--- /dev/null
+<?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;
+ }
+}
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