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Rapper.php
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Rapper.php
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<?php
namespace EasyRdf\Serialiser;
/**
* 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
*/
use EasyRdf\Exception;
use EasyRdf\Graph;
use EasyRdf\Utils;
/**
* Class to serialise an EasyRdf\Graph to RDF
* using the 'rapper' command line tool.
*
* Note: the built-in N-Triples serialiser is used to pass data to Rapper.
*
* @package EasyRdf
* @copyright Copyright (c) 2009-2013 Nicholas J Humfrey
* @license http://www.opensource.org/licenses/bsd-license.php
*/
class Rapper extends Ntriples
{
private $rapperCmd = null;
/**
* Constructor
*
* @param string $rapperCmd Optional path to the rapper command to use.
*
* @throws \EasyRdf\Exception
*/
public function __construct($rapperCmd = 'rapper')
{
$result = exec("$rapperCmd --version 2>/dev/null", $output, $status);
if ($status != 0) {
throw new Exception(
"Failed to execute the command '$rapperCmd': $result"
);
} else {
$this->rapperCmd = $rapperCmd;
}
}
/**
* Serialise an EasyRdf\Graph to the RDF format of choice.
*
* @param \EasyRdf\Graph $graph An EasyRdf\Graph object.
* @param string $format The name of the format to convert to.
* @param array $options
*
* @return string The RDF in the new desired format.
* @throws Exception
*/
public function serialise(Graph $graph, $format, array $options = array())
{
parent::checkSerialiseParams($format);
$ntriples = parent::serialise($graph, 'ntriples');
// Hack to produce more concise RDF/XML
if ($format == 'rdfxml') {
$format = 'rdfxml-abbrev';
}
return Utils::execCommandPipe(
$this->rapperCmd,
array(
'--quiet',
'--input', 'ntriples',
'--output', $format,
'-', 'unknown://'
),
$ntriples
);
}
}