rating component #521 (#1810)

* rating component #521

* use adf prefix

ng2-components/ng2-alfresco-social/src/components/like.component.ts

@@ -0,0 +1,80 @@
+/*!
+ * @license
+ * Copyright 2016 Alfresco Software, Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { Component, Input, Output, EventEmitter } from '@angular/core';
+import { RatingService } from './../services/rating.service';
+
+@Component({
+    selector: 'adf-like',
+    styleUrls: ['./like.component.css'],
+    templateUrl: './like.component.html',
+    providers: [RatingService]
+})
+export class LikeComponent {
+
+    @Input()
+    nodeId: string;
+
+    likesCounter: number = 0;
+
+    ratingType: string = 'likes';
+
+    isLike: boolean = false;
+
+    @Output()
+    changeVote = new EventEmitter();
+
+    constructor(private ratingService: RatingService) {
+    }
+
+    ngOnChanges() {
+        let ratingObserver = this.ratingService.getRating(this.nodeId, this.ratingType);
+
+        ratingObserver.subscribe(
+            (data) => {
+                if (data.entry.aggregate) {
+                    this.likesCounter = data.entry.aggregate.numberOfRatings;
+                    if (data.entry.ratedAt) {
+                        this.isLike = true;
+                    }
+                }
+            }
+        );
+
+        return ratingObserver;
+    }
+
+    likeClick() {
+        if (this.isLike) {
+            this.ratingService.deleteRating(this.nodeId, this.ratingType).subscribe(
+                () => {
+                    this.likesCounter -= 1;
+                    this.isLike = false;
+                }
+            );
+        } else {
+            this.ratingService.postRating(this.nodeId, this.ratingType, true).subscribe(
+                (data) => {
+                    this.likesCounter = data.entry.aggregate.numberOfRatings;
+                    this.isLike = true;
+                }
+            );
+        }
+
+        this.changeVote.emit(this.likesCounter);
+    }
+}