refactors metadata handling

bibtexbrowser.php

@@ -3211,6 +3211,37 @@ class BibEntryDisplay {
     }
 
     if (METADATA_GS) {
+      $result = $this->metadata_google_scholar($result);
+    } // end Google Scholar
+
+    // a fallback to essential dublin core
+    if (METADATA_DC) {
+      $result = $this->metadata_dublin_core($result);
+    }
+    
+    if (METADATA_EPRINTS) {
+      $result = $this->metadata_eprints($result);
+    }
+
+    return $result;    
+  } // end function metadata
+  
+  function metadata_dublin_core($result) {
+    // Dublin Core should not be used for bibliographic metadata
+    // according to several sources
+    //  * Google Scholar: "Use Dublin Core tags (e.g., DC.title) as a last resort - they work poorly for journal papers"
+    //  * http://reprog.wordpress.com/2010/09/03/bibliographic-data-part-2-dublin-cores-dirty-little-secret/
+    // however it seems that Google Scholar needs at least DC.Title to trigger referencing
+    // reference documentation: http://dublincore.org/documents/dc-citation-guidelines/
+    $result[] = array('DC.Title',$this->bib->getTitle());
+    foreach($this->bib->getArrayOfCommaSeparatedAuthors() as $author) {
+      $result[] = array('DC.Creator',$author);
+    }
+    $result[] = array('DC.Issued',$this->bib->getYear());
+    return $result;
+  }
+  
+  function metadata_google_scholar($result) {
     // the description may mix with the Google Scholar tags
     // we remove it
     // $result[] = array('description',trim(strip_tags(str_replace('"','',bib2html($this->bib)))));
@@ -3290,33 +3321,10 @@ class BibEntryDisplay {
     }
     }
       
-    } // end Google Scholar
-
-    // we don't introduce yet another kind of bibliographic metadata
-    // the core bibtex metadata will simply be available as json
-    // now adding the pure bibtex with no translation
-    //foreach ($this->bib->getFields() as $k => $v) {
-    //  if (!preg_match("/^_/",$k)) {
-    //    $result[] = array("bibtex:".$k,$v);
-    //  }
-    //}
-
-
-    // a fallback to essential dublin core
-    // Dublin Core should not be used for bibliographic metadata
-    // according to several sources
-    //  * Google Scholar: "Use Dublin Core tags (e.g., DC.title) as a last resort - they work poorly for journal papers"
-    //  * http://reprog.wordpress.com/2010/09/03/bibliographic-data-part-2-dublin-cores-dirty-little-secret/
-    // however it seems that Google Scholar needs at least DC.Title to trigger referencing
-    // reference documentation: http://dublincore.org/documents/dc-citation-guidelines/
-    if (METADATA_DC) {
-    $result[] = array('DC.Title',$this->bib->getTitle());
-    foreach($this->bib->getArrayOfCommaSeparatedAuthors() as $author) {
-      $result[] = array('DC.Creator',$author);
-    }
-    $result[] = array('DC.Issued',$this->bib->getYear());
+    return $result;
   }
   
+  function metadata_eprints($result) {
     // --------------------------------- BEGIN METADATA EPRINTS
     // and now adding eprints metadata
     // why adding eprints metadata?
@@ -3326,7 +3334,6 @@ class BibEntryDisplay {
     // reference documentation: the eprints source code (./perl_lib/EPrints/Plugin/Export/Simple.pm)
     // examples: conference paper: http://tubiblio.ulb.tu-darmstadt.de/44344/
     //           journal paper: http://tubiblio.ulb.tu-darmstadt.de/44344/
-    if (METADATA_EPRINTS) {
     $result[] = array('eprints.title',$this->bib->getTitle());
     $authors = $this->bib->getArrayOfCommaSeparatedAuthors();
     foreach($authors as $author) {
@@ -3379,13 +3386,10 @@ class BibEntryDisplay {
     if ($this->bib->hasField('url')) {
       $result[] = array('eprints.official_url',$this->bib->getField('url'));
     }
-    }
     // --------------------------------- END METADATA EPRINTS
-
     return $result;
-
-  }
-}
+  } // end method metatada_eprints;
+} // end class BibEntryDisplay
 
 
 // ----------------------------------------------------------------------