--- /dev/null
+<?php
+
+/**
+ * EasyRdf
+ *
+ * LICENSE
+ *
+ * Copyright (c) 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) 2013 Nicholas J Humfrey
+ * @license http://www.opensource.org/licenses/bsd-license.php
+ */
+
+/**
+ * Sub-class of EasyRdf_Resource that represents an RDF container
+ * (rdf:Alt, rdf:Bag and rdf:Seq)
+ *
+ * This class can be used to iterate through a list of items.
+ *
+ * @package EasyRdf
+ * @link http://www.w3.org/TR/xmlschema-2/#date
+ * @copyright Copyright (c) 2013 Nicholas J Humfrey
+ * @license http://www.opensource.org/licenses/bsd-license.php
+ */
+class EasyRdf_Container extends EasyRdf_Resource implements ArrayAccess, Countable, SeekableIterator
+{
+ private $position;
+
+ /** Create a new container - do not use this directly
+ *
+ * @ignore
+ */
+ public function __construct($uri, $graph)
+ {
+ $this->position = 1;
+ parent::__construct($uri, $graph);
+ }
+
+ /** Seek to a specific position in the container
+ *
+ * The first item is postion 1
+ *
+ * @param integer $position The position in the container to seek to
+ * @throws OutOfBoundsException
+ */
+ public function seek($position)
+ {
+ if (is_int($position) and $position > 0) {
+ if ($this->hasProperty('rdf:_'.$position)) {
+ $this->position = $position;
+ } else {
+ throw new OutOfBoundsException(
+ "Unable to seek to position $position in the container"
+ );
+ }
+ } else {
+ throw new InvalidArgumentException(
+ "Container position must be a positive integer"
+ );
+ }
+ }
+
+ /** Rewind the iterator back to the start of the container (item 1)
+ *
+ */
+ public function rewind()
+ {
+ $this->position = 1;
+ }
+
+ /** Return the current item in the container
+ *
+ * @return mixed The current item
+ */
+ public function current()
+ {
+ return $this->get('rdf:_'.$this->position);
+ }
+
+ /** Return the key / current position in the container
+ *
+ * @return int The current position
+ */
+ public function key()
+ {
+ return $this->position;
+ }
+
+ /** Move forward to next item in the container
+ *
+ */
+ public function next()
+ {
+ $this->position++;
+ }
+
+ /** Checks if current position is valid
+ *
+ * @return bool True if the current position is valid
+ */
+ public function valid()
+ {
+ return $this->hasProperty('rdf:_'.$this->position);
+ }
+
+ /** Counts the number of items in the container
+ *
+ * Note that this is an slow method - it is more efficient to use
+ * the iterator interface, if you can.
+ *
+ * @return integer The number of items in the container
+ */
+ public function count()
+ {
+ $pos = 1;
+ while ($this->hasProperty('rdf:_'.$pos)) {
+ $pos++;
+ }
+ return $pos - 1;
+ }
+
+ /** Append an item to the end of the container
+ *
+ * @param mixed $value The value to append
+ * @return integer The number of values appended (1 or 0)
+ */
+ public function append($value)
+ {
+ // Find the end of the list
+ $pos = 1;
+ while ($this->hasProperty('rdf:_'.$pos)) {
+ $pos++;
+ }
+
+ // Add the item
+ return $this->add('rdf:_'.$pos, $value);
+ }
+
+ /** Array Access: check if a position exists in container using array syntax
+ *
+ * Example: isset($seq[2])
+ */
+ public function offsetExists($offset)
+ {
+ if (is_int($offset) and $offset > 0) {
+ return $this->hasProperty('rdf:_'.$offset);
+ } else {
+ throw new InvalidArgumentException(
+ "Container position must be a positive integer"
+ );
+ }
+ }
+
+ /** Array Access: get an item at a specified position in container using array syntax
+ *
+ * Example: $item = $seq[2];
+ */
+ public function offsetGet($offset)
+ {
+ if (is_int($offset) and $offset > 0) {
+ return $this->get('rdf:_'.$offset);
+ } else {
+ throw new InvalidArgumentException(
+ "Container position must be a positive integer"
+ );
+ }
+ }
+
+ /**
+ * Array Access: set an item at a positon in container using array syntax
+ *
+ * Example: $seq[2] = $item;
+ *
+ * Warning: creating gaps in the sequence will result in unexpected behavior
+ */
+ public function offsetSet($offset, $value)
+ {
+ if (is_int($offset) and $offset > 0) {
+ return $this->set('rdf:_'.$offset, $value);
+ } elseif (is_null($offset)) {
+ return $this->append($value);
+ } else {
+ throw new InvalidArgumentException(
+ "Container position must be a positive integer"
+ );
+ }
+ }
+
+ /**
+ * Array Access: delete an item at a specific postion using array syntax
+ *
+ * Example: unset($seq[2]);
+ *
+ * Warning: creating gaps in the sequence will result in unexpected behavior
+ */
+ public function offsetUnset($offset)
+ {
+ if (is_int($offset) and $offset > 0) {
+ return $this->delete('rdf:_'.$offset);
+ } else {
+ throw new InvalidArgumentException(
+ "Container position must be a positive integer"
+ );
+ }
+ }
+}
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