class EasyRdf_Container in Zircon Profile 8

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

Hierarchy

• class \EasyRdf_Resource
  • class \EasyRdf_Container implements \ArrayAccess, \Countable, \SeekableIterator

1 string reference to 'EasyRdf_Container'

TypeMapper.php in vendor/easyrdf/easyrdf/lib/EasyRdf/TypeMapper.php

File

vendor/easyrdf/easyrdf/lib/EasyRdf/Container.php, line 49

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");
    }
  }

}

Members

Name	Modifiers	Type	Description	Overrides
EasyRdf_Container::$position	private	property
EasyRdf_Container::append	public	function	Append an item to the end of the container
EasyRdf_Container::count	public	function	Counts the number of items in the container
EasyRdf_Container::current	public	function	Return the current item in the container
EasyRdf_Container::key	public	function	Return the key / current position in the container
EasyRdf_Container::next	public	function	Move forward to next item in the container
EasyRdf_Container::offsetExists	public	function	Array Access: check if a position exists in container using array syntax
EasyRdf_Container::offsetGet	public	function	Array Access: get an item at a specified position in container using array syntax
EasyRdf_Container::offsetSet	public	function	Array Access: set an item at a positon in container using array syntax
EasyRdf_Container::offsetUnset	public	function	Array Access: delete an item at a specific postion using array syntax
EasyRdf_Container::rewind	public	function	Rewind the iterator back to the start of the container (item 1)
EasyRdf_Container::seek	public	function	Seek to a specific position in the container
EasyRdf_Container::valid	public	function	Checks if current position is valid
EasyRdf_Container::__construct	public	function	Create a new container - do not use this directly Overrides EasyRdf_Resource::__construct
EasyRdf_Resource::$graph	protected	property	The Graph that this resource belongs to
EasyRdf_Resource::$uri	protected	property	The URI for this resource
EasyRdf_Resource::add	public	function	Add values to for a property of the resource
EasyRdf_Resource::addLiteral	public	function	Add a literal value as a property of the resource
EasyRdf_Resource::addResource	public	function	Add a resource as a property of the resource
EasyRdf_Resource::addType	public	function	Add one or more rdf:type properties to the resource
EasyRdf_Resource::all	public	function	Get all values for a property
EasyRdf_Resource::allLiterals	public	function	Get all literal values for a property of the resource
EasyRdf_Resource::allResources	public	function	Get all resources for a property of the resource
EasyRdf_Resource::checkHasGraph	protected	function	Throw can exception if the resource does not belong to a graph @ignore
EasyRdf_Resource::countValues	public	function	Count the number of values for a property of a resource
EasyRdf_Resource::delete	public	function	Delete a property (or optionally just a specific value)
EasyRdf_Resource::dump	public	function	Return a human readable view of the resource and its properties
EasyRdf_Resource::dumpValue	public	function	Return pretty-print view of the resource
EasyRdf_Resource::get	public	function	Get a single value for a property
EasyRdf_Resource::getBNodeId	public	function	Get the identifier for a blank node
EasyRdf_Resource::getGraph	public	function	Return the graph that this resource belongs to
EasyRdf_Resource::getLiteral	public	function	Get a single literal value for a property of the resource
EasyRdf_Resource::getResource	public	function	Get a single resource value for a property of the resource
EasyRdf_Resource::getUri	public	function	Returns the URI for the resource.
EasyRdf_Resource::hasProperty	public	function	Check to see if a property exists for this resource.
EasyRdf_Resource::htmlLink	public	function	Generates an HTML anchor tag, linking to this resource.
EasyRdf_Resource::isA	public	function	Check if a resource is of the specified type
EasyRdf_Resource::isBNode	public	function	Check to see if a resource is a blank node.
EasyRdf_Resource::join	public	function	Concatenate all values for a property into a string.
EasyRdf_Resource::label	public	function	Get a human readable label for this resource
EasyRdf_Resource::load	public	function	Perform a load (download of remote URI) of the resource into the graph
EasyRdf_Resource::localName	public	function	Gets the local name of the URI of this resource
EasyRdf_Resource::parseUri	public	function	Parse the URI of the resource and return as a ParsedUri object
EasyRdf_Resource::prefix	public	function	Get a the prefix of the namespace that this resource is part of
EasyRdf_Resource::primaryTopic	public	function	Get the primary topic of this resource.
EasyRdf_Resource::properties	public	function	Get a list of all the shortened property names (qnames) for a resource.
EasyRdf_Resource::propertyUris	public	function	Get a list of the full URIs for the properties of this resource.
EasyRdf_Resource::reversePropertyUris	public	function	Get a list of the full URIs for the properties that point to this resource.
EasyRdf_Resource::set	public	function	Set value for a property
EasyRdf_Resource::setType	public	function	Change the rdf:type property for the resource
EasyRdf_Resource::shorten	public	function	Get a shortened version of the resources URI.
EasyRdf_Resource::toRdfPhp	public	function	Returns the properties of the resource as an RDF/PHP associative array
EasyRdf_Resource::type	public	function	Get a single type for a resource.
EasyRdf_Resource::typeAsResource	public	function	Get a single type for a resource, as a resource.
EasyRdf_Resource::types	public	function	Get a list of types for a resource.
EasyRdf_Resource::typesAsResources	public	function	Get a list of types for a resource, as Resources.
EasyRdf_Resource::__get	public	function	Magic method to get a property of a resource
EasyRdf_Resource::__isset	public	function	Magic method to check if a property exists
EasyRdf_Resource::__set	public	function	Magic method to set the value for a property of a resource
EasyRdf_Resource::__toString	public	function	Magic method to return URI of resource when casted to string
EasyRdf_Resource::__unset	public	function	Magic method to delete a property of the resource