import { Injectable } from '@angular/core';
import { BaseEntity } from 'ivy.angular.data';
import { BaseEnumEntity } from 'ivy.angular.data';
@Injectable()
export class CollectionHelper {
range(count: number, start: number = 0): number[] {
let arr = Array.from(new Array(count).keys());
if (start != 0) {
arr = arr.map((val, index) => index + start);
}
return arr;
}
max(col: number[]): number {
return this.internalMax<number>(col);
}
maxDate(col: Date[]): Date {
return this.internalMax<Date>(col);
}
min(col: number[]): number {
return this.internalMin<number>(col);
}
minDate(col: Date[]): Date {
return this.internalMin<Date>(col);
}
firstOrDefault<T>(col: T[]): T {
if (col.length == 0) {
return null;
} else {
return col[0];
}
}
remove<T>(coll: T[], item: T): void {
coll.splice(coll.indexOf(item), 1);
}
getEntityById<T extends BaseEntity>(coll: T[], id: number): T {
for (var i = 0; i < coll.length; i++) {
if (coll[i].id == id) {
return coll[i];
}
}
return null;
}
getEnumEntityByName<T extends BaseEnumEntity>(coll: T[], name: string): T {
for (var i = 0; i < coll.length; i++) {
if (coll[i].name == name) {
return coll[i];
}
}
return null;
}
removeEntity<T extends BaseEntity>(coll: T[], item: T): void {
for (var i = 0; i < coll.length; i++) {
if (coll[i].id == item.id) {
coll.splice(i, 1);
return;
}
}
}
containsEntity<T extends BaseEntity>(coll: T[], item: T): boolean {
for (var i = 0; i < coll.length; i++) {
if (coll[i].id == item.id) {
return true;
}
}
return false;
}
addOrRemoveEntity<T extends BaseEntity>(coll: T[], item: T): void {
if (this.containsEntity(coll, item)) {
this.removeEntity(coll, item);
} else {
coll.push(item);
}
}
private internalMax<T>(col: T[]): T {
Iif (col.length == 0) return null;
let max = col[0];
for (var i = 0; i < col.length; i++) {
if (col[i] > max)
max = col[i];
}
return max;
}
private internalMin<T>(col: T[]): T {
Iif (col.length == 0) return null;
let min = col[0];
for (var i = 0; i < col.length; i++) {
Iif (col[i] < min)
min = col[i];
}
return min;
}
} |