public function EasyRdf_Graph::get

Get a single value for a property of a resource

If multiple values are set for a property then the value returned may be arbitrary.

If $property is an array, then the first item in the array that matches a property that exists is returned.

This method will return null if the property does not exist.

Parameters

string $resource The URI of the resource (e.g. http://example.com/joe#me):

string $propertyPath A valid property path:

string $type The type of value to filter by (e.g. literal or resource):

string $lang The language to filter by (e.g. en):

Return value

mixed A value associated with the property

File

drupal/core/vendor/easyrdf/easyrdf/lib/EasyRdf/Graph.php, line 563

Class

EasyRdf_Graph

Container for collection of EasyRdf_Resources.

Code

public function get($resource, $propertyPath, $type = null, $lang = null) {
  $this
    ->checkResourceParam($resource);
  if (is_object($propertyPath) and $propertyPath instanceof EasyRdf_Resource) {
    return $this
      ->getSingleProperty($resource, $propertyPath
      ->getUri(), $type, $lang);
  }
  elseif (is_string($propertyPath) and preg_match('|^(\\^?)<(.+)>|', $propertyPath, $matches)) {
    return $this
      ->getSingleProperty($resource, "{$matches[1]}{$matches[2]}", $type, $lang);
  }
  elseif ($propertyPath === null or !is_string($propertyPath)) {
    throw new InvalidArgumentException("\$propertyPath should be a string or EasyRdf_Resource and cannot be null");
  }
  elseif ($propertyPath === '') {
    throw new InvalidArgumentException("\$propertyPath cannot be an empty string");
  }

  // Loop through each component in the path
  foreach (explode('/', $propertyPath) as $part) {

    // Stop if we come to a literal
    if ($resource instanceof EasyRdf_Literal) {
      return null;
    }

    // Try each of the alternative paths
    foreach (explode('|', $part) as $p) {
      $res = $this
        ->getSingleProperty($resource, $p, $type, $lang);
      if ($res) {
        break;
      }
    }

    // Stop if nothing was found
    $resource = $res;
    if (!$resource) {
      break;
    }
  }
  return $resource;
}