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<TITLE> DwMsgId 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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DwMsgId -- Class representing an RFC-822 msg-id
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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 DwMsgId : public <A HREF="fieldbdy.html">DwFieldBody</A> {
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public:
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<A HREF="msgid.html#DwMsgId">DwMsgId</A>();
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<A HREF="msgid.html#DwMsgId">DwMsgId</A>(const DwMsgId& aMsgId);
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<A HREF="msgid.html#DwMsgId">DwMsgId</A>(const DwString& aStr, DwMessageComponent* aParent=0);
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virtual ~DwMsgId();
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const DwMsgId& <A HREF="msgid.html#op_eq">operator =</A> (const DwMsgId& aMsgId);
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virtual void <A HREF="msgid.html#Parse">Parse</A>();
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virtual void <A HREF="msgid.html#Assemble">Assemble</A>();
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virtual DwMessageComponent* <A HREF="msgid.html#Clone">Clone</A>() const;
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virtual void <A HREF="msgid.html#CreateDefault">CreateDefault</A>();
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const DwString& <A HREF="msgid.html#LocalPart">LocalPart</A>() const;
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void <A HREF="msgid.html#SetLocalPart">SetLocalPart</A>(const DwString& aLocalPart);
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const DwString& <A HREF="msgid.html#Domain">Domain</A>() const;
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void <A HREF="msgid.html#SetDomain">SetDomain</A>(const DwString& aDomain);
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static DwMsgId* <A HREF="msgid.html#NewMsgId">NewMsgId</A>(const DwString& aStr,
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DwMessageComponent* aParent);
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static DwMsgId* (*<A HREF="msgid.html#sNewMsgId">sNewMsgId</A>)(const DwString&, DwMessageComponent*);
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static const char* <A HREF="msgid.html#sHostName">sHostName</A>;
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public:
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virtual void <A HREF="msgid.html#PrintDebugInfo">PrintDebugInfo</A>(ostream& aStrm, int aDepth=0) const;
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virtual void <A HREF="msgid.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>DwMsgId</TT></B> represents a <I>msg-id</I> as described in RFC-822.
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In the BNF grammar in RFC-822, a msg-id has a <I>local-part</I> and a
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<I>domain</I>. In MIME++, a <B><TT>DwMsgId</TT></B> tqcontains strings that
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contain the local-part and the domain.
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<P>
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In the tree (broken-down) representation of message, a
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<B><TT>DwMsgId</TT></B> object may only be a leaf node, having a parent but
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no child nodes. Its parent node must be a
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<A HREF="field.html"><B><TT>DwField</TT></B> </A>object.
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<P>
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<B><TT>DwMsgId</TT></B> has member functions for getting or setting its
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local-part and its domain. You can have the library to create the contents
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of a <B><TT>DwMsgId</TT></B> object for you by calling the member function
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<B><TT>CreateDefault()</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="DwMsgId">DwMsgId</A>() <BR>
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DwMsgId(const DwMsgId& aMsgId) <BR>
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DwMsgId(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>DwMsgId</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 performs a deep copy
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of <B><TT>aMsgId</TT></B>. The parent of the new <B><TT>DwMsgId</TT></B>
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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>DwMsgId</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>DwField</TT></B>.
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<P>
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<FONT COLOR="teal"><B> const DwMsgId& <A NAME="op_eq">operator =</A>
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(const DwMsgId& aMsgId) </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>aMsgId</TT></B>. The parent node of the <B><TT>DwMsgId</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>DwMsgId</TT></B> objects. The parse
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method parses the local-part and the domain from the string representation.
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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 retrieve local-part or domain.
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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>DwMsgId</TT></B> objects. The assemble
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method creates or updates the string representation from the local-part and
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the domain.
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<P>
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You should call this member function after you modify the local-part or the
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domain, and before you retrieve 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>DwMsgId</TT></B> on the free store that has the same
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value as this <B><TT>DwMsgId</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> virtual void
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<A NAME="CreateDefault">CreateDefault</A>() </B></FONT>
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<P>
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Creates a value for the msg-id. Uses the current time, process id, and fully
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qualified domain name for the host.
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<P>
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<FONT COLOR="teal"><B> const DwString&
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<A NAME="LocalPart">LocalPart</A>() const </B></FONT>
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<P>
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Returns the local-part of the msg-id.
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<P>
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<FONT COLOR="teal"><B> void <A NAME="SetLocalPart">SetLocalPart</A>(const
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DwString& aLocalPart) </B></FONT>
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Sets the local-part of the msg-id.
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<FONT COLOR="teal"><B> const DwString& <A NAME="Domain">Domain</A>()
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const </B></FONT>
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<P>
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Returns the domain of the msg-id.
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<P>
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<FONT COLOR="teal"><B> void <A NAME="SetDomain">SetDomain</A>(const
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DwString& aDomain) </B></FONT>
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<P>
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Sets the domain of the msg-id.
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<P>
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<FONT COLOR="teal"><B> static DwMsgId* <A NAME="NewMsgId">NewMsgId</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>DwMsgId</TT></B> object on the free store. If the static
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data member <B><TT>sNewMsgId</TT></B> is NULL, this member function will
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create a new <B><TT>DwMsgId</TT></B> and return it. Otherwise,
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<B><TT>NewMsgId()</TT></B> will call the user-supplied function pointed to
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by <B><TT>sNewMsgId</TT></B>, which is assumed to return an object from a
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class derived from <B><TT>DwMsgId</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 DwMsgId*
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(*<A NAME="sNewMsgId">sNewMsgId</A>)(const DwString&, DwMessageComponent*)
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</B></FONT>
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<P>
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If <B><TT>sNewMsgId</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>DwMsgId</TT></B>.
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<P>
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<FONT COLOR="teal"><B> static const char* <A NAME="sHostName">sHostName</A>
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</B></FONT>
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<P>
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Host name of machine, used to create msg-id string. This data member is ignored
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if the platform supports a gethostname() function call.
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</BODY></HTML>
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