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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
*/
/**
* Class to parse RDF using the 'rapper' command line tool.
*
* @package EasyRdf
* @copyright Copyright (c) 2009-2013 Nicholas J Humfrey
* @license http://www.opensource.org/licenses/bsd-license.php
*/
class EasyRdf_Parser_Rapper extends EasyRdf_Parser_Json
{
private $rapperCmd = null;
const MINIMUM_RAPPER_VERSION = '1.4.17';
/**
* Constructor
*
* @param string $rapperCmd Optional path to the rapper command to use.
* @return object EasyRdf_Parser_Rapper
*/
public function __construct($rapperCmd = 'rapper')
{
$result = exec("$rapperCmd --version 2>/dev/null", $output, $status);
if ($status != 0) {
throw new EasyRdf_Exception(
"Failed to execute the command '$rapperCmd': $result"
);
} elseif (version_compare($result, self::MINIMUM_RAPPER_VERSION) < 0) {
throw new EasyRdf_Exception(
"Version ".self::MINIMUM_RAPPER_VERSION." or higher of rapper is required."
);
} else {
$this->rapperCmd = $rapperCmd;
}
}
/**
* Parse an RDF document into an EasyRdf_Graph
*
* @param object EasyRdf_Graph $graph the graph to load the data into
* @param string $data the RDF document data
* @param string $format the format of the input data
* @param string $baseUri the base URI of the data being parsed
* @return integer The number of triples added to the graph
*/
public function parse($graph, $data, $format, $baseUri)
{
parent::checkParseParams($graph, $data, $format, $baseUri);
$json = EasyRdf_Utils::execCommandPipe(
$this->rapperCmd,
array(
'--quiet',
'--input', $format,
'--output', 'json',
'--ignore-errors',
'--input-uri', $baseUri,
'--output-uri', '-', '-'
),
$data
);
// Parse in the JSON
return parent::parse($graph, $json, 'json', $baseUri);
}
}