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   1  <?php
   2  
   3  namespace RESTful;
   4  
   5  class Pagination implements \IteratorAggregate, \ArrayAccess
   6  {
   7      public $resource,
   8          $uri;
   9  
  10      protected $_page,
  11          $_offset = 0,
  12          $_size = 25;
  13  
  14      public function __construct($resource, $uri, $data = null)
  15      {
  16          $this->resource = $resource;
  17          $this->uri = $uri;
  18          if ($data != null) {
  19              $this->_page = new Page($resource, $uri, $data);
  20          } else {
  21              $this->_page = null;
  22          }
  23      }
  24  
  25      protected function _getPage($offset = null)
  26      {
  27          if ($this->_page == null) {
  28              $this->_offset = ($offset == null) ? 0 : $offset * $this->_size;
  29              $uri = $this->_buildUri();
  30              $this->_page = new Page($this->resource, $uri);
  31          } elseif ($offset != null) {
  32              $offset = $offset * $this->_size;
  33              if ($offset != $this->_offset) {
  34                  $this->_offset = $offset;
  35                  $uri = $this->_buildUri();
  36                  $this->_page = new Page($this->resource, $uri);
  37              }
  38          }
  39  
  40          return $this->_page;
  41      }
  42  
  43      public function total()
  44      {
  45          return floor($this->_getPage()->total / $this->_size);
  46      }
  47  
  48      protected function _buildUri($offset = null)
  49      {
  50          # TODO: hacky but works for now
  51          $offset = ($offset == null) ? $this->_offset : $offset;
  52          if (strpos($this->uri, '?') === false) {
  53              $uri = $this->uri . '?';
  54          } else {
  55              $uri = $this->uri . '&';
  56          }
  57          $uri = $uri . 'offset=' . strval($offset);
  58  
  59          return $uri;
  60      }
  61  
  62      // IteratorAggregate
  63      public function getIterator()
  64      {
  65          $uri = $this->_buildUri($offset = 0);
  66  
  67          return new PaginationIterator($this->resource, $uri);
  68      }
  69  
  70      // ArrayAccess
  71      public function offsetSet($offset, $value)
  72      {
  73          throw new \BadMethodCallException(get_class($this) . ' array access is read-only');
  74      }
  75  
  76      public function offsetExists($offset)
  77      {
  78          return (0 <= $offset && $offset < $this->total());
  79      }
  80  
  81      public function offsetUnset($offset)
  82      {
  83          throw new \BadMethodCallException(get_class($this) . ' array access is read-only');
  84      }
  85  
  86      public function offsetGet($offset)
  87      {
  88          return $this->_getPage($offset);
  89      }
  90  }