library/classes/rulesets/library/RsPopulation.php

   1 <?php
   2 // Copyright (C) 2011 Ken Chapple <ken@mi-squared.com>
   3 //
   4 // This program is free software; you can redistribute it and/or
   5 // modify it under the terms of the GNU General Public License
   6 // as published by the Free Software Foundation; either version 2
   7 // of the License, or (at your option) any later version.
   8 //
   9 require_once("RsPatient.php");
  10 /*      Defines a population of patients
  11  *
  12  */
  13 class RsPopulation implements Countable, Iterator, ArrayAccess
  14 {
  15     protected $_patients = array();
  16
  17     /*
  18      * initialize the patient population
  19      */
  20     public function __construct(array $patientIdArray)
  21     {
  22         foreach ($patientIdArray as $patientId) {
  23             $this->_patients[]= new RsPatient($patientId);
  24         }
  25     }
  26
  27     /*
  28      * Countable Interface
  29      */
  30     public function count()
  31     {
  32         return count($this->_patients);
  33     }
  34
  35     /*
  36      * Iterator Interface
  37      */
  38     public function rewind()
  39     {
  40         reset($this->_patients);
  41     }
  42
  43     public function current()
  44     {
  45         return current($this->_patients);
  46     }
  47
  48     public function key()
  49     {
  50         return key($this->_patients);
  51     }
  52
  53     public function next()
  54     {
  55         return next($this->_patients);
  56     }
  57
  58     public function valid()
  59     {
  60         return $this->current() !== false;
  61     }
  62
  63
  64     /*
  65      * ArrayAccess Interface
  66      */
  67     public function offsetSet($offset, $value)
  68     {
  69         if ($value instanceof CqmPatient) {
  70             if ($offset == "") {
  71                 $this->_patients[] = $value;
  72             } else {
  73                 $this->_patients[$offset] = $value;
  74             }
  75         } else {
  76             throw new Exception("Value must be an instance of RsPatient");
  77         }
  78     }
  79
  80     public function offsetExists($offset)
  81     {
  82         return isset($this->_patients[$offset]);
  83     }
  84
  85     public function offsetUnset($offset)
  86     {
  87         unset($this->_patients[$offset]);
  88     }
  89
  90     public function offsetGet($offset)
  91     {
  92         return isset($this->_patients[$offset]) ? $this->container[$offset] : null;
  93     }
  94 }