ApiQueryIWLinks.php

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<?php
class ApiQueryIWLinks extends ApiQueryBase {

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

        public function execute() {
                if ( $this->getPageSet()->getGoodTitleCount() == 0 ) {
                        return;
                }

                $params = $this->extractRequestParams();

                if ( isset( $params['title'] ) && !isset( $params['prefix'] ) ) {
                        $this->dieUsageMsg( array( 'missingparam', 'prefix' ) );
                }

                $this->addFields( array(
                        'iwl_from',
                        'iwl_prefix',
                        'iwl_title'
                ) );

                $this->addTables( 'iwlinks' );
                $this->addWhereFld( 'iwl_from', array_keys( $this->getPageSet()->getGoodTitles() ) );

                if ( !is_null( $params['continue'] ) ) {
                        $cont = explode( '|', $params['continue'] );
                        if ( count( $cont ) != 3 ) {
                                $this->dieUsage( 'Invalid continue param. You should pass the ' .
                                        'original value returned by the previous query', '_badcontinue' );
                        }
                        $op = $params['dir'] == 'descending' ? '<' : '>';
                        $db = $this->getDB();
                        $iwlfrom = intval( $cont[0] );
                        $iwlprefix = $db->addQuotes( $cont[1] );
                        $iwltitle = $db->addQuotes( $cont[2] );
                        $this->addWhere(
                                "iwl_from $op $iwlfrom OR " .
                                "(iwl_from = $iwlfrom AND " .
                                "(iwl_prefix $op $iwlprefix OR " .
                                "(iwl_prefix = $iwlprefix AND " .
                                "iwl_title $op= $iwltitle)))"
                        );
                }

                $sort = ( $params['dir'] == 'descending' ? ' DESC' : '' );
                if ( isset( $params['prefix'] ) ) {
                        $this->addWhereFld( 'iwl_prefix', $params['prefix'] );
                        if ( isset( $params['title'] ) ) {
                                $this->addWhereFld( 'iwl_title', $params['title'] );
                                $this->addOption( 'ORDER BY', 'iwl_from' . $sort );
                        } else {
                                $this->addOption( 'ORDER BY', array(
                                                'iwl_title' . $sort,
                                                'iwl_from' . $sort
                                ));
                        }
                } else {
                        // Don't order by iwl_from if it's constant in the WHERE clause
                        if ( count( $this->getPageSet()->getGoodTitles() ) == 1 ) {
                                $this->addOption( 'ORDER BY', 'iwl_prefix' . $sort );
                        } else {
                                $this->addOption( 'ORDER BY', array (
                                                'iwl_from' . $sort,
                                                'iwl_prefix' . $sort
                                ));
                        }
                }

                $this->addOption( 'LIMIT', $params['limit'] + 1 );
                $res = $this->select( __METHOD__ );

                $count = 0;
                foreach ( $res as $row ) {
                        if ( ++$count > $params['limit'] ) {
                                // We've reached the one extra which shows that
                                // there are additional pages to be had. Stop here...
                                $this->setContinueEnumParameter( 'continue', "{$row->iwl_from}|{$row->iwl_prefix}|{$row->iwl_title}" );
                                break;
                        }
                        $entry = array( 'prefix' => $row->iwl_prefix );

                        if ( $params['url'] ) {
                                $title = Title::newFromText( "{$row->iwl_prefix}:{$row->iwl_title}" );
                                if ( $title ) {
                                        $entry['url'] = wfExpandUrl( $title->getFullURL(), PROTO_CURRENT );
                                }
                        }

                        ApiResult::setContent( $entry, $row->iwl_title );
                        $fit = $this->addPageSubItem( $row->iwl_from, $entry );
                        if ( !$fit ) {
                                $this->setContinueEnumParameter( 'continue', "{$row->iwl_from}|{$row->iwl_prefix}|{$row->iwl_title}" );
                                break;
                        }
                }
        }

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

        public function getAllowedParams() {
                return array(
                        'url' => false,
                        'limit' => array(
                                ApiBase::PARAM_DFLT => 10,
                                ApiBase::PARAM_TYPE => 'limit',
                                ApiBase::PARAM_MIN => 1,
                                ApiBase::PARAM_MAX => ApiBase::LIMIT_BIG1,
                                ApiBase::PARAM_MAX2 => ApiBase::LIMIT_BIG2
                        ),
                        'continue' => null,
                        'prefix' => null,
                        'title' => null,
                        'dir' => array(
                                ApiBase::PARAM_DFLT => 'ascending',
                                ApiBase::PARAM_TYPE => array(
                                        'ascending',
                                        'descending'
                                )
                        ),
                );
        }

        public function getParamDescription() {
                return array(
                        'url' => 'Whether to get the full URL',
                        'limit' => 'How many interwiki links to return',
                        'continue' => 'When more results are available, use this to continue',
                        'prefix' => 'Prefix for the interwiki',
                        'title' => "Interwiki link to search for. Must be used with {$this->getModulePrefix()}prefix",
                        'dir' => 'The direction in which to list',
                );
        }

        public function getResultProperties() {
                return array(
                        '' => array(
                                'prefix' => 'string',
                                'url' => array(
                                        ApiBase::PROP_TYPE => 'string',
                                        ApiBase::PROP_NULLABLE => true
                                ),
                                '*' => 'string'
                        )
                );
        }

        public function getDescription() {
                return 'Returns all interwiki links from the given page(s)';
        }

        public function getPossibleErrors() {
                return array_merge( parent::getPossibleErrors(), array(
                        array( 'missingparam', 'prefix' ),
                        array( 'code' => '_badcontinue', 'info' => 'Invalid continue param. You should pass the original value returned by the previous query' ),
                ) );
        }

        public function getExamples() {
                return array(
                        'api.php?action=query&prop=iwlinks&titles=Main%20Page' => 'Get interwiki links from the [[Main Page]]',
                );
        }

        public function getVersion() {
                return __CLASS__ . ': $Id$';
        }
}