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<?php

class Requests_Response_Headers extends Requests_Utility_CaseInsensitiveDictionary
{
    public function offsetGet($key)
    {
        $key = strtolower($key);
        if (!isset($this->data[$key])) {
            return null;
        }
        return $this->flatten($this->data[$key]);
    }
    public function offsetSet($key, $value)
    {
        if ($key === null) {
            throw new Requests_Exception('Object is a dictionary, not a list', 'invalidset');
        }
        $key = strtolower($key);
        if (!isset($this->data[$key])) {
            $this->data[$key] = array();
        }
        $this->data[$key][] = $value;
    }
    public function getValues($key)
    {
        $key = strtolower($key);
        if (!isset($this->data[$key])) {
            return null;
        }
        return $this->data[$key];
    }
    public function flatten($value)
    {
        if (is_array($value)) {
            $value = implode(',', $value);
        }
        return $value;
    }
    public function getIterator()
    {
        return new Requests_Utility_FilteredIterator($this->data, array($this, 'flatten'));
    }
}