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<?php
/**
* Objects.php
* 01-Oct-2011
*
* PHP Version 5
*
* @category Services
* @package Services_OpenStreetMap
* @author Ken Guest <kguest@php.net>
* @license BSD http://www.opensource.org/licenses/bsd-license.php
* @link Ways.php
*/

/**
* Services_OpenStreetMap_Objects
*
* @category Services
* @package Services_OpenStreetMap
* @author Ken Guest <kguest@php.net>
* @license BSD http://www.opensource.org/licenses/bsd-license.php
* @link Objects.php
*/
class Services_OpenStreetMap_Objects implements Iterator, ArrayAccess, Countable
{

    protected $xml = null;

    protected $objects = null;

    protected $position = 0;

    protected $transport = null;

    protected $config = null;

    /**
* getXml
*
* @return string
*/
    public function getXml()
    {
        return $this->xml;
    }

    /**
* setXml
*
* @param mixed $xml OSM XML
*
* @return void
*/
    public function setXml(SimpleXMLElement $xml)
    {
        $this->xml = $xml->saveXML();
        $objs = $xml->xpath('//' . $this->getType());
        foreach ($objs as $obj) {
            $this->objects[] = $obj->saveXML();
        }
        return $this;
    }

    /**
* Store a specified value.
*
* @param string $value Most likely an id value, returned from the server.
*
* @return void
*/
    public function setVal($value)
    {
        $this->xml = $value;
        return $this;
    }


    /**
* Return the number of objects
*
* @return void
*/
    public function count()
    {
        return sizeof($this->objects);
    }

    /**
* Resets the internal iterator pointer
*
* @return void
*/
    public function rewind()
    {
        $this->position = 0;
    }

    /**
* Return the current object
*
* @return Services_OpenStreetMap_Object
*/
    public function current()
    {
        $class = 'Services_OpenStreetMap_' . ucfirst(strtolower($this->getType()));
        $way = new $class();
        $config = $this->getConfig();
        if (!is_null($config)) {
            $way->setConfig($config);
        }
        $way->setTransport($this->getTransport());
        $way->setXml(simplexml_load_string($this->objects[$this->position]));
        return $way;
    }

    /**
* Advance the internal iterator pointer
*
* @return void
*/
    public function next()
    {
        ++$this->position;
    }

    /**
* Return the key of the current internal iterator pointer
*
* @return void
*/
    public function key()
    {
        return $this->position;
    }

    /**
* Returns whether the current internal iterator pointer is pointing to an
* existing/valid value.
*
* @return bool
*/
    public function valid()
    {
        return isset($this->objects[$this->position]);
    }

    /**
* Check if the specified offset exists.
*
* @param int $offset N/A.
*
* @return bool
*/
    public function offsetExists($offset)
    {
        return isset($this->objects[$offset]);
    }

    /**
* Get object from the specified offset.
*
* @param int $offset N/A.
*
* @return Services_OpenStreetMap_Object
*/
    public function offsetGet($offset)
    {
        $class = 'Services_OpenStreetMap_' . ucfirst(strtolower($this->getType()));
        $way = new $class();
        $config = $this->getConfig();
        if (!is_null($config)) {
            $way->setConfig($config);
        }
        $way->setTransport($this->getTransport());
        if (isset($this->objects[$offset])) {
            $way->setXml(simplexml_load_string($this->objects[$offset]));
            return $way;
        }
    }

    /**
* Does nothing as collection is read-only: required for ArrayAccess.
*
* @param int $offset N/A
* @param Services_OpenStreetMap_Object $value N/A
*
* @return void
* @throws LogicException
*/
    public function offsetSet($offset, $value)
    {
        throw new LogicException('Changing properties not implemented');
    }

    /**
* Does nothing as collection is read-only: required for ArrayAccess.
*
* @param int $offset N/A.
*
* @return void
* @throws LogicException
*/
    public function offsetUnset($offset)
    {
        throw new LogicException('Changing properties not implemented');
    }

    /**
* Set Config object
*
* @param Services_OpenStreetMap_Config $config Config object
*
* @return Services_OpenStreetMap_Changeset
*/
    public function setConfig(Services_OpenStreetMap_Config $config)
    {
        $this->config = $config;
        return $this;
    }

    /**
* Get current Config object
*
* @return Services_OpenStreetMap_Config
*/
    public function getConfig()
    {
        return $this->config;
    }

    /**
* Set the Transport instance.
*
* @param Services_OpenStreetMap_Transport $transport Transport instance.
*
* @return Services_OpenStreetMap_Config
*/
    public function setTransport($transport)
    {
        $this->transport = $transport;
        return $this;
    }

    /**
* Retrieve the current Transport instance.
*
* @return Services_OpenStreetMap_Transport.
*/
    public function getTransport()
    {
        return $this->transport;
    }
}

?>
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