update bed tabix for new tabix

GMOD · Sep 8, 2018 · 3dfefac · 3dfefac
1 parent 5b1e96f
commit 3dfefac
Showing 1 changed file with 7 additions and 25 deletions.
diff --git a/src/JBrowse/Store/SeqFeature/BEDTabix.js b/src/JBrowse/Store/SeqFeature/BEDTabix.js
@@ -89,32 +89,14 @@ return declare( [ SeqFeatureStore, DeferredStatsMixin, DeferredFeaturesMixin, In
 
     /**fetch and parse the Header line */
     getHeader: function() {
-        var thisB = this;
-        return this._parsedHeader || ( this._parsedHeader = function() {
-                var d = new Deferred();
-                var reject = lang.hitch( d, 'reject' );
-
-                thisB.indexedData.indexLoaded.then( function() {
-                        var maxFetch = thisB.indexedData.index.firstDataLine
-                            ? (thisB.indexedData.index.firstDataLine.block + thisB.indexedData.data.blockSize - 1) * 2
-                            : null;
-
-                        thisB.indexedData.data.read(
-                            0,
-                            maxFetch,
-                            function( bytes ) {
-                                thisB.parser.parseHeader( new Uint8Array( bytes ) );
-                                d.resolve( thisB.header );
-                            },
-                            reject
-                        );
-                    },
-                    reject
-                );
-
-                return d;
-            }.call(this));
+        if (!this._parsedHeader) {
+            this._parsedHeader = this.indexedData.featureCount('nonexistent')
+                .then(() => this.indexedData.getHeader())
+                .then(bytes => this.parser.parseHeader(bytes))
+        }
+        return this._parsedHeader
     },
+
     _getFeatures: function(query, featureCallback, finishCallback, errorCallback){
         this.getHeader().then(() => {
             this.indexedData.getLines(