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202 lines
8.3 KiB
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<HTML>
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<META NAME="GENERATOR" CONTENT="LinuxDoc-Tools 0.9.17">
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<TITLE>phpgwapi - VFS Class: Relativity</TITLE>
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<LINK HREF="vfs-5.html" REL=next>
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<LINK HREF="vfs-3.html" REL=previous>
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<LINK HREF="vfs.html#toc4" REL=contents>
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<A HREF="vfs-5.html">Next</A>
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<A HREF="vfs-3.html">Previous</A>
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<A HREF="vfs.html#toc4">Contents</A>
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<HR>
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<H2><A NAME="sec:relativity"></A> <A NAME="s4">4.</A> <A HREF="vfs.html#toc4">Relativity</A></H2>
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<P>Ok, just one last thing before we get into relativity. You will
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notice throughout the examples the use of $fakebase. $GLOBALS['phpgw']->vfs->fakebase
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is by default '/home'. The old VFS was hard-coded to use '/home',
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but the naming choice for this is now up to administrators. See the
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<A HREF="vfs-6.html#sec:fakebase">Fakebase directory (changing /home)</A> section for more information. Throughout the rest of this document,
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you will see $fakebase used in calls to the VFS, and /home
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used in actual paths. <EM>You should always use $fakebase when
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making applications. </EM>I suggest doing $fakebase = $GLOBALS['phpgw']->vfs->fakebase;
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right off the bat to keep things neater.</P>
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<H2><A NAME="ss4.1">4.1</A> <A HREF="vfs.html#toc4.1">What is it and how does it work?</A>
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</H2>
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<P>One of the design challenges for a Virtual File System is to
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try to figure out whether the calling application is referring to
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a file inside or outside the virtual root, and if inside, exactly
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where. To solve this problem, the eGoupWare VFS uses RELATIVE
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defines that are used in bitmasks passed to each function. The result
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is that any set of different relativities can be used in combination
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with each other. Let's look at a few examples. Say you want to move
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'logo.png' from the user's home directory to the current directory.</P>
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<P>
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<PRE>
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$GLOBALS['phpgw']->vfs->mv (array(
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'from' => 'logo.png',
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'to' => 'logo.png',
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'relatives' => array(
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RELATIVE_USER,
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RELATIVE_ALL
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)
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));
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</PRE>
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</P>
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<P>RELATIVE_USER means relative to the user's home directory. RELATIVE_ALL
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means relative to the current directory, as set by cd () and as reported
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by pwd (). So if the current directory was "$fakebase/my_group/project1",
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the call to mv () would be processed as:</P>
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<P>
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<PRE>
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MOVE "$fakebase/jason/logo.png" TO "$fakebase/my_group/project1/logo.png"
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</PRE>
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</P>
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<P>and the actual file system call would be:</P>
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<P>
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<PRE>
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rename ('/var/www/egroupware/files/home/jason/logo.php', '/var/www/egroupware/files/home/my_group/project1/logo.png');
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</PRE>
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</P>
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<P>Those used to the old VFS will note that you do not have to translate
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the path beforehand. Let's look at another example. Suppose you were
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moving an email attachment stored in eGoupWare's temporary directory
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to the 'attachments' directory within the user's home directory (we're
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assuming the attachments directory exists). Note that the temporary
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directory is <EM>outside</EM> the virtual root.</P>
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<P>
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<PRE>
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$GLOBALS['phpgw']->vfs->mv (array(
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'from' => $GLOBALS['phpgw_info']['server']['temp_dir'] . '/' . $randomdir . '/' . $randomfile,
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'to' => 'attachments/actual_name.ext',
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'relatives' => array(
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RELATIVE_NONE|VFS_REAL,
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RELATIVE_USER
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)
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));
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</PRE>
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</P>
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<P>$randomdir and $randomfile are what the directory
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and file might be called before they are given a proper name by the
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user, which is actual_name.ext in this example. RELATIVE_NONE is
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the define for using full path names. However, RELATIVE_NONE is still
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relative to the virtual root, so we pass along VFS_REAL as well,
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to say that the file is <EM>outside</EM> the virtual root, somewhere else
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in the file system. Once again, RELATIVE_USER means relative to the
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user's home directory. So the actual file system call might look
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like this (keep in mind that $randomdir and $randomfile
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are just random strings):</P>
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<P>
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<PRE>
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rename ('/var/www/egroupware/tmp/0ak5adftgh7/jX42sC9M', '/var/www/egroupware/files/home/jason/attachments/actual_name.ext');
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</PRE>
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</P>
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<P>Of course you don't have to know that, nor should you be concerned
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with it; you can take it for granted that the VFS will translate
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the paths correctly. Let's take a look at one more example, this
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time using the RELATIVE_USER_APP define. RELATIVE_USER_APP is used
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to store quasi-hidden application files, similar to the Unix convention
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of ~/.appname. It simply appends .appname to the user's home
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directory. For example, if you were making an HTML editor application
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named 'htmledit', and wanted to keep a backup file in case something
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goes wrong, you could use RELATIVE_USER_APP to store it:</P>
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<P>
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<PRE>
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$GLOBALS['phpgw']->vfs->write (array(
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'string' => 'file.name~',
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'relatives' => array(
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RELATIVE_USER_APP
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),
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'content' => $contents
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));
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</PRE>
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</P>
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<P>This assumes that ~/.htmledit exists of course. The backup
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file "file.name~" would then be written in $fakebase/jason/.htmledit/file.name~.
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Note that storing files like this might not be as good of a solution
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as storing them in the temporary directory or in the database. But
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it is there in case you need it.</P>
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<H2><A NAME="sec:relatives_complete_list"></A> <A NAME="ss4.2">4.2</A> <A HREF="vfs.html#toc4.2">Complete List</A>
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</H2>
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<P>Here is the complete list of RELATIVE defines, and what they
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do:</P>
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<P>
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<DL>
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<DT><B>RELATIVE_ROOT</B><DD><P>Don't translate the path at all. Just prepends
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a /. You'll probably want to use RELATIVE_NONE though, which handles
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both virtual and real files.</P>
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<DT><B>RELATIVE_USER</B><DD><P>User's home directory</P>
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<DT><B>RELATIVE_CURR_USER</B><DD><P>Current user's home directory. If the
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current directory is $fakebase/my_group/project1, this will
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return is $fakebase/my_group</P>
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<DT><B>RELATIVE_USER_APP</B><DD><P>Append .appname to the user's home directory,
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where appname is the current application's appname</P>
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<DT><B>RELATIVE_PATH</B><DD><P>DO NOT USE. Relative to the current directory,
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used in RELATIVE_ALL</P>
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<DT><B>RELATIVE_NONE</B><DD><P>Not relative to anything. Use this with VFS_REAL
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for files outside the virtual root. Note that using RELATIVE_NONE
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by itself still means relative to the virtual root</P>
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<DT><B>RELATIVE_CURRENT</B><DD><P>An alias for the currently set RELATIVE
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define, or RELATIVE_ALL if none is set (see the Defaults section)</P>
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<DT><B>VFS_REAL</B><DD><P>File is outside of the virtual root. Usually used
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with RELATIVE_NONE</P>
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<DT><B>RELATIVE_ALL</B><DD><P>Relative to the current directory. Use RELATIVE_ALL<EM></EM>instead of RELATIVE_PATH</P>
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</DL>
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</P>
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<H2><A NAME="sec:relatives_defaults"></A> <A NAME="ss4.3">4.3</A> <A HREF="vfs.html#toc4.3">Defaults</A>
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</H2>
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<P>You might be thinking to yourself that passing along RELATIVE
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defines with every VFS call is overkill, especially if your application
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always uses the same relativity. The default RELATIVE define for
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all VFS calls is RELATIVE_CURRENT. RELATIVE_CURRENT itself defaults
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to RELATIVE_ALL (relative to the current path), <EM>unless</EM> your application
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sets a specific relativity. If your application requires most of
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the work to be done outside of the virtual root, you may wish to
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set RELATIVE_CURRENT to RELATIVE_NONE|VFS_REAL. set_relative () is
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the function to do this. For example:</P>
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<P>
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<PRE>
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$GLOBALS['phpgw']->vfs->set_relative (array(
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'mask' => RELATIVE_NONE|VFS_REAL
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));
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$GLOBALS['phpgw']->vfs->read (array(
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'string' => '/etc/passwd'
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));
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$GLOBALS['phpgw']->vfs->cp (array(
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'from' => '/usr/include/stdio.h',
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'to' => '/tmp/stdio.h'
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));
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$GLOBALS['phpgw']->vfs->cp (array(
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'from' => '/usr/share/pixmaps/yes.xpm',
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'to' => 'icons/yes.xpm',
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'relatives' => array(
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RELATIVE_CURRENT,
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RELATIVE_USER
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)
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));
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</PRE>
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</P>
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<P>You should notice that no relativity array is needed in the other
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calls that refer to files outside the virtual root, but one is needed
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for calls that include files inside the virtual root. Any RELATIVE
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define can be set as the default and works in the same fashion. To
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retrieve the currently set define, use get_relative (). Note that
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the relativity is reset after each page request; that is, it's good
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only for the life of the current page loading, and is not stored
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in session management.</P>
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<HR>
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<A HREF="vfs-5.html">Next</A>
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<A HREF="vfs-3.html">Previous</A>
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<A HREF="vfs.html#toc4">Contents</A>
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