================================================================
#ifndef DW_MECHANSM_H
#define DW_MECHANSM_H
#ifndef DW_CONFIG_H
#include <mimelib/config.h>
#endif
#ifndef DW_STRING_H
#include <mimelib/string.h>
#endif
#ifndef DW_FIELDBDY_H
#include <mimelib/fieldbdy.h>
#endif
//=============================================================================
//+ Name DwMechanism -- Class representing a MIME content-transfer-encoding field-body
//+ Description
//. {\tt DwMechanism} represents a field body for the
//. Content-Transfer-Encoding header field as described in RFC-2045.
//. {\tt DwMechanism} provides convenience functions that allow you to
//. set or get the content-transfer-encoding attribute as an enumerated
//. value.
//=============================================================================
// Last updated 1997-08-30
//+ Noentry ~DwMechanism _PrintDebugInfo
class DW_EXPORT DwMechanism : public DwFieldBody {
public:
DwMechanism();
DwMechanism(const DwMechanism& aCte);
DwMechanism(const DwString& aStr, DwMessageComponent* aParent=0);
//. The first constructor is the default constructor, which sets the
//. {\tt DwMechanism} object's string representation to the empty
//. string and sets its parent to {\tt NULL}.
//.
//. The second constructor is the copy constructor, which copies the
//. string representation from {\tt aCte}.
//. The parent of the new {\tt DwMechanism} object is set to {\tt NULL}.
//.
//. The third constructor copies {\tt aStr} to the {\tt DwMechanism}
//. object's string representation and sets {\tt aParent} as its parent.
//. The virtual member function {\tt Parse()} should be called immediately
//. after this constructor in order to parse the string representation.
//. Unless it is {\tt NULL}, {\tt aParent} should point to an object of
//. a class derived from {\tt DwField}.
virtual ~DwMechanism();
const DwMechanism& operator = (const DwMechanism& aCte);
//. This is the assignment operator, which performs a deep copy of
//. {\tt aCte}. The parent node of the {\tt DwMechanism} object
//. is not changed.
virtual void Parse();
//. This virtual function, inherited from {\tt DwMessageComponent},
//. executes the parse method for {\tt DwMechanism} objects.
//. It should be called immediately after the string representation
//. is modified and before any of the object's attributes are retrieved.
//.
//. This function clears the is-modified flag.
virtual void Assemble();
//. This virtual function, inherited from {\tt DwMessageComponent},
//. executes the assemble method for {\tt DwMechanism} objects.
//. It should be called whenever one of the object's attributes
//. is changed in order to assemble the string representation.
//. It will be called automatically for this object by the parent
//. object's {\tt Assemble()} member function if the is-modified
//. flag is set.
//.
//. This function clears the is-modified flag.
virtual DwMessageComponent* Clone() const;
//. This virtual function, inherited from {\tt DwMessageComponent},
//. creates a new {\tt DwMechanism} object on the free store that has
//. the same value as this {\tt DwMechanism} object. The basic idea
//. is that of a virtual copy constructor.
int AsEnum() const;
//. Returns the content transfer encoding as an enumerated value.
//. Enumerated values are defined for all standard content transfer
//. encodings in the file enum.h. If the content transfer encoding
//. is non-standard {\tt DwMime::kCteUnknown} is returned. The
//. inherited member function {\tt DwMessageComponent::AsString()}
//. may be used to get the content transfer encoding, standard or
//. non-standard, as a string.
void FromEnum(int aCte);
//. Sets the content transfer encoding from an enumerated value.
//. Enumerated values are defined for all standard content transfer
//. encodings in the file enum.h. You may set the content transfer
//. encoding to any string value, standard or non-standard, by using the
//. inherited member function {\tt DwMessageComponent::FromString()}.
static DwMechanism*
NewMechanism(const DwString& aStr, DwMessageComponent* aParent);
//. Creates a new {\tt DwMechanism} object on the free store.
//. If the static data member {\tt sNewMechanism} is {\tt NULL},
//. this member function will create a new {\tt DwMechanism}
//. and return it. Otherwise, {\tt NewMechanism()} will call
//. the user-supplied function pointed to by
//. {\tt sNewMechanism}, which is assumed to return an
//. object from a class derived from {\tt DwMechanism}, and
//. return that object.
//+ Var sNewMechanism
static DwMechanism*
(*sNewMechanism)(const DwString&, DwMessageComponent*);
//. If {\tt sNewMechanism} is not {\tt NULL}, it is assumed
//. to point to a user-supplied function that returns an object from
//. a class derived from {\tt DwMechanism}.
private:
int mCteEnum;
static const char* const sClassName;
void EnumToString();
void StringToEnum();
public:
virtual void PrintDebugInfo(std::ostream& aStrm, int aDepth=0) const;
//. This virtual function, inherited from {\tt DwMessageComponent},
//. prints debugging information about this object to {\tt aStrm}.
//. It will also call {\tt PrintDebugInfo()} for any of its child
//. components down to a level of {\tt aDepth}.
//.
//. This member function is available only in the debug version of
//. the library.
virtual void CheckInvariants() const;
//. Aborts if one of the invariants of the object fails. Use this
//. member function to track down bugs.
//.
//. This member function is available only in the debug version of
//. the library.
protected:
void _PrintDebugInfo(std::ostream& aStrm) const;
};
#endif
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