org.netfrag.glib/DataSource/Locator.php

<?php
/**
 * This file contains the DataSource::Locator class.
 *
 * It acts as a container for DataSource connection 
 * metadata. Think of it as an enhanced dsn.
 *
 * It gets used by DataSource::Generic
 * to be informed about the most important stuff it
 * has to do.
 *
 * @author Andreas Motl <andreas.motl@ilo.de>
 * @package org.netfrag.glib
 * @name DataSource::Locator
 *
 *
 */


/**
 * <b>Cvs-Log:</b>
 *
 * <pre>
 * $Id: Locator.php,v 1.24 2003/03/11 04:49:25 joko Exp $
 *
 * $Log: Locator.php,v $
 * Revision 1.24  2003/03/11 04:49:25  joko
 * + fixed metadata for phpDocumentor
 *
 * Revision 1.23  2003/03/11 04:15:01  joko
 * + fixed metadata for phpDocumentor
 *
 * Revision 1.22  2003/03/11 04:03:54  joko
 * + fixed metadata for phpDocumentor
 *
 * Revision 1.21  2003/03/11 03:23:36  joko
 * + fixed metadata for phpDocumentor
 *
 * Revision 1.20  2003/03/11 03:17:37  joko
 * + fixed metadata for phpDocumentor
 *
 * Revision 1.19  2003/03/11 03:05:01  joko
 * + fixed metadata for phpDocumentor
 *
 * Revision 1.18  2003/03/11 02:42:51  joko
 * + fixed metadata for phpDocumentor
 *
 * Revision 1.17  2003/03/11 02:34:55  joko
 * + fixed metadata for phpDocumentor
 *
 * Revision 1.16  2003/03/11 02:28:12  joko
 * + fixed metadata for phpDocumentor
 *
 * Revision 1.15  2003/03/11 02:23:03  joko
 * + fixed metadata for phpDocumentor
 *
 * Revision 1.14  2003/03/11 02:14:24  joko
 * + fixed metadata for phpDocumentor
 *
 * Revision 1.13  2003/03/11 02:04:37  joko
 * + fixed metadata for phpDocumentor
 *
 * Revision 1.12  2003/03/11 01:10:00  joko
 * + fixed metadata for phpDocumentor
 *
 * Revision 1.11  2003/03/11 00:12:49  joko
 * + fixed metadata for phpDocumentor
 *
 * Revision 1.10  2003/03/10 23:25:03  joko
 * + fixed metadata for phpDocumentor
 *
 * Revision 1.9  2003/03/10 22:31:55  joko
 * + fixed metadata for phpDocumentor
 *
 * Revision 1.8  2003/03/09 15:50:36  joko
 * + additional metadata for Autodia
 *
 * Revision 1.7  2003/03/05 17:13:16  joko
 * updated docu (phpDocumentor testing....)
 *
 * Revision 1.6  2003/03/05 16:10:08  joko
 * updated docu (phpDocumentor testing....)
 *
 * Revision 1.5  2003/03/05 15:40:39  joko
 * updated docu (phpDocumentor testing....)
 *
 * Revision 1.4  2003/03/05 15:26:23  joko
 * updated docu (phpDocumentor testing....)
 *
 * Revision 1.3  2003/03/05 15:21:54  joko
 * updated docu (phpDocumentor testing....)
 *
 * Revision 1.2  2003/03/05 15:01:10  joko
 * updated docu
 *
 * Revision 1.1  2003/03/05 12:04:37  joko
 * + initial commit
 * </pre>
 *
 *
 */

/**
 * It helps DataSource::Generic working in different "operation modes".
 *
 * <b>Modes:</b> (these are proposals, more or less...)
 * o Pass-Through-Reference: php Object will get passed through all layers
 * o Pass-Through-Memory: reference to a memory area will get used
 * + Build-Locator: build locator from datasource-type and adapter-type
 * o Use-Locator: directly use DataSource::Locator instance passed in
 * o Merge-Locators: merge metadata of two or more DataSource::Locator instances
 * o Build-AutoLocator: use global constants making up our metadata
 *
 * <b>It can/should contain:</b>
 * (flexible, just some parameters are required for each operation mode)
 * o an oldschool "dsn"-string (e.g. for rdbms-connection via PEAR)
 * + (x) name of a Proxy module to use to *wrap/hide* the connection/transport-layer
 *   (e.g. DataSource::Proxy::XMLRPC via DesignPattern::RemoteProxy)
 * + (x) metadata (a hash) directly describing *where* to connect to (e.g. 'Host', 'Port')
 * o an instance of an already instantiated arbitrary datasource handler (e.g. 'source')
 *   this will get propagated (pass-through-mode)
 * o a datasource-type (of 'rpc|mysql|csv-file|xml-file')
 *   this will be mapped to a module name and used as a *Proxy* 
 *   by the DataSource::Generic at runtime
 * + (x) an adapter-type (of 'phpHtmlLib|pear')
 *   this will be mapped to a module name and used as an *Adapter*
 *   by the DataSource::Generic at runtime
 * o names of global constants where to find these informations
 * o datasource-type ('rpc|csv-file|...') <-> datasource-family ('orm|rdbms|odbms')
 *
 * <b>It can do:</b>
 * - builds a larger locator from a minimum of information passed in via constructor-arguments
 * - direct fallback mode to some predefined constant names if locator is empty and above method fails
 * - direct fallback mode to some predefined values if just *everything* fails
 *
 * <b>How to use?</b>
 *
 * Pass an array holding "locator metadata" to the constructor.
 * This module takes care of the rest.
 * Pass an array to the constructor: (e.g.)
 *
 * <code>
 * <?php
 *    // 1. for doing rpc-calls....
 *    $locator = array(
 *      datasource_type =&gt;&gt; 'rpc',
 *      [adapter_type => 'phpHtmlLib',]
 *      metadata => array( Host => 'localhost', Port => '8765' ),
 *    );
 *    $source = ne w DataSource::Generic($locator);
 *    $this->set_data_source( &$source );
 * ?>
 * </code>
 * <code>
 * <?php
 *    // 2. [proposal] for common/oldschool datahandles....
 *    $locator = array(
 *      dsn => 'known dsn markup',
 *    );
 *    $source = ne w DataSource::Generic($locator);
 *    $this->set_data_source( &$source );
 * ?>
 * </code>
 *
 *
 *
 * @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 DataSource
 * @name DataSource::Locator
 *
 */
class DataSource_Locator {

  /**
    * This var holds the locator metadata hash,
    *
    * which is built from some predefined rules
    * using metadata from $_options and some
    * other presets.
    *
    * See {@link build}, which acts as a dispatcher
    * depending on $_options[datasource]. <br>
    * (main dispatching level)
    *
    * <br>
    *
    * The structure of a full blown locator looks like this:
    * <code>
    *  $locator = array(
    *    type => '<your type specifying the datasource-type>',
    *    metadata => array(
    *       ... your arbitrary deep metadata structure ...
    *    ),
    *    [dsn => '<your dsn markup>'],
    *  );
    * </code>
    *
    * Example 1 - data is inside a rdbms, using a dsn to connect to it:
    * <code>
    *  $locator = array(
    *    dsn => 'mysql://username:password@localhost/database',
    *  );
    * </code>
    *
    * Example 2 - data is inside an odbms, reachable by doing remote procedure calls (rpc):
    * <code>
    *  $locator = array(
    *    type => 'rpc',
    *    metadata => array(
    *      package => 'Data::Driver::Proxy',
    *      Host => 'localhost',
    *      Port => '8765',
    *    )
    *  );
    * </code>
    *
    * @deprecated
    *
    */
    var $_locator_metadata = NULL;


   /**
    * This var holds the arguments passed in to the constructor.
    * We will try to build full blown locator metadata information from that.
    *
    * @deprecated
    *
    */
    var $_in = NULL;

   /**
    * This var holds the locator metadata informations inside
    * a single hash. This is returned from '->get()'.
    *
    * @deprecated
    *
    */
    var $_out = NULL;


        /**
         * Locator metadata.
         *
         */

    // name of a Proxy module
    var $_datasource_type;
    
    // name of an Adapter module
    var $_adapter_type;
    
    // additional information required (passed on to the Proxy by DataSource::Generic)
    var $_metadata = array();
    
    //var $_dsn;
    

        /**
         * The constructor is used to pass in the
         * locator metadata hash.
         *
         * @param object(DataSource::Locator)|hash optional: a &$locator instance
         */
        function DataSource_Locator() {
      $args_multi = func_get_args();
      
      //php::array_shrink($args_multi);

      //print Dumper($args_multi);
      //exit;

      foreach ($args_multi as $args) {
        if (isset($args)) {
          $this->merge_args($args);
        }
      }

      $this->build();
      //$this->check();
        }
        
        function merge_args(&$args) {
          
          //print "args: " . Dumper($args);
          
                // check if passed in locator is already of type *me* ...
                // ... if so, merge it into current instance
                if (is_object($args) && get_class($args) == get_class($this)) {
                  $this->merge_to($this, $args);

                } else {
                
        // FIXME: handle locator merging here?
        //$this->_arguments = &$args;
        
        // FIXME: to php::merge_to($this, $locator) here!!!
        //$this->_data
        // for now: assume plain hash, so just iterate and overwrite!
        $this->merge_to($this, $args, '_');

      }
        }
        
        function merge_to(&$target, $source, $prefix_key = '') {

      //print "target: " . Dumper($target);
      //print "source: " . Dumper($source);

      // pre-flight checks
        if (!isset($target)) {
          user_error("variable passed as reference (merge target) is not set.");
          return;
        }
        //if (!is_hash($hash)) {
        if (!isset($source)) {
          user_error("variable passed as source is not set.");
          return;
        }

      // perform merge
        foreach ($source as $key => $val) {
          $name = $prefix_key . $key;
          if (is_object($target)) {
            $target->$name = $val;
          //} elseif (php::is_hash($target)) {
          } else {
            $target[$name] = $val;
          }
        }

      // indicate good
        return 1;

        }
        
        /**
     * Set the locator metadata hash we will feed *partly*
     * to an encapsulated Data::Driver::Proxy instance
     *
     * @param LocatorMetadataHash array - 
     *
     */
    function set( &$locator ) {
        $this->_out = &$locator;
    }

    function &get_metadata() {
        //return ($this->_out);
        return $this->_metadata;
    }


  function build( ) {
    
    // trace
      //print Dumper($this);
    
    $good = 0;
    switch ($this->_datasource_type) {
      case 'rpc':
        // get rpc connection information from global constants
        $metadata = array(
          //package => 'Data::Driver::Proxy',
          //package => 'DataSource::Proxy::XMLRPC',
          //package => 'DataSource::Generic',
          //package => 'DesignPattern::RemoteProxy',
          Host => RPC_HOSTNAME,
          Port => RPC_PORT,
        );
        $good = 1;
        break;
    }
    
    if ($good) {
      
      // V1:
      /*
      $this->_out = array(
        datasource_type => $datasource,
        adapter_type => 'Data',
        metadata => $metadata,
      );
      */

      // V2:
      //$this->_out = $metadata;
      
      // V3:
      $this->merge_to($this->_metadata, $metadata);
      
    }

    // trace
      //print Dumper($this);

  }
  
  function check() {  
    if (!sizeof($this->_metadata)) {
      user_error("DataSource::Locator::check() failed: " . "Locator metadata not established, please check configuration options.");
      return;
    }
    return 1;
  }

    
}

?>
1	joko	1.1	<?php
2			/**
3	joko	1.2	* This file contains the DataSource::Locator class.
4	joko	1.1	*
5			* It acts as a container for DataSource connection
6			* metadata. Think of it as an enhanced dsn.
7			*
8	joko	1.3	* It gets used by DataSource::Generic
9	joko	1.1	* to be informed about the most important stuff it
10			* has to do.
11			*
12	joko	1.5	* @author Andreas Motl <andreas.motl@ilo.de>
13	joko	1.1	* @package org.netfrag.glib
14	joko	1.7	* @name DataSource::Locator
15			*
16			*
17	joko	1.10	*/
18
19
20			/**
21	joko	1.7	* <b>Cvs-Log:</b>
22	joko	1.1	*
23	joko	1.7	* <pre>
24	joko	1.25	* $Id: Locator.php,v 1.24 2003/03/11 04:49:25 joko Exp $
25	joko	1.2	*
26			* $Log: Locator.php,v $
27	joko	1.25	* Revision 1.24 2003/03/11 04:49:25 joko
28			* + fixed metadata for phpDocumentor
29			*
30	joko	1.24	* Revision 1.23 2003/03/11 04:15:01 joko
31			* + fixed metadata for phpDocumentor
32			*
33	joko	1.23	* Revision 1.22 2003/03/11 04:03:54 joko
34			* + fixed metadata for phpDocumentor
35			*
36	joko	1.22	* Revision 1.21 2003/03/11 03:23:36 joko
37			* + fixed metadata for phpDocumentor
38			*
39	joko	1.21	* Revision 1.20 2003/03/11 03:17:37 joko
40			* + fixed metadata for phpDocumentor
41			*
42	joko	1.20	* Revision 1.19 2003/03/11 03:05:01 joko
43			* + fixed metadata for phpDocumentor
44			*
45	joko	1.19	* Revision 1.18 2003/03/11 02:42:51 joko
46			* + fixed metadata for phpDocumentor
47			*
48	joko	1.18	* Revision 1.17 2003/03/11 02:34:55 joko
49			* + fixed metadata for phpDocumentor
50			*
51	joko	1.17	* Revision 1.16 2003/03/11 02:28:12 joko
52			* + fixed metadata for phpDocumentor
53			*
54	joko	1.16	* Revision 1.15 2003/03/11 02:23:03 joko
55			* + fixed metadata for phpDocumentor
56			*
57	joko	1.15	* Revision 1.14 2003/03/11 02:14:24 joko
58			* + fixed metadata for phpDocumentor
59			*
60	joko	1.14	* Revision 1.13 2003/03/11 02:04:37 joko
61			* + fixed metadata for phpDocumentor
62			*
63	joko	1.13	* Revision 1.12 2003/03/11 01:10:00 joko
64			* + fixed metadata for phpDocumentor
65			*
66	joko	1.12	* Revision 1.11 2003/03/11 00:12:49 joko
67			* + fixed metadata for phpDocumentor
68			*
69	joko	1.11	* Revision 1.10 2003/03/10 23:25:03 joko
70			* + fixed metadata for phpDocumentor
71			*
72	joko	1.10	* Revision 1.9 2003/03/10 22:31:55 joko
73			* + fixed metadata for phpDocumentor
74			*
75	joko	1.9	* Revision 1.8 2003/03/09 15:50:36 joko
76			* + additional metadata for Autodia
77			*
78	joko	1.8	* Revision 1.7 2003/03/05 17:13:16 joko
79			* updated docu (phpDocumentor testing....)
80			*
81	joko	1.7	* Revision 1.6 2003/03/05 16:10:08 joko
82			* updated docu (phpDocumentor testing....)
83			*
84	joko	1.6	* Revision 1.5 2003/03/05 15:40:39 joko
85			* updated docu (phpDocumentor testing....)
86			*
87	joko	1.5	* Revision 1.4 2003/03/05 15:26:23 joko
88			* updated docu (phpDocumentor testing....)
89			*
90	joko	1.4	* Revision 1.3 2003/03/05 15:21:54 joko
91			* updated docu (phpDocumentor testing....)
92			*
93	joko	1.3	* Revision 1.2 2003/03/05 15:01:10 joko
94			* updated docu
95			*
96	joko	1.2	* Revision 1.1 2003/03/05 12:04:37 joko
97			* + initial commit
98	joko	1.7	* </pre>
99	joko	1.1	*
100			*
101			*/
102
103			/**
104	joko	1.3	* It helps DataSource::Generic working in different "operation modes".
105	joko	1.1	*
106	joko	1.13	* <b>Modes:</b> (these are proposals, more or less...)
107	joko	1.7	* o Pass-Through-Reference: php Object will get passed through all layers
108			* o Pass-Through-Memory: reference to a memory area will get used
109	joko	1.11	* + Build-Locator: build locator from datasource-type and adapter-type
110	joko	1.7	* o Use-Locator: directly use DataSource::Locator instance passed in
111			* o Merge-Locators: merge metadata of two or more DataSource::Locator instances
112			* o Build-AutoLocator: use global constants making up our metadata
113			*
114	joko	1.4	* <b>It can/should contain:</b>
115			* (flexible, just some parameters are required for each operation mode)
116	joko	1.7	* o an oldschool "dsn"-string (e.g. for rdbms-connection via PEAR)
117	joko	1.11	* + (x) name of a Proxy module to use to wrap/hide the connection/transport-layer
118	joko	1.2	* (e.g. DataSource::Proxy::XMLRPC via DesignPattern::RemoteProxy)
119	joko	1.11	* + (x) metadata (a hash) directly describing where to connect to (e.g. 'Host', 'Port')
120	joko	1.7	* o an instance of an already instantiated arbitrary datasource handler (e.g. 'source')
121	joko	1.2	* this will get propagated (pass-through-mode)
122	joko	1.7	* o a datasource-type (of 'rpc\|mysql\|csv-file\|xml-file')
123	joko	1.2	* this will be mapped to a module name and used as a Proxy
124	joko	1.3	* by the DataSource::Generic at runtime
125	joko	1.11	* + (x) an adapter-type (of 'phpHtmlLib\|pear')
126	joko	1.2	* this will be mapped to a module name and used as an Adapter
127	joko	1.3	* by the DataSource::Generic at runtime
128	joko	1.7	* o names of global constants where to find these informations
129			* o datasource-type ('rpc\|csv-file\|...') <-> datasource-family ('orm\|rdbms\|odbms')
130	joko	1.1	*
131	joko	1.14	* <b>It can do:</b>
132	joko	1.10	* - builds a larger locator from a minimum of information passed in via constructor-arguments
133			* - direct fallback mode to some predefined constant names if locator is empty and above method fails
134			* - direct fallback mode to some predefined values if just everything fails
135	joko	1.1	*
136	joko	1.4	* <b>How to use?</b>
137	joko	1.1	*
138			* Pass an array holding "locator metadata" to the constructor.
139			* This module takes care of the rest.
140			* Pass an array to the constructor: (e.g.)
141			*
142	joko	1.19	* <code>
143	joko	1.25	* <?php
144	joko	1.22	* // 1. for doing rpc-calls....
145	joko	1.1	* $locator = array(
146	joko	1.24	* datasource_type =>> 'rpc',
147	joko	1.1	* [adapter_type => 'phpHtmlLib',]
148			* metadata => array( Host => 'localhost', Port => '8765' ),
149			* );
150	joko	1.8	* $source = ne w DataSource::Generic($locator);
151	joko	1.1	* $this->set_data_source( &$source );
152	joko	1.25	* ?>
153	joko	1.19	* </code>
154			* <code>
155	joko	1.25	* <?php
156	joko	1.22	* // 2. [proposal] for common/oldschool datahandles....
157	joko	1.1	* $locator = array(
158			* dsn => 'known dsn markup',
159			* );
160	joko	1.8	* $source = ne w DataSource::Generic($locator);
161	joko	1.1	* $this->set_data_source( &$source );
162	joko	1.25	* ?>
163	joko	1.19	* </code>
164	joko	1.1	*
165			*
166			*
167			* @author Andreas Motl <andreas.motl@ilo.de>
168	joko	1.2	* @link http://www.netfrag.org/~joko/
169	joko	1.1	* @copyright (c) 2003 - All Rights reserved.
170	joko	1.2	*
171	joko	1.1	* @license GNU LGPL (GNU Lesser General Public License)
172	joko	1.2	* @link http://www.gnu.org/licenses/lgpl.txt
173	joko	1.1	*
174	joko	1.7	* @package org.netfrag.glib
175			* @subpackage DataSource
176	joko	1.2	* @name DataSource::Locator
177	joko	1.1	*
178			*/
179			class DataSource_Locator {
180
181			/**
182	joko	1.16	* This var holds the locator metadata hash,
183			*
184	joko	1.1	* which is built from some predefined rules
185			* using metadata from $_options and some
186			* other presets.
187			*
188	joko	1.20	* See {@link build}, which acts as a dispatcher
189			* depending on $_options[datasource]. <br>
190			* (main dispatching level)
191	joko	1.1	*
192	joko	1.23	* <br>
193			*
194	joko	1.1	* The structure of a full blown locator looks like this:
195	joko	1.21	* <code>
196	joko	1.1	* $locator = array(
197			* type => '<your type specifying the datasource-type>',
198			* metadata => array(
199			* ... your arbitrary deep metadata structure ...
200			* ),
201			* [dsn => '<your dsn markup>'],
202			* );
203	joko	1.21	* </code>
204	joko	1.1	*
205			* Example 1 - data is inside a rdbms, using a dsn to connect to it:
206	joko	1.21	* <code>
207	joko	1.1	* $locator = array(
208			* dsn => 'mysql://username:password@localhost/database',
209			* );
210	joko	1.21	* </code>
211	joko	1.1	*
212			* Example 2 - data is inside an odbms, reachable by doing remote procedure calls (rpc):
213	joko	1.5	* <code>
214	joko	1.1	* $locator = array(
215			* type => 'rpc',
216			* metadata => array(
217			* package => 'Data::Driver::Proxy',
218			* Host => 'localhost',
219			* Port => '8765',
220			* )
221			* );
222	joko	1.5	* </code>
223			*
224			* @deprecated
225	joko	1.1	*
226			*/
227	joko	1.5	var $_locator_metadata = NULL;
228	joko	1.1
229
230	joko	1.5	/**
231			* This var holds the arguments passed in to the constructor.
232			* We will try to build full blown locator metadata information from that.
233			*
234			* @deprecated
235			*
236			*/
237			var $_in = NULL;
238
239			/**
240			* This var holds the locator metadata informations inside
241			* a single hash. This is returned from '->get()'.
242			*
243			* @deprecated
244			*
245			*/
246			var $_out = NULL;
247	joko	1.1
248
249			/**
250			* Locator metadata.
251			*
252			*/
253
254			// name of a Proxy module
255			var $_datasource_type;
256
257			// name of an Adapter module
258			var $_adapter_type;
259
260	joko	1.3	// additional information required (passed on to the Proxy by DataSource::Generic)
261	joko	1.1	var $_metadata = array();
262
263			//var $_dsn;
264
265
266			/**
267			* The constructor is used to pass in the
268			* locator metadata hash.
269			*
270	joko	1.6	* @param object(DataSource::Locator)\|hash optional: a &$locator instance
271	joko	1.1	*/
272			function DataSource_Locator() {
273			$args_multi = func_get_args();
274
275			//php::array_shrink($args_multi);
276
277			//print Dumper($args_multi);
278			//exit;
279
280			foreach ($args_multi as $args) {
281			if (isset($args)) {
282			$this->merge_args($args);
283			}
284			}
285
286			$this->build();
287			//$this->check();
288			}
289
290			function merge_args(&$args) {
291
292			//print "args: " . Dumper($args);
293
294			// check if passed in locator is already of type me ...
295			// ... if so, merge it into current instance
296			if (is_object($args) && get_class($args) == get_class($this)) {
297			$this->merge_to($this, $args);
298
299			} else {
300
301			// FIXME: handle locator merging here?
302			//$this->_arguments = &$args;
303
304			// FIXME: to php::merge_to($this, $locator) here!!!
305			//$this->_data
306			// for now: assume plain hash, so just iterate and overwrite!
307			$this->merge_to($this, $args, '_');
308
309			}
310			}
311
312			function merge_to(&$target, $source, $prefix_key = '') {
313
314			//print "target: " . Dumper($target);
315			//print "source: " . Dumper($source);
316
317			// pre-flight checks
318			if (!isset($target)) {
319			user_error("variable passed as reference (merge target) is not set.");
320			return;
321			}
322			//if (!is_hash($hash)) {
323			if (!isset($source)) {
324			user_error("variable passed as source is not set.");
325			return;
326			}
327
328			// perform merge
329			foreach ($source as $key => $val) {
330			$name = $prefix_key . $key;
331			if (is_object($target)) {
332			$target->$name = $val;
333			//} elseif (php::is_hash($target)) {
334			} else {
335			$target[$name] = $val;
336			}
337			}
338
339			// indicate good
340			return 1;
341
342			}
343
344			/**
345			* Set the locator metadata hash we will feed partly
346	joko	1.6	* to an encapsulated Data::Driver::Proxy instance
347	joko	1.1	*
348			* @param LocatorMetadataHash array -
349			*
350			*/
351			function set( &$locator ) {
352			$this->_out = &$locator;
353			}
354
355			function &get_metadata() {
356			//return ($this->_out);
357			return $this->_metadata;
358			}
359
360
361			function build( ) {
362
363			// trace
364			//print Dumper($this);
365
366			$good = 0;
367			switch ($this->_datasource_type) {
368			case 'rpc':
369			// get rpc connection information from global constants
370			$metadata = array(
371			//package => 'Data::Driver::Proxy',
372			//package => 'DataSource::Proxy::XMLRPC',
373	joko	1.3	//package => 'DataSource::Generic',
374	joko	1.1	//package => 'DesignPattern::RemoteProxy',
375			Host => RPC_HOSTNAME,
376			Port => RPC_PORT,
377			);
378			$good = 1;
379			break;
380			}
381
382			if ($good) {
383
384			// V1:
385			/*
386			$this->_out = array(
387			datasource_type => $datasource,
388			adapter_type => 'Data',
389			metadata => $metadata,
390			);
391			*/
392
393			// V2:
394			//$this->_out = $metadata;
395
396			// V3:
397			$this->merge_to($this->_metadata, $metadata);
398
399			}
400
401			// trace
402			//print Dumper($this);
403
404			}
405
406			function check() {
407			if (!sizeof($this->_metadata)) {
408			user_error("DataSource::Locator::check() failed: " . "Locator metadata not established, please check configuration options.");
409			return;
410			}
411			return 1;
412			}
413
414
415			}
416
417			?>
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