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<TITLE> DwParameter Man Page </TITLE>
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<BODY BGCOLOR="#FFFFFF">
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<H2>
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<FONT COLOR="navy"> NAME </FONT>
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</H2>
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<P>
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DwParameter -- Class representing a MIME field body parameter
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<H2>
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<FONT COLOR="navy"> SYNOPSIS </FONT>
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</H2>
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<PRE>class DW_EXPORT DwParameter : public <A HREF="msgcmp.html">DwMessageComponent</A> {
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friend class DwMediaType;
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public:
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<A HREF="param.html#DwParameter">DwParameter</A>();
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<A HREF="param.html#DwParameter">DwParameter</A>(const DwParameter& aParam);
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<A HREF="param.html#DwParameter">DwParameter</A>(const DwString& aStr, DwMessageComponent* aParent=0);
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virtual ~DwParameter();
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const DwParameter& <A HREF="param.html#op_eq">operator =</A> (const DwParameter& aParam);
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virtual void <A HREF="param.html#Parse">Parse</A>();
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virtual void <A HREF="param.html#Assemble">Assemble</A>();
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virtual DwMessageComponent* <A HREF="param.html#Clone">Clone</A>() const;
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const DwString& <A HREF="param.html#Attribute">Attribute</A>() const;
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void <A HREF="param.html#SetAttribute">SetAttribute</A>(const DwString& aAttribute);
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const DwString& <A HREF="param.html#Value">Value</A>() const;
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void <A HREF="param.html#SetValue">SetValue</A>(const DwString& aValue);
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DwParameter* <A HREF="param.html#Next">Next</A>() const ;
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void <A HREF="param.html#SetNext">SetNext</A>(DwParameter* aParam);
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static DwParameter* <A HREF="param.html#NewParameter">NewParameter</A>(const DwString& aStr,
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DwMessageComponent* aParent);
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static DwParameter* (*<A HREF="param.html#sNewParameter">sNewParameter</A>)(const DwString&, DwMessageComponent*);
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public:
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virtual void <A HREF="param.html#PrintDebugInfo">PrintDebugInfo</A>(ostream& aStrm, int aDepth=0) const;
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virtual void <A HREF="param.html#CheckInvariants">CheckInvariants</A>() const;
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protected:
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void _PrintDebugInfo(ostream& aStrm) const;
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};
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</PRE>
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<H2>
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<FONT COLOR="navy"> DESCRIPTION </FONT>
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</H2>
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<P>
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<B><TT>DwParameter</TT></B> represents the <I>parameter</I> component of
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the Content-Type header field as described in RFC-2045. A parameter consists
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of an attribute/value pair. <B><TT>DwParameter</TT></B> has member functions
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for getting or setting a parameter's attribute and value.
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<P>
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A <B><TT>DwParameter</TT></B> object may be included in a list of
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<B><TT>DwParameter</TT></B> objects. You can get the next
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<B><TT>DwParameter</TT></B> object in the list by calling the member function
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<B><TT>Next()</TT></B>.
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<H2>
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<FONT COLOR="navy"> Public Member Functions </FONT>
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</H2>
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<P>
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<FONT COLOR="teal"><B> <A NAME="DwParameter">DwParameter</A>() <BR>
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DwParameter(const DwParameter& aParam) <BR>
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DwParameter(const DwString& aStr, DwMessageComponent* aParent=0)
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</B></FONT>
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<P>
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The first constructor is the default constructor, which sets the
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<B><TT>DwParameter</TT></B> object's string representation to the empty string
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and sets its parent to NULL.
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<P>
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The second constructor is the copy constructor, which copies the string
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representation, attribute, and value from <B><TT>aParam</TT></B>. The parent
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of the new <B><TT>DwParameter</TT></B> object is set to NULL.
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<P>
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The third constructor copies <B><TT>aStr</TT></B> to the
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<B><TT>DwParameter</TT></B> object's string representation and sets
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<B><TT>aParent</TT></B> as its parent. The virtual member function
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<B><TT>Parse()</TT></B> should be called immediately after this constructor
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in order to parse the string representation. Unless it is NULL,
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<B><TT>aParent</TT></B> should point to an object of a class derived from
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<B><TT>DwMediaType</TT></B>.
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<P>
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<FONT COLOR="teal"><B> const DwParameter& <A NAME="op_eq">operator =</A>
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(const DwParameter& aParam) </B></FONT>
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<P>
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This is the assignment operator.
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<P>
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<FONT COLOR="teal"><B> virtual void <A NAME="Parse">Parse</A>() </B></FONT>
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<P>
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This virtual function, inherited from <B><TT>DwMessageComponent</TT></B>,
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executes the parse method for <B><TT>DwParameter</TT></B> objects. It should
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be called immediately after the string representation is modified and before
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the parts of the broken-down representation are accessed.
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<P>
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<FONT COLOR="teal"><B> virtual void <A NAME="Assemble">Assemble</A>()
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</B></FONT>
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<P>
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This virtual function, inherited from <B><TT>DwMessageComponent</TT></B>,
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executes the assemble method for <B><TT>DwParameter</TT></B> objects. It
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should be called whenever one of the object's attributes is changed in order
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to assemble the string representation from its broken-down representation.
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It will be called automatically for this object by the parent object's
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<B><TT>Assemble()</TT></B> member function if the is-modified flag is set.
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<P>
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<FONT COLOR="teal"><B> virtual DwMessageComponent*
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<A NAME="Clone">Clone</A>() const </B></FONT>
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<P>
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This virtual function, inherited from <B><TT>DwMessageComponent</TT></B>,
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creates a new <B><TT>DwParameter</TT></B> on the free store that has the
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same value as this <B><TT>DwParameter</TT></B> object. The basic idea is
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that of a ``virtual copy constructor.''
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<P>
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<FONT COLOR="teal"><B> const DwString&
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<A NAME="Attribute">Attribute</A>() const </B></FONT>
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<P>
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Returns the attribute contained by this parameter.
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<P>
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<FONT COLOR="teal"><B> void <A NAME="SetAttribute">SetAttribute</A>(const
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DwString& aAttribute) </B></FONT>
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<P>
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Sets the attribute contained by this parameter.
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<P>
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<FONT COLOR="teal"><B> const DwString& <A NAME="Value">Value</A>() const
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</B></FONT>
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<P>
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Returns the value contained by this parameter.
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<P>
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<FONT COLOR="teal"><B> void <A NAME="SetValue">SetValue</A>(const DwString&
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aValue) </B></FONT>
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<P>
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Sets the value contained by this parameter.
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<P>
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<FONT COLOR="teal"><B> DwParameter* <A NAME="Next">Next</A>() const
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</B></FONT>
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<P>
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Returns the next <B><TT>DwParameter</TT></B> object in the list.
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<P>
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<FONT COLOR="teal"><B> void <A NAME="SetNext">SetNext</A>(DwParameter* aParam)
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</B></FONT>
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<P>
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Returns the next <B><TT>DwParameter</TT></B> object in the list. Since
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<B><TT>DwMediaType</TT></B> has member functions for adding
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<B><TT>DwParameter</TT></B> objects to its list, you should avoid using this
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function.
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<P>
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<FONT COLOR="teal"><B> static DwParameter*
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<A NAME="NewParameter">NewParameter</A>(const DwString& aStr,
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DwMessageComponent* aParent) </B></FONT>
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<P>
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Creates a new <B><TT>DwParameter</TT></B> object on the free store. If the
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static data member <B><TT>sNewParameter</TT></B> is NULL, this member function
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will create a new <B><TT>DwParameter</TT></B> and return it. Otherwise,
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<B><TT>NewParameter()</TT></B> will call the user-supplied function pointed
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to by <B><TT>sNewParameter</TT></B>, which is assumed to return an object
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from a class derived from <B><TT>DwParameter</TT></B>, and return that object.
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<P>
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<FONT COLOR="teal"><B> virtual void
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<A NAME="PrintDebugInfo">PrintDebugInfo</A>(ostream& aStrm, int aDepth=0)
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const </B></FONT>
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<P>
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This virtual function, inherited from <B><TT>DwMessageComponent</TT></B>,
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prints debugging information about this object to <B><TT>aStrm</TT></B>.
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It will also call <B><TT>PrintDebugInfo()</TT></B> for any of its child
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components down to a level of <B><TT>aDepth</TT></B>.
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<P>
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This member function is available only in the debug version of the library.
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<P>
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<FONT COLOR="teal"><B> virtual void
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<A NAME="CheckInvariants">CheckInvariants</A>() const </B></FONT>
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<P>
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Aborts if one of the invariants of the object fails. Use this member function
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to track down bugs.
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<P>
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This member function is available only in the debug version of the library.
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<H2>
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<FONT COLOR="navy"> Public Data Members </FONT>
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</H2>
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<P>
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<FONT COLOR="teal"><B> static DwParameter*
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(*<A NAME="sNewParameter">sNewParameter</A>)(const DwString&,
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DwMessageComponent*) </B></FONT>
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<P>
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If <B><TT>sNewParameter</TT></B> is not NULL, it is assumed to point to a
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user-supplied function that returns an object from a class derived from
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<B><TT>DwParameter</TT></B>.
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</BODY></HTML>
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