--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/server/src/app/Models/DocumentBase.php	Sat Aug 06 21:27:53 2016 +0700
@@ -0,0 +1,203 @@
+<?php
+namespace CorpusParole\Models;
+
+use Config;
+use CorpusParole\Libraries\Utils;
+use CorpusParole\Libraries\CocoonUtils;
+use CorpusParole\Libraries\RdfModel\RdfModelResource;
+use JsonSerializable;
+use Log;
+use EasyRdf\Literal;
+use EasyRdf\Resource;
+use EasyRdf\Graph;
+
+
+/**
+ */
+class DocumentBase extends RdfModelResource implements JsonSerializable {
+
+    public function __construct($uri, $graph = null) {
+        //print($graph->dump('html'));
+        parent::__construct($uri, $graph);
+    }
+
+    private $id = null;
+
+    // memoization
+    private $providedCHO = null;
+    private $title = false;
+    private $lang = null;
+    private $langResolved = null;
+    private $issued = null;
+    private $modified = null;
+
+
+    public function getProvidedCHO() {
+        if(is_null($this->providedCHO)) {
+            $this->providedCHO = $this->get("<http://www.europeana.eu/schemas/edm/aggregatedCHO>");
+        }
+        return $this->providedCHO;
+    }
+
+    protected function clearMemoizationCache() {
+        $this->providedCHO = null;
+        $this->title = false;
+        $this->lang = null;
+        $this->langResolved = null;
+        $this->issued = null;
+        $this->modified = null;
+    }
+
+    public function getId() {
+        if(is_null($this->id)) {
+            $ids = $this->getProvidedCHO()->all('<http://purl.org/dc/elements/1.1/identifier>');
+            foreach ($ids as $id) {
+                if($id instanceof Literal && strpos($id->getValue(), config('corpusparole.corpus_id_scheme')) === 0) {
+                    $this->id = $id->getValue();
+                }
+            }
+            if(is_null($this->id)) {
+                $this->id = CocoonUtils::getIdFromCorpusUri($this->uri);
+            }
+        }
+        return $this->id;
+    }
+
+    public function getLanguage() {
+        if(is_null($this->lang)) {
+            try {
+                $langs = $this->getProvidedCHO()->all('<http://purl.org/dc/elements/1.1/language>');
+                if(count($langs) > 0) {
+                    $this->lang = $langs[0];
+                }
+            } catch(\Exception $e) {
+                $this->lang = null;
+            }
+        }
+        return $this->lang;
+    }
+
+    public function getLanguageValue() {
+        $lang = $this->getLanguage();
+        if($lang instanceof Resource) {
+            return $lang->getUri();
+        } else if($lang instanceof Literal) {
+            return $lang->getValue();
+        }
+        return null;
+    }
+
+    public function getLanguageResolved() {
+        return $this->langResolved;
+    }
+
+    public function setLanguageResolved($languageResolved) {
+        $this->langResolved = $languageResolved;
+    }
+
+
+    public function getTitle() {
+        if($this->title === false) {
+            try {
+                $this->title = $this->getProvidedCHO()->getLiteral('<http://purl.org/dc/elements/1.1/title>');
+            } catch(\Exception $e) {
+                $this->title = null;
+            }
+        }
+        return $this->title;
+    }
+
+    public function setTitle($value, $lang="fr") {
+        $oldTitle = $this->getTitle();
+        if($oldTitle && $oldTitle->getValue() != $value && $oldTitle->getLang() != $lang) {
+            $literalTitle = new Literal($value, $lang, null);
+            $this->setSimpleProperty($this->getProvidedCHO(), 'http://purl.org/dc/elements/1.1/title', $oldTitle, $literalTitle);
+            //clear cache
+            $this->title = false;
+        }
+    }
+
+
+
+    public function getTitleValue() {
+        $title = $this->getTitle();
+        return is_null($title)?null:$title->getValue();
+    }
+
+    public function getIssued() {
+        if(is_null($this->issued)) {
+            try {
+                $this->issued = $this->getProvidedCHO()->getLiteral("<http://purl.org/dc/terms/issued>");
+            } catch(\Exception $e) {
+                $this->issued = null;
+            }
+        }
+        return $this->issued;
+    }
+
+    public function getIssuedValue() {
+        $issued = $this->getIssued();
+        return is_null($issued)?null:$issued->getValue();
+    }
+
+    public function getModified() {
+        if(is_null($this->modified)) {
+            try {
+                $this->modified = $this->getProvidedCHO()->getLiteral("<http://purl.org/dc/terms/modified>");
+                if(is_null($this->modified)) {
+                    $this->modified = $this->getIssued();
+                }
+            } catch(\Exception $e) {
+                $this->modified = null;
+            }
+        }
+        return $this->modified;
+    }
+
+    public function setModified($value = null) {
+        if(is_null($value)) {
+            $value = gmdate(\DateTime::ATOM);
+        } elseif ($value instanceof \DateTime) {
+            $value = $value->format(\DateTime::ATOM);
+        }
+        $value = preg_replace('/[\+\-]00(\:?)00$/', 'Z', $value);
+
+        $modified = $this->getModified();
+        if($value && (!$modified || $modified->getValue() !== $value) ) {
+
+            $newModified = new Literal($value, null, "http://purl.org/dc/terms/W3CDTF");
+            $this->setSimpleProperty($this->getProvidedCHO(), 'http://purl.org/dc/terms/modified', $modified, $newModified);
+
+            $this->modified = null;
+        }
+    }
+
+
+    public function getModifiedValue() {
+        $modified = $this->getModified();
+        return is_null($modified)?null:$modified->getValue();
+    }
+
+
+    public function jsonSerialize() {
+        if(!$this->graph) {
+            return [
+                'id' => $this->getId(),
+            ];
+        } else {
+            $res = [
+                'id' => $this->getId(),
+                'uri' => $this->getUri(),
+                'title' => $this->getTitleValue(),
+                'language' => $this->getLanguageValue(),
+                'modified' => $this->getModifiedValue(),
+                'issued' => $this->getIssuedValue()            ];
+
+            if($this->language_resolved) {
+                $res['language_resolved'] = $this->getLanguageResolved();
+            }
+
+            return $res;
+        }
+    }
+}