<?php
/**
 * $Horde: framework/XML_WBXML/WBXML/ContentHandler.php,v 1.15 2006/01/01 21:10:25 jan Exp $
 *
 * Copyright 2003-2006 Anthony Mills <amills@pyramid6.com>
 *
 * See the enclosed file COPYING for license information (LGPL).  If you did
 * not receive this file, see http://www.fsf.org/copyleft/lgpl.html.
 *
 * From Binary XML Content Format Specification Version 1.3, 25 July 2001
 * found at http://www.wapforum.org
 *
 * @package XML_WBXML
 */
class XML_WBXML_ContentHandler {

    var $_currentUri;
    var $_output = '';

    var $_opaqueHandler;

    /**
     * Charset.
     */
    var $_charset = 'UTF-8';

    /**
     * WBXML Version.
     * 1, 2, or 3 supported
     */
    var $_wbxmlVersion = 2;

    function XML_WBXML_ContentHandler()
    {
        $this->_currentUri = new XML_WBXML_LifoQueue();
    }

    function raiseError($error)
    {
        include_once 'PEAR.php';
        return PEAR::raiseError($error);
    }

    function getCharsetStr()
    {
        return $this->_charset;
    }

    function setCharset($cs)
    {
        $this->_charset = $cs;
    }

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

    function setVersion($v)
    {
        $this->_wbxmlVersion = 2;
    }

    function getOutput()
    {
        return $this->_output;
    }

    function getOutputSize()
    {
        return strlen($this->_output);
    }

    function startElement($uri, $element, $attrs)
    {
        $this->_output .= '<' . $element;

        $currentUri = $this->_currentUri->top();

        if (((!$currentUri) || ($currentUri != $uri)) && $uri) {
            $this->_output .= ' xmlns="' . $uri . '"';
        }

        $this->_currentUri->push($uri);

        foreach ($attrs as $attr) {
            $this->_output .= ' ' . $attr['attribute'] . '="' . $attr['value'] . '"';
        }

        $this->_output .= '>';
    }

    function endElement($uri, $element)
    {
        $this->_output .= '</' . $element . '>';

        $this->_currentUri->pop();
    }

    function characters($str)
    {
        $this->_output .= $str;
    }

    function opaque($o)
    {
        // I can check the first chanracter and see if it is WBXML.
        if (ord($o[0]) < 10) {
            // Should decode this, I really need a call back function.
        } else {
            $this->_output .= $o;
        }
    }

    function setOpaqueHandler($opaqueHandler)
    {
        $this->_opaqueHandler = $opaqueHandler;
    }

    function removeOpaqueHandler()
    {
        unset($this->_opaqueHandler);
    }

}

class XML_WBXML_LifoQueue {

    var $_queue = array();

    function XML_WBXML_LifoQueue()
    {
    }

    function push($obj)
    {
        $this->_queue[] = $obj;
    }

    function pop()
    {
        if (count($this->_queue)) {
            return array_pop($this->_queue);
        } else {
            return null;
        }
    }

    function top()
    {
        if ($count = count($this->_queue)) {
            return $this->_queue[$count - 1];
        } else {
            return null;
        }
    }

}