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<?php
/**
* EasyRdf
*
* LICENSE
*
* Copyright (c) 2009-2013 Nicholas J Humfrey. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. The name of the author 'Nicholas J Humfrey" may be used to endorse or
* promote products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* @package EasyRdf
* @copyright Copyright (c) 2009-2013 Nicholas J Humfrey
* @license http://www.opensource.org/licenses/bsd-license.php
*/
/**
* A class for fetching, saving and deleting graphs to a Graph Store.
* Implementation of the SPARQL 1.1 Graph Store HTTP Protocol.
*
* @package EasyRdf
* @copyright Copyright (c) 2009-2013 Nicholas J Humfrey
* @license http://www.opensource.org/licenses/bsd-license.php
*/
class EasyRdf_GraphStore
{
/**
* Use to reference default graph of triplestore
*/
const DEFAULT_GRAPH = 'urn:easyrdf:default-graph';
/** The address of the GraphStore endpoint */
private $uri = null;
private $parsedUri = null;
/** Create a new SPARQL Graph Store client
*
* @param string $uri The address of the graph store endpoint
*/
public function __construct($uri)
{
$this->uri = $uri;
$this->parsedUri = new EasyRdf_ParsedUri($uri);
}
/** Get the URI of the graph store
*
* @return string The URI of the graph store
*/
public function getUri()
{
return $this->uri;
}
/** Fetch a named graph from the graph store
*
* The URI can either be a full absolute URI or
* a URI relative to the URI of the graph store.
*
* @param string $uriRef The URI of graph desired
* @return EasyRdf_Graph The graph requested
*/
public function get($uriRef)
{
if ($uriRef === self::DEFAULT_GRAPH) {
$dataUrl = $this->urlForGraph(self::DEFAULT_GRAPH);
$graph = new EasyRdf_Graph();
} else {
$graphUri = $this->parsedUri->resolve($uriRef)->toString();
$dataUrl = $this->urlForGraph($graphUri);
$graph = new EasyRdf_Graph($graphUri);
}
$graph->load($dataUrl);
return $graph;
}
/**
* Fetch default graph from the graph store
* @return EasyRdf_Graph
*/
public function getDefault()
{
return $this->get(self::DEFAULT_GRAPH);
}
/** Send some graph data to the graph store
*
* This method is used by insert() and replace()
*
* @ignore
*/
protected function sendGraph($method, $graph, $uriRef, $format)
{
if (is_object($graph) and $graph instanceof EasyRdf_Graph) {
if ($uriRef === null) {
$uriRef = $graph->getUri();
}
$data = $graph->serialise($format);
} else {
$data = $graph;
}
if ($uriRef === null) {
throw new InvalidArgumentException('Graph IRI is not specified');
}
$formatObj = EasyRdf_Format::getFormat($format);
$mimeType = $formatObj->getDefaultMimeType();
if ($uriRef === self::DEFAULT_GRAPH) {
$dataUrl = $this->urlForGraph(self::DEFAULT_GRAPH);
} else {
$graphUri = $this->parsedUri->resolve($uriRef)->toString();
$dataUrl = $this->urlForGraph($graphUri);
}
$client = EasyRdf_Http::getDefaultHttpClient();
$client->resetParameters(true);
$client->setUri($dataUrl);
$client->setMethod($method);
$client->setRawData($data);
$client->setHeaders('Content-Type', $mimeType);
$response = $client->request();
if (!$response->isSuccessful()) {
throw new EasyRdf_Exception(
"HTTP request for {$dataUrl} failed: ".$response->getMessage()
);
}
return $response;
}
/** Replace the contents of a graph in the graph store with new data
*
* The $graph parameter is the EasyRdf_Graph object to be sent to the
* graph store. Alternatively it can be a string, already serialised.
*
* The URI can either be a full absolute URI or
* a URI relative to the URI of the graph store.
*
* The $format parameter can be given to specify the serialisation
* used to send the graph data to the graph store.
*
* @param EasyRdf_Graph|string $graph Data
* @param string $uriRef The URI of graph to be replaced
* @param string $format The format of the data to send to the graph store
* @return EasyRdf_Http_Response The response from the graph store
*/
public function replace($graph, $uriRef = null, $format = 'ntriples')
{
return $this->sendGraph('PUT', $graph, $uriRef, $format);
}
/**
* Replace the contents of default graph in the graph store with new data
*
* The $graph parameter is the EasyRdf_Graph object to be sent to the
* graph store. Alternatively it can be a string, already serialised.
*
* The $format parameter can be given to specify the serialisation
* used to send the graph data to the graph store.
*
* @param EasyRdf_Graph|string $graph Data
* @param string $format The format of the data to send to the graph store
* @return EasyRdf_Http_Response The response from the graph store
*/
public function replaceDefault($graph, $format = 'ntriples')
{
return self::replace($graph, self::DEFAULT_GRAPH, $format);
}
/** Add data to a graph in the graph store
*
* The $graph parameter is the EasyRdf_Graph object to be sent to the
* graph store. Alternatively it can be a string, already serialised.
*
* The URI can either be a full absolute URI or
* a URI relative to the URI of the graph store.
*
* The $format parameter can be given to specify the serialisation
* used to send the graph data to the graph store.
*
* @param EasyRdf_Graph|string $graph Data
* @param string $uriRef The URI of graph to be added to
* @param string $format The format of the data to send to the graph store
* @return object EasyRdf_Http_Response The response from the graph store
*/
public function insert($graph, $uriRef = null, $format = 'ntriples')
{
return $this->sendGraph('POST', $graph, $uriRef, $format);
}
/**
* Add data to default graph of the graph store
*
* The $graph parameter is the EasyRdf_Graph object to be sent to the
* graph store. Alternatively it can be a string, already serialised.
*
* The $format parameter can be given to specify the serialisation
* used to send the graph data to the graph store.
*
* @param EasyRdf_Graph|string $graph Data
* @param string $format The format of the data to send to the graph store
* @return object EasyRdf_Http_Response The response from the graph store
*/
public function insertIntoDefault($graph, $format = 'ntriples')
{
return $this->insert($graph, self::DEFAULT_GRAPH, $format);
}
/** Delete named graph content from the graph store
*
* The URI can either be a full absolute URI or
* a URI relative to the URI of the graph store.
*
* @param string $uriRef The URI of graph to be added to
*
* @throws EasyRdf_Exception
* @return EasyRdf_Http_Response The response from the graph store
*/
public function delete($uriRef)
{
if ($uriRef === self::DEFAULT_GRAPH) {
$dataUrl = $this->urlForGraph(self::DEFAULT_GRAPH);
} else {
$graphUri = $this->parsedUri->resolve($uriRef)->toString();
$dataUrl = $this->urlForGraph($graphUri);
}
$client = EasyRdf_Http::getDefaultHttpClient();
$client->resetParameters(true);
$client->setUri($dataUrl);
$client->setMethod('DELETE');
$response = $client->request();
if (!$response->isSuccessful()) {
throw new EasyRdf_Exception(
"HTTP request to delete {$dataUrl} failed: ".$response->getMessage()
);
}
return $response;
}
/**
* Delete default graph content from the graph store
*
* @return EasyRdf_Http_Response
* @throws EasyRdf_Exception
*/
public function deleteDefault()
{
return $this->delete(self::DEFAULT_GRAPH);
}
/** Work out the full URL for a graph store request.
* by checking if if it is a direct or indirect request.
* @ignore
*/
protected function urlForGraph($url)
{
if ($url === self::DEFAULT_GRAPH) {
$url = $this->uri.'?default';
} elseif (strpos($url, $this->uri) === false) {
$url = $this->uri."?graph=".urlencode($url);
}
return $url;
}
/** Magic method to return URI of the graph store when casted to string
*
* @return string The URI of the graph store
*/
public function __toString()
{
return empty($this->uri) ? '' : $this->uri;
}
}