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<?php
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// $Id: translation_helpers.module,v 1.5 2009/08/17 04:54:15 nedjo Exp $
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/**
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* @file
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* Provides methods for other modules to use with translated content.
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*/
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/**
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* Implementation of hook_nodeapi().
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*
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* Manages translation information for nodes.
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*/
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function translation_helpers_nodeapi(&$node, $op, $teaser, $page) {
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// Only act if we are dealing with a content type supporting translations.
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if ($op == 'delete' && translation_supported_type($node->type)) {
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translation_helpers_invoke_translation_change($node);
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}
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}
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/**
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* Call hook_nodeapi() to respond to a change in source translation.
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*
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* Follows logic in translation_remove_from_set().
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*
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* Sample implementation:
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* <code>
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* function example_nodeapi() {
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* switch ($op) {
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* case 'translation_change':
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* if (isset($node->translation_change)) {
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* // If there is only one node remaining, track by nid rather than tnid. Otherwise, use
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* // the new tnid.
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* $new = $node->translation_change['new_tnid'] == 0 ? $node->translation_change['remaining_nid'] : $node->translation_change['new_tnid'];
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* db_query('UPDATE {example} SET id = %d WHERE id = %d', $new, $node->translation_change['old_tnid']);
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* }
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* break;
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* }
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* }
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* </code>
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*/
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function translation_helpers_invoke_translation_change($node) {
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if (isset($node->tnid)) {
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if (db_result(db_query('SELECT COUNT(*) FROM {node} WHERE tnid = %d', $node->tnid)) == 1) {
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// There is only one node left in the set.
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$node->translation_change = array(
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'old_tnid' => $node->tnid,
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'new_tnid' => 0,
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// Determine the remaining former member of the translation set.
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// May be needed e.g. to reassign existing data from the tnid to this nid.
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'remaining_nid' => db_result(db_query('SELECT nid FROM {node} WHERE tnid = %d', $node->tnid)),
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);
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// Allow other modules to respond to the removal of this translation set.
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node_invoke_nodeapi($node, 'translation_change');
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}
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else {
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// If the node being removed was the source of the translation set,
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// we pick a new source - preferably one that is up to date.
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if ($node->tnid == $node->nid) {
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$node->translation_change = array(
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'old_tnid' => $node->tnid,
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'new_tnid' => db_result(db_query('SELECT nid FROM {node} WHERE tnid = %d ORDER BY translate ASC, nid ASC', $node->tnid)),
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);
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// Allow other modules to respond to the changed source for this translation set.
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node_invoke_nodeapi($node, 'translation_change');
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}
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}
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}
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}
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/**
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* Return the source translation of a node.
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*/
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function translation_helpers_get_source($node) {
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if (isset($node->tnid) && translation_supported_type($node->type)) {
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// A node can be its own source.
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if ($node->nid == $node->tnid) {
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return $node;
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}
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return node_load($node->tnid);
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}
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return FALSE;
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}
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/**
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* Return the translation of a node in a given language.
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*/
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function translation_helpers_get_translation($node, $language) {
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if (isset($node->tnid) && translation_supported_type($node->type)) {
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$translations = translation_node_get_translations($node->tnid);
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if (isset($translations[$language])) {
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return node_load($translations[$language]->nid);
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}
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}
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return FALSE;
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}
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