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<?php
namespace EasyRdf;
/**
* EasyRdf
*
* LICENSE
*
* Copyright (c) 2009-2015 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) 2009-2015 Nicholas J Humfrey
* @license https://www.opensource.org/licenses/bsd-license.php
*/
/**
* Parent class for the EasyRdf parsers
*
* @package EasyRdf
* @copyright Copyright (c) 2009-2015 Nicholas J Humfrey
* @license https://www.opensource.org/licenses/bsd-license.php
*/
class Parser
{
/** Mapping from source to graph bnode identifiers */
private $bnodeMap = array();
/** The current graph to insert triples into */
/** @var Graph */
protected $graph = null;
/** The format of the document currently being parsed */
protected $format = null;
/** The base URI for the document currently being parsed */
protected $baseUri = null;
protected $tripleCount = 0;
/**
* Create a new, unique bnode identifier from a source identifier.
* If the source identifier has previously been seen, the
* same new bnode identifier is returned.
* @ignore
*/
protected function remapBnode($name)
{
if (!isset($this->bnodeMap[$name])) {
$this->bnodeMap[$name] = $this->graph->newBNodeId();
}
return $this->bnodeMap[$name];
}
/**
* Delete the bnode mapping - to be called at the start of a new parse
* @ignore
*/
protected function resetBnodeMap()
{
$this->bnodeMap = array();
}
/**
* Check, cleanup parameters and prepare for parsing
* @ignore
*/
protected function checkParseParams($graph, $data, $format, $baseUri)
{
if ($graph == null or !is_object($graph) or
!($graph instanceof Graph)) {
throw new \InvalidArgumentException(
'$graph should be an EasyRdf\Graph object and cannot be null'
);
} else {
$this->graph = $graph;
}
if ($format == null or $format == '') {
throw new \InvalidArgumentException(
"\$format cannot be null or empty"
);
} elseif (is_object($format) and $format instanceof Format) {
$this->format = $format = $format->getName();
} elseif (!is_string($format)) {
throw new \InvalidArgumentException(
'$format should be a string or an EasyRdf\Format object'
);
} else {
$this->format = $format;
}
if ($baseUri) {
if (!is_string($baseUri)) {
throw new \InvalidArgumentException(
"\$baseUri should be a string"
);
} else {
$this->baseUri = new ParsedUri($baseUri);
}
} else {
$this->baseUri = null;
}
// Prepare for parsing
$this->resetBnodeMap();
$this->tripleCount = 0;
}
/**
* Sub-classes must follow this protocol
* @ignore
*/
public function parse($graph, $data, $format, $baseUri)
{
throw new Exception(
"This method should be overridden by sub-classes."
);
}
/**
* Add a triple to the current graph, and keep count of the number of triples
* @ignore
*/
protected function addTriple($resource, $property, $value)
{
$count = $this->graph->add($resource, $property, $value);
$this->tripleCount += $count;
return $count;
}
}
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