phphtmllib/drivers/MemoryDataSource.php

<?php
/**
 * This file contains the MemoryDataSource child class
 * that inherits from the DataListSource.
 *
 * @author Sebastian Utz <seut@tunemedia.de>
 * @author Andreas Motl <andreas.motl@ilo.de>
 * @copyright (c) 2003 - All Rights reserved.
 * @license GNU LGPL (GNU Lesser General Public License)
 *
 * @author-url http://www.netfrag.org/~jonen/
 * @author-url http://www.netfrag.org/~joko/
 * @license-url http://www.gnu.org/licenses/lgpl.txt
 *
 * @package phpHtmlLib
 * @module widgets::data_source::MemoryDataSource
 *
 */

/**
 * $Id: MemoryDataSource.php,v 1.2 2003/03/28 02:59:07 joko Exp $
 *
 * $Log: MemoryDataSource.php,v $
 * Revision 1.2  2003/03/28 02:59:07  joko
 * minor fix: prevent php-error if result is empty
 *
 * Revision 1.1  2003/03/27 01:10:57  jonen
 * + moved from com.newsblob.phphtmllib tree(was MemoryDataListSource.inc)
 *
 * Revision 1.3  2003/03/05 10:57:10  joko
 * established here (again?)
 *
 * Revision 1.3  2003/03/03 21:24:45  joko
 * updated todo
 *
 * Revision 1.2  2003/03/01 15:34:26  joko
 * + introduced new 'label'-mechanism, purged old 'header'-mechanism
 * + reworked internal data-structure and introduced new methods 'propagate_xyz'
 * + added little debugging helper methods
 *
 * Revision 1.1  2003/03/01 03:09:22  joko
 * + moved here from data_list/MemoryDataListSource.inc
 *
 *
 * Revision 1.1  2003/02/28 17:17:59  jonen
 * + renamed from flibRPCDataListSource.inc
 *
 * Revision 1.0  2003/02/xx 00:00:00  jonen
 * + copied from CSVFILEDataListSource.inc
 *
 */

/**
 * MemoryDataSource provides a basic framework for handling 
 * arbitrary data, that is: items, lists and trees.
 * It assumes the "list" being *not* the most abstract, but the most 
 * multipurpose thing to be able to represent/handle all the others.
 *    (regarding convenience and code-reuse: inherits from DataListSource)
 *
 * This could be pictured by looking at a list being either
 * a part (tree) or a container (item) of another thing.
 * e.g.:
 *  item = part of list   (a item is a part of a list)
 *  list = list   (a list is a list)
 *  tree = nested lists   (a part of a tree is a list)
 * 
 * In fact, MemoryDataSource just doesn't care a bit  
 * about the type of the actual data, so perfectly fits 
 * as an abstract base for further hackings.
 * e.g.: look at ProxyDataSource.inc .....
 *
 */

/**
 * Todo:
 *
 *  o introduce (g|s)etlabels to set either 
 *     a) columns (for list columns) or 
 *     b) captions (for object attributes)
 *  o maybe use shared memory as an alternative handler
 *     look at the php Shared Memory extension at (e.g.):
 *     http://www.zend.com/manual/ref.shmop.php
 *
 */


//   !!!!!   THIS HAS TO BE BROKEN AS WELL  !!!!!
// !!!! compare DataSource::GenericDataSource !!!!
//  !!!! has to be independent of DataListSource !!!!
//
// comment: this is not required and, i guess, not clear possible here,
// but I feel very sad about all the BIG BROKEN THINGS happpens in our days, PEACES to erveryone!
// March 26th, 2003, jonen.


//class MemoryDataSource extends DataListSource {
class MemoryDataSource extends DataListSource {

// it's free now!
//class MemoryDataSource {

// not yet!  ;-)


        /**
         * These hold data
         *
         */
        var $_memory = array();
        var $_result = array();

        /**
         * this holds the headers read
         * array keys
         */
        var $_data_keys = array();

        /**
         * This holds metadata
         *
         */
        var $_schema = array();
         
        /**
         * This holds some information about the tracing level.
         *
         */
        var $_debug = array(
          notice => 0,
          trace => 0,
          payload => 0,
        );

        /**
         * This accumulates errors occouring while processing.
         * $error = array($level, $message);
         *
         */
        var $_errors = array();


        /**
         * The constructor.
         *
         * @param hash - a hashed data object
         *
         */
        function MemoryDataSource( &$payload ) {

      // tracing
        $this->trace_payload('MemoryDataSource', $payload);

      // transfer data to "memory"
        $this->_memory = &$payload;

        }

  function read_labels_from_result() {
    $this->set_labels($this->_result[0]);
    $this->propagate_schema();
  }

  function debug($method, $message) {
    if ($this->_debug[notice]) {
      if ($method) { $prefix = get_class($this) . "->" . $method . ": "; }
      print $prefix . $message . "<br/>" . "\n";
    }
  }

  function trace($method, $var) {
    if ($this->_debug[trace]) {
      print get_class($this) . "->" . $method . ": " . Dumper($var) . "<br/>" . "\n";
    }
  }

  function trace_payload($method, $data) {
    if ($this->_debug[payload]) {
      $this->trace($method, $data);
    }
  }

        /**
         * The prequery.  We use this to read the file
         * into memory so we can do operations on the data
         * (search, sort, etc.)
         */
        function O_do_prequery() {
                $this->_read_schema();
        }
        function O_do_prequery() {
   }
  
        /**
         * This function does the query
         * and search/sort
         */
        function do_query() {
                // short-circuit (default behaviour, maybe intercepted by inheriting and overwriting 'do_query')
                $this->_result = $this->_memory;
                $this->handle_result();
        }

        function handle_result() {
          $this->debug("handle_result", "HANDLE RESULT!<br>");
       $this->propagate_result();
    }

    function propagate_result() {
      $this->debug('propagate_result', "PROPAGATE RESULT!");
      
      $count = 0;
      if (is_array($this->_result)) {
        foreach ($this->_result as $value) {
          $this->trace_payload("propagate_result", $value);
          if ($this->add_data_row($value)) {
            $count++;
          }
        }
      }
      
      $this->set_total_rows( $count );
      $this->sort();
      
    }

        /**
         * This function returns the next row of 
         * valid data.  
         *
         */
        function get_next_data_row() {
          
          //print "get_row!<br/>";
          
          //print Dumper($this->_proxy->_result);
          
                $index = $this->get_data_index();
                $limit = $this->get_limit();
                $offset = $this->get_offset();

                if ($limit == -1) {
                        //don't limit the data
                        if ($index > $this->get_total_rows()) {
                                return NULL;
                        } else {
                                return $this->_data[$index];
                        }
                } else {
                        $left_to_show = $limit - ($index - $offset);
                        if ($left_to_show > 0) {
                                return $this->_data[$index];
                        } else {
                                return NULL;
                        }
                }
        }


        /**
         * This file trys to get the Object Hash Keys.
         *
         */
        function propagate_schema() {
          $this->debug("propagate_schema", "PROPAGATE SCHEMA!<br>");
                  /*
                  // FIXME: patch to make php not croak if result is empty at this stage
                  if (!is_array($this->_memory[0])) { 
                        //$this->add_data_row( array( 'empty' => '[empty]') );
                        //$this->_memory[0] = array( '' => 'empty' );
                        $this->_errors[] = array("warning", "header metadata was empty");
                        print "no header!<br/>";
                        return;
                        }
*/

    if (!is_array($this->_schema[labels] )) {
      logp(get_class($this) . "->propagate_schema: No schema data could be read from result.", PEAR_LOG_WARNING);
      return;
    }

                  foreach($this->_schema[labels] as $value) {
                      $this->debug("propagate_schema", "label: $value");
                                array_push($this->_data_keys, $value);
                        }             
        }


  function O_get_header() {
    $this->_read_schema();
    return $this->_data_keys;
  }             

  function get_labels() {
    return $this->_data_keys;
  }             

  function set_labels($labels_or_entry) {
    if (php::is_hash($labels_or_entry)) {
      if ($this->_debug[notice]) {
        $this->debug('set_labels', 'hash was passed in (is_hash == true): just using keys');
      }
      $labels_or_entry = array_keys($labels_or_entry);
    }
    $this->trace('set_labels', $labels_or_entry);
    $this->_schema[labels] = $labels_or_entry;
  }

  /*
  function get_data_source() {
    
  }
  */


        /**
         * This function adds a row of data
         * if necesarry to the data array
         *
         */
        function add_data_row($row) {
          
          //print "add_row!<br/>";
          
                if ($row != NULL) {
                        if ($this->get_searchby_value()) {
                                //user wants to search the data
                                if ($this->_find_data($row) ) {
                                        $this->_data[] = $row;
                                        return TRUE;
                                } else {
                                        return FALSE;
                                }
                        } else {
                                $this->_data[] = $row;
                                return TRUE;
                        }
                } else {
                        return FALSE;
                }
        }

        function sort() {
                $sortby = $this->get_orderby();
                //ok we need to sort the data by the
                //column in the table
                if ($this->_is_column_sortable($sortby)) {
                        //looks like we can sort this column
                        usort($this->_data, array($this, "cmp"));
                }
        }

        function cmp($data1, $data2) {
                $sortby = $this->get_orderby();
                $ret = strnatcmp( $data1[$sortby], $data2[$sortby]);
                if ($this->get_reverseorder() == "true") {
                        $ret *= -1;
                }
                return $ret;
        }

        function _find_data( $row_data ) {
                //look for the 'needle' in the 'haystack'

                $needle = $this->get_searchby_value();
                $haystack = $row_data[$this->get_searchby()];

                switch ($this->get_simplesearch_modifier()) {
                case "BEGINS":
                        if (strncasecmp($needle, $haystack, strlen($needle)) == 0) {
                                return TRUE;
                        } else {
                                return FALSE;
                        }
                        break;

                case "CONTAINS":
                        if (stristr($haystack, $needle)) {
                                return TRUE;
                        } else {
                                return FALSE;
                        }
                        break;
                case "EXACT":
                        if (strcasecmp($needle, $haystack) == 0) {
                                return TRUE;
                        } else {
                                return FALSE;
                        }
                        break;
                case "ENDS":
                        $needle_len = strlen( $needle );
                        $haystack_len = strlen( $haystack );
                        if ($needle_len > $haystack_len) {
                                return FALSE;
                        } else if ($needle_len == $haystack_len) {
                                $tmp = $haystack;
                        } else {
                                $tmp = substr($haystack, $haystack_len - $needle_len);
                        }
                        if (strncasecmp($needle, $tmp, $needle_len) == 0) {
                                return TRUE;
                        } else {
                                return FALSE;
                        }
                        break;
                }
        }
        
}
?>
1	jonen	1.1	<?php
2			/**
3			* This file contains the MemoryDataSource child class
4			* that inherits from the DataListSource.
5			*
6			* @author Sebastian Utz <seut@tunemedia.de>
7			* @author Andreas Motl <andreas.motl@ilo.de>
8			* @copyright (c) 2003 - All Rights reserved.
9			* @license GNU LGPL (GNU Lesser General Public License)
10			*
11			* @author-url http://www.netfrag.org/~jonen/
12			* @author-url http://www.netfrag.org/~joko/
13			* @license-url http://www.gnu.org/licenses/lgpl.txt
14			*
15			* @package phpHtmlLib
16			* @module widgets::data_source::MemoryDataSource
17			*
18			*/
19
20			/**
21	joko	1.3	* $Id: MemoryDataSource.php,v 1.2 2003/03/28 02:59:07 joko Exp $
22	joko	1.2	*
23			* $Log: MemoryDataSource.php,v $
24	joko	1.3	* Revision 1.2 2003/03/28 02:59:07 joko
25			* minor fix: prevent php-error if result is empty
26			*
27	joko	1.2	* Revision 1.1 2003/03/27 01:10:57 jonen
28			* + moved from com.newsblob.phphtmllib tree(was MemoryDataListSource.inc)
29	jonen	1.1	*
30			* Revision 1.3 2003/03/05 10:57:10 joko
31			* established here (again?)
32			*
33			* Revision 1.3 2003/03/03 21:24:45 joko
34			* updated todo
35			*
36			* Revision 1.2 2003/03/01 15:34:26 joko
37			* + introduced new 'label'-mechanism, purged old 'header'-mechanism
38			* + reworked internal data-structure and introduced new methods 'propagate_xyz'
39			* + added little debugging helper methods
40			*
41			* Revision 1.1 2003/03/01 03:09:22 joko
42			* + moved here from data_list/MemoryDataListSource.inc
43			*
44			*
45			* Revision 1.1 2003/02/28 17:17:59 jonen
46			* + renamed from flibRPCDataListSource.inc
47			*
48			* Revision 1.0 2003/02/xx 00:00:00 jonen
49			* + copied from CSVFILEDataListSource.inc
50			*
51			*/
52
53			/**
54			* MemoryDataSource provides a basic framework for handling
55			* arbitrary data, that is: items, lists and trees.
56			* It assumes the "list" being not the most abstract, but the most
57			* multipurpose thing to be able to represent/handle all the others.
58			* (regarding convenience and code-reuse: inherits from DataListSource)
59			*
60			* This could be pictured by looking at a list being either
61			* a part (tree) or a container (item) of another thing.
62			* e.g.:
63			* item = part of list (a item is a part of a list)
64			* list = list (a list is a list)
65			* tree = nested lists (a part of a tree is a list)
66			*
67			* In fact, MemoryDataSource just doesn't care a bit
68			* about the type of the actual data, so perfectly fits
69			* as an abstract base for further hackings.
70			* e.g.: look at ProxyDataSource.inc .....
71			*
72			*/
73
74			/**
75			* Todo:
76			*
77			* o introduce (g\|s)etlabels to set either
78			* a) columns (for list columns) or
79			* b) captions (for object attributes)
80			* o maybe use shared memory as an alternative handler
81			* look at the php Shared Memory extension at (e.g.):
82			* http://www.zend.com/manual/ref.shmop.php
83			*
84			*/
85
86
87
88			// !!!!! THIS HAS TO BE BROKEN AS WELL !!!!!
89			// !!!! compare DataSource::GenericDataSource !!!!
90			// !!!! has to be independent of DataListSource !!!!
91			//
92			// comment: this is not required and, i guess, not clear possible here,
93			// but I feel very sad about all the BIG BROKEN THINGS happpens in our days, PEACES to erveryone!
94			// March 26th, 2003, jonen.
95
96
97			//class MemoryDataSource extends DataListSource {
98			class MemoryDataSource extends DataListSource {
99
100			// it's free now!
101	joko	1.3	//class MemoryDataSource {
102
103			// not yet! ;-)
104	jonen	1.1
105
106			/**
107			* These hold data
108			*
109			*/
110			var $_memory = array();
111			var $_result = array();
112
113			/**
114			* this holds the headers read
115			* array keys
116			*/
117			var $_data_keys = array();
118
119			/**
120			* This holds metadata
121			*
122			*/
123			var $_schema = array();
124
125			/**
126			* This holds some information about the tracing level.
127			*
128			*/
129			var $_debug = array(
130			notice => 0,
131			trace => 0,
132			payload => 0,
133			);
134
135			/**
136			* This accumulates errors occouring while processing.
137			* $error = array($level, $message);
138			*
139			*/
140			var $_errors = array();
141
142
143
144			/**
145			* The constructor.
146			*
147			* @param hash - a hashed data object
148			*
149			*/
150			function MemoryDataSource( &$payload ) {
151
152			// tracing
153			$this->trace_payload('MemoryDataSource', $payload);
154
155			// transfer data to "memory"
156			$this->_memory = &$payload;
157
158			}
159
160			function read_labels_from_result() {
161			$this->set_labels($this->_result[0]);
162			$this->propagate_schema();
163			}
164
165			function debug($method, $message) {
166			if ($this->_debug[notice]) {
167			if ($method) { $prefix = get_class($this) . "->" . $method . ": "; }
168			print $prefix . $message . "<br/>" . "\n";
169			}
170			}
171
172			function trace($method, $var) {
173			if ($this->_debug[trace]) {
174			print get_class($this) . "->" . $method . ": " . Dumper($var) . "<br/>" . "\n";
175			}
176			}
177
178			function trace_payload($method, $data) {
179			if ($this->_debug[payload]) {
180			$this->trace($method, $data);
181			}
182			}
183
184			/**
185			* The prequery. We use this to read the file
186			* into memory so we can do operations on the data
187			* (search, sort, etc.)
188			*/
189			function O_do_prequery() {
190			$this->_read_schema();
191			}
192			function O_do_prequery() {
193			}
194
195			/**
196			* This function does the query
197			* and search/sort
198			*/
199			function do_query() {
200			// short-circuit (default behaviour, maybe intercepted by inheriting and overwriting 'do_query')
201			$this->_result = $this->_memory;
202			$this->handle_result();
203			}
204
205			function handle_result() {
206			$this->debug("handle_result", "HANDLE RESULT!<br>");
207			$this->propagate_result();
208			}
209
210	joko	1.2	function propagate_result() {
211			$this->debug('propagate_result', "PROPAGATE RESULT!");
212
213			$count = 0;
214			if (is_array($this->_result)) {
215			foreach ($this->_result as $value) {
216	jonen	1.1	$this->trace_payload("propagate_result", $value);
217	joko	1.2	if ($this->add_data_row($value)) {
218			$count++;
219			}
220			}
221			}
222
223			$this->set_total_rows( $count );
224			$this->sort();
225
226	jonen	1.1	}
227
228			/**
229			* This function returns the next row of
230			* valid data.
231			*
232			*/
233			function get_next_data_row() {
234
235			//print "get_row!<br/>";
236
237			//print Dumper($this->_proxy->_result);
238
239			$index = $this->get_data_index();
240			$limit = $this->get_limit();
241			$offset = $this->get_offset();
242
243			if ($limit == -1) {
244			//don't limit the data
245			if ($index > $this->get_total_rows()) {
246			return NULL;
247			} else {
248			return $this->_data[$index];
249			}
250			} else {
251			$left_to_show = $limit - ($index - $offset);
252			if ($left_to_show > 0) {
253			return $this->_data[$index];
254			} else {
255			return NULL;
256			}
257			}
258			}
259
260
261
262
263			/**
264			* This file trys to get the Object Hash Keys.
265			*
266			*/
267			function propagate_schema() {
268			$this->debug("propagate_schema", "PROPAGATE SCHEMA!<br>");
269			/*
270			// FIXME: patch to make php not croak if result is empty at this stage
271			if (!is_array($this->_memory[0])) {
272			//$this->add_data_row( array( 'empty' => '[empty]') );
273			//$this->_memory[0] = array( '' => 'empty' );
274			$this->_errors[] = array("warning", "header metadata was empty");
275			print "no header!<br/>";
276			return;
277			}
278			*/
279	joko	1.2
280			if (!is_array($this->_schema[labels] )) {
281			logp(get_class($this) . "->propagate_schema: No schema data could be read from result.", PEAR_LOG_WARNING);
282			return;
283			}
284
285	jonen	1.1	foreach($this->_schema[labels] as $value) {
286			$this->debug("propagate_schema", "label: $value");
287			array_push($this->_data_keys, $value);
288			}
289			}
290
291
292			function O_get_header() {
293			$this->_read_schema();
294			return $this->_data_keys;
295			}
296
297			function get_labels() {
298			return $this->_data_keys;
299			}
300
301			function set_labels($labels_or_entry) {
302			if (php::is_hash($labels_or_entry)) {
303			if ($this->_debug[notice]) {
304			$this->debug('set_labels', 'hash was passed in (is_hash == true): just using keys');
305			}
306			$labels_or_entry = array_keys($labels_or_entry);
307			}
308			$this->trace('set_labels', $labels_or_entry);
309			$this->_schema[labels] = $labels_or_entry;
310			}
311
312			/*
313			function get_data_source() {
314
315			}
316			*/
317
318
319			/**
320			* This function adds a row of data
321			* if necesarry to the data array
322			*
323			*/
324			function add_data_row($row) {
325
326			//print "add_row!<br/>";
327
328			if ($row != NULL) {
329			if ($this->get_searchby_value()) {
330			//user wants to search the data
331			if ($this->_find_data($row) ) {
332			$this->_data[] = $row;
333			return TRUE;
334			} else {
335			return FALSE;
336			}
337			} else {
338			$this->_data[] = $row;
339			return TRUE;
340			}
341			} else {
342			return FALSE;
343			}
344			}
345
346			function sort() {
347			$sortby = $this->get_orderby();
348			//ok we need to sort the data by the
349			//column in the table
350			if ($this->_is_column_sortable($sortby)) {
351			//looks like we can sort this column
352			usort($this->_data, array($this, "cmp"));
353			}
354			}
355
356			function cmp($data1, $data2) {
357			$sortby = $this->get_orderby();
358			$ret = strnatcmp( $data1[$sortby], $data2[$sortby]);
359			if ($this->get_reverseorder() == "true") {
360			$ret *= -1;
361			}
362			return $ret;
363			}
364
365			function _find_data( $row_data ) {
366			//look for the 'needle' in the 'haystack'
367
368			$needle = $this->get_searchby_value();
369			$haystack = $row_data[$this->get_searchby()];
370
371			switch ($this->get_simplesearch_modifier()) {
372			case "BEGINS":
373			if (strncasecmp($needle, $haystack, strlen($needle)) == 0) {
374			return TRUE;
375			} else {
376			return FALSE;
377			}
378			break;
379
380			case "CONTAINS":
381			if (stristr($haystack, $needle)) {
382			return TRUE;
383			} else {
384			return FALSE;
385			}
386			break;
387			case "EXACT":
388			if (strcasecmp($needle, $haystack) == 0) {
389			return TRUE;
390			} else {
391			return FALSE;
392			}
393			break;
394			case "ENDS":
395			$needle_len = strlen( $needle );
396			$haystack_len = strlen( $haystack );
397			if ($needle_len > $haystack_len) {
398			return FALSE;
399			} else if ($needle_len == $haystack_len) {
400			$tmp = $haystack;
401			} else {
402			$tmp = substr($haystack, $haystack_len - $needle_len);
403			}
404			if (strncasecmp($needle, $tmp, $needle_len) == 0) {
405			return TRUE;
406			} else {
407			return FALSE;
408			}
409			break;
410			}
411			}
412
413			}
414			?>
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