1 <?php

     2 

     3 namespace CorpusParole\Http\Controllers\Api;

     4 

     5 // use Illuminate\Http\Request;

     6 // use CorpusParole\Http\Requests;

     7 use CorpusParole\Http\Controllers\Controller;

     8 

     9 use Illuminate\Http\Request;

    10 use EasyRdf\Resource;

    11 use EasyRdf\Literal;

    12 

    13 use CorpusParole\Libraries\Sparql\SparqlClient;

    14 use CorpusParole\Services\LexvoResolverInterface;

    15 use CorpusParole\Services\BnfResolverInterface;

    16 

    17 

    18 class ThemeController extends Controller

    19 {

    20     private $sparqlClient = null;

    21 

    22     public function __construct(SparqlClient $sparqlClient, LexvoResolverInterface $lexvoResolver, BnfResolverInterface $bnfResolver) {

    23         $this->sparqlClient = $sparqlClient;

    24         $this->lexvoResolver = $lexvoResolver;

    25         $this->bnfResolver = $bnfResolver;

    26     }

    27 

    28     /**

    29      * Display the specified resource.

    30      *

    31      * @return \Illuminate\Http\Response

    32      */

    33     public function index(Request $request)

    34     {

    35         $filter = $request->input('filter', 'bnf');

    36         $resolve = filter_var($request->input('resolve', true), FILTER_VALIDATE_BOOLEAN);

    37 

    38         $filterClause = "";

    39 

    40         if($filter === 'bnf') {

    41             $filterClause = "FILTER (isIRI(?o) && regex(str(?o), '^".config('corpusparole.bnf_ark_base_url')."')) .";

    42         }

    43         elseif($filter === 'uri') {

    44             $filterClause = "FILTER isIRI(?o) .";

    45         }

    46         elseif($filter === 'all' || $filter === 'none' || $filter === '') {

    47             $filterClause = "";

    48         }

    49         else {

    50             abort(401,"Value for filter parameter must be in 'bnf', 'uri', 'all' or 'none'");

    51         }

    52 

    53         $query =  preg_replace('/\s+/', ' ',

    54          "select (?o as ?theme) (COUNT(?s) as ?count) where {

    55             ?s a <http://www.europeana.eu/schemas/edm/ProvidedCHO> .

    56             ?s <http://purl.org/dc/elements/1.1/subject> ?o .

    57             $filterClause

    58           }

    59           GROUP BY ?o

    60           ORDER BY DESC(?count)");

    61 

    62         $docs = $this->sparqlClient->query($query);

    63 

    64         $themes = [];

    65         $labels = [];

    66 

    67         $bnfUris = [];

    68         $lexvoUris = [];

    69 

    70         foreach ($docs as $row) {

    71             $key = "";

    72             $label = null;

    73             if($row->theme instanceof Resource) {

    74                 $key = $row->theme->getUri();

    75                 if($resolve && strpos($key, config('corpusparole.bnf_ark_base_url')) === 0) {

    76                     array_push($bnfUris, $key);

    77                 }

    78                 elseif($resolve && strpos($key, config('corpusparole.lexvo_base_url')) === 0) {

    79                     array_push($lexvoUris, $key);

    80                 }

    81                 $label = null;

    82             }

    83             elseif($row->theme instanceof Literal) {

    84                 $key = $row->theme->getValue();

    85                 $label = $row->theme->getValue();

    86             }

    87 

    88             $themes[$key] = [

    89                 "label" => $label,

    90                 "count" => $row->count->getValue()

    91             ];

    92         }

    93 

    94         if($resolve) {

    95             if(count($lexvoUris) > 0) {

    96                 $labels = $this->lexvoResolver->getNames($lexvoUris);

    97             }

    98             if(count($bnfUris) > 0) {

    99                 $labels = array_merge($labels, $this->bnfResolver->getLabels($bnfUris));

   100             }

   101             foreach ($themes as $themeKey => $themeDef) {

   102                 if(array_key_exists($themeKey, $labels)) {

   103                     $themeDef['label'] = $labels[$themeKey];

   104                 }

   105                 $themes[$themeKey] = $themeDef;

   106             }

   107         }

   108 

   109         return response()->json(['themes' => $themes ]);

   110 

   111     }

   112 

   113 }