<?php

/**

 * Zend Framework

 *

 * LICENSE

 *

 * This source file is subject to the new BSD license that is bundled

 * with this package in the file LICENSE.txt.

 * It is also available through the world-wide-web at this URL:

 * http://framework.zend.com/license/new-bsd

 * If you did not receive a copy of the license and are unable to

 * obtain it through the world-wide-web, please send an email

 * to license@zend.com so we can send you a copy immediately.

 *

 * @category   Zend

 * @package    Zend_Search_Lucene

 * @subpackage Document

 * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)

 * @license    http://framework.zend.com/license/new-bsd     New BSD License

 * @version    $Id: OpenXml.php 20096 2010-01-06 02:05:09Z bkarwin $

 */

/** Zend_Search_Lucene_Document */

require_once 'Zend/Search/Lucene/Document.php';

/**

 * OpenXML document.

 *

 * @category   Zend

 * @package    Zend_Search_Lucene

 * @subpackage Document

 * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)

 * @license    http://framework.zend.com/license/new-bsd     New BSD License

 */

abstract class Zend_Search_Lucene_Document_OpenXml extends Zend_Search_Lucene_Document

{

    /**

     * Xml Schema - Relationships

     *

     * @var string

     */

    const SCHEMA_RELATIONSHIP = 'http://schemas.openxmlformats.org/package/2006/relationships';

    /**

     * Xml Schema - Office document

     *

     * @var string

     */

    const SCHEMA_OFFICEDOCUMENT = 'http://schemas.openxmlformats.org/officeDocument/2006/relationships/officeDocument';

    /**

     * Xml Schema - Core properties

     *

     * @var string

     */

    const SCHEMA_COREPROPERTIES = 'http://schemas.openxmlformats.org/package/2006/relationships/metadata/core-properties';

    /**

     * Xml Schema - Dublin Core

     *

     * @var string

     */

    const SCHEMA_DUBLINCORE = 'http://purl.org/dc/elements/1.1/';

    /**

     * Xml Schema - Dublin Core Terms

     *

     * @var string

     */

    const SCHEMA_DUBLINCORETERMS = 'http://purl.org/dc/terms/';

    /**

     * Extract metadata from document

     *

     * @param ZipArchive $package    ZipArchive OpenXML package

     * @return array    Key-value pairs containing document meta data

     */

    protected function extractMetaData(ZipArchive $package)

    {

        // Data holders

        $coreProperties = array();

        // Read relations and search for core properties

        $relations = simplexml_load_string($package->getFromName("_rels/.rels"));

        foreach ($relations->Relationship as $rel) {

            if ($rel["Type"] == Zend_Search_Lucene_Document_OpenXml::SCHEMA_COREPROPERTIES) {

                // Found core properties! Read in contents...

                $contents = simplexml_load_string(

                    $package->getFromName(dirname($rel["Target"]) . "/" . basename($rel["Target"]))

                );

                foreach ($contents->children(Zend_Search_Lucene_Document_OpenXml::SCHEMA_DUBLINCORE) as $child) {

                    $coreProperties[$child->getName()] = (string)$child;

                }

                foreach ($contents->children(Zend_Search_Lucene_Document_OpenXml::SCHEMA_COREPROPERTIES) as $child) {

                    $coreProperties[$child->getName()] = (string)$child;

                }

                foreach ($contents->children(Zend_Search_Lucene_Document_OpenXml::SCHEMA_DUBLINCORETERMS) as $child) {

                    $coreProperties[$child->getName()] = (string)$child;

                }

            }

        }

        return $coreProperties;

    }

    /**

     * Determine absolute zip path

     *

     * @param string $path

     * @return string

     */

    protected function absoluteZipPath($path) {

        $path = str_replace(array('/', '\\'), DIRECTORY_SEPARATOR, $path);

        $parts = array_filter(explode(DIRECTORY_SEPARATOR, $path), 'strlen');

        $absolutes = array();

        foreach ($parts as $part) {

            if ('.' == $part) continue;

            if ('..' == $part) {

                array_pop($absolutes);

            } else {

                $absolutes[] = $part;

            }

        }

        return implode('/', $absolutes);

    }

}