1:   2:   3:   4:   5:   6:   7:   8:   9:  10:  11:  12:  13:  14:  15:  16:  17:  18:  19:  20:  21:  22:  23:  24:  25:  26:  27:  28:  29:  30:  31:  32:  33:  34:  35:  36:  37:  38:  39:  40:  41:  42:  43:  44:  45:  46:  47:  48:  49:  50:  51:  52:  53:  54:  55:  56:  57:  58:  59:  60:  61:  62:  63:  64:  65:  66:  67:  68:  69:  70:  71:  72:  73:  74:  75:  76:  77:  78:  79:  80:  81:  82:  83:  84:  85:  86:  87:  88:  89:  90:  91:  92:  93:  94:  95:  96:  97:  98:  99: 100: 

<?php
    /** CzProject Innu DB
     * 
     * @author      Jan Pecha, <janpecha@email.cz>
     */
    
    namespace Cz\InnuDb;
    
    class InnuDb
    {
        /** @var  string */
        private $path;
        
        /** @var  array */
        private $data;
        
        /** @var  bool @internal */
        private $dataLoaded = FALSE;
        
        /** @var  Loader */
        private $loader;
        
        
        
        /**
         * @param   Loader
         * @param   string
         * @throws  InnuDbException
         */
        public function __construct(Loader $loader, $path)
        {
            $this->loader = $loader;
            $this->path = realpath($path);
            
            if($this->path === FALSE)
            {
                throw new InnuDbException("Data file not found in $path");
            }
        }
        
        
        
        /**
         * @return  string
         */
        public function getPath()
        {
            return $this->path;
        }
        
        
        
        /**
         * @return  mixed
         */
        public function getData()
        {
            if(!$this->dataLoaded)
            {
                $this->data = (array) $this->loader->load($this->path);
                $this->dataLoaded = TRUE;
            }
            
            return $this->data;
        }
        
        
        
        /**
         * @param   string|NULL
         * @return  Collection
         * @throws  InnuDbException
         */
        public function createCollection($subset = NULL)
        {
            $data = $this->getData();
            
            if($subset !== NULL)
            {
                if(!isset($data[$subset]))
                {
                    throw new InnuDbException("Collection: data subset '$subset' missing.");
                }
                
                $data = $data[$subset];
            }
            
            $collection = new Collection($data);
            
            return $collection;
        }
    }
    
    
    
    class InnuDbException extends \RuntimeException
    {
    }