ODDDocument.php

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<?php
class ODDDocument implements Iterator {
    private $ODDSupportedVersion = "1.0";

    private $elements;

    private $wrapperfactory;

    public function __construct(array $elements = null) {
        if ($elements) {
            if (is_array($elements)) {
                $this->elements = $elements;
            } else {
                $this->addElement($elements);
            }
        } else {
            $this->elements = array();
        }
    }

    public function getVersion() {
        return $this->ODDSupportedVersion;
    }

    public function getNumElements() {
        return count($this->elements);
    }

    public function addElement(ODD $element) {
        if (!is_array($this->elements)) {
            $this->elements = array();
        }
        $this->elements[] = $element;
    }

    public function addElements(array $elements) {
        foreach ($elements as $element) {
            $this->addElement($element);
        }
    }

    public function getElements() {
        return $this->elements;
    }

    public function setWrapperFactory(ODDWrapperFactory $factory) {
        $this->wrapperfactory = $factory;
    }

    public function __toString() {
        $xml = "";

        if ($this->wrapperfactory) {
            // A wrapper has been provided
            $wrapper = $this->wrapperfactory->getElementWrapper($this); // Get the wrapper for this element

            $xml = $wrapper->wrap($this); // Wrap this element (and subelements)
        } else {
            // Output begin tag
            $generated = date("r");
            $xml .= "<odd version=\"{$this->ODDSupportedVersion}\" generated=\"$generated\">\n";

            // Get XML for elements
            foreach ($this->elements as $element) {
                $xml .= "$element";
            }

            // Output end tag
            $xml .= "</odd>\n";
        }

        return $xml;
    }

    // ITERATOR INTERFACE //////////////////////////////////////////////////////////////
    /*
     * This lets an entity's attributes be displayed using foreach as a normal array.
     * Example: http://www.sitepoint.com/print/php5-standard-library
     */

    private $valid = false;

    function rewind() {
        $this->valid = (false !== reset($this->elements));
    }

    function current() {
        return current($this->elements);
    }

    function key() {
        return key($this->elements);
    }

    function next() {
        $this->valid = (false !== next($this->elements));
    }

    function valid() {
        return $this->valid;
    }
}