@ -21,6 +21,76 @@ function islandora_rules_event_info() {
),
),
),
'islandora_datastream_ingested' => array(
'group' => t('Islandora'),
'label' => t('Datastream ingested'),
'variables' => array(
'object' => array(
'type' => 'islandora_object',
'label' => t('The ingested object'),
'description' => t('A Tuque object for the Fedora object on which the datastream exists, as an entity.'),
),
'datastream' => array(
'type' => 'islandora_datastream',
'label' => t('Datastream ID'),
'description' => t('The ID of the ingested datastream.'),
),
),
),
'islandora_object_modified' => array(
'group' => t('Islandora'),
'label' => t('Object modified'),
'variables' => array(
'object' => array(
'type' => 'islandora_object',
'label' => t('The modified object'),
'description' => t('A Tuque object for the modified Fedora object, as an entity.'),
),
),
),
'islandora_datastream_modified' => array(
'group' => t('Islandora'),
'label' => t('Datastream modified'),
'variables' => array(
'object' => array(
'type' => 'islandora_object',
'label' => t('The modified object'),
'description' => t('A Tuque object for the Fedora object on which the datastream exists, as an entity.'),
),
'datastream' => array(
'type' => 'islandora_datastream',
'label' => t('Datastream'),
'description' => t('The modified datastream.'),
),
),
),
'islandora_object_purged' => array(
'group' => t('Islandora'),
'label' => t('Object purged'),
'variables' => array(
'object' => array(
'type' => 'text',
'label' => t('Object ID'),
'description' => t('The ID of the purged object.'),
),
),
),
'islandora_datastream_purged' => array(
'group' => t('Islandora'),
'label' => t('Datastream purged'),
'variables' => array(
'object' => array(
'type' => 'islandora_object',
'label' => t('Object'),
'description' => t('A Tuque object for the Fedora object on which the datastream existed, as an entity.'),
),
'datastream' => array(
'type' => 'text',
'label' => t('Datastream ID'),
'description' => t('The identifier of the purged datastream.'),
),
),
),
);
}
@ -60,6 +130,35 @@ function islandora_rules_relationship_parameter_array() {
);
}
/**
* Helper function; get default parameters for the XPath condition and action.
*/
function islandora_rules_base_xpath_parameters() {
return array(
'object' => array(
'type' => 'islandora_object',
'label' => t('Object'),
'description' => t('The object containing the datastream to check.'),
),
'datastream_id' => array(
'type' => 'text',
'label' => t('Datastream'),
'description' => t('The identifier of the XML datastream to check.'),
),
'xpath' => array(
'type' => 'text',
'label' => t('XPath'),
'description' => t('An XPath to evaluate.'),
),
'xpath_namespaces' => array(
'type' => 'taxonomy_vocabulary',
'label' => t('XPath Namespace Taxonomy'),
'description' => t('A flat taxonomy of which the terms are namespace prefixes and the description contains the URI for the namespace.'),
),
);
}
/**
* Implements hook_rules_condition_info().
*/
@ -71,6 +170,27 @@ function islandora_rules_condition_info() {
'group' => t('Islandora'),
'parameter' => islandora_rules_relationship_parameter_array(),
);
$cond['islandora_object_has_datastream'] = array(
'label' => t('Check object for existence of a datastream'),
'group' => t('Islandora'),
'parameter' => array(
'object' => array(
'type' => 'islandora_object',
'label' => t('Object'),
'description' => t('The object containing the datastream to check.'),
),
'datastream_id' => array(
'type' => 'text',
'label' => t('Datastream'),
'description' => t('The identifier of the datastream to check.'),
),
),
);
$cond['islandora_rules_datastream_has_xpath'] = array(
'label' => t('Check for an XPath match in an XML datastream'),
'group' => t('Islandora'),
'parameter' => islandora_rules_base_xpath_parameters(),
);
return $cond;
}
@ -92,8 +212,132 @@ function islandora_rules_action_info() {
'group' => t('Islandora'),
'parameter' => islandora_rules_relationship_parameter_array(),
);
$cond['islandora_rules_datastream_load'] = array(
'label' => t('Load a datastream from an object.'),
'group' => t('Islandora'),
'parameter' => array(
'object' => array(
'type' => 'islandora_object',
'label' => t('Object'),
'description' => t('A Tuque object for the Fedora object from which to load the datastream, as an entity.'),
),
'datastream_id' => array(
'type' => 'text',
'label' => t('Datastream ID'),
'description' => t('A string containing the identity of the datastream to load from the object.'),
),
),
'provides' => array(
'datastream' => array(
'type' => 'islandora_datastream',
'label' => t('Loaded datastream instance'),
),
),
);
$cond['islandora_rules_datastream_load_domxpath'] = array(
'label' => t('Load a DOMXPath for a given XML.'),
'group' => t('Islandora DOMXPath'),
'parameter' => array(
'datastream' => array(
'type' => 'text',
'label' => t('XML'),
'description' => t('A string containing the XML to load.'),
),
),
'provides' => array(
'islandora_domxpath' => array(
'type' => 'islandora_domxpath',
'label' => t('Loaded DOMXPath instance'),
),
),
);
$cond['islandora_rules_datastream_load_xpath'] = array(
'label' => t('Load a DOMXPath from a datastream.'),
'group' => t('Islandora DOMXPath'),
'parameter' => array(
'datastream' => array(
'type' => 'islandora_datastream',
'label' => t('Datastream'),
'description' => t('A datastream containing the XML to load.'),
),
),
'provides' => array(
'islandora_domxpath' => array(
'type' => 'islandora_domxpath',
'label' => t('Loaded DOMXPath instance'),
),
),
);
$cond['islandora_rules_datastream_load_namespace_vocab'] = array(
'label' => t('Register namespaces on a DOMXPath instance.'),
'group' => t('Islandora DOMXPath'),
'parameter' => array(
'value' => array(
'type' => 'islandora_domxpath',
'label' => t('DOMXPath instance'),
'description' => t('The DOMXPath instance on which to register the namespaces.'),
),
'xpath_namespaces' => array(
'type' => 'taxonomy_vocabulary',
'label' => t('XPath Namespace Taxonomy'),
'description' => t('A flat taxonomy of which the terms are namespace prefixes and the description contains the URI for the namespace.'),
),
),
);
$cond['islandora_rules_datastream_query_xpath'] = array(
'label' => t('Query nodes from DOMXPath instance.'),
'group' => t('Islandora DOMXPath'),
'parameter' => array(
'xpath' => array(
'type' => 'islandora_domxpath',
'label' => t('DOMXPath instance'),
'description' => t('The DOMXPath instance on which to perform the query.'),
),
'query' => array(
'type' => 'text',
'label' => t('XPath query'),
'description' => t('The XPath query to perform.'),
),
'context_node' => array(
'type' => 'islandora_domnode',
'label' => t('Context Node'),
'description' => t('If provided, the query will be performed relative to the provided node.'),
'optional' => TRUE,
'default value' => NULL,
'allow null' => TRUE,
),
),
'provides' => array(
'nodes' => array(
'type' => 'list< islandora_domnode > ',
'label' => t('Queried DOMNode elements'),
),
),
);
$cond['islandora_rules_datastream_set_xpath'] = array(
'label' => t('Set value in elements matched by an XPath in an XML datastream'),
'group' => t('Islandora'),
'parameter' => islandora_rules_base_xpath_parameters() + array(
'value' => array(
'type' => 'text',
'label' => t('Value'),
'description' => t('The value to set in the XML on elements matched by the XPath.'),
),
),
);
return $cond;
}
/**
* Rules action callback; grab a datastream from an object.
*/
function islandora_rules_datastream_load(AbstractObject $object, $datastream_id) {
return array('datastream' => $object[$datastream_id]);
}
/**
* Checks that there is a relationship match on the given object.
*
@ -133,3 +377,202 @@ function islandora_object_remove_relationship($sub, $pred_uri, $pred, $object, $
function islandora_object_add_relationship($sub, $pred_uri, $pred, $object, $type) {
$sub->relationships->add($pred_uri, $pred, $object, $type);
}
/**
* Rules Action callback; instantiate a DOMXPath with some XML.
*/
function islandora_rules_datastream_load_domxpath($string) {
$doc = new DOMDocument();
$doc->loadXML($string);
$xpath = new DOMXPath($doc);
return array('islandora_domxpath' => $xpath);
}
/**
* Rules Action callback; load namespaces onto a DOMXPath instance.
*
* @param DOMXPath $xpath
* A DOMXPath instance.
* @param object $xpath_vocab
* A loaded Drupal taxonomy vocabulary object, in which terms are understood
* to be namespace prefixes and descriptions are the namespace URIs.
*/
function islandora_rules_datastream_load_namespace_vocab($xpath, $xpath_vocab) {
foreach (taxonomy_get_tree($xpath_vocab->vid, 0, 1, FALSE) as $term) {
$xpath->registerNamespace($term->name, $term->description);
}
}
/**
* Rules XPath helper; grab the datastream content and build a DOMXPath.
*/
function islandora_rules_datastream_load_xpath(AbstractDatastream $datastream, $xpath_vocab) {
$result = islandora_rules_datastream_load_domxpath($datastream->content, $xpath_vocab);
islandora_rules_datastream_load_namespace_vocab($result['islandora_domxpath'], $xpath_vocab);
return $result;
}
/**
* Rules Condition callback; test that an XPath returns a non-empty result set.
*/
function islandora_rules_datastream_has_xpath(AbstractObject $object, $datastream_id, $search_xpath, $xpath_vocab) {
$datastream = $object[$datastream_id];
$xpath = islandora_rules_datastream_load_xpath($datastream, $xpath_vocab);
$result = $xpath['islandora_domxpath']->query($search_xpath);
return $result->length > 0;
}
/**
* Rules Action callback; set the value of all matched nodes.
*/
function islandora_rules_datastream_set_xpath(AbstractObject $object, $datastream_id, $search_xpath, $xpath_vocab, $value) {
$datastream = $object[$datastream_id];
$xpath = islandora_rules_datastream_load_xpath($datastream, $xpath_vocab);
$result = $xpath['islandora_domxpath']->query($search_xpath);
foreach ($result as $node) {
$node->nodeValue = $value;
}
$datastream->content = $xpath['islandora_domxpath']->document->saveXML();
}
/**
* Implements hook_rules_data_info().
*/
function islandora_rules_data_info() {
return array(
'islandora_domxpath' => array(
'label' => t('DOMXPath instance'),
'group' => t('Islandora'),
'property info' => array(
'content' => array(
'type' => 'text',
'label' => t('XML Content'),
'computed' => TRUE,
'getter callback' => 'islandora_rules_get_domxpath_document_content',
'token type' => 'string',
),
),
'wrap' => TRUE,
),
'islandora_domnode' => array(
'label' => t('DOMNode instance'),
'group' => t('Islandora'),
'property info' => array(
'node_value' => array(
'type' => 'text',
'label' => t('Node value'),
'computed' => TRUE,
'getter callback' => 'islandora_rules_property_get',
'setter callback' => 'islandora_rules_property_set',
'property' => 'nodeValue',
'token type' => 'string',
),
'text_content' => array(
'type' => 'text',
'label' => t('Text content'),
'computed' => TRUE,
'getter callback' => 'islandora_rules_property_get',
'property' => 'textContent',
'token type' => 'string',
),
),
'wrap' => TRUE,
),
'islandora_domelement' => array(
'label' => t('DOMElement instance'),
'group' => t('Islandora'),
'parent' => 'islandora_domnode',
'wrap' => TRUE,
),
);
}
/**
* Property setter helper; set a property on an object.
*
* In Rules, properties can contain lowercase and numeric characters. Since
* we want to refer to "nodeValue", we have to step around the Rules constraint.
*
* @param object $data
* The object on which to set the property, described by $info['property'].
* @param array $options
* An array of options... Not sure how it's used? Not touched by us, in any
* case. :P
* @param string $name
* The name of the property to set, as used by Rules.
* @param string $type
* The type of object on which the property is being set, as used by Rules.
* @param array $info
* An associative array describing this property. In addition to that
* required by Rules/the Entity API, should contain:
* - property: A string indicate the actual property on the $data we wish to
* set.
*/
function islandora_rules_property_get($data, array $options, $name, $type, $info) {
return $data->$info['property'];
}
/**
* Property setter helper; set a property on an object.
*
* In Rules, properties can contain lowercase and numeric characters. Since
* we want to refer to "nodeValue", we have to step around the Rules constraint.
*
* @param object $data
* The object on which to set the property, described by $info['property'].
* @param string $name
* The name of the property to set, as used by Rules.
* @param mixed $value
* The value to set on the property.
* @param string $langcode
* A string indicating the language being set, or NULL.
* @param string $type
* The type of object on which the property is being set, as used by Rules.
* @param array $info
* An associative array describing this property. In addition to that
* required by Rules/the Entity API, should contain:
* - property: A string indicate the actual property on the $data we wish to
* set.
*/
function islandora_rules_property_set(& $data, $name, $value, $langcode, $type, $info) {
$data->$info['property'] = $value;
}
/**
* Rules property "get" callback; get XML contained in a DOMXPath instance.
*
* @param DOMXPath $xpath
* A DOMXPath instance.
*
* @return string
* The XML contained inside of the DOMXPath instance.
*/
function islandora_rules_get_domxpath_document_content(DOMXPath $xpath) {
return $xpath->document->saveXML();
}
/**
* Rules action callback; perform a query on a DOMXPath instance.
*
* @param DOMXPath $xpath
* A DOMXPath instance.
* @param string $query
* An XPath query.
* @param DOMNode $context_node
* An optional DOMNode. If provided, the query will be performed relative to
* the given node.
*
* @return array
* An array containing:
* - nodes: An array containing the results of the query.
*/
function islandora_rules_datastream_query_xpath(DOMXPath $xpath, $query, DOMNode $context_node = NULL) {
return array('nodes' => iterator_to_array($xpath->query($query, $context_node)));
}
/**
* Rules condition callback; check for the datastream on an object.
*/
function islandora_object_has_datastream(AbstractObject $object, $datastream_id) {
return isset($object[$datastream_id]);
}
Daniel Aitken
10 years ago