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<?php
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/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
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/**
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 * Contains the Pager class
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 *
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 * PHP versions 4 and 5
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 *
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 * LICENSE: Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions are met:
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 * 1. Redistributions of source code must retain the above copyright
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 *    notice, this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    notice, this list of conditions and the following disclaimer in the
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 *    documentation and/or other materials provided with the distribution.
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 * 3. The name of the author may not be used to endorse or promote products
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 *    derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR IMPLIED
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 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE FREEBSD PROJECT OR CONTRIBUTORS BE LIABLE FOR ANY
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 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 *
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 * @category   HTML
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 * @package    Pager
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 * @author     Lorenzo Alberton <l dot alberton at quipo dot it>
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 * @author     Richard Heyes <richard@phpguru.org>
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 * @copyright  2003-2006 Lorenzo Alberton, Richard Heyes
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 * @license    http://www.debian.org/misc/bsd.license  BSD License (3 Clause)
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 * @version    CVS: $Id: Pager.php,v 1.2 2007-11-06 10:54:04 jp_milcent Exp $
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 * @link       http://pear.php.net/package/Pager
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 */
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/**
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 * Pager - Wrapper class for [Sliding|Jumping]-window Pager
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 * Usage examples can be found in the PEAR manual
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 *
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 * @category   HTML
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 * @package    Pager
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 * @author     Lorenzo Alberton <l dot alberton at quipo dot it>
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 * @author     Richard Heyes <richard@phpguru.org>,
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 * @copyright  2003-2005 Lorenzo Alberton, Richard Heyes
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 * @license    http://www.php.net/license/3_0.txt  PHP License 3.0
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 * @link       http://pear.php.net/package/Pager
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 */
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class Pager
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{
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    // {{{ Pager()
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    /**
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     * Constructor
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     *
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     * -------------------------------------------------------------------------
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     * VALID options are (default values are set some lines before):
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     *  - mode       (string): "Jumping" or "Sliding"  -window - It determines
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     *                         pager behaviour. See the manual for more details
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     *  - totalItems (int):    # of items to page.
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     *  - perPage    (int):    # of items per page.
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     *  - delta      (int):    # of page #s to show before and after the current
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     *                         one
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     *  - linkClass  (string): name of CSS class used for link styling.
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     *  - append     (bool):   if true pageID is appended as GET value to the
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     *                         URL - if false it is embedded in the URL
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     *                         according to "fileName" specs
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     *  - httpMethod (string): Specifies the HTTP method to use. Valid values
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     *                         are 'GET' or 'POST'
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     *                         according to "fileName" specs
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     *  - importQuery (bool):  if true (default behaviour), variables and
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     *                         values are imported from the submitted data
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     *                         (query string) and used in the generated links
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     *                         otherwise they're ignored completely
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     *  - path       (string): complete path to the page (without the page name)
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     *  - fileName   (string): name of the page, with a %d if append=true
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     *  - urlVar     (string): name of pageNumber URL var, for example "pageID"
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     *  - altPrev    (string): alt text to display for prev page, on prev link.
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     *  - altNext    (string): alt text to display for next page, on next link.
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     *  - altPage    (string): alt text to display before the page number.
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     *  - prevImg    (string): sth (it can be text such as "<< PREV" or an
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     *                         <img/> as well...) to display instead of "<<".
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     *  - nextImg    (string): same as prevImg, used for NEXT link, instead of
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     *                         the default value, which is ">>".
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     *  - separator  (string): what to use to separate numbers (can be an
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     *                         <img/>, a comma, an hyphen, or whatever.
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     *  - spacesBeforeSeparator
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     *               (int):    number of spaces before the separator.
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     *  - firstPagePre (string):
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     *                         string used before first page number (can be an
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     *                         <img/>, a "{", an empty string, or whatever.
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     *  - firstPageText (string):
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     *                         string used in place of first page number
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     *  - firstPagePost (string):
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     *                         string used after first page number (can be an
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     *                         <img/>, a "}", an empty string, or whatever.
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     *  - lastPagePre (string):
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     *                         similar to firstPagePre.
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     *  - lastPageText (string):
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     *                         similar to firstPageText.
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     *  - lastPagePost (string):
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     *                         similar to firstPagePost.
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     *  - spacesAfterSeparator
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     *               (int):    number of spaces after the separator.
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     *  - firstLinkTitle (string):
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     *                          string used as title in <link rel="first"> tag
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     *  - lastLinkTitle (string):
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     *                          string used as title in <link rel="last"> tag
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     *  - prevLinkTitle (string):
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     *                          string used as title in <link rel="prev"> tag
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     *  - nextLinkTitle (string):
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     *                          string used as title in <link rel="next"> tag
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     *  - curPageLinkClassName
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     *               (string): name of CSS class used for current page link.
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     *  - clearIfVoid(bool):   if there's only one page, don't display pager.
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     *  - extraVars (array):   additional URL vars to be added to the querystring
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     *  - excludeVars (array): URL vars to be excluded in the querystring
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     *  - itemData   (array):  array of items to page.
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     *  - useSessions (bool):  if true, number of items to display per page is
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     *                         stored in the $_SESSION[$_sessionVar] var.
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     *  - closeSession (bool): if true, the session is closed just after R/W.
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     *  - sessionVar (string): name of the session var for perPage value.
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     *                         A value != from default can be useful when
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     *                         using more than one Pager istance in the page.
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     *  - pearErrorMode (constant):
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     *                         PEAR_ERROR mode for raiseError().
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     *                         Default is PEAR_ERROR_RETURN.
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     * -------------------------------------------------------------------------
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     * REQUIRED options are:
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     *  - fileName IF append==false (default is true)
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     *  - itemData OR totalItems (if itemData is set, totalItems is overwritten)
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     * -------------------------------------------------------------------------
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     *
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     * @param mixed $options    An associative array of option names and
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     *                          their values.
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     * @access public
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     */
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    function Pager($options = array())
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    {
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        //this check evaluates to true on 5.0.0RC-dev,
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        //so i'm using another one, for now...
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        //if (version_compare(phpversion(), '5.0.0') == -1) {
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        if (get_class($this) == 'pager') { //php4 lowers class names
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            // assign factoried method to this for PHP 4
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            eval('$this = Pager::factory($options);');
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        } else { //php5 is case sensitive
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            $msg = 'Pager constructor is deprecated.'
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                  .' You must use the "Pager::factory($params)" method'
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                  .' instead of "new Pager($params)"';
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            trigger_error($msg, E_USER_ERROR);
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        }
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    }
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    // }}}
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    // {{{ factory()
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    /**
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     * Return a pager based on $mode and $options
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     *
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     * @param  array $options Optional parameters for the storage class
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     * @return object Object   Storage object
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     * @static
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     * @access public
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     */
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    static function &factory($options = array())
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    {
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        $mode = (isset($options['mode']) ? ucfirst($options['mode']) : 'Jumping');
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        $classname = 'Pager_' . $mode;
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        $classfile = 'Pager' . DIRECTORY_SEPARATOR . $mode . '.php';
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        // Attempt to include a custom version of the named class, but don't treat
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        // a failure as fatal.  The caller may have already included their own
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        // version of the named class.
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        if (!class_exists($classname)) {
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            include_once $classfile;
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        }
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        // If the class exists, return a new instance of it.
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        if (class_exists($classname)) {
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            $pager =& new $classname($options);
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            return $pager;
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        }
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        $null = null;
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        return $null;
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    }
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    // }}}
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}
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?>