org.netfrag.glib/DesignPattern/Proxy.php

<?php
/**
 * This file contains the DesignPattern::Proxy class
 *
 * @author Andreas Motl <andreas.motl@ilo.de>
 * @package org.netfrag.glib
 * @name DesignPattern::Proxy
 * @filesource
 *
 *
 *
 *
 * <b>Cvs-Log:</b>
 *
 * <pre>
 * $Id: Proxy.php,v 1.4 2003/03/05 16:32:18 joko Exp $
 *
 * $Log: Proxy.php,v $
 * Revision 1.4  2003/03/05 16:32:18  joko
 * updated docu (phpDocumentor testing....)
 *
 * Revision 1.3  2003/03/05 16:10:17  joko
 * updated docu (phpDocumentor testing....)
 *
 * Revision 1.2  2003/03/05 12:12:42  joko
 * re-renamed methods and privates: _handler becomes _proxy again
 *
 * Revision 1.1  2003/03/03 22:05:25  joko
 * abstract implementation...  ;-)
 * </pre>
 *
 *
 */


/**
 * Load required modules:
 *
 */
loadModule('Class::Logger');


/**
 * An attempt to implement some software design patterns...
 * --- ProxyPattern
 *
 * @link http://c2.com/cgi-bin/wiki?ProxyPattern
 *
 * @author Andreas Motl <andreas.motl@ilo.de>
 * @link http://www.netfrag.org/~joko/
 *
 * @copyright (c) 2003 - All Rights reserved.
 * @license GNU LGPL (GNU Lesser General Public License)
 * @link http://www.gnu.org/licenses/lgpl.txt
 *
 * @package org.netfrag.glib
 * @subpackage DesignPattern
 * @name DesignPattern::Proxy
 *
 * @todo
 * <pre>
 *    x DesignPattern::DecoratorProxy  (->decorate)
 *    x DesignPattern::TransparentProxy  (->make_transparent)
 *    o DesignPattern::MultiProxy   (->both???) (diamond inheritance? possible in php?)
 *    o DesignPattern::GenericAdapterProxy???
 *      o no 'locator/query' or 'type/component'
 *      o even more generic: just 'adapter_metadata'    (-> global adapter registry?)
 * </pre>
 *
 */
class DesignPattern_Proxy extends Class_Logger {

  /**
   * This holds some information about the tracing level.
   *
   */
  var $_debug = array(
    notice => 1,
    trace => 1,
    payload => 1,
  );

  var $_component_name;
  var $_component_options;

  /**
   * This var holds the Handler object
   * that is used to do the work.
   * It acts as a dispatcher combining result caching.
   * It is assumed that this provides 4 methods:
   * queryData() - execute a query against a data storage
   * querySchema() - execute a query against underlying storage metadata
   * sendCommand() - send a command against an arbitrary execution engine
   * ... or others! (these are just proposals for convenience)
   *
   */
  var $_proxy = NULL;
  
  
  /**
   * This var holds options fed to the Proxy object
   * These are built from locator metadata (_locator) and query arguments (_query)
   * It's a simple structured hash:
   *  $proxy_options = array(
   *    method => '<remote-method-name>',
   *    args => array('list', 'of', 'arguments')
   *  );
   *
   */
  var $_proxy_options = NULL;


  function about() {
    $this->_about = 
<<<ABOUT
 * --- DesignPattern::Proxy
 * --- http://cvs.netfrag.org/nfo/php/libs/org.netfrag.glib/DesignPattern/Proxy.php
 *
 *  http://c2.com/cgi-bin/wiki?ProxyPattern says...
 *  Intent: Provide a surrogate or placeholder for another object to control access to it. 
 *  http://www.fluffycat.com/java/patterns.html says...
 *  One class controls the creation of and access to objects in another class. 
 
ABOUT;
  }


  function constructor($handler = array()) {
    if (sizeof($handler)) {
      $this->set_proxy($handler);
    }
    $this->create_proxy();
    $this->call_proxy();
  }
        
  /*
  function _abstract_method($method) {
    $package = get_class($this);
    $package_p = get_parent_class($this);
    user_error("DesignPattern::Proxy.$package_p.$package: Please implement method '$method'.");
  }
  */
  

/**
  * Directly inject a Handler instance to use.
  *
  * @param Handler object - &$handler
  *
  */
  function set_proxy( &$handler ) {
      $this->_proxy = &$handler;
  }

  function &get_proxy() {
      return $this->_proxy;
  }

  function call_proxy() {
    $this->_abstract_method('call_proxy', 'DesignPattern::Proxy');
  }

  function set_component_name($name) {
    $this->_component_name = $name;
  }
  function get_component_name() {
    return $this->_component_name;
  }
  function set_component_options_v1() {
    $options = func_get_args();
    if (is_array($options)) {
      if (is_hash($options)) {
        $this->_component_options = $options;
      } else {
        $this->_component_options = array();
        foreach ($options as $option) {
          array_push($this->_component_options, $option);
        }
      }
    } else {
      $this->_component_options = $options;
    }
  }
  function set_component_options() {
    $options = func_get_args();
    if (sizeof($options) >= 1) {
      $this->_component_options = array();
      foreach ($options as $option) {
        array_push($this->_component_options, $option);
      }
    } else {
      $this->_component_options = $options;
    }
  }
  function get_component_options() {
    return $this->_component_options;
  }

  function create_proxy() {
    //print "DesignPattern::Proxy->create_proxy<br/>";
    //print "comp: " . $this->get_component_name() . "<br/>";
    //print "comp: " . $this->get_component_options() . "<br/>";
    $handler = php::mkComponent( $this->get_component_name(), $this->get_component_options() );
    //print Dumper($handler);
    //exit;
    
    $this->set_proxy( $handler );
  }


}

?>
1	<?php
2	/**
3	* This file contains the DesignPattern::Proxy class
4	*
5	* @author Andreas Motl <andreas.motl@ilo.de>
6	* @package org.netfrag.glib
7	* @name DesignPattern::Proxy
8	* @filesource
9	*
10	*
11	*
12	*
13	* <b>Cvs-Log:</b>
14	*
15	* <pre>
16	* $Id: Proxy.php,v 1.4 2003/03/05 16:32:18 joko Exp $
17	*
18	* $Log: Proxy.php,v $
19	* Revision 1.4 2003/03/05 16:32:18 joko
20	* updated docu (phpDocumentor testing....)
21	*
22	* Revision 1.3 2003/03/05 16:10:17 joko
23	* updated docu (phpDocumentor testing....)
24	*
25	* Revision 1.2 2003/03/05 12:12:42 joko
26	* re-renamed methods and privates: _handler becomes _proxy again
27	*
28	* Revision 1.1 2003/03/03 22:05:25 joko
29	* abstract implementation... ;-)
30	* </pre>
31	*
32	*
33	*/
34
35
36	/**
37	* Load required modules:
38	*
39	*/
40	loadModule('Class::Logger');
41
42
43	/**
44	* An attempt to implement some software design patterns...
45	* --- ProxyPattern
46	*
47	* @link http://c2.com/cgi-bin/wiki?ProxyPattern
48	*
49	* @author Andreas Motl <andreas.motl@ilo.de>
50	* @link http://www.netfrag.org/~joko/
51	*
52	* @copyright (c) 2003 - All Rights reserved.
53	* @license GNU LGPL (GNU Lesser General Public License)
54	* @link http://www.gnu.org/licenses/lgpl.txt
55	*
56	* @package org.netfrag.glib
57	* @subpackage DesignPattern
58	* @name DesignPattern::Proxy
59	*
60	* @todo
61	* <pre>
62	* x DesignPattern::DecoratorProxy (->decorate)
63	* x DesignPattern::TransparentProxy (->make_transparent)
64	* o DesignPattern::MultiProxy (->both???) (diamond inheritance? possible in php?)
65	* o DesignPattern::GenericAdapterProxy???
66	* o no 'locator/query' or 'type/component'
67	* o even more generic: just 'adapter_metadata' (-> global adapter registry?)
68	* </pre>
69	*
70	*/
71	class DesignPattern_Proxy extends Class_Logger {
72
73	/**
74	* This holds some information about the tracing level.
75	*
76	*/
77	var $_debug = array(
78	notice => 1,
79	trace => 1,
80	payload => 1,
81	);
82
83	var $_component_name;
84	var $_component_options;
85
86	/**
87	* This var holds the Handler object
88	* that is used to do the work.
89	* It acts as a dispatcher combining result caching.
90	* It is assumed that this provides 4 methods:
91	* queryData() - execute a query against a data storage
92	* querySchema() - execute a query against underlying storage metadata
93	* sendCommand() - send a command against an arbitrary execution engine
94	* ... or others! (these are just proposals for convenience)
95	*
96	*/
97	var $_proxy = NULL;
98
99
100	/**
101	* This var holds options fed to the Proxy object
102	* These are built from locator metadata (_locator) and query arguments (_query)
103	* It's a simple structured hash:
104	* $proxy_options = array(
105	* method => '<remote-method-name>',
106	* args => array('list', 'of', 'arguments')
107	* );
108	*
109	*/
110	var $_proxy_options = NULL;
111
112
113	function about() {
114	$this->_about =
115	<<<ABOUT
116	* --- DesignPattern::Proxy
117	* --- http://cvs.netfrag.org/nfo/php/libs/org.netfrag.glib/DesignPattern/Proxy.php
118	*
119	* http://c2.com/cgi-bin/wiki?ProxyPattern says...
120	* Intent: Provide a surrogate or placeholder for another object to control access to it.
121	* http://www.fluffycat.com/java/patterns.html says...
122	* One class controls the creation of and access to objects in another class.
123
124	ABOUT;
125	}
126
127
128	function constructor($handler = array()) {
129	if (sizeof($handler)) {
130	$this->set_proxy($handler);
131	}
132	$this->create_proxy();
133	$this->call_proxy();
134	}
135
136	/*
137	function _abstract_method($method) {
138	$package = get_class($this);
139	$package_p = get_parent_class($this);
140	user_error("DesignPattern::Proxy.$package_p.$package: Please implement method '$method'.");
141	}
142	*/
143
144
145	/**
146	* Directly inject a Handler instance to use.
147	*
148	* @param Handler object - &$handler
149	*
150	*/
151	function set_proxy( &$handler ) {
152	$this->_proxy = &$handler;
153	}
154
155	function &get_proxy() {
156	return $this->_proxy;
157	}
158
159	function call_proxy() {
160	$this->_abstract_method('call_proxy', 'DesignPattern::Proxy');
161	}
162
163	function set_component_name($name) {
164	$this->_component_name = $name;
165	}
166	function get_component_name() {
167	return $this->_component_name;
168	}
169	function set_component_options_v1() {
170	$options = func_get_args();
171	if (is_array($options)) {
172	if (is_hash($options)) {
173	$this->_component_options = $options;
174	} else {
175	$this->_component_options = array();
176	foreach ($options as $option) {
177	array_push($this->_component_options, $option);
178	}
179	}
180	} else {
181	$this->_component_options = $options;
182	}
183	}
184	function set_component_options() {
185	$options = func_get_args();
186	if (sizeof($options) >= 1) {
187	$this->_component_options = array();
188	foreach ($options as $option) {
189	array_push($this->_component_options, $option);
190	}
191	} else {
192	$this->_component_options = $options;
193	}
194	}
195	function get_component_options() {
196	return $this->_component_options;
197	}
198
199	function create_proxy() {
200	//print "DesignPattern::Proxy->create_proxy<br/>";
201	//print "comp: " . $this->get_component_name() . "<br/>";
202	//print "comp: " . $this->get_component_options() . "<br/>";
203	$handler = php::mkComponent( $this->get_component_name(), $this->get_component_options() );
204	//print Dumper($handler);
205	//exit;
206
207	$this->set_proxy( $handler );
208	}
209
210
211	}
212
213	?>
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