Drupal modules for browsing and managing Fedora-based digital repositories.
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<?php
// $Id$
module_load_include('inc', 'fedora_repository', 'XMLDatastream');
class CollectionPolicy extends XMLDatastream {
static $SCHEMA_URI = 'http://syn.lib.umanitoba.ca/collection_policy.xsd';
static $DEFAULT_DSID = 'COLLECTION_POLICY';
private $staging_area=NULL;
/**
* Gets the default DSID to use for ContentModel datastreams.
*
* @return string $default_dsid
*/
static function getDefaultDSID() {
return variable_get('Islandora_Collection_Policy_DSID', CollectionPolicy::$DEFAULT_DSID);
}
/**
* Constructs a new CollectionPolicy object from the specified
* collection PID. If preFetch is disabled, then Islandora will not get the datastream until needed.
* (useful when cacheing)
* Returns FALSE on failure.
*
* @param string $pid
* @param boolean $preFetch = TRUE
* @return CollectionPolicy $ret
*/
static function loadFromCollection($pid, $preFetch=TRUE) {
$ret = FALSE;
module_load_include('inc', 'fedora_repository', 'api/fedora_item');
try {
if (self::validPid($pid)) {
$dsid=CollectionPolicy::getDefaultDSID();
if ($preFetch) {
$fedoraItem = new Fedora_Item($pid);
$ds = $fedoraItem->get_datastream_dissemination($dsid);
} else {
$ds=null;
}
}
if (!empty($ds) || !$preFetch) {
$ret=new CollectionPolicy($ds, $pid, $dsid);
}
}
catch (SOAPException $e) {
$ret = FALSE;
}
return $ret;
}
/**
* Ingests a new Collection Policy datastream to the specified
* PID with the DSID specified. The file should be a valid collection
* policy XML. Returns false on failure.
*
* @param string $pid
* @param string $name
* @param string $cpDsid
* @param string $file
* @return CollectionPolicy $ret
*/
public static function ingestFromFile($pid, $name, $cpDsid, $file) {
$ret = FALSE;
if (($cp = self::loadFromCollection($pid, $cpDsid)) === FALSE && file_exists($file)) {
$cp = new ContentModel(file_get_contents($file), $pid, $cpDsid);
$rootEl = $cp->xml->getElementsByTagName('collection_policy')->item(0);
$rootEl->setAttribute('name', $name);
module_load_include('inc', 'fedora_repository', 'api/fedora_item');
$fedoraItem = new Fedora_Item($pid);
$fedoraItem->add_datastream_from_string($cp->dumpXml(), $cpDsid, $name, 'text/xml', 'X');
$ret = $cp;
}
return $ret;
}
/**
* Ingests a new Collection Policy datastream to the specified
* PID with the DSID specified. Clones the collection policy from the
* source collection pid. Returns false on failure.
*
* @param string $pid
* @param string $name
* @param string $cpDsid
* @param string $copy_collection_pid
* @return CollectionPolicy $ret
*/
public static function ingestFromCollection($pid, $name, $cpDsid, $copy_collection_pid) {
$ret = FALSE;
if (($cp = self::loadFromCollection($pid, $cpDsid)) === FALSE && ($copy_cp = self::loadFromCollection($copy_collection_pid)) !== FALSE && $copy_cp->validate()) {
$newDom = $copy_cp->xml;
$rootEl = $newDom->getElementsByTagName('collection_policy')->item(0);
$rootEl->setAttribute('name', $name);
$cp = new CollectionPolicy($newDom, $pid, $cpDsid);
module_load_include('inc', 'fedora_repository', 'api/fedora_item');
$fedoraItem = new Fedora_Item($pid);
$fedoraItem->add_datastream_from_string($cp->dumpXml(), $cpDsid, $name, 'text/xml', 'X');
$ret = $cp;
}
return $ret;
}
/**
* Ingests a new minimum Collection Policy datastream to the specified
* PID with the DSID specified. Initializes the policy with the specified values.
* Returns false on failure
*
* @param string $pid
* @param string $name
* @param string $cpDsid
* @param string $model_pid
* @param string $model_namespace
* @param string $relationshiop
* @param string $searchField
* @param string $searchValue
* @return CollectionPolicy $ret
*/
public static function ingestBlankPolicy($pid, $name, $policyDsid, $model_pid, $model_namespace, $relationship, $searchField, $searchValue) {
$ret = FALSE;
if (($cp = self::loadFromCollection($pid, $modelDsid)) === FALSE) {
module_load_include('inc', 'fedora_repository', 'ContentModel');
if (($cm = ContentModel::loadFromModel($model_pid)) !== FALSE && $cm->validate()) {
$newDom = new DOMDocument('1.0', 'utf-8');
$newDom->formatOutput = TRUE;
$rootEl = $newDom->createElement('collection_policy');
$rootEl->setAttribute('name', $name);
$rootEl->setAttribute('xmlns', self::$XMLNS);
$rootEl->setAttribute('xmlns:xsi', 'http://www.w3.org/2001/XMLSchema-instance');
$rootEl->setAttribute('xsi:schemaLocation', self::$XMLNS .' '. self::$SCHEMA_URI);
$modelsEl = $newDom->createElement('content_models');
$cmEl = $newDom->createElement('content_model');
$cmEl->setAttribute('name', $cm->getName());
$cmEl->setAttribute('dsid', $cm->dsid);
$cmEl->setAttribute('namespace', $model_namespace);
$cmEl->setAttribute('pid', $cm->pid);
$modelsEl->appendChild($cmEl);
$rootEl->appendChild($modelsEl);
$relEl = $newDom->createElement('relationship', $relationship);
$rootEl->appendChild($relEl);
$searchTermsEl = $newDom->createElement('search_terms');
$newTermEl = $newDom->createElement('term', $searchValue);
$newTermEl->setAttribute('field', $searchField);
$searchTermsEl->appendChild($newTermEl);
$rootEl->appendChild($searchTermsEl);
$newDom->appendChild($rootEl);
$cp = new CollectionPolicy($newDom, $pid, $policyDsid);
module_load_include('inc', 'fedora_repository', 'api/fedora_item');
$fedoraItem = new Fedora_Item($pid);
$fedoraItem->add_datastream_from_string($cp->dumpXml(), $policyDsid, $name, 'text/xml', 'X');
$ret = $cp;
}
}
return $ret;
}
/**
* Constructor
* NOTE: Use the static constructor methods whenever possible.
*
* @param string $xmlStr
* @param string $pid
* @param string $dsid
* @return XMLDatastream $cm
*/
public function __construct($xmlStr, $pid = NULL, $dsid = NULL) {
parent::__construct($xmlStr,$pid,$dsid);
$this->name= 'Collection Policy';
}
/**
* Attempts to convert from the old XML schema to the new by
* traversing the XML DOM and building a new DOM. When done
* $this->xml is replaced by the newly created DOM..
*
* @return void
*/
protected function convertFromOldSchema() {
if ($this->xml == NULL) {
$this->fetchXml();
}
$sXml = simplexml_load_string($this->xml->saveXML());
$newDom = new DOMDocument('1.0', 'utf-8');
$newDom->formatOutput = TRUE;
$rootEl = $newDom->createElement('collection_policy');
$rootEl->setAttribute('name', $sXml['name']);
$rootEl->setAttribute('xmlns', self::$XMLNS);
$rootEl->setAttribute('xmlns:xsi', 'http://www.w3.org/2001/XMLSchema-instance');
$rootEl->setAttribute('xsi:schemaLocation', self::$XMLNS .' '. self::$SCHEMA_URI);
$content_modelsEl = $newDom->createElement('content_models');
foreach ($sXml->contentmodels->contentmodel as $contentmodel) {
$content_modelEl = $newDom->createElement('content_model');
$content_modelEl->setAttribute('name', $contentmodel['name']);
$content_modelEl->setAttribute('dsid', $contentmodel->dsid);
$content_modelEl->setAttribute('namespace', $contentmodel->pid_namespace);
$content_modelEl->setAttribute('pid', $contentmodel->pid);
$content_modelsEl->appendChild($content_modelEl);
}
$rootEl->appendChild($content_modelsEl);
$search_termsEl = $newDom->createElement('search_terms');
foreach ($sXml->search_terms->term as $term) {
$termEl = $newDom->createElement('term', $term->value);
$termEl->setAttribute('field', $term->field);
if (strval($sXml->search_terms->default) == $term->field) {
$termEl->setAttribute('default', 'true');
}
$search_termsEl->appendChild($termEl);
}
$rootEl->appendChild($search_termsEl);
$relationshipEl = $newDom->createElement('relationship', $sXml->relationship);
$rootEl->appendChild($relationshipEl);
$newDom->appendChild($rootEl);
$this->xml = DOMDocument::loadXML($newDom->saveXml());
}
/**
* Gets the name of the relationship to use
* for members of this collection.
* Returns FALSE on failure.
*
* @return string $relationship
*/
public function getRelationship() {
$ret=FALSE;
if ($this->validate()) {
$ret=trim($this->xml->getElementsByTagName('relationship')->item(0)->nodeValue);
}
return $ret;
}
/**
* Sets the name of the relationship to use
* for members of this collection.
* Returns FALSE on failure.
*
* @param string $relationship
* @return boolean $ret
*/
public function setRelationship($relationship) {
$ret=FALSE;
if ($this->validate()) {
$relationshipEl=$this->xml->getElementsByTagName('relationship')->item(0);
$relationshipEl->nodeValue=trim($relationship);
$ret = TRUE;
}
return $ret;
}
/**
* Gets the path to the staging area to use for this
* collection. By default recurses to the parent collection
* if the staging area is undefined
*
* @param BOOLEAN $recurse
* @return string $path
*/
public function getStagingArea($recurse=TRUE) {
$ret=FALSE;
if ($this->validate()) {
if ($this->staging_area === NULL) {
$stagingEl=$this->xml->getElementsByTagName('staging_area');
if ($stagingEl->length > 0) {
$this->staging_area = trim($stagingEl->item(0)->nodeValue);
} elseif ($recurse) {
module_load_include('inc', 'fedora_repository', 'api/fedora_item');
$item=new Fedora_Item($this->pid);
$rels=$item->get_relationships();
if (count($rels) > 0) {
foreach ($rels as $rel) {
$cp = CollectionPolicy::loadFromCollection($rel['object']);
if ($cp !== FALSE) {
$this->staging_area = $cp->getStagingArea();
break;
}
}
}
}
}
$ret = $this->staging_area;
}
return $ret;
}
/**
* Sets the path to the staging area to use for this
* collection. If specified path is blank (or false) it will
* remove the staging are path element from the collection policy.
*
* @param string $path
*
* @return string $relationship
*/
public function setStagingArea($path) {
$ret=FALSE;
if ($this->validate()) {
$rootEl=$this->xml->getElementsByTagName('collection_policy')->item(0);
$stagingEl=$this->xml->getElementsByTagName('staging_area');
if ($stagingEl->length > 0) {
$stagingEl=$stagingEl->item(0);
if (trim($path) == '') {
$rootEl->removeChild($stagingEl);
}
else {
$stagingEl->nodeValue=trim($path);
}
}
elseif (trim($path) != '') {
$stagingEl=$this->xml->createElement('staging_area', trim($path));
$rootEl->appendChild($stagingEl);
}
$ret = TRUE;
}
return $ret;
}
/**
* Gets the next available PID for the
* content model specified by the DSID
* parameter.
*
* @param string $dsid
* @return string $nextPid
*/
public function getNextPid($dsid) {
$ret = FALSE;
if (self::validDsid($dsid) && $this->validate()) {
$content_models = $this->xml->getElementsByTagName('content_models')->item(0)->getElementsByTagName('content_model');
$namespace = FALSE;
for ($i=0; $namespace === FALSE && $i<$content_models->length;$i++) {
if (strtolower($content_models->item($i)->getAttribute('dsid')) == strtolower($dsid)) {
$namespace = $content_models->item($i)->getAttribute('namespace');
}
}
$pname = substr($namespace, 0, strpos($namespace, ":"));
module_load_include('inc', 'fedora_repository', 'api/fedora_item');
$ret = Fedora_Item::get_next_pid_in_namespace($pname);
}
return $ret;
}
/**
* Gets a list of ContentModel objects supported by this collection.
*
* @return ContentModel[] $models
*/
function getContentModels() {
$ret=FALSE;
if ($this->validate()) {
module_load_include('inc', 'Fedora_Repository', 'ContentModel');
$ret=array();
$content_models = $this->xml->getElementsByTagName('content_models')->item(0)->getElementsByTagName('content_model');
for ($i=0;$i<$content_models->length;$i++) {
$cm=ContentModel::loadFromModel($content_models->item($i)->getAttribute('pid'),
$content_models->item($i)->getAttribute('dsid'),
$content_models->item($i)->getAttribute('namespace'),
$content_models->item($i)->getAttribute('name'));
if ($cm !== FALSE) {
$ret[]=$cm;
}
}
}
return $ret;
}
/**
* Gets a list of search terms from the Collection Policy. If asArray is set
* it will return an associative array with the value, field name, and the default value.
* If not set, an array of just the values will be returned. If $recurse is TRUE, it will
* recurseively return the parents search terms if it has none until it returns a set of terms or reaches
* the top level collection. If $cache is TRUE, it will return a cached version (if available).
*
* @param boolean $asArray
* @param boolean $recurse
* @param boolean $cache
* @return string[] $ret
*/
function getSearchTerms($asArray = FALSE, $recurse = FALSE, $cache = FALSE) {
$ret = FALSE;
if ($cache == TRUE && ($cache = cache_get('collection_policy_search_terms-'.$this->pid)) !== 0 ) {
$ret=$cache->data;
} else {
if ($this->xml == NULL) {
$fedoraItem = new Fedora_Item($this->pid);
$ds = $fedoraItem->get_datastream_dissemination($this->dsid);
$this->xml = DOMDocument::loadXML($ds);
}
if ($this->validate()) {
$ret=array();
$terms= $this->xml->getElementsByTagName('search_terms')->item(0)->getElementsByTagName('term');
for ($i=0;$i<$terms->length;$i++) {
$default = $terms->item($i)->attributes->getNamedItem('default');
$default = ($default !== NULL) ? (strtolower($default->nodeValue) == 'true') : FALSE;
$ret[] = ($asArray)?array( 'value' => $terms->item($i)->nodeValue,
'field' => $terms->item($i)->getAttribute('field'),
'default' => $default): $terms->item($i)->nodeValue;
}
if ($recurse && count($ret) == 0) {
module_load_include('inc', 'fedora_repository', 'api/fedora_item');
$item=new Fedora_Item($this->pid);
$rels=$item->get_relationships();
if (count($rels) > 0) {
foreach ($rels as $rel) {
$cp = CollectionPolicy::loadFromCollection($rel['object']);
if ($cp !== FALSE) {
$ret = $cp->getSearchTerms($asArray, $recurse);
break;
}
}
}
}
cache_set('collection_policy_search_terms-'.$this->pid, $ret, 'cache', time()+3600);
}
}
return $ret;
}
/**
* Adds a search term to the collection policy.
* Returns fase on failure.
*
* @param string $field
* @param string $value
* @return boolean $success
*/
function addTerm($field, $value) {
$ret=FALSE;
if ($this->validate()) {
$search_termsEl = $this->xml->getElementsByTagName('search_terms')->item(0);
$terms= $search_termsEl->getElementsByTagName('term');
$found=FALSE;
for ($i=0;!$found && $i<$terms->length;$i++) {
if ($terms->item($i)->getAttribute('field') == $field) {
$found = TRUE;
}
}
if (!$found) {
$newTermEl = $this->xml->createElement('term', $value);
$newTermEl->setAttribute('field', $field);
$search_termsEl->appendChild($newTermEl);
$ret = TRUE;
}
}
return $ret;
}
/**
* Removes the search term specified by the field parameter from the collection policy.
*
* @param string $field
* @return boolean $success
*/
function removeTerm($field) {
$ret=FALSE;
if ($this->validate()) {
$search_termsEl = $this->xml->getElementsByTagName('search_terms')->item(0);
$terms = $search_termsEl->getElementsByTagName('term');
$found = FALSE;
for ($i=0; !$found && $i < $terms->length; $i++) {
if ($terms->item($i)->getAttribute('field') == $field) {
$found = $terms->item($i);
}
}
if ($found !== FALSE) {
$search_termsEl->removeChild($found);
$ret = TRUE;
}
}
return $ret;
}
function setDefaultTerm($field) {
$ret = FALSE;
if ($this->validate()) {
$search_termsEl = $this->xml->getElementsByTagName('search_terms')->item(0);
$terms= $search_termsEl->getElementsByTagName('term');
$found=FALSE;
for ($i=0;!$found && $i<$terms->length;$i++) {
if ($terms->item($i)->getAttribute('field') == $field) {
$found = $terms->item($i);
}
}
if ($found !== FALSE) {
for ($i=0;$i<$terms->length;$i++)
if ($terms->item($i)->attributes->getNamedItem('default') !== NULL) {
$terms->item($i)->removeAttribute('default');
}
$found->setAttribute('default', 'true');
$ret = TRUE;
}
}
return $ret;
}
/**
* Removes the specified content model from the collection policy. This will only
* prevent future ingests of the removed model to the collection. $cm should be
* a valid ContentModel object. Returns false on failure or when the CM was not found in
* the collection policy.
*
* @param ContentModel $cm
* @return boolean $valid
*/
function removeModel($cm) {
$ret=FALSE;
if ($this->validate() && $cm->validate()) {
$contentmodelsEl = $this->xml->getElementsByTagName('content_models');
$models = $contentmodelsEl->item(0)->getElementsByTagName('content_model');
$found = FALSE;
for ($i=0; $found === FALSE && $i < $models->length; $i++) {
if ($models->item($i)->getAttribute('pid') == $cm->pid) {
$found=$models->item($i);
}
}
if ($found !== FALSE && $models->length > 1) {
$contentmodelsEl->item(0)->removeChild($found);
$ret = TRUE;
}
}
return $ret;
}
function addModel($cm, $namespace) {
$ret = FALSE;
if (self::validPid($namespace) && $this->validate() && $cm->validate()) {
$contentmodelsEl = $this->xml->getElementsByTagName('content_models');
$models = $contentmodelsEl->item(0)->getElementsByTagName('content_model');
$found = FALSE;
for ($i=0;!$found && $i<$models->length;$i++) {
if ($models->item($i)->getAttribute('pid') == $cm->pid)
$found = TRUE;
}
if (!$found) {
$cmEl = $this->xml->createElement('content_model');
$cmEl->setAttribute('name', $cm->getName());
$cmEl->setAttribute('dsid', $cm->dsid);
$cmEl->setAttribute('namespace', $namespace);
$cmEl->setAttribute('pid', $cm->pid);
$contentmodelsEl->item(0)->appendChild($cmEl);
}
$ret = !$found;
}
return $ret;
}
function getName() {
$ret=FALSE;
if ($this->validate()) {
$ret=$this->xml->getElementsByTagName('collection_policy')->item(0)->getAttribute('name');
}
return $ret;
}
}