You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
306 lines
13 KiB
306 lines
13 KiB
15 years ago
|
<HTML>
|
||
|
|
<HEAD>
|
||
|
|
<TITLE> DwField Man Page </TITLE>
|
||
|
|
</HEAD>
|
||
|
|
<BODY BGCOLOR="#FFFFFF">
|
||
|
|
<H2>
|
||
|
|
<FONT COLOR="navy"> NAME </FONT>
|
||
|
|
</H2>
|
||
|
|
<P>
|
||
|
|
DwField -- Class representing a MIME header field
|
||
|
|
<H2>
|
||
|
|
<FONT COLOR="navy"> SYNOPSIS </FONT>
|
||
|
|
</H2>
|
||
|
|
<PRE>class DW_EXPORT DwField : public <A HREF="msgcmp.html">DwMessageComponent</A> {
|
||
|
|
|
||
|
|
friend class DwHeaders;
|
||
|
|
|
||
|
|
public:
|
||
|
|
|
||
|
|
<A HREF="field.html#DwField">DwField</A>();
|
||
|
|
<A HREF="field.html#DwField">DwField</A>(const DwField& aField);
|
||
|
|
<A HREF="field.html#DwField">DwField</A>(const DwString& aStr, DwMessageComponent* aParent=0);
|
||
|
|
virtual ~DwField();
|
||
|
|
const DwField& <A HREF="field.html#op_eq">operator =</A> (const DwField& aField);
|
||
|
|
virtual void <A HREF="field.html#Parse">Parse</A>();
|
||
|
|
virtual void <A HREF="field.html#Assemble">Assemble</A>();
|
||
|
|
virtual DwMessageComponent* <A HREF="field.html#Clone">Clone</A>() const;
|
||
|
|
DwFieldBody* <A HREF="field.html#FieldBody">FieldBody</A>() const;
|
||
|
|
const DwString& <A HREF="field.html#FieldNameStr">FieldNameStr</A>() const;
|
||
|
|
const DwString& <A HREF="field.html#FieldBodyStr">FieldBodyStr</A>() const;
|
||
|
|
DwField* <A HREF="field.html#Next">Next</A>() const;
|
||
|
|
void <A HREF="field.html#SetFieldBody">SetFieldBody</A>(DwFieldBody* aFieldBody);
|
||
|
|
void <A HREF="field.html#SetFieldNameStr">SetFieldNameStr</A>(const DwString& aStr);
|
||
|
|
void <A HREF="field.html#SetFieldBodyStr">SetFieldBodyStr</A>(const DwString& aStr);
|
||
|
|
void <A HREF="field.html#SetNext">SetNext</A>(const DwField* aField);
|
||
|
|
static DwField* <A HREF="field.html#NewField">NewField</A>(const DwString& aStr,
|
||
|
|
DwMessageComponent* aParent);
|
||
|
|
static DwFieldBody* <A HREF="field.html#CreateFieldBody">CreateFieldBody</A>(const DwString& aFieldName,
|
||
|
|
const DwString& aFieldBody, DwMessageComponent* aParent);
|
||
|
|
static DwFieldBody* _CreateFieldBody(const DwString& aFieldName,
|
||
|
|
const DwString& aFieldBody, DwMessageComponent* aParent);
|
||
|
|
static DwField* (*<A HREF="field.html#sNewField">sNewField</A>)(const DwString&, DwMessageComponent*);
|
||
|
|
static DwFieldBody* (*<A HREF="field.html#sCreateFieldBody">sCreateFieldBody</A>)(const DwString& aFieldName,
|
||
|
|
const DwString& aFieldBody, DwMessageComponent* aParent);
|
||
|
|
|
||
|
|
protected:
|
||
|
|
|
||
|
|
DwString mFieldNameStr;
|
||
|
|
DwString mFieldBodyStr;
|
||
|
|
DwFieldBody* mFieldBody;
|
||
|
|
void <A HREF="field.html#_SetFieldBody">_SetFieldBody</A>(DwFieldBody* aFieldBody);
|
||
|
|
|
||
|
|
public:
|
||
|
|
|
||
|
|
virtual void <A HREF="field.html#PrintDebugInfo">PrintDebugInfo</A>(ostream& aStrm, int aDepth=0) const;
|
||
|
|
virtual void <A HREF="field.html#CheckInvariants">CheckInvariants</A>() const;
|
||
|
|
|
||
|
|
protected:
|
||
|
|
|
||
|
|
void _PrintDebugInfo(ostream& aStrm) const;
|
||
|
|
};
|
||
|
|
</PRE>
|
||
|
|
<H2>
|
||
|
|
<FONT COLOR="navy"> DESCRIPTION </FONT>
|
||
|
|
</H2>
|
||
|
|
<P>
|
||
|
|
<B><TT>DwField</TT></B> represents a header field as described in RFC-822.
|
||
|
|
According to RFC-822, a field contains a field name and a field body. In
|
||
|
|
MIME++, a <B><TT>DwField</TT></B> contains three elements: a
|
||
|
|
<B><TT><A HREF="string.html">DwString</A></TT></B> that contains its field
|
||
|
|
name, a <B><TT>DwString</TT></B> that contains its field body, and a
|
||
|
|
<B><TT><A HREF="fieldbdy.html">DwFieldBody</A></TT></B> object that contains
|
||
|
|
a broken-down (that is, parsed) version of its field body.
|
||
|
|
<P>
|
||
|
|
In the tree (broken-down) representation of message, a
|
||
|
|
<B><TT>DwField</TT></B> object is always an intermediate node, having a parent
|
||
|
|
node and a single child node. The parent node is the
|
||
|
|
<B><TT><A HREF="headers.html">DwHeaders</A></TT></B> object that contains
|
||
|
|
it. The child node is the <B><TT>DwFieldBody</TT></B> object it contains.
|
||
|
|
<P>
|
||
|
|
To get and set the field name, use the member functions
|
||
|
|
<B><TT>FieldNameStr()</TT></B> and <B><TT>SetFieldNameStr()</TT></B>. To
|
||
|
|
get and set the field body, use the member functions
|
||
|
|
<B><TT>FieldBodyStr()</TT></B> and <B><TT>SetFieldBodyStr()</TT></B>. To
|
||
|
|
get and set the <B><TT>DwFieldBody</TT></B> object, use
|
||
|
|
<B><TT>FieldBody()</TT></B> and <B><TT>SetFieldBody()</TT></B>.
|
||
|
|
<P>
|
||
|
|
A <B><TT>DwField</TT></B> object can be included in a list of
|
||
|
|
<B><TT>DwField</TT></B> objects; usually this is the list of
|
||
|
|
<B><TT>DwField</TT></B> objects maintained by its parent
|
||
|
|
<B><TT>DwHeaders</TT></B> object. To get the next <B><TT>DwField</TT></B>
|
||
|
|
object in a list, use the member function <B><TT>Next()</TT></B>.
|
||
|
|
<H2>
|
||
|
|
<FONT COLOR="navy"> Public Member Functions </FONT>
|
||
|
|
</H2>
|
||
|
|
<P>
|
||
|
|
<FONT COLOR="teal"><B> <A NAME="DwField">DwField</A>() <BR>
|
||
|
|
DwField(const DwField& aField) <BR>
|
||
|
|
DwField(const DwString& aStr, DwMessageComponent* aParent=0) </B></FONT>
|
||
|
|
<P>
|
||
|
|
The first constructor is the default constructor, which sets the
|
||
|
|
<B><TT>DwField</TT></B> object's field name and field body to the empty string,
|
||
|
|
set its parent to <B><TT>NULL</TT></B>, and sets its
|
||
|
|
<B><TT>DwFieldBody</TT></B> object to <B><TT>NULL</TT></B>.
|
||
|
|
<P>
|
||
|
|
The second constructor is the copy constructor, which performs a deep copy
|
||
|
|
of <B><TT>aField</TT></B>. The parent of the new <B><TT>DwField</TT></B>
|
||
|
|
object is set to <B><TT>NULL</TT></B>.
|
||
|
|
<P>
|
||
|
|
The third constructor copies <B><TT>aStr</TT></B> to the
|
||
|
|
<B><TT>DwField</TT></B> object's string representation and sets
|
||
|
|
<B><TT>aParent</TT></B> as its parent. The virtual member function
|
||
|
|
<B><TT>Parse()</TT></B> should be called immediately after this constructor
|
||
|
|
in order to parse the string representation. Unless it is
|
||
|
|
<B><TT>NULL</TT></B>, <B><TT>aParent</TT></B> should point to an object of
|
||
|
|
a class derived from <B><TT>DwHeaders</TT></B>.
|
||
|
|
<P>
|
||
|
|
<FONT COLOR="teal"><B> const DwField& <A NAME="op_eq">operator =</A>
|
||
|
|
(const DwField& aField) </B></FONT>
|
||
|
|
<P>
|
||
|
|
This is the assignment operator, which performs a deep copy of
|
||
|
|
<B><TT>aField</TT></B>. The parent node of the <B><TT>DwField</TT></B> object
|
||
|
|
is not changed.
|
||
|
|
<P>
|
||
|
|
<FONT COLOR="teal"><B> virtual void <A NAME="Parse">Parse</A>() </B></FONT>
|
||
|
|
<P>
|
||
|
|
This virtual function, inherited from <B><TT>DwMessageComponent</TT></B>,
|
||
|
|
executes the parse method for <B><TT>DwField</TT></B> objects. The parse
|
||
|
|
method creates or updates the broken-down representation from the string
|
||
|
|
representation. For <B><TT>DwField</TT></B> objects, the parse method parses
|
||
|
|
the string representation, sets the values of the field name string and the
|
||
|
|
field body string, and creates an instance of the appropriate subclass of
|
||
|
|
<B><TT>DwFieldBody</TT></B>. This member function also calls the
|
||
|
|
<B><TT>Parse()</TT></B> member function of its contained
|
||
|
|
<B><TT>DwFieldBody</TT></B> object.
|
||
|
|
<P>
|
||
|
|
You should call this member function after you set or modify the string
|
||
|
|
representation, and before you access the field name, the field body, or
|
||
|
|
the contained <B><TT>DwFieldBody</TT></B> object.
|
||
|
|
<P>
|
||
|
|
This function clears the is-modified flag.
|
||
|
|
<P>
|
||
|
|
<FONT COLOR="teal"><B> virtual void <A NAME="Assemble">Assemble</A>()
|
||
|
|
</B></FONT>
|
||
|
|
<P>
|
||
|
|
This virtual function, inherited from <B><TT>DwMessageComponent</TT></B>,
|
||
|
|
executes the assemble method for <B><TT>DwField</TT></B> objects. The assemble
|
||
|
|
method creates or updates the string representation from the broken-down
|
||
|
|
representation. In more concrete terms, the assemble method builds the string
|
||
|
|
representation from the field name and the string representation of the contained
|
||
|
|
<B><TT>DwFieldBody</TT></B> object. This member function calls the
|
||
|
|
<B><TT>Assemble()</TT></B> member function of its contained
|
||
|
|
<B><TT>DwFieldBody</TT></B> object.
|
||
|
|
<P>
|
||
|
|
You should call this member function after you modify either the field name
|
||
|
|
or the contained <B><TT>DwFieldBody</TT></B> object, and before you retrieve
|
||
|
|
the string representation.
|
||
|
|
<P>
|
||
|
|
This function clears the is-modified flag.
|
||
|
|
<P>
|
||
|
|
<FONT COLOR="teal"><B> virtual DwMessageComponent*
|
||
|
|
<A NAME="Clone">Clone</A>() const </B></FONT>
|
||
|
|
<P>
|
||
|
|
This virtual function, inherited from <B><TT>DwMessageComponent</TT></B>,
|
||
|
|
creates a new <B><TT>DwField</TT></B> on the free store that has the same
|
||
|
|
value as this <B><TT>DwField</TT></B> object. The basic idea is that of a
|
||
|
|
virtual copy constructor.
|
||
|
|
<P>
|
||
|
|
<FONT COLOR="teal"><B> Dw<A NAME="FieldBody">FieldBody</A>* FieldBody() const
|
||
|
|
</B></FONT>
|
||
|
|
<P>
|
||
|
|
Returns the <B><TT>DwFieldBody</TT></B> object contained by this
|
||
|
|
<B><TT>DwField</TT></B> object. If there is no field body,
|
||
|
|
<B><TT>NULL</TT></B> will be returned.
|
||
|
|
<P>
|
||
|
|
<FONT COLOR="teal"><B> const DwString&
|
||
|
|
<A NAME="FieldNameStr">FieldNameStr</A>() const </B></FONT>
|
||
|
|
<P>
|
||
|
|
Returns the field name of this header field as a string.
|
||
|
|
<P>
|
||
|
|
<FONT COLOR="teal"><B> const DwString&
|
||
|
|
<A NAME="FieldBodyStr">FieldBodyStr</A>() const </B></FONT>
|
||
|
|
<P>
|
||
|
|
Returns the field body of this header field as a string.
|
||
|
|
<P>
|
||
|
|
<FONT COLOR="teal"><B> DwField* <A NAME="Next">Next</A>() const </B></FONT>
|
||
|
|
<P>
|
||
|
|
Returns the next <B><TT>DwField</TT></B> object following this
|
||
|
|
<B><TT>DwField</TT></B> object in the list contained in a
|
||
|
|
<B><TT>DwHeaders</TT></B>. Returns <B><TT>NULL</TT></B> if this object is
|
||
|
|
last in the list.
|
||
|
|
<P>
|
||
|
|
<FONT COLOR="teal"><B> void
|
||
|
|
<A NAME="SetFieldBody">SetFieldBody</A>(DwFieldBody* aFieldBody) </B></FONT>
|
||
|
|
<P>
|
||
|
|
Sets the <B><TT>DwFieldBody</TT></B> object contained by this object.
|
||
|
|
<P>
|
||
|
|
<FONT COLOR="teal"><B> void
|
||
|
|
<A NAME="SetFieldNameStr">SetFieldNameStr</A>(const DwString& aStr)
|
||
|
|
</B></FONT>
|
||
|
|
<P>
|
||
|
|
Sets the field name of this header field.
|
||
|
|
<P>
|
||
|
|
<FONT COLOR="teal"><B> void
|
||
|
|
<A NAME="SetFieldBodyStr">SetFieldBodyStr</A>(const DwString& aStr)
|
||
|
|
</B></FONT>
|
||
|
|
<P>
|
||
|
|
Sets the field body of this header field.
|
||
|
|
<P>
|
||
|
|
<FONT COLOR="teal"><B> void <A NAME="SetNext">SetNext</A>(const DwField*
|
||
|
|
aField) </B></FONT>
|
||
|
|
<P>
|
||
|
|
This <I>advanced</I> function sets <B><TT>aField</TT></B> as the next field
|
||
|
|
following this field in the list of fields contained in the headers. Since
|
||
|
|
<B><TT>DwHeaders</TT></B> contains member functions for adding
|
||
|
|
<B><TT>DwField</TT></B> objects to its list, this function should be avoided
|
||
|
|
for most applications.
|
||
|
|
<P>
|
||
|
|
<FONT COLOR="teal"><B> static DwField* <A NAME="NewField">NewField</A>(const
|
||
|
|
DwString& aStr, DwMessageComponent* aParent) </B></FONT>
|
||
|
|
<P>
|
||
|
|
Creates a new <B><TT>DwField</TT></B> object on the free store. If the static
|
||
|
|
data member <B><TT>sNewField</TT></B> is <B><TT>NULL</TT></B>, this member
|
||
|
|
function will create a new <B><TT>DwField</TT></B> and return it. Otherwise,
|
||
|
|
<B><TT>NewField()</TT></B> will call the user-supplied function pointed to
|
||
|
|
by <B><TT>sNewField</TT></B>, which is assumed to return an object from a
|
||
|
|
class derived from <B><TT>DwField</TT></B>, and return that object.
|
||
|
|
<P>
|
||
|
|
<FONT COLOR="teal"><B> static DwFieldBody*
|
||
|
|
<A NAME="CreateFieldBody">CreateFieldBody</A>(const DwString& aFieldName,
|
||
|
|
const DwString& aFieldBody, DwMessageComponent* aParent) </B></FONT>
|
||
|
|
<P>
|
||
|
|
The static member function <B><TT>CreateFieldBody()</TT></B> is called from
|
||
|
|
the <B><TT>Parse()</TT></B> member function and is responsible for creating
|
||
|
|
a <B><TT>DwFieldBody</TT></B> object for this particular field. A typical
|
||
|
|
scenario might go as follows: This member function examines the field name
|
||
|
|
for this field, finds that it contains "To", creates a
|
||
|
|
<B><TT>DwAddressList</TT></B> object to contain the field body, calls the
|
||
|
|
<B><TT>Parse()</TT></B> member function for the
|
||
|
|
<B><TT>DwAddressList</TT></B>, and sets the <B><TT>DwAddressList</TT></B>
|
||
|
|
object as this <B><TT>DwField</TT></B> object's
|
||
|
|
<B><TT>DwFieldBody</TT></B>.
|
||
|
|
<P>
|
||
|
|
If you want to override the behavior of
|
||
|
|
<B><TT>CreateFieldBody()</TT></B>, you can do so by setting the public data
|
||
|
|
member <B><TT>sCreateFieldBody</TT></B> to point to your own function.
|
||
|
|
<B><TT>CreateFieldBody()</TT></B> first checks to see if
|
||
|
|
<B><TT>sCreateFieldBody</TT></B> is <B><TT>NULL</TT></B>. If it is not,
|
||
|
|
<B><TT>CreateFieldBody()</TT></B> will assume that it points to a user-supplied
|
||
|
|
function and will call that function. If it is <B><TT>NULL</TT></B>,
|
||
|
|
<B><TT>CreateFieldBody()</TT></B> will call
|
||
|
|
<B><TT>_CreateFieldBody()</TT></B>, which actually creates the
|
||
|
|
<B><TT>DwFieldBody</TT></B> object. You may call
|
||
|
|
<B><TT>_CreateFieldBody()</TT></B> from your own function for fields you
|
||
|
|
do not wish to handle.
|
||
|
|
<P>
|
||
|
|
<FONT COLOR="teal"><B> virtual void
|
||
|
|
<A NAME="PrintDebugInfo">PrintDebugInfo</A>(ostream& aStrm, int aDepth=0)
|
||
|
|
const </B></FONT>
|
||
|
|
<P>
|
||
|
|
This virtual function, inherited from <B><TT>DwMessageComponent</TT></B>,
|
||
|
|
prints debugging information about this object to <B><TT>aStrm</TT></B>.
|
||
|
|
It will also call <B><TT>PrintDebugInfo()</TT></B> for any of its child
|
||
|
|
components down to a level of <B><TT>aDepth</TT></B>.
|
||
|
|
<P>
|
||
|
|
This member function is available only in the debug version of the library.
|
||
|
|
<P>
|
||
|
|
<FONT COLOR="teal"><B> virtual void
|
||
|
|
<A NAME="CheckInvariants">CheckInvariants</A>() const </B></FONT>
|
||
|
|
<P>
|
||
|
|
Aborts if one of the invariants of the object fails. Use this member function
|
||
|
|
to track down bugs.
|
||
|
|
<P>
|
||
|
|
This member function is available only in the debug version of the library.
|
||
|
|
<H2>
|
||
|
|
<FONT COLOR="navy"> Public Data Members </FONT>
|
||
|
|
</H2>
|
||
|
|
<P>
|
||
|
|
<FONT COLOR="teal"><B> static DwField*
|
||
|
|
(*<A NAME="sNewField">sNewField</A>)(const DwString&, DwMessageComponent*)
|
||
|
|
</B></FONT>
|
||
|
|
<P>
|
||
|
|
If <B><TT>sNewField</TT></B> is not <B><TT>NULL</TT></B>, it is assumed to
|
||
|
|
point to a user-supplied function that returns an object from a class derived
|
||
|
|
from <B><TT>DwField</TT></B>.
|
||
|
|
<P>
|
||
|
|
<FONT COLOR="teal"><B> static DwFieldBody*
|
||
|
|
(*<A NAME="sCreateFieldBody">sCreateFieldBody</A>)(const DwString&
|
||
|
|
aFieldName, const DwString& aFieldBody, DwMessageComponent* aParent)
|
||
|
|
</B></FONT>
|
||
|
|
<P>
|
||
|
|
See <B><TT><A HREF="#CreateFieldBody">CreateFieldBody</A>()</TT></B>.
|
||
|
|
<H2>
|
||
|
|
<FONT COLOR="navy"> Protected Member Functions </FONT>
|
||
|
|
</H2>
|
||
|
|
<P>
|
||
|
|
<FONT COLOR="teal"><B> void
|
||
|
|
<A NAME="_SetFieldBody">_SetFieldBody</A>(DwFieldBody* aFieldBody)
|
||
|
|
</B></FONT>
|
||
|
|
<P>
|
||
|
|
Sets the <B><TT>DwFieldBody</TT></B> object contained by this object. This
|
||
|
|
function differs from <B><TT>SetFieldBody()</TT></B> in that it does not
|
||
|
|
set the is-modified flag.
|
||
|
|
<P>
|
||
|
|
</BODY></HTML>
|