ApiQueryPageProps.php

Go to the documentation of this file.

<?php
class ApiQueryPageProps extends ApiQueryBase {

    private $params;

    public function __construct( $query, $moduleName ) {
        parent::__construct( $query, $moduleName, 'pp' );
    }

    public function execute() {
        # Only operate on existing pages
        $pages = $this->getPageSet()->getGoodTitles();
        if ( !count( $pages ) ) {
            # Nothing to do
            return;
        }

        $this->params = $this->extractRequestParams();

        $this->addTables( 'page_props' );
        $this->addFields( array( 'pp_page', 'pp_propname', 'pp_value' ) );
        $this->addWhereFld( 'pp_page', array_keys( $pages ) );

        if ( $this->params['continue'] ) {
            $this->addWhere( 'pp_page >=' . intval( $this->params['continue'] ) );
        }

        if ( $this->params['prop'] ) {
            $this->addWhereFld( 'pp_propname', $this->params['prop'] );
        }

        # Force a sort order to ensure that properties are grouped by page
        # But only if pp_page is not constant in the WHERE clause.
        if ( count( $pages ) > 1 ) {
            $this->addOption( 'ORDER BY', 'pp_page' );
        }

        $res = $this->select( __METHOD__ );
        $currentPage = 0; # Id of the page currently processed
        $props = array();
        $result = $this->getResult();

        foreach ( $res as $row ) {
            if ( $currentPage != $row->pp_page ) {
                # Different page than previous row, so add the properties to
                # the result and save the new page id

                if ( $currentPage ) {
                    if ( !$this->addPageProps( $result, $currentPage, $props ) ) {
                        # addPageProps() indicated that the result did not fit
                        # so stop adding data. Reset props so that it doesn't
                        # get added again after loop exit

                        $props = array();
                        break;
                    }

                    $props = array();
                }

                $currentPage = $row->pp_page;
            }

            $props[$row->pp_propname] = $row->pp_value;
        }

        if ( count( $props ) ) {
            # Add any remaining properties to the results
            $this->addPageProps( $result, $currentPage, $props );
        }
    }

    private function addPageProps( $result, $page, $props ) {
        $fit = $result->addValue( array( 'query', 'pages', $page ), 'pageprops', $props );

        if ( !$fit ) {
            $this->setContinueEnumParameter( 'continue', $page );
        }
        return $fit;
    }

    public function getCacheMode( $params ) {
        return 'public';
    }

    public function getAllowedParams() {
        return array(
            'continue' => null,
            'prop' => array(
                ApiBase::PARAM_ISMULTI => true,
            ),
        );
    }

    public function getParamDescription() {
        return array(
            'continue' => 'When more results are available, use this to continue',
            'prop' => 'Only list these props. Useful for checking whether a certain page uses a certain page prop',
        );
    }

    public function getDescription() {
        return 'Get various properties defined in the page content';
    }

    public function getExamples() {
        return array(
            'api.php?action=query&prop=pageprops&titles=Category:Foo',
        );
    }

    public function getHelpUrls() {
        return 'https://www.mediawiki.org/wiki/API:Properties#pageprops_.2F_pp';
    }
}