converter/src/app/inputcomponentmanager.service.ts

import {Injectable} from "@angular/core";
import {Step} from "./step";

@Injectable()
export class InputComponentManagerService {
    private components:Step[] = [];

    public constructor() {
    }

    public register(component:Step):void {
        this.components.push(component);
    }

    public getAllComponents():Step[] {
        return this.components;
    }

    public getNext(component:Step):Step {
        let index:number = component.index;
        if (index == this.components.length - 1) {
            this.addComponent();
        }
        return this.components[index + 1];
    }

    public getFirst():Step {
        if (this.components.length == 0) {
            this.addComponent();
        }
        return this.components[0];
    }

    private addComponent():void {
        this.register(new Step(this.components.length));
    }
}