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R3600/modules/bibformat/lib/core/LinkResolver.inc.php
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LinkResolver.inc.php
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<?
## $Id$
## This file is part of CDS Invenio.
## Copyright (C) 2002, 2003, 2004, 2005, 2006 CERN.
##
## CDS Invenio is free software; you can redistribute it and/or
## modify it under the terms of the GNU General Public License as
## published by the Free Software Foundation; either version 2 of the
## License, or (at your option) any later version.
##
## CDS Invenio is distributed in the hope that it will be useful, but
## WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
## General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with CDS Invenio; if not, write to the Free Software Foundation, Inc.,
## 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
//==========================================================================
// File: LinkResolver.inc (flexElink core)
// Classes: LinkResolver
// Requires: AELExecutor, Vars, IntVar
// Included: EXECUTOR, INTVARS, DB
//==========================================================================
include_once(EXECUTOR);
include_once(INTVARS);
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// Class: Link
// Purpose:
// Attributes:
// Methods:
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
class Link {
var $type;
var $params;
var $conditions;
function Link( $type )
{
include( DB );
$db=mysql_connect( $DB_HOST, $DB_USER, $DB_PASSWD );
mysql_selectdb( $DB_DB, $db );
$this->params=array();
$qry="select pname
from flxLINKTYPEPARAMS
where linktype='".addslashes($type)."'
order by ord";
$qh=mysql_query($qry, $db);
while($row=mysql_fetch_array($qh))
{
array_push($this->params, $row[0]);
}
$this->conditions=array();
$qry="select eval_order, el_condition, solvingtype, base_file, base_url
from flxLINKTYPECONDITIONS
where linktype='".$type."'
order by eval_order";
$qh=mysql_query($qry);
while($row=mysql_fetch_array($qh))
{
list($eorder, $ccode, $stype, $file, $url)=$row;
$d=new LinkConditionData();
$d->linktype=$type;
$d->eorder=$eorder;
$d->code=$ccode;
if($stype=="INT")
{
$d->file=$file;
$d->url=$url;
$c=new LinkConditionINT( $d );
}
else
{
$c=new LinkConditionEXT( $d );
}
if($c!=null)
array_push($this->conditions, $c);
}
//mysql_close($db);
}
function check( $par_values )
{
return (count($par_values)==count($this->params));
}
function solve( $par_values )
{
if(count($par_values)!=count($this->params))
{
return array(0, "Incorrect number of parameters");
}
$vars=new Vars();
for($i=0;$i<=count($this->params);$i++)
{
$vars->addValue($this->params[$i], $par_values[$i]);
}
foreach($this->conditions as $cond)
{
list($errcode, $link)=$cond->evaluate($vars);
if($errcode<0) return array(0, "$link");
if($errcode==0) continue;
return array(1, $link);
}
return array(0, "NOT SOLVED");
}
}
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// Class: LinkConditionData (non-visible)
// Purpose:
// Attributes:
// Methods:
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
class LinkConditionData{
var $linktype;
var $eorder;
var $code;
var $file;
var $url;
function LinkConditionData(){}
}
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// Class: LinkConditionINT (implements LinkCondition)
// Purpose:
// Attributes:
// Methods:
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
class LinkConditionINT {
var $condition;
var $actions;
var $formats;
var $exec;
var $file_path;
var $url_path;
function LinkConditionINT( $data )
{
if($data==null) return null;
$this->exec=new AELExecutor();
list($ok, $msg)=$this->exec->checkCode( $data->code );
if(!$ok) return null;
$this->condition=$msg;
$this->file_path=$data->file;
$this->url_path=$data->url;
$this->actions=array();
$this->formats=array();
include( DB );
$db=mysql_connect( $DB_HOST, $DB_USER, $DB_PASSWD );
mysql_selectdb( $DB_DB, $db );
$qry="select f.name, f.text, f.extensions
from flxFILEFORMATS f, flxLINKTYPECONDITIONSFILEFORMATS cf
where cf.linktype='".$data->linktype."'
and cf.eval_order='".$data->eorder."'
and f.name=cf.fname";
$qh=mysql_query($qry, $db);
while($row=mysql_fetch_array($qh))
{
$d=new LinkFileFormatData();
list($d->name, $d->description, $ext)=$row;
$d->extensions=array();
if(trim($ext)!="")
$d->extensions=explode("|", $ext);
$format=new LinkFileFormat( $d );
if($format==null) continue;
array_push($this->formats, $format);
}
$qry="select el_code
from flxLINKTYPECONDITIONSACTIONS
where linktype='".$data->linktype."'
and eval_order=".$data->eorder."
order by apply_order";
$qh=mysql_query($qry, $db);
while($row=mysql_fetch_array($qh))
{
$d=new LinkActionData();
list($d->code)=$row;
$action=new LinkAction($d);
if(!$action) continue;
array_push($this->actions, $action);
}
mysql_close($db);
}
function evaluate( $vars )
{
list($ok, $res)=$this->exec->execTree( $this->condition, $vars );
if(!$ok) return array(-1, "Error evaluating condtion: $res");
if($res=="FALSE") return array(0, "FALSE");
if(count($this->actions)==0) return array(0, "NO ACTIONS");
$v=new IntVar("LINK");
$generated=false;
foreach($this->actions as $action)
{
list($ok, $res)=$action->getResult( $vars );
if(!$ok) return array(-1, "Error evaluating action: $res");
$file=$this->file_path.$res;
$url=$this->url_path.$res;
if(count($this->formats)>0)
{
foreach($this->formats as $format)
{
foreach($format->composeFilePaths( $file, $url ) as $i)
{
list($full_file, $full_url)=$i;
$testfh=@ fopen($full_file, "r");
if($testfh)
{
$generated=true;
fclose($testfh);
$v->addValue($full_url);
$v->addSFValue("url", $full_url);
$v->addSFValue("file", $full_file);
$v->addSFValue("format_id", $format->getName());
$v->addSFValue("format_desc", $format->getDesc());
$v->inextValue();
}
}
}
}
if($generated===true) break;
$testfh=@ fopen($file, "r");
if($testfh)
{
$generated=true;
fclose($testfh);
$v->addValue($url);
$v->addSFValue("url", $url);
$v->addSFValue("file", $url);
break;
}
}
if($generated)
return array(1, $v);
return array(0, "NO LINK");
}
}
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// Class: LinkFileFormatData (non-visible)
// Purpose:
// Attributes:
// Methods:
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
class LinkFileFormatData {
var $name;
var $description;
var $extensions;
function LinkFileFormatData(){}
}
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// Class: LinkFileFormat
// Purpose:
// Attributes:
// Methods:
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
class LinkFileFormat {
var $description;
var $name;
var $extensions;
function LinkFileFormat( $data )
{
if($data==null) return null;
$this->name=$data->name;
$this->description=$data->description;
$this->extensions=$data->extensions;
}
function getName()
{
return $this->name;
}
function getDesc()
{
return $this->description;
}
function composeFilePaths( $base_path, $base_url )
{
$res=array();
foreach($this->extensions as $ext)
{
$ext=trim($ext);
if($ext=="") continue;
array_push( $res, array($base_path.".".$ext, $base_url.".".$ext) );
}
return $res;
}
}
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// Class: LinkConditionEXT (implements LinkCondition)
// Purpose:
// Attributes:
// Methods:
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
class LinkConditionEXT {
var $condition;
var $action;
var $exec;
function LinkConditionEXT( $data )
{
if($data==null) return null;
$this->exec=new AELExecutor();
list($ok, $msg)=$this->exec->checkCode( $data->code );
if(!$ok) return null;
$this->condition=$msg;
include( DB );
$db=mysql_connect( $DB_HOST, $DB_USER, $DB_PASSWD );
mysql_selectdb( $DB_DB, $db );
$qry="select el_code
from flxLINKTYPECONDITIONSACTIONS
where linktype='".$data->linktype."'
and eval_order=".$data->eorder."
order by apply_order";
$qh=mysql_query($qry, $db);
$d=new LinkActionData();
list($d->code)=mysql_fetch_array($qh);
mysql_close($db);
if(!$d->code) return null;
if(!($this->action=new LinkAction($d))) return null;
}
function evaluate( $vars )
{
list($ok, $res)=$this->exec->execTree( $this->condition, $vars );
if(!$ok) return array(-1, "Error evaluating condtion: $res");
if($res=="FALSE") return array(0, "FALSE");
list($ok, $res)=$this->action->getResult( $vars );
if(!$ok) return array(-1, "Error evaluating action: $res");
$v=new IntVar("LINK");
$v->addValue($res);
$v->addSFValue("url", "$res");
$v->inextValue();
return array(1, $v);
}
}
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// Class: LinkActionData (non-visible)
// Purpose:
// Attributes:
// Methods:
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
class LinkActionData {
var $code;
function LinkActionData(){}
}
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// Class: LinkAction
// Purpose:
// Attributes:
// Methods:
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
class LinkAction {
var $action;
var $exec;
function LinkAction($data)
{
if($data==null) return null;
$this->exec=new AELExecutor();
list($ok, $msg)=$this->exec->checkCode( $data->code );
if(!$ok) return null;
$this->action=$msg;
}
function getResult($vars)
{
return $this->exec->execTree( $this->action, $vars );
}
}
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// Class: LinkResolver
// Purpose:
// Attributes:
// Methods:
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
class LinkResolver {
var $db;
var $a;
var $links;
function LinkResolver() {
$this->links=array();
}
function & getInstance()
{
static $instance;
if(!isset($instance))
{
$instance=new LinkResolver();
}
return $instance;
}
function getLink($type)
{
$type=strtoupper(trim($type));
if(isset($this->links[$type]))
{
return $this->links[$type];
}
else
{
include( DB );
$db=mysql_connect( $DB_HOST, $DB_USER, $DB_PASSWD );
mysql_selectdb( $DB_DB, $db );
$qry="select linktype
from flxLINKTYPES
where linktype='$type'";
$qh=mysql_query($qry);
if(mysql_num_rows($qh)!="1") return null;
mysql_close($db);
$link=new Link($type);
if($link==null) return null;
$this->links[$type]=$link;
return $link;
}
}
function destroy()
{
//mysql_close( $this->db );
}
function checkLink( $linktype, $params ) {
$l=$this->getLink( $linktype );
if($l==null) return 0;
return $l->check($params);
}
function solveLink( $linktype, $params ) {
$l=$this->getLink($linktype);
if($l==null) return array(0, "Incorrect link");
list($ok, $res)=$l->solve($params);
if(!$ok) return array(0, $res);
return array(1, $link_url, $res);
}
}//end class
?>
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