public function views_oai_pmh_xml_node::draw in Views OAI-PMH 7.2

Same name and namespace in other branches

1. 6.2 plugins/includes/views_oai_pmh_xml_node.inc \views_oai_pmh_xml_node::draw()

Creates the XML for this node. If the object's $value property is an array, this method recursively calls the draw() method on each of the views_oai_pmh_xml_node objects in the $value array and returns the combined XML output.

Parameters

int $indent_level: The amount by which to indent this XML node in the output string. Recursive calls to draw() on child views_oai_pmh_xml_node objects increase the indent level by 1 each time.

Return value

string A string containing the generated XML code ready for output.

File

plugins/includes/views_oai_pmh_xml_node.inc, line 175

Definition of the views_oai_pmh_xml_node class.

Class

views_oai_pmh_xml_node

A class designed to represent an XML node, specially designed to help the Views OAI PMH module render OAI fields as XML elements.

Code

public function draw($indent_level = 0) {

  // Create an indent string appropriate to the current indent level.
  $indent = str_repeat('  ', $indent_level);

  // Build up a string containing this node's attributes.
  $attrs = array();
  if (is_array($this->attributes)) {
    foreach ($this->attributes as $key => $value) {
      $attrs[] = $key . '="' . $value . '"';
    }
  }
  $attrs = implode(' ', $attrs);
  if ($attrs) {
    $attrs = ' ' . $attrs;
  }

  // Construct the buffer string containing this node and all its descendants.
  $buffer = '';

  // Case 1: $this->value contains an array.
  if (is_array($this->value)) {

    // Increase the indent level for drawing our child objects.
    $indent_level++;

    // Find out the type of key used to index the $this->value array
    reset($this->value);
    $first_key = key($this->value);

    // Case 1A: The contained array holds named XML objects. Draw this object, then draw its children.
    if (!is_numeric($first_key)) {
      $tag = $this
        ->process_tag_name($this->key);
      $buffer .= $indent . '<' . $tag . $attrs . '>' . "\n";
      foreach ($this->value as $child) {
        $buffer .= $child
          ->draw($indent_level);
      }
      $buffer .= $indent . '</' . $tag . '>' . "\n";
    }
    else {
      foreach ($this->value as $child) {
        $buffer .= $child
          ->draw($indent_level);
      }
    }
  }
  elseif (is_a($this->value, 'views_oai_pmh_xml_node')) {
    $tag = $this
      ->process_tag_name($this->key);
    $buffer .= $indent . '<' . $tag . $attrs . '>' . "\n";
    $buffer .= $this->value
      ->draw($indent_level);
    $buffer .= $indent . '</' . $tag . '>' . "\n";
  }
  elseif ($this->value != '') {
    $tag = $this
      ->process_tag_name($this->key);
    $buffer .= $indent . '<' . $tag . $attrs . '>' . $this->value . '</' . $tag . '>' . "\n";
  }
  else {
    $tag = $this
      ->process_tag_name($this->key);
    $buffer .= $indent . '<' . $tag . $attrs . ' />' . "\n";
  }
  return $buffer;
}