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- //=============================================================================
- // File: param.h
- // Contents: Declarations for DwParameter
- // 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_PARAM_H
- #define DW_PARAM_H
-
- #ifndef DW_CONFIG_H
- #include <mimelib/config.h>
- #endif
-
- #ifndef DW_STRING_H
- #include <mimelib/string.h>
- #endif
-
- #ifndef DW_MSGCMP_H
- #include <mimelib/msgcmp.h>
- #endif
-
-
- //=============================================================================
- //+ Name DwParameter -- Class representing a MIME field body parameter
- //+ Description
- //. {\tt DwParameter} represents the {\it parameter} component of the
- //. Content-Type header field as described in RFC-2045. A parameter
- //. consists of an attribute/value pair. {\tt DwParameter} has member
- //. functions for getting or setting a parameter's attribute and value.
- //.
- //. A {\tt DwParameter} object may be included in a list of {\tt DwParameter}
- //. objects. You can get the next {\tt DwParameter} object in the list by
- //. calling the member function {\tt Next()}.
- //=============================================================================
- // Last modified 1997-08-13
- //+ Noentry ~DwParameter _PrintDebugInfo
-
- class DW_EXPORT DwParameter : public DwMessageComponent {
-
- friend class DwMediaType;
-
- public:
-
- DwParameter();
- DwParameter(const DwParameter& aParam);
- DwParameter(const DwString& aStr, DwMessageComponent* aParent=0);
- //. The first constructor is the default constructor, which sets the
- //. {\tt DwParameter} object's string representation to the empty string
- //. and sets its parent to NULL.
- //.
- //. The second constructor is the copy constructor, which copies the
- //. string representation, attribute, and value from {\tt aParam}.
- //. The parent of the new {\tt DwParameter} object is set to NULL.
- //.
- //. The third constructor copies {\tt aStr} to the {\tt DwParameter}
- //. 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 NULL, {\tt aParent} should point to an object of a class
- //. derived from {\tt DwMediaType}.
-
- virtual ~DwParameter();
-
- const DwParameter& operator = (const DwParameter& aParam);
- //. This is the assignment operator.
-
- virtual void Parse();
- //. This virtual function, inherited from {\tt DwMessageComponent},
- //. executes the parse method for {\tt DwParameter} objects.
- //. It should be called immediately after the string representation
- //. is modified and before the parts of the broken-down
- //. representation are accessed.
-
- virtual void Assemble();
- //. This virtual function, inherited from {\tt DwMessageComponent},
- //. executes the assemble method for {\tt DwParameter} objects.
- //. It should be called whenever one of the object's attributes
- //. is changed in order to assemble the string representation from
- //. its broken-down 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.
-
- virtual DwMessageComponent* Clone() const;
- //. This virtual function, inherited from {\tt DwMessageComponent},
- //. creates a new {\tt DwParameter} on the free store that has the same
- //. value as this {\tt DwParameter} object. The basic idea is that of
- //. a ``virtual copy constructor.''
-
- const DwString& Attribute() const;
- //. Returns the attribute contained by this parameter.
-
- void SetAttribute(const DwString& aAttribute);
- //. Sets the attribute contained by this parameter.
-
- const DwString& Value() const;
- //. Returns the value contained by this parameter.
-
- void SetValue(const DwString& aValue, bool forceNoQuotes=false);
- //. Sets the value contained by this parameter.
-
- DwParameter* Next() const ;
- //. Returns the next {\tt DwParameter} object in the list.
-
- void SetNext(DwParameter* aParam);
- //. Returns the next {\tt DwParameter} object in the list. Since
- //. {\tt DwMediaType} has member functions for adding {\tt DwParameter}
- //. objects to its list, you should avoid using this function.
-
- static DwParameter* NewParameter(const DwString& aStr,
- DwMessageComponent* aParent);
- //. Creates a new {\tt DwParameter} object on the free store.
- //. If the static data member {\tt sNewParameter} is NULL,
- //. this member function will create a new {\tt DwParameter}
- //. and return it. Otherwise, {\tt NewParameter()} will call
- //. the user-supplied function pointed to by {\tt sNewParameter},
- //. which is assumed to return an object from a class derived from
- //. {\tt DwParameter}, and return that object.
-
- //+ Var sNewParameter
- static DwParameter* (*sNewParameter)(const DwString&, DwMessageComponent*);
- //. If {\tt sNewParameter} is not NULL, it is assumed to point to a
- //. user-supplied function that returns an object from a class derived from
- //. {\tt DwParameter}.
-
- private:
-
- DwString mAttribute;
- DwString mValue;
- bool mForceNoQuotes;
- DwParameter* mNext;
- static const char* const sClassName;
-
- 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
-