sintexplicabo/src/Iterator.ts

import {array, IteratorInterface, listIteratorInterface} from "./Interface";
import {NoSuchElementException} from "./Exception";
/***
 * @Iterator
 */
export class Iterator<E> implements IteratorInterface<E>{
    /***
     *
     */
    protected iteration : number = 0;
    /***
     *
     */
    protected list : array<E>    = [];
    /***
     *
     * @param value
     */
    constructor( value : array<E> ) {this.list = value;}
    /***
     *
     * @param key
     */
    protected get( key : number ) : E{
        if(this.list[key]===undefined) throw new NoSuchElementException(`elements [ ${key} ] is not defined`);
        return this.list[key];
    }
    /***
     *
     */
    public hasNext(): boolean {
        return this.iteration+1<=this.list.length;
    }
    /***
     *
     */
    public next(): E {
        let key : number = this.iteration;
        this.iteration++;
        return this.get(key);
    }
}

/***
 * @ListIterator
 */
export class ListIterator<E> extends Iterator<E> implements listIteratorInterface<E>{
    /***
     *
     * @param listIterate
     */
    constructor( listIterate : array<E>) {
        super(listIterate);
    }
    /***
     *
     * @param e
     */
    public add(e: E) : void{
        this.list[this.iteration++] = e;
    };
    /***
     *
     */
    public hasPrevious() : boolean{
        try{this.get(this.iteration-1);return true;}catch (e) {
            return false;
        }
    }
    /***
     *
     */
    public nextIndex() : number {
        try{this.get(this.iteration);return this.iteration;}catch (e) {
            return null;
        }
    };
    /***
     *
     */
    public previousIndex() : number {
        try{this.get(this.iteration-1);return this.iteration-1;}catch (e) {
            return null;
        }
    };
    /***
     *
     */
    public previous() :E{
        this.iteration--;
        return this.get(this.iteration);
    }
    /***
     *
     * @param e
     */
    public set (e: E) : void{
        this.list[this.iteration-1]= e;
    }
}