setIdentifier(id = "") {
        if (id.length === 0) return;
        if (this.scope.tunnelList[this.identifier])
            this.scope.tunnelList[this.identifier].clean(this);
        this.identifier = id;
        if (this.scope.tunnelList[this.identifier])
            this.scope.tunnelList[this.identifier].push(this);
        else this.scope.tunnelList[this.identifier] = [this];

        // Change the bitwidth to be same as the other elements with this.identifier
        if (this.scope.tunnelList[this.identifier] && this.scope.tunnelList[this.identifier].length > 1) {
            this.bitWidth = this.inp1.bitWidth = this.scope.tunnelList[this.identifier][0].bitWidth;
        }

        const len = this.identifier.length;
        if (len === 1) this.xSize = 40;
        else if (len > 1 && len < 4) this.xSize = 20;
        else this.xSize = 0;
        this.setBounds();
    }
@memberof Tunnel
function to set tunnel identifier value
@param {string=} id - id so that every link is unique