Add electron

backend/src/Model/Edge.ts

@@ -0,0 +1,35 @@
+import { Hashable, TreeNode } from './'
+const sha1 = require('sha1')
+
+export class Edge implements Hashable {
+  public name: string
+
+  public node!: TreeNode
+  public source?: TreeNode | undefined
+  private cachedHash?: string
+
+  constructor(name: string) {
+    this.name = name
+  }
+
+  public edges() {
+    return this.node ? Object.values(this.node.edges) : []
+  }
+
+  public hash(): string {
+    if (!this.cachedHash) {
+      let previousHash = (this.source && this.source.sourceEdge) ? this.source.sourceEdge.hash() : ''
+      this.cachedHash = 'H' + sha1(previousHash + this.name)
+    }
+
+    return this.cachedHash
+  }
+
+  public firstEdge(): Edge {
+    if (this.source && this.source.sourceEdge) {
+      return this.source.sourceEdge.firstEdge()
+    } else {
+      return this
+    }
+  }
+}