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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
-