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<?php |
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|
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/** |
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* This file contains the DesignPattern::Proxy class. |
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* |
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* @author Andreas Motl <andreas.motl@ilo.de> |
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* @module DesignPattern::Proxy |
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* |
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*/ |
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|
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/** |
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* $Id: MVC.php,v 1.4 2003/03/01 22:44:54 joko Exp $ |
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* |
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* $Log: MVC.php,v $ |
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* |
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*/ |
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|
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|
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/** |
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* --- An attempt to implement some software design patterns... |
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* --- ProxyPattern |
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* |
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* --- http://c2.com/cgi-bin/wiki?ProxyPattern |
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* |
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* @author Andreas Motl <andreas.motl@ilo.de> |
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* @copyright (c) 2003 - All Rights reserved. |
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* @license GNU LGPL (GNU Lesser General Public License) |
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* |
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* @author-url http://www.netfrag.org/~joko/ |
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* @license-url http://www.gnu.org/licenses/lgpl.txt |
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* |
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* @package org.netfrag.glib |
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* @module DesignPattern::Proxy |
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* |
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*/ |
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|
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/** |
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* Todo: |
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* |
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* x DesignPattern::DecoratorProxy (->decorate) |
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* x DesignPattern::TransparentProxy (->make_transparent) |
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* o DesignPattern::MultiProxy (->both???) (diamond inheritance? possible in php?) |
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* o DesignPattern::GenericAdapterProxy??? |
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* o no 'locator/query' or 'type/component' |
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* o even more generic: just 'adapter_metadata' (-> global adapter registry?) |
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|
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|
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* |
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* |
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*/ |
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|
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/** |
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* Load required modules: |
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* |
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*/ |
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loadModule('Class::Logger'); |
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|
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class DesignPattern_Proxy extends Class_Logger { |
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|
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/** |
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* This holds some information about the tracing level. |
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* |
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*/ |
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var $_debug = array( |
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notice => 0, |
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trace => 0, |
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payload => 0, |
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); |
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|
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var $_component_name; |
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var $_component_options; |
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|
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/** |
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* This var holds the Handler object |
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* that is used to do the work. |
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* It acts as a dispatcher combining result caching. |
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* It is assumed that this provides 4 methods: |
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* queryData() - execute a query against a data storage |
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* querySchema() - execute a query against underlying storage metadata |
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* sendCommand() - send a command against an arbitrary execution engine |
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* ... or others! (these are just proposals for convenience) |
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* |
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*/ |
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var $_handler = NULL; |
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|
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|
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/** |
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* This var holds options fed to the Proxy object |
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* These are built from locator metadata (_locator) and query arguments (_query) |
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* It's a simple structured hash: |
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* $proxy_options = array( |
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* method => '<remote-method-name>', |
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* args => array('list', 'of', 'arguments') |
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* ); |
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* |
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*/ |
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var $_handler_options = NULL; |
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|
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|
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function about() { |
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$this->_about = |
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<<<ABOUT |
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* --- DesignPattern::Proxy |
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* --- http://cvs.netfrag.org/nfo/php/libs/org.netfrag.glib/DesignPattern/Proxy.php |
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* |
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* http://c2.com/cgi-bin/wiki?ProxyPattern says... |
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* Intent: Provide a surrogate or placeholder for another object to control access to it. |
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* http://www.fluffycat.com/java/patterns.html says... |
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* One class controls the creation of and access to objects in another class. |
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|
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ABOUT; |
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} |
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|
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|
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function constructor($handler = array()) { |
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if (sizeof($handler)) { |
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$this->set_handler($handler); |
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} |
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$this->create_handler(); |
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$this->call_handler(); |
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} |
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|
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/* |
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function _abstract_method($method) { |
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$package = get_class($this); |
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$package_p = get_parent_class($this); |
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user_error("DesignPattern::Proxy.$package_p.$package: Please implement method '$method'."); |
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} |
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*/ |
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|
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|
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/** |
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* Directly inject a Handler instance to use. |
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* |
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* @param Handler object - &$handler |
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* |
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*/ |
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function set_handler( &$handler ) { |
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$this->_handler = &$handler; |
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} |
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|
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function &get_handler() { |
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return $this->_handler; |
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} |
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|
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function call_handler() { |
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$this->_abstract_method('call_handler', 'DesignPattern::Proxy'); |
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} |
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|
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function set_component_name($name) { |
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$this->_component_name = $name; |
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} |
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function get_component_name() { |
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return $this->_component_name; |
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} |
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function set_component_options($options) { |
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$this->_component_options= $options; |
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} |
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function get_component_options() { |
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return $this->_component_options; |
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} |
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|
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function create_handler() { |
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//print "DesignPattern::Proxy->create_handler<br/>"; |
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//print "comp: " . $this->get_component_name() . "<br/>"; |
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//print "comp: " . $this->get_component_options() . "<br/>"; |
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$handler = php::mkComponent( $this->get_component_name(), $this->get_component_options() ); |
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//print Dumper($handler); |
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//exit; |
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|
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$this->set_handler( $handler ); |
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} |
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|
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|
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} |
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|
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?> |
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