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<HTML>
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<HEAD>
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<TITLE> DwField Man Page </TITLE>
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</HEAD>
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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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DwField -- Class representing a MIME header field
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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 DwField : public <A HREF="msgcmp.html">DwMessageComponent</A> {
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friend class DwHeaders;
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public:
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<A HREF="field.html#DwField">DwField</A>();
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<A HREF="field.html#DwField">DwField</A>(const DwField& aField);
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<A HREF="field.html#DwField">DwField</A>(const DwString& aStr, DwMessageComponent* aParent=0);
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virtual ~DwField();
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const DwField& <A HREF="field.html#op_eq">operator =</A> (const DwField& aField);
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virtual void <A HREF="field.html#Parse">Parse</A>();
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virtual void <A HREF="field.html#Assemble">Assemble</A>();
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virtual DwMessageComponent* <A HREF="field.html#Clone">Clone</A>() const;
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DwFieldBody* <A HREF="field.html#FieldBody">FieldBody</A>() const;
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const DwString& <A HREF="field.html#FieldNameStr">FieldNameStr</A>() const;
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const DwString& <A HREF="field.html#FieldBodyStr">FieldBodyStr</A>() const;
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DwField* <A HREF="field.html#Next">Next</A>() const;
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void <A HREF="field.html#SetFieldBody">SetFieldBody</A>(DwFieldBody* aFieldBody);
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void <A HREF="field.html#SetFieldNameStr">SetFieldNameStr</A>(const DwString& aStr);
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void <A HREF="field.html#SetFieldBodyStr">SetFieldBodyStr</A>(const DwString& aStr);
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void <A HREF="field.html#SetNext">SetNext</A>(const DwField* aField);
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static DwField* <A HREF="field.html#NewField">NewField</A>(const DwString& aStr,
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DwMessageComponent* aParent);
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static DwFieldBody* <A HREF="field.html#CreateFieldBody">CreateFieldBody</A>(const DwString& aFieldName,
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const DwString& aFieldBody, DwMessageComponent* aParent);
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static DwFieldBody* _CreateFieldBody(const DwString& aFieldName,
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const DwString& aFieldBody, DwMessageComponent* aParent);
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static DwField* (*<A HREF="field.html#sNewField">sNewField</A>)(const DwString&, DwMessageComponent*);
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static DwFieldBody* (*<A HREF="field.html#sCreateFieldBody">sCreateFieldBody</A>)(const DwString& aFieldName,
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const DwString& aFieldBody, DwMessageComponent* aParent);
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protected:
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DwString mFieldNameStr;
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DwString mFieldBodyStr;
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DwFieldBody* mFieldBody;
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void <A HREF="field.html#_SetFieldBody">_SetFieldBody</A>(DwFieldBody* aFieldBody);
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public:
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virtual void <A HREF="field.html#PrintDebugInfo">PrintDebugInfo</A>(ostream& aStrm, int aDepth=0) const;
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virtual void <A HREF="field.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>DwField</TT></B> represents a header field as described in RFC-822.
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According to RFC-822, a field contains a field name and a field body. In
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MIME++, a <B><TT>DwField</TT></B> contains three elements: a
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<B><TT><A HREF="string.html">DwString</A></TT></B> that contains its field
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name, a <B><TT>DwString</TT></B> that contains its field body, and a
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<B><TT><A HREF="fieldbdy.html">DwFieldBody</A></TT></B> object that contains
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a broken-down (that is, parsed) version of its field body.
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<P>
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In the tree (broken-down) representation of message, a
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<B><TT>DwField</TT></B> object is always an intermediate node, having a tqparent
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node and a single child node. The tqparent node is the
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<B><TT><A HREF="headers.html">DwHeaders</A></TT></B> object that contains
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it. The child node is the <B><TT>DwFieldBody</TT></B> object it contains.
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<P>
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To get and set the field name, use the member functions
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<B><TT>FieldNameStr()</TT></B> and <B><TT>SetFieldNameStr()</TT></B>. To
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get and set the field body, use the member functions
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<B><TT>FieldBodyStr()</TT></B> and <B><TT>SetFieldBodyStr()</TT></B>. To
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get and set the <B><TT>DwFieldBody</TT></B> object, use
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<B><TT>FieldBody()</TT></B> and <B><TT>SetFieldBody()</TT></B>.
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<P>
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A <B><TT>DwField</TT></B> object can be included in a list of
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<B><TT>DwField</TT></B> objects; usually this is the list of
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<B><TT>DwField</TT></B> objects maintained by its tqparent
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<B><TT>DwHeaders</TT></B> object. To get the next <B><TT>DwField</TT></B>
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object in a list, use the member function <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="DwField">DwField</A>() <BR>
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DwField(const DwField& aField) <BR>
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DwField(const DwString& aStr, DwMessageComponent* aParent=0) </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>DwField</TT></B> object's field name and field body to the empty string,
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set its tqparent to <B><TT>NULL</TT></B>, and sets its
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<B><TT>DwFieldBody</TT></B> object to <B><TT>NULL</TT></B>.
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<P>
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The second constructor is the copy constructor, which performs a deep copy
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of <B><TT>aField</TT></B>. The tqparent of the new <B><TT>DwField</TT></B>
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object is set to <B><TT>NULL</TT></B>.
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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>DwField</TT></B> object's string representation and sets
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<B><TT>aParent</TT></B> as its tqparent. 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
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<B><TT>NULL</TT></B>, <B><TT>aParent</TT></B> should point to an object of
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a class derived from <B><TT>DwHeaders</TT></B>.
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<P>
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<FONT COLOR="teal"><B> const DwField& <A NAME="op_eq">operator =</A>
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(const DwField& aField) </B></FONT>
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<P>
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This is the assignment operator, which performs a deep copy of
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<B><TT>aField</TT></B>. The tqparent node of the <B><TT>DwField</TT></B> object
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is not changed.
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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>DwField</TT></B> objects. The parse
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method creates or updates the broken-down representation from the string
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representation. For <B><TT>DwField</TT></B> objects, the parse method parses
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the string representation, sets the values of the field name string and the
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field body string, and creates an instance of the appropriate subclass of
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<B><TT>DwFieldBody</TT></B>. This member function also calls the
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<B><TT>Parse()</TT></B> member function of its contained
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<B><TT>DwFieldBody</TT></B> object.
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<P>
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You should call this member function after you set or modify the string
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representation, and before you access the field name, the field body, or
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the contained <B><TT>DwFieldBody</TT></B> object.
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<P>
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This function clears the is-modified flag.
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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>DwField</TT></B> objects. The assemble
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method creates or updates the string representation from the broken-down
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representation. In more concrete terms, the assemble method builds the string
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representation from the field name and the string representation of the contained
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<B><TT>DwFieldBody</TT></B> object. This member function calls the
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<B><TT>Assemble()</TT></B> member function of its contained
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<B><TT>DwFieldBody</TT></B> object.
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<P>
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You should call this member function after you modify either the field name
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or the contained <B><TT>DwFieldBody</TT></B> object, and before you retrieve
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the string representation.
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<P>
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This function clears the is-modified flag.
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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>DwField</TT></B> on the free store that has the same
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value as this <B><TT>DwField</TT></B> object. The basic idea is that of a
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virtual copy constructor.
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<P>
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<FONT COLOR="teal"><B> Dw<A NAME="FieldBody">FieldBody</A>* FieldBody() const
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</B></FONT>
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<P>
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Returns the <B><TT>DwFieldBody</TT></B> object contained by this
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<B><TT>DwField</TT></B> object. If there is no field body,
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<B><TT>NULL</TT></B> will be returned.
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<P>
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<FONT COLOR="teal"><B> const DwString&
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<A NAME="FieldNameStr">FieldNameStr</A>() const </B></FONT>
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<P>
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Returns the field name of this header field as a string.
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<P>
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<FONT COLOR="teal"><B> const DwString&
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<A NAME="FieldBodyStr">FieldBodyStr</A>() const </B></FONT>
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<P>
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Returns the field body of this header field as a string.
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<P>
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<FONT COLOR="teal"><B> DwField* <A NAME="Next">Next</A>() const </B></FONT>
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<P>
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Returns the next <B><TT>DwField</TT></B> object following this
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<B><TT>DwField</TT></B> object in the list contained in a
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<B><TT>DwHeaders</TT></B>. Returns <B><TT>NULL</TT></B> if this object is
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last in the list.
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<P>
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<FONT COLOR="teal"><B> void
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<A NAME="SetFieldBody">SetFieldBody</A>(DwFieldBody* aFieldBody) </B></FONT>
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<P>
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Sets the <B><TT>DwFieldBody</TT></B> object contained by this object.
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<P>
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<FONT COLOR="teal"><B> void
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<A NAME="SetFieldNameStr">SetFieldNameStr</A>(const DwString& aStr)
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</B></FONT>
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<P>
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Sets the field name of this header field.
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<P>
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<FONT COLOR="teal"><B> void
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<A NAME="SetFieldBodyStr">SetFieldBodyStr</A>(const DwString& aStr)
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</B></FONT>
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<P>
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Sets the field body of this header field.
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<P>
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<FONT COLOR="teal"><B> void <A NAME="SetNext">SetNext</A>(const DwField*
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aField) </B></FONT>
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<P>
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This <I>advanced</I> function sets <B><TT>aField</TT></B> as the next field
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following this field in the list of fields contained in the headers. Since
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<B><TT>DwHeaders</TT></B> contains member functions for adding
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<B><TT>DwField</TT></B> objects to its list, this function should be avoided
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for most applications.
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<P>
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<FONT COLOR="teal"><B> static DwField* <A NAME="NewField">NewField</A>(const
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DwString& aStr, DwMessageComponent* aParent) </B></FONT>
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<P>
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Creates a new <B><TT>DwField</TT></B> object on the free store. If the static
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data member <B><TT>sNewField</TT></B> is <B><TT>NULL</TT></B>, this member
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function will create a new <B><TT>DwField</TT></B> and return it. Otherwise,
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<B><TT>NewField()</TT></B> will call the user-supplied function pointed to
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by <B><TT>sNewField</TT></B>, which is assumed to return an object from a
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class derived from <B><TT>DwField</TT></B>, and return that object.
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<P>
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<FONT COLOR="teal"><B> static DwFieldBody*
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<A NAME="CreateFieldBody">CreateFieldBody</A>(const DwString& aFieldName,
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const DwString& aFieldBody, DwMessageComponent* aParent) </B></FONT>
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<P>
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The static member function <B><TT>CreateFieldBody()</TT></B> is called from
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the <B><TT>Parse()</TT></B> member function and is responsible for creating
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a <B><TT>DwFieldBody</TT></B> object for this particular field. A typical
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scenario might go as follows: This member function examines the field name
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for this field, finds that it contains "To", creates a
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<B><TT>DwAddressList</TT></B> object to contain the field body, calls the
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<B><TT>Parse()</TT></B> member function for the
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<B><TT>DwAddressList</TT></B>, and sets the <B><TT>DwAddressList</TT></B>
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object as this <B><TT>DwField</TT></B> object's
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<B><TT>DwFieldBody</TT></B>.
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<P>
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If you want to override the behavior of
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<B><TT>CreateFieldBody()</TT></B>, you can do so by setting the public data
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member <B><TT>sCreateFieldBody</TT></B> to point to your own function.
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<B><TT>CreateFieldBody()</TT></B> first checks to see if
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<B><TT>sCreateFieldBody</TT></B> is <B><TT>NULL</TT></B>. If it is not,
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<B><TT>CreateFieldBody()</TT></B> will assume that it points to a user-supplied
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function and will call that function. If it is <B><TT>NULL</TT></B>,
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<B><TT>CreateFieldBody()</TT></B> will call
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<B><TT>_CreateFieldBody()</TT></B>, which actually creates the
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<B><TT>DwFieldBody</TT></B> object. You may call
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<B><TT>_CreateFieldBody()</TT></B> from your own function for fields you
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do not wish to handle.
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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 DwField*
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(*<A NAME="sNewField">sNewField</A>)(const DwString&, DwMessageComponent*)
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</B></FONT>
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<P>
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If <B><TT>sNewField</TT></B> is not <B><TT>NULL</TT></B>, it is assumed to
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point to a user-supplied function that returns an object from a class derived
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from <B><TT>DwField</TT></B>.
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<P>
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<FONT COLOR="teal"><B> static DwFieldBody*
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(*<A NAME="sCreateFieldBody">sCreateFieldBody</A>)(const DwString&
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aFieldName, const DwString& aFieldBody, DwMessageComponent* aParent)
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</B></FONT>
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<P>
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See <B><TT><A HREF="#CreateFieldBody">CreateFieldBody</A>()</TT></B>.
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<H2>
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<FONT COLOR="navy"> Protected Member Functions </FONT>
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</H2>
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<P>
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<FONT COLOR="teal"><B> void
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<A NAME="_SetFieldBody">_SetFieldBody</A>(DwFieldBody* aFieldBody)
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</B></FONT>
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<P>
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Sets the <B><TT>DwFieldBody</TT></B> object contained by this object. This
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function differs from <B><TT>SetFieldBody()</TT></B> in that it does not
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set the is-modified flag.
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<P>
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</BODY></HTML>
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