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169 lines
6.9 KiB
169 lines
6.9 KiB
15 years ago
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<HTML>
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<HEAD>
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<TITLE> DwEntity 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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DwEntity -- Abstract class representing a MIME entity
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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 DwEntity : public <A HREF="msgcmp.html">DwMessageComponent</A> {
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public:
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<A HREF="entity.html#DwEntity">DwEntity</A>();
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<A HREF="entity.html#DwEntity">DwEntity</A>(const DwEntity& aEntity);
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<A HREF="entity.html#DwEntity">DwEntity</A>(const DwString& aStr, DwMessageComponent* aParent=0);
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virtual ~DwEntity();
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const DwEntity& <A HREF="entity.html#op_eq">operator =</A> (const DwEntity& aEntity);
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virtual void <A HREF="entity.html#Parse">Parse</A>();
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virtual void <A HREF="entity.html#Assemble">Assemble</A>();
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DwHeaders& <A HREF="entity.html#Headers">Headers</A>() const;
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DwBody& <A HREF="entity.html#Body">Body</A>() const;
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protected:
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DwHeaders* mHeaders;
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DwBody* mBody;
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public:
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virtual void <A HREF="entity.html#PrintDebugInfo">PrintDebugInfo</A>(ostream& aStrm, int aDepth=0) const;
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virtual void <A HREF="entity.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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RFC-2045 defines an <I>entity</I> as either a <I>message</I> or a <I>body
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part</I>, both of which have a collection of headers and a <I>body</I>. In
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MIME++, an entity is represented by the class <B><TT>DwEntity</TT></B>, which
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contains both a <B><TT><A HREF="headers.html">DwHeaders</A></TT></B> object
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and a <B><TT><A HREF="body.html">DwBody</A></TT></B> object.
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<P>
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In the tree (broken-down) representation of message, a
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<B><TT>DwEntity</TT></B> object may be either a root node, having child nodes
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but no parent node, or an intermediate node, having both a parent node and
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child nodes. A <B><TT>DwEntity</TT></B> object that is a root node must also
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be a <B><TT><A HREF="message.html">DwMessage</A></TT></B> object. If a
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<B><TT>DwEntity</TT></B> object is an intermediate node, its parent must
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be a <B><TT>DwBody</TT></B> object. The child nodes of a
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<B><TT>DwEntity</TT></B> object are the <B><TT>DwHeaders</TT></B> and
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<B><TT>DwBody</TT></B> objects it contains.
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<P>
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Since <B><TT>DwEntity</TT></B> is an abstract base class, you cannot create
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instances of it directly. <B><TT>DwEntity</TT></B> has two derived classes,
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<B><TT><A HREF="message.html">DwMessage</A></TT></B> and
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<B><TT><A HREF="bodypart.html">DwBodyPart</A></TT></B>, which are concrete
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classes.
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<P>
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To access the contained <B><TT>DwHeaders</TT></B> object, use the member
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function <B><TT>Headers()</TT></B>. To access the contained
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<B><TT>DwBody</TT></B> object, use the member function
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<B><TT>Body()</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="DwEntity">DwEntity</A>() <BR>
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DwEntity(const DwEntity& aEntity) <BR>
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DwEntity(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>DwEntity</TT></B> object's string representation to the empty string
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and sets its parent 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>aEntity</TT></B>. The parent of the new
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<B><TT>DwEntity</TT></B> 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>DwEntity</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
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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>DwBody</TT></B>.
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<P>
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<FONT COLOR="teal"><B> const DwEntity& <A NAME="op_eq">operator =</A>
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(const DwEntity& aEntity) </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>aEntity</TT></B>. The parent node of the <B><TT>DwEntity</TT></B>
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object 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>DwEntity</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>DwEntity</TT></B> objects, the parse method parses
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the string representation and sets the values of the
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<B><TT>DwHeaders</TT></B> and <B><TT>DwBody</TT></B> objects it contains.
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This member function also calls the <B><TT>Parse()</TT></B> member functions
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of the contained <B><TT>DwHeaders</TT></B> and <B><TT>DwBody</TT></B> objects.
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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 either the contained headers or body.
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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>DwEntity</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 string representations of the contained
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<B><TT>DwHeaders</TT></B> and <B><TT>DwBody</TT></B> objects. This member
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function calls the <B><TT>Assemble()</TT></B> member functions of its
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<B><TT>DwHeaders</TT></B> and <B><TT>DwBody</TT></B> objects.
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<P>
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You should call this member function after you modify either the contained
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headers or body, 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> Dw<A NAME="Headers">Headers</A>& Headers() const
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</B></FONT>
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<P>
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This function returns the <B><TT>DwHeaders</TT></B> object contained by this
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object.
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<P>
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<FONT COLOR="teal"><B> Dw<A NAME="Body">Body</A>& Body() const
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</B></FONT>
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<P>
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This function returns the <B><TT>DwBody</TT></B> object contained by this
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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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<P>
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</BODY></HTML>
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