Split classes out of Graph.js

GraphLink.js

@@ -0,0 +1,32 @@
+class GraphLink {
+  constructor() {
+  }
+
+  resolve(nodesByLabel) {
+    this.from = nodesByLabel.get(this.fromLabel);
+    this.to = nodesByLabel.get(this.toLabel);
+    for (let from of this.from) {
+      for (let to of this.to) {
+        from.links.push(to);
+        to.linksIn.push(from);
+      }
+    }
+  }
+
+  setPageRank() {
+    for (let to of this.to) {
+      to.incPageRank(new Set());
+    }
+  }
+
+  static process(item) {
+    let link = new GraphLink();
+    link.label = item.label;
+    link.fromLabel = item.from.label;
+    link.toLabel = item.to.label;
+    if (link.fromLabel == '' || link.toLabel == '') {
+      return null;
+    }
+    return link;
+  }
+}