ODD.php

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<?php
abstract class ODD {
    private $attributes = array();

    private $body;

    public function __construct() {
        $this->body = "";
    }

    public function getAttributes() {
        return $this->attributes;
    }

    public function setAttribute($key, $value) {
        $this->attributes[$key] = $value;
    }

    public function getAttribute($key) {
        if (isset($this->attributes[$key])) {
            return $this->attributes[$key];
        }

        return null;
    }

    public function setBody($value) {
        $this->body = $value;
    }

    public function getBody() {
        return $this->body;
    }

    public function setPublished($time) {
        $this->attributes['published'] = date("r", $time);
    }

    public function getPublishedAsTime() {
        return strtotime($this->attributes['published']);
    }

    abstract protected function getTagName();

    public function __toString() {
        // Construct attributes
        $attr = "";
        foreach ($this->attributes as $k => $v) {
            $attr .= ($v != "") ? "$k=\"$v\" " : "";
        }

        $body = $this->getBody();
        $tag = $this->getTagName();

        $end = "/>";
        if ($body != "") {
            $end = "><![CDATA[$body]]></{$tag}>";
        }

        return "<{$tag} $attr" . $end . "\n";
    }
}