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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
*/
/**
* Parent class for the EasyRdf serialiser
*
* @package EasyRdf
* @copyright Copyright (c) 2009-2013 Nicholas J Humfrey
* @license http://www.opensource.org/licenses/bsd-license.php
*/
class EasyRdf_Serialiser
{
protected $prefixes = array();
public function __construct()
{
}
/**
* Keep track of the prefixes used while serialising
* @ignore
*/
protected function addPrefix($qname)
{
list ($prefix) = explode(':', $qname);
$this->prefixes[$prefix] = true;
}
/**
* Check and cleanup parameters passed to serialise() method
* @ignore
*/
protected function checkSerialiseParams(&$graph, &$format)
{
if (is_null($graph) or !is_object($graph) or !($graph instanceof EasyRdf_Graph)) {
throw new InvalidArgumentException(
"\$graph should be an EasyRdf_Graph object and cannot be null"
);
}
if (is_null($format) or $format == '') {
throw new InvalidArgumentException(
"\$format cannot be null or empty"
);
} elseif (is_object($format) and ($format instanceof EasyRdf_Format)) {
$format = $format->getName();
} elseif (!is_string($format)) {
throw new InvalidArgumentException(
"\$format should be a string or an EasyRdf_Format object"
);
}
}
/**
* Protected method to get the number of reverse properties for a resource
* If a resource only has a single property, the number of values for that
* property is returned instead.
* @ignore
*/
protected function reversePropertyCount($resource)
{
$properties = $resource->reversePropertyUris();
$count = count($properties);
if ($count == 1) {
$property = $properties[0];
return $resource->countValues("^<$property>");
} else {
return $count;
}
}
/**
* Sub-classes must follow this protocol
* @ignore
*/
public function serialise($graph, $format, array $options = array())
{
throw new EasyRdf_Exception(
"This method should be overridden by sub-classes."
);
}
}