Compress.php

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<?php
#require_once 'Zend/Filter/Interface.php';

class Zend_Filter_Compress implements Zend_Filter_Interface
{
    protected $_adapter = 'Gz';

    protected $_adapterOptions = array();

    public function __construct($options = null)
    {
        if ($options instanceof Zend_Config) {
            $options = $options->toArray();
        }
        if (is_string($options)) {
            $this->setAdapter($options);
        } elseif ($options instanceof Zend_Filter_Compress_CompressInterface) {
            $this->setAdapter($options);
        } elseif (is_array($options)) {
            $this->setOptions($options);
        }
    }

    public function setOptions(array $options)
    {
        foreach ($options as $key => $value) {
            if ($key == 'options') {
                $key = 'adapterOptions';
            }
            $method = 'set' . ucfirst($key);
            if (method_exists($this, $method)) {
                $this->$method($value);
            }
        }
        return $this;
    }

    public function getAdapter()
    {
        if ($this->_adapter instanceof Zend_Filter_Compress_CompressInterface) {
            return $this->_adapter;
        }

        $adapter = $this->_adapter;
        $options = $this->getAdapterOptions();
        if (!class_exists($adapter)) {
            #require_once 'Zend/Loader.php';
            if (Zend_Loader::isReadable('Zend/Filter/Compress/' . ucfirst($adapter) . '.php')) {
                $adapter = 'Zend_Filter_Compress_' . ucfirst($adapter);
            }
            Zend_Loader::loadClass($adapter);
        }

        $this->_adapter = new $adapter($options);
        if (!$this->_adapter instanceof Zend_Filter_Compress_CompressInterface) {
            #require_once 'Zend/Filter/Exception.php';
            throw new Zend_Filter_Exception("Compression adapter '" . $adapter . "' does not implement Zend_Filter_Compress_CompressInterface");
        }
        return $this->_adapter;
    }

    public function getAdapterName()
    {
        return $this->getAdapter()->toString();
    }

    public function setAdapter($adapter)
    {
        if ($adapter instanceof Zend_Filter_Compress_CompressInterface) {
            $this->_adapter = $adapter;
            return $this;
        }
        if (!is_string($adapter)) {
            #require_once 'Zend/Filter/Exception.php';
            throw new Zend_Filter_Exception('Invalid adapter provided; must be string or instance of Zend_Filter_Compress_CompressInterface');
        }
        $this->_adapter = $adapter;

        return $this;
    }

    public function getAdapterOptions()
    {
        return $this->_adapterOptions;
    }

    public function setAdapterOptions(array $options)
    {
        $this->_adapterOptions = $options;
        return $this;
    }

    public function __call($method, $options)
    {
        $adapter = $this->getAdapter();
        if (!method_exists($adapter, $method)) {
            #require_once 'Zend/Filter/Exception.php';
            throw new Zend_Filter_Exception("Unknown method '{$method}'");
        }

        return call_user_func_array(array($adapter, $method), $options);
    }

    public function filter($value)
    {
        return $this->getAdapter()->compress($value);
    }
}