8 * Copyright (c) 2009-2013 Nicholas J Humfrey. All rights reserved.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright notice,
15 * this list of conditions and the following disclaimer in the documentation
16 * and/or other materials provided with the distribution.
17 * 3. The name of the author 'Nicholas J Humfrey" may be used to endorse or
18 * promote products derived from this software without specific prior
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
22 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
25 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
30 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
31 * POSSIBILITY OF SUCH DAMAGE.
34 * @copyright Copyright (c) 2009-2013 Nicholas J Humfrey
35 * @license http://www.opensource.org/licenses/bsd-license.php
39 * Parent class for the EasyRdf serialiser
42 * @copyright Copyright (c) 2009-2013 Nicholas J Humfrey
43 * @license http://www.opensource.org/licenses/bsd-license.php
45 class EasyRdf_Serialiser
47 protected $prefixes = array();
49 public function __construct()
54 * Keep track of the prefixes used while serialising
57 protected function addPrefix($qname)
59 list ($prefix) = explode(':', $qname);
60 $this->prefixes[$prefix] = true;
64 * Check and cleanup parameters passed to serialise() method
67 protected function checkSerialiseParams(&$graph, &$format)
69 if (is_null($graph) or !is_object($graph) or !($graph instanceof EasyRdf_Graph)) {
70 throw new InvalidArgumentException(
71 "\$graph should be an EasyRdf_Graph object and cannot be null"
75 if (is_null($format) or $format == '') {
76 throw new InvalidArgumentException(
77 "\$format cannot be null or empty"
79 } elseif (is_object($format) and ($format instanceof EasyRdf_Format)) {
80 $format = $format->getName();
81 } elseif (!is_string($format)) {
82 throw new InvalidArgumentException(
83 "\$format should be a string or an EasyRdf_Format object"
89 * Protected method to get the number of reverse properties for a resource
90 * If a resource only has a single property, the number of values for that
91 * property is returned instead.
94 protected function reversePropertyCount($resource)
96 $properties = $resource->reversePropertyUris();
97 $count = count($properties);
99 $property = $properties[0];
100 return $resource->countValues("^<$property>");
107 * Sub-classes must follow this protocol
110 public function serialise($graph, $format, array $options = array())
112 throw new EasyRdf_Exception(
113 "This method should be overridden by sub-classes."