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<?php
/**
* EasyRdf
*
* LICENSE
*
* Copyright (c) 2009-2012 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) 2009-2012 Nicholas J Humfrey
* @license http://www.opensource.org/licenses/bsd-license.php
* @version $Id$
*/
/**
* Class for making SPARQL queries using the SPARQL 1.1 Protocol
*
* @package EasyRdf
* @copyright Copyright (c) 2009-2012 Nicholas J Humfrey
* @license http://www.opensource.org/licenses/bsd-license.php
*/
class EasyRdf_Sparql_Client
{
/** The address of the SPARQL Endpoint */
private $uri = null;
/** Configuration settings */
private $config = array();
/** Create a new SPARQL endpoint client
*
* @param string $uri The address of the SPARQL Endpoint
*/
public function __construct($uri)
{
$this->uri = $uri;
}
/** Get the URI of the SPARQL endpoint
*
* @return string The URI of the SPARQL endpoint
*/
public function getUri()
{
return $this->uri;
}
/** Make a query to the SPARQL endpoint
*
* SELECT and ASK queries will return an object of type
* EasyRdf_Sparql_Result.
*
* CONSTRUCT and DESCRIBE queries will return an object
* of type EasyRdf_Graph.
*
* @param string $query The query string to be executed
* @return object EasyRdf_Sparql_Result|EasyRdf_Graph Result of the query.
*/
public function query($query)
{
# Add namespaces to the queryString
$prefixes = '';
foreach (EasyRdf_Namespace::namespaces() as $prefix => $uri) {
if (strpos($query, "$prefix:") !== false and
strpos($query, "PREFIX $prefix:") === false) {
$prefixes .= "PREFIX $prefix: <$uri>\n";
}
}
$client = EasyRdf_Http::getDefaultHttpClient();
$client->resetParameters();
$client->setUri($this->uri);
$client->setMethod('GET');
$accept = EasyRdf_Format::getHttpAcceptHeader(
array(
'application/sparql-results+json' => 1.0,
'application/sparql-results+xml' => 0.8
)
);
$client->setHeaders('Accept', $accept);
$client->setParameterGet('query', $prefixes . $query);
$response = $client->request();
if ($response->isSuccessful()) {
list($type, $params) = EasyRdf_Utils::parseMimeType(
$response->getHeader('Content-Type')
);
if (strpos($type, 'application/sparql-results') === 0) {
return new EasyRdf_Sparql_Result($response->getBody(), $type);
} else {
return new EasyRdf_Graph($this->uri, $response->getBody(), $type);
}
} else {
throw new EasyRdf_Exception(
"HTTP request for SPARQL query failed: ".$response->getBody()
);
}
}
/** Magic method to return URI of the SPARQL endpoint when casted to string
*
* @return string The URI of the SPARQL endpoint
*/
public function __toString()
{
return $this->uri == null ? '' : $this->uri;
}
}