Entity Relations Table

+///
+/// Copyright © 2016-2019 The Thingsboard Authors
+///
+/// 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 { Injectable } from '@angular/core';
+import { defaultHttpOptions } from './http-utils';
+import { Observable } from 'rxjs/index';
+import { HttpClient } from '@angular/common/http';
+import { EntityRelation, EntityRelationInfo, EntityRelationsQuery } from '@shared/models/relation.models';
+import { EntityId } from '@app/shared/models/id/entity-id';
+
+@Injectable({
+  providedIn: 'root'
+})
+export class EntityRelationService {
+
+  constructor(
+    private http: HttpClient
+  ) { }
+
+  public saveRelation(relation: EntityRelation, ignoreErrors: boolean = false, ignoreLoading: boolean = false): Observable<EntityRelation> {
+    return this.http.post<EntityRelation>('/api/relation', relation, defaultHttpOptions(ignoreLoading, ignoreErrors));
+  }
+
+  public deleteRelation(fromId: EntityId, relationType: string, toId: EntityId,
+                        ignoreErrors: boolean = false, ignoreLoading: boolean = false) {
+    return this.http.delete(`/api/relation?fromId=${fromId.id}&fromType=${fromId.entityType}` +
+      `&relationType=${relationType}&toId=${toId.id}&toType=${toId.entityType}`,
+      defaultHttpOptions(ignoreLoading, ignoreErrors));
+  }
+
+  public deleteRelations(entityId: EntityId,
+                         ignoreErrors: boolean = false, ignoreLoading: boolean = false) {
+    return this.http.delete(`/api/relations?entityId=${entityId.id}&entityType=${entityId.entityType}`,
+      defaultHttpOptions(ignoreLoading, ignoreErrors));
+  }
+
+  public getRelation(fromId: EntityId, relationType: string, toId: EntityId,
+                     ignoreErrors: boolean = false, ignoreLoading: boolean = false): Observable<EntityRelation> {
+    return this.http.get<EntityRelation>(`/api/relation?fromId=${fromId.id}&fromType=${fromId.entityType}` +
+      `&relationType=${relationType}&toId=${toId.id}&toType=${toId.entityType}`,
+      defaultHttpOptions(ignoreLoading, ignoreErrors));
+  }
+
+  public findByFrom(fromId: EntityId,
+                    ignoreErrors: boolean = false, ignoreLoading: boolean = false): Observable<Array<EntityRelation>> {
+    return this.http.get<Array<EntityRelation>>(
+      `/api/relations?fromId=${fromId.id}&fromType=${fromId.entityType}`,
+      defaultHttpOptions(ignoreLoading, ignoreErrors));
+  }
+
+  public findInfoByFrom(fromId: EntityId,
+                        ignoreErrors: boolean = false, ignoreLoading: boolean = false): Observable<Array<EntityRelationInfo>> {
+    return this.http.get<Array<EntityRelationInfo>>(
+      `/api/relations/info?fromId=${fromId.id}&fromType=${fromId.entityType}`,
+      defaultHttpOptions(ignoreLoading, ignoreErrors));
+  }
+
+  public findByFromAndType(fromId: EntityId, relationType: string,
+                           ignoreErrors: boolean = false, ignoreLoading: boolean = false): Observable<Array<EntityRelation>> {
+    return this.http.get<Array<EntityRelation>>(
+      `/api/relations?fromId=${fromId.id}&fromType=${fromId.entityType}&relationType=${relationType}`,
+      defaultHttpOptions(ignoreLoading, ignoreErrors));
+  }
+
+  public findByTo(toId: EntityId,
+                  ignoreErrors: boolean = false, ignoreLoading: boolean = false): Observable<Array<EntityRelation>> {
+    return this.http.get<Array<EntityRelation>>(
+      `/api/relations?toId=${toId.id}&toType=${toId.entityType}`,
+      defaultHttpOptions(ignoreLoading, ignoreErrors));
+  }
+
+  public findInfoByTo(toId: EntityId,
+                      ignoreErrors: boolean = false, ignoreLoading: boolean = false): Observable<Array<EntityRelationInfo>> {
+    return this.http.get<Array<EntityRelationInfo>>(
+      `/api/relations/info?toId=${toId.id}&toType=${toId.entityType}`,
+      defaultHttpOptions(ignoreLoading, ignoreErrors));
+  }
+
+  public findByToAndType(toId: EntityId, relationType: string,
+                         ignoreErrors: boolean = false, ignoreLoading: boolean = false): Observable<Array<EntityRelation>> {
+    return this.http.get<Array<EntityRelation>>(
+      `/api/relations?toId=${toId.id}&toType=${toId.entityType}&relationType=${relationType}`,
+      defaultHttpOptions(ignoreLoading, ignoreErrors));
+  }
+
+  public findByQuery(query: EntityRelationsQuery,
+                     ignoreErrors: boolean = false, ignoreLoading: boolean = false): Observable<Array<EntityRelation>> {
+    return this.http.post<Array<EntityRelation>>(
+      '/api/relations', query,
+      defaultHttpOptions(ignoreLoading, ignoreErrors));
+  }
+
+  public findInfoByQuery(query: EntityRelationsQuery,
+                         ignoreErrors: boolean = false, ignoreLoading: boolean = false): Observable<Array<EntityRelationInfo>> {
+    return this.http.post<Array<EntityRelationInfo>>(
+      '/api/relations/info', query,
+      defaultHttpOptions(ignoreLoading, ignoreErrors));
+  }
+
+}

@@ -26,6 +26,7 @@ import { AuditLogDetailsDialogComponent } from './audit-log/audit-log-details-di
 import { AuditLogTableComponent } from './audit-log/audit-log-table.component';
 import { EventTableHeaderComponent } from '@home/components/event/event-table-header.component';
 import { EventTableComponent } from '@home/components/event/event-table.component';
+import { RelationTableComponent } from '@home/components/relation/relation-table.component';
 
 @NgModule({
   entryComponents: [
@@ -43,7 +44,8 @@ import { EventTableComponent } from '@home/components/event/event-table.componen
       AuditLogTableComponent,
       AuditLogDetailsDialogComponent,
       EventTableHeaderComponent,
-      EventTableComponent
+      EventTableComponent,
+      RelationTableComponent
     ],
   imports: [
     CommonModule,
@@ -56,7 +58,8 @@ import { EventTableComponent } from '@home/components/event/event-table.componen
     EntityDetailsPanelComponent,
     ContactComponent,
     AuditLogTableComponent,
-    EventTableComponent
+    EventTableComponent,
+    RelationTableComponent
   ]
 })
 export class HomeComponentsModule { }

+<!--
+
+    Copyright © 2016-2019 The Thingsboard Authors
+
+    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.
+
+-->
+<div class="mat-padding tb-entity-table tb-absolute-fill">
+  <div fxFlex fxLayout="column" class="mat-elevation-z1 tb-entity-table-content">
+    <mat-toolbar class="mat-table-toolbar" [fxShow]="!textSearchMode && dataSource.selection.isEmpty()">
+      <div class="mat-toolbar-tools">
+        <span class="tb-entity-table-title">{{(direction == directions.FROM ?
+            'relation.from-relations' : 'relation.to-relations') | translate}}</span>
+        <mat-form-field class="mat-block tb-relation-direction" style="width: 200px;">
+          <mat-label translate>relation.direction</mat-label>
+          <mat-select matInput [ngModel]="direction"
+                      (ngModelChange)="directionChanged($event)">
+            <mat-option *ngFor="let type of directionTypes" [value]="type">
+              {{ directionTypeTranslations.get(type) | translate }}
+            </mat-option>
+          </mat-select>
+        </mat-form-field>
+        <span fxFlex></span>
+        <button mat-button mat-icon-button [disabled]="isLoading$ | async"
+                (click)="addRelation($event)"
+                matTooltip="{{ 'action.add' | translate }}"
+                matTooltipPosition="above">
+          <mat-icon>add</mat-icon>
+        </button>
+        <button mat-button mat-icon-button [disabled]="isLoading$ | async" (click)="reloadRelations()"
+                matTooltip="{{ 'action.refresh' | translate }}"
+                matTooltipPosition="above">
+          <mat-icon>refresh</mat-icon>
+        </button>
+        <button mat-button mat-icon-button [disabled]="isLoading$ | async" (click)="enterFilterMode()"
+                matTooltip="{{ 'action.search' | translate }}"
+                matTooltipPosition="above">
+          <mat-icon>search</mat-icon>
+        </button>
+      </div>
+    </mat-toolbar>
+    <mat-toolbar class="mat-table-toolbar" [fxShow]="textSearchMode && dataSource.selection.isEmpty()">
+      <div class="mat-toolbar-tools">
+        <button mat-button mat-icon-button
+                matTooltip="{{ 'action.search' | translate }}"
+                matTooltipPosition="above">
+          <mat-icon>search</mat-icon>
+        </button>
+        <mat-form-field fxFlex>
+          <mat-label>&nbsp;</mat-label>
+          <input #searchInput matInput
+                 [(ngModel)]="pageLink.textSearch"
+                 placeholder="{{ 'common.enter-search' | translate }}"/>
+        </mat-form-field>
+        <button mat-button mat-icon-button (click)="exitFilterMode()"
+                matTooltip="{{ 'action.close' | translate }}"
+                matTooltipPosition="above">
+          <mat-icon>close</mat-icon>
+        </button>
+      </div>
+    </mat-toolbar>
+    <mat-toolbar class="mat-table-toolbar" color="primary" [fxShow]="!dataSource.selection.isEmpty()">
+      <div class="mat-toolbar-tools">
+                <span>
+                  {{ translate.get('relation.selected-relations', {count: dataSource.selection.selected.length}) | async }}
+                </span>
+        <span fxFlex></span>
+        <button mat-button mat-icon-button [disabled]="isLoading$ | async"
+                matTooltip="{{ 'action.delete' | translate }}"
+                matTooltipPosition="above"
+                (click)="deleteRelations($event)">
+          <mat-icon>delete</mat-icon>
+        </button>
+      </div>
+    </mat-toolbar>
+    <div fxFlex class="table-container">
+      <mat-table [dataSource]="dataSource"
+                 matSort [matSortActive]="pageLink.sortOrder.property" [matSortDirection]="(pageLink.sortOrder.direction + '').toLowerCase()" matSortDisableClear>
+        <ng-container matColumnDef="select" sticky>
+          <mat-header-cell *matHeaderCellDef>
+            <mat-checkbox (change)="$event ? dataSource.masterToggle() : null"
+                          [checked]="dataSource.selection.hasValue() && (dataSource.isAllSelected() | async)"
+                          [indeterminate]="dataSource.selection.hasValue() && !(dataSource.isAllSelected() | async)">
+            </mat-checkbox>
+          </mat-header-cell>
+          <mat-cell *matCellDef="let relation">
+            <mat-checkbox (click)="$event.stopPropagation()"
+                          (change)="$event ? dataSource.selection.toggle(relation) : null"
+                          [checked]="dataSource.selection.isSelected(relation)">
+            </mat-checkbox>
+          </mat-cell>
+        </ng-container>
+        <ng-container matColumnDef="type">
+          <mat-header-cell *matHeaderCellDef mat-sort-header> {{ 'relation.type' | translate }} </mat-header-cell>
+          <mat-cell *matCellDef="let relation">
+            {{ relation.type }}
+          </mat-cell>
+        </ng-container>
+        <ng-container *ngIf="direction === directions.FROM" matColumnDef="toEntityTypeName">
+          <mat-header-cell *matHeaderCellDef mat-sort-header> {{ 'relation.to-entity-type' | translate }} </mat-header-cell>
+          <mat-cell *matCellDef="let relation">
+            {{ relation.toEntityTypeName }}
+          </mat-cell>
+        </ng-container>
+        <ng-container *ngIf="direction === directions.FROM" matColumnDef="toName">
+          <mat-header-cell *matHeaderCellDef mat-sort-header> {{ 'relation.to-entity-name' | translate }} </mat-header-cell>
+          <mat-cell *matCellDef="let relation">
+            {{ relation.toName }}
+          </mat-cell>
+        </ng-container>
+        <ng-container *ngIf="direction === directions.TO" matColumnDef="fromEntityTypeName">
+          <mat-header-cell *matHeaderCellDef mat-sort-header> {{ 'relation.from-entity-type' | translate }} </mat-header-cell>
+          <mat-cell *matCellDef="let relation">
+            {{ relation.fromEntityTypeName }}
+          </mat-cell>
+        </ng-container>
+        <ng-container *ngIf="direction === directions.TO" matColumnDef="fromName">
+          <mat-header-cell *matHeaderCellDef mat-sort-header> {{ 'relation.from-entity-name' | translate }} </mat-header-cell>
+          <mat-cell *matCellDef="let relation">
+            {{ relation.fromName }}
+          </mat-cell>
+        </ng-container>
+        <ng-container matColumnDef="actions" stickyEnd>
+          <mat-header-cell *matHeaderCellDef [ngStyle]="{ minWidth: '80px', maxWidth: '80px' }">
+          </mat-header-cell>
+          <mat-cell *matCellDef="let relation" [ngStyle]="{ minWidth: '80px', maxWidth: '80px' }">
+            <div fxFlex fxLayout="row" fxLayoutAlign="end">
+              <button mat-button mat-icon-button [disabled]="isLoading$ | async"
+                      matTooltip="{{ 'relation.edit' | translate }}"
+                      matTooltipPosition="above"
+                      (click)="editRelation($event, relation)">
+                <mat-icon>edit</mat-icon>
+              </button>
+              <button mat-button mat-icon-button [disabled]="isLoading$ | async"
+                      matTooltip="{{ 'relation.delete' | translate }}"
+                      matTooltipPosition="above"
+                      (click)="deleteRelation($event, relation)">
+                <mat-icon>delete</mat-icon>
+              </button>
+            </div>
+          </mat-cell>
+        </ng-container>
+        <mat-header-row [ngClass]="{'mat-row-select': true}" *matHeaderRowDef="displayedColumns; sticky: true"></mat-header-row>
+        <mat-row [ngClass]="{'mat-row-select': true,
+                             'mat-selected': dataSource.selection.isSelected(relation)}"
+                 *matRowDef="let relation; columns: displayedColumns;" (click)="dataSource.selection.toggle(relation)"></mat-row>
+      </mat-table>
+      <span [fxShow]="dataSource.isEmpty() | async"
+            fxLayoutAlign="center center"
+            class="no-data-found" translate>{{ 'relation.no-relations-text' }}</span>
+    </div>
+    <mat-divider></mat-divider>
+    <mat-paginator [length]="dataSource.total() | async"
+                   [pageIndex]="pageLink.page"
+                   [pageSize]="pageLink.pageSize"
+                   [pageSizeOptions]="[10, 20, 30]"></mat-paginator>
+  </div>
+</div>

+/**
+ * Copyright © 2016-2019 The Thingsboard Authors
+ *
+ * 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.
+ */
+:host {
+  width: 100%;
+  height: 100%;
+  .tb-entity-table {
+    .tb-entity-table-content {
+      width: 100%;
+      height: 100%;
+      background: #fff;
+
+      .tb-entity-table-title {
+        padding-right: 20px;
+        white-space: nowrap;
+        overflow: hidden;
+        text-overflow: ellipsis;
+      }
+
+      .table-container {
+        overflow: auto;
+      }
+    }
+  }
+}
+
+:host ::ng-deep {
+  .mat-sort-header-sorted .mat-sort-header-arrow {
+    opacity: 1 !important;
+  }
+  mat-form-field.tb-relation-direction {
+    font-size: 16px;
+
+    .mat-form-field-wrapper {
+      padding-bottom: 0;
+    }
+
+    .mat-form-field-underline {
+      bottom: 0;
+    }
+  }
+}

+///
+/// Copyright © 2016-2019 The Thingsboard Authors
+///
+/// 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 { AfterViewInit, ChangeDetectionStrategy, Component, ElementRef, Input, OnInit, ViewChild } from '@angular/core';
+import { PageComponent } from '@shared/components/page.component';
+import { PageLink } from '@shared/models/page/page-link';
+import { MatPaginator } from '@angular/material/paginator';
+import { MatSort } from '@angular/material/sort';
+import { Store } from '@ngrx/store';
+import { AppState } from '@core/core.state';
+import { TranslateService } from '@ngx-translate/core';
+import { MatDialog } from '@angular/material/dialog';
+import { DialogService } from '@core/services/dialog.service';
+import { EntityRelationService } from '@core/http/entity-relation.service';
+import { Direction, SortOrder } from '@shared/models/page/sort-order';
+import { fromEvent, merge } from 'rxjs';
+import { debounceTime, distinctUntilChanged, tap } from 'rxjs/operators';
+import { EntityRelationInfo, EntitySearchDirection, entitySearchDirectionTranslations } from '@shared/models/relation.models';
+import { EntityId } from '@shared/models/id/entity-id';
+import { RelationsDatasource } from '../../models/datasource/relation-datasource';
+import { DebugEventType, EventType } from '@shared/models/event.models';
+
+@Component({
+  selector: 'tb-relation-table',
+  templateUrl: './relation-table.component.html',
+  styleUrls: ['./relation-table.component.scss'],
+  changeDetection: ChangeDetectionStrategy.OnPush
+})
+export class RelationTableComponent extends PageComponent implements AfterViewInit, OnInit {
+
+  directions = EntitySearchDirection;
+
+  directionTypes = Object.keys(EntitySearchDirection);
+
+  directionTypeTranslations = entitySearchDirectionTranslations;
+
+  displayedColumns: string[];
+  direction: EntitySearchDirection;
+  pageLink: PageLink;
+  textSearchMode = false;
+  dataSource: RelationsDatasource;
+
+  activeValue = false;
+  dirtyValue = false;
+  entityIdValue: EntityId;
+
+  viewsInited = false;
+
+  @Input()
+  set active(active: boolean) {
+    if (this.activeValue !== active) {
+      this.activeValue = active;
+      if (this.activeValue && this.dirtyValue) {
+        this.dirtyValue = false;
+        if (this.viewsInited) {
+          this.updateData(true);
+        }
+      }
+    }
+  }
+
+  @Input()
+  set entityId(entityId: EntityId) {
+    if (this.entityIdValue !== entityId) {
+      this.entityIdValue = entityId;
+      if (this.viewsInited) {
+        this.resetSortAndFilter(this.activeValue);
+        if (!this.activeValue) {
+          this.dirtyValue = true;
+        }
+      }
+    }
+  }
+
+  @ViewChild('searchInput', {static: false}) searchInputField: ElementRef;
+
+  @ViewChild(MatPaginator, {static: false}) paginator: MatPaginator;
+  @ViewChild(MatSort, {static: false}) sort: MatSort;
+
+  constructor(protected store: Store<AppState>,
+              private entityRelationService: EntityRelationService,
+              public translate: TranslateService,
+              public dialog: MatDialog,
+              private dialogService: DialogService) {
+    super(store);
+    this.dirtyValue = !this.activeValue;
+    const sortOrder: SortOrder = { property: 'type', direction: Direction.ASC };
+    this.direction = EntitySearchDirection.FROM;
+    this.pageLink = new PageLink(10, 0, null, sortOrder);
+    this.dataSource = new RelationsDatasource(this.entityRelationService, this.translate);
+    this.updateColumns();
+  }
+
+  ngOnInit() {
+  }
+
+  updateColumns() {
+    if (this.direction === EntitySearchDirection.FROM) {
+      this.displayedColumns = ['select', 'type', 'toEntityTypeName', 'toName', 'actions'];
+    } else {
+      this.displayedColumns = ['select', 'type', 'fromEntityTypeName', 'fromName', 'actions'];
+    }
+  }
+
+  directionChanged(direction: EntitySearchDirection) {
+    this.direction = direction;
+    this.updateColumns();
+    this.updateData(true);
+  }
+
+  ngAfterViewInit() {
+
+    fromEvent(this.searchInputField.nativeElement, 'keyup')
+      .pipe(
+        debounceTime(150),
+        distinctUntilChanged(),
+        tap(() => {
+          this.paginator.pageIndex = 0;
+          this.updateData();
+        })
+      )
+      .subscribe();
+
+    this.sort.sortChange.subscribe(() => this.paginator.pageIndex = 0);
+
+    merge(this.sort.sortChange, this.paginator.page)
+      .pipe(
+        tap(() => this.updateData())
+      )
+      .subscribe();
+
+    this.viewsInited = true;
+    if (this.activeValue && this.entityIdValue) {
+      this.updateData(true);
+    }
+  }
+
+  updateData(reload: boolean = false) {
+    this.pageLink.page = this.paginator.pageIndex;
+    this.pageLink.pageSize = this.paginator.pageSize;
+    this.pageLink.sortOrder.property = this.sort.active;
+    this.pageLink.sortOrder.direction = Direction[this.sort.direction.toUpperCase()];
+    this.dataSource.loadRelations(this.direction, this.entityIdValue, this.pageLink, reload);
+  }
+
+  enterFilterMode() {
+    this.textSearchMode = true;
+    this.pageLink.textSearch = '';
+    setTimeout(() => {
+      this.searchInputField.nativeElement.focus();
+      this.searchInputField.nativeElement.setSelectionRange(0, 0);
+    }, 10);
+  }
+
+  exitFilterMode() {
+    this.textSearchMode = false;
+    this.pageLink.textSearch = null;
+    this.paginator.pageIndex = 0;
+    this.updateData();
+  }
+
+  resetSortAndFilter(update: boolean = true) {
+    this.direction = EntitySearchDirection.FROM;
+    this.updateColumns();
+    this.pageLink.textSearch = null;
+    this.paginator.pageIndex = 0;
+    const sortable = this.sort.sortables.get('type');
+    this.sort.active = sortable.id;
+    this.sort.direction = 'asc';
+    if (update) {
+      this.updateData(true);
+    }
+  }
+
+  reloadRelations() {
+    this.updateData(true);
+  }
+
+  addRelation($event: Event) {
+    this.openRelationDialog($event);
+  }
+
+  editRelation($event: Event, relation: EntityRelationInfo) {
+    this.openRelationDialog($event, relation);
+  }
+
+  deleteRelation($event: Event, relation: EntityRelationInfo) {
+    if ($event) {
+      $event.stopPropagation();
+    }
+
+    // TODO:
+  }
+
+  deleteRelations($event: Event) {
+    if ($event) {
+      $event.stopPropagation();
+    }
+    if (this.dataSource.selection.selected.length > 0) {
+      // TODO:
+    }
+  }
+
+  openRelationDialog($event: Event, relation: EntityRelationInfo = null) {
+    if ($event) {
+      $event.stopPropagation();
+    }
+    // TODO:
+  }
+
+
+}

+///
+/// Copyright © 2016-2019 The Thingsboard Authors
+///
+/// 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 { CollectionViewer, DataSource } from '@angular/cdk/typings/collections';
+import { EntityRelationInfo, EntitySearchDirection } from '@shared/models/relation.models';
+import { BehaviorSubject, Observable, of, ReplaySubject } from 'rxjs';
+import { emptyPageData, PageData } from '@shared/models/page/page-data';
+import { SelectionModel } from '@angular/cdk/collections';
+import { EntityRelationService } from '@core/http/entity-relation.service';
+import { PageLink } from '@shared/models/page/page-link';
+import { catchError, map, publishReplay, refCount, take, tap } from 'rxjs/operators';
+import { EntityId } from '@app/shared/models/id/entity-id';
+import { TranslateService } from '@ngx-translate/core';
+import { entityTypeTranslations } from '@shared/models/entity-type.models';
+
+export class RelationsDatasource implements DataSource<EntityRelationInfo> {
+
+  private relationsSubject = new BehaviorSubject<EntityRelationInfo[]>([]);
+  private pageDataSubject = new BehaviorSubject<PageData<EntityRelationInfo>>(emptyPageData<EntityRelationInfo>());
+
+  public pageData$ = this.pageDataSubject.asObservable();
+
+  public selection = new SelectionModel<EntityRelationInfo>(true, []);
+
+  private allRelations: Observable<Array<EntityRelationInfo>>;
+
+  constructor(private entityRelationService: EntityRelationService,
+              private translate: TranslateService) {}
+
+  connect(collectionViewer: CollectionViewer): Observable<EntityRelationInfo[] | ReadonlyArray<EntityRelationInfo>> {
+    return this.relationsSubject.asObservable();
+  }
+
+  disconnect(collectionViewer: CollectionViewer): void {
+    this.relationsSubject.complete();
+    this.pageDataSubject.complete();
+  }
+
+  loadRelations(direction: EntitySearchDirection, entityId: EntityId,
+                pageLink: PageLink, reload: boolean = false): Observable<PageData<EntityRelationInfo>> {
+    if (reload) {
+      this.allRelations = null;
+    }
+    const result = new ReplaySubject<PageData<EntityRelationInfo>>();
+    this.fetchRelations(direction, entityId, pageLink).pipe(
+      tap(() => {
+        this.selection.clear();
+      }),
+      catchError(() => of(emptyPageData<EntityRelationInfo>())),
+    ).subscribe(
+      (pageData) => {
+        this.relationsSubject.next(pageData.data);
+        this.pageDataSubject.next(pageData);
+        result.next(pageData);
+      }
+    );
+    return result;
+  }
+
+  fetchRelations(direction: EntitySearchDirection, entityId: EntityId,
+                 pageLink: PageLink): Observable<PageData<EntityRelationInfo>> {
+    return this.getAllRelations(direction, entityId).pipe(
+      map((data) => pageLink.filterData(data))
+    );
+  }
+
+  getAllRelations(direction: EntitySearchDirection, entityId: EntityId): Observable<Array<EntityRelationInfo>> {
+    if (!this.allRelations) {
+      let relationsObservable: Observable<Array<EntityRelationInfo>>;
+      switch (direction) {
+        case EntitySearchDirection.FROM:
+          relationsObservable = this.entityRelationService.findInfoByFrom(entityId);
+          break;
+        case EntitySearchDirection.TO:
+          relationsObservable = this.entityRelationService.findInfoByTo(entityId);
+          break;
+      }
+      this.allRelations = relationsObservable.pipe(
+        map(relations => {
+          relations.forEach(relation => {
+            if (direction === EntitySearchDirection.FROM) {
+              relation.toEntityTypeName = this.translate.instant(entityTypeTranslations.get(relation.to.entityType).type);
+            } else {
+              relation.fromEntityTypeName = this.translate.instant(entityTypeTranslations.get(relation.from.entityType).type);
+            }
+          });
+          return relations;
+        }),
+        publishReplay(1),
+        refCount()
+      );
+    }
+    return this.allRelations;
+  }
+
+  isAllSelected(): Observable<boolean> {
+    const numSelected = this.selection.selected.length;
+    return this.relationsSubject.pipe(
+      map((relations) => numSelected === relations.length)
+    );
+  }
+
+  isEmpty(): Observable<boolean> {
+    return this.relationsSubject.pipe(
+      map((relations) => !relations.length)
+    );
+  }
+
+  total(): Observable<number> {
+    return this.pageDataSubject.pipe(
+      map((pageData) => pageData.totalElements)
+    );
+  }
+
+  masterToggle() {
+    this.relationsSubject.pipe(
+      tap((relations) => {
+        const numSelected = this.selection.selected.length;
+        if (numSelected === relations.length) {
+          this.selection.clear();
+        } else {
+          relations.forEach(row => {
+            this.selection.select(row);
+          });
+        }
+      }),
+      take(1)
+    ).subscribe();
+  }
+}

@@ -20,6 +20,10 @@
   <tb-event-table [active]="eventsTab.isActive" [defaultEventType]="eventTypes.ERROR" [tenantId]="entity.tenantId.id"
                   [entityId]="entity.id"></tb-event-table>
 </mat-tab>
+<mat-tab *ngIf="entity"
+         label="{{ 'relation.relations' | translate }}" #relationsTab="matTab">
+  <tb-relation-table [active]="relationsTab.isActive" [entityId]="entity.id"></tb-relation-table>
+</mat-tab>
 <mat-tab *ngIf="entity && authUser.authority === authorities.TENANT_ADMIN"
          label="{{ 'audit-log.audit-logs' | translate }}" #auditLogsTab="matTab">
   <tb-audit-log-table [active]="auditLogsTab.isActive" [auditLogMode]="auditLogModes.ENTITY" [entityId]="entity.id" detailsMode="true"></tb-audit-log-table>

@@ -14,16 +14,17 @@
 /// limitations under the License.
 ///
 
-import { BaseData, HasId } from '@shared/models/base-data';
+import { PageLink } from '@shared/models/page/page-link';
+import { Direction, SortOrder } from '@shared/models/page/sort-order';
 
-export interface PageData<T extends BaseData<HasId>> {
+export interface PageData<T> {
   data: Array<T>;
   totalPages: number;
   totalElements: number;
   hasNext: boolean;
 }
 
-export function emptyPageData<T extends BaseData<HasId>>(): PageData<T> {
+export function emptyPageData<T>(): PageData<T> {
   return {
     data: [],
     totalPages: 0,

@@ -15,6 +15,27 @@
 ///
 
 import { Direction, SortOrder } from '@shared/models/page/sort-order';
+import { emptyPageData, PageData } from '@shared/models/page/page-data';
+
+export type PageLinkSearchFunction<T> = (entity: T, textSearch: string) => boolean;
+
+const defaultPageLinkSearchFunction: PageLinkSearchFunction<any> =
+  (entity: any, textSearch: string) => {
+    if (textSearch === null || !textSearch.length) {
+      return true;
+    }
+    const expected = ('' + textSearch).toLowerCase();
+    for (const key of Object.keys(entity)) {
+      const val = entity[key];
+      if (val !== null && val !== Object(val)) {
+        const actual = ('' + val).toLowerCase();
+        if (actual.indexOf(expected) !== -1) {
+          return true;
+        }
+      }
+    }
+    return false;
+  };
 
 export class PageLink {
 
@@ -65,6 +86,25 @@ export class PageLink {
     return 0;
   }
 
+  public filterData<T>(data: Array<T>,
+                       searchFunction: PageLinkSearchFunction<T> = defaultPageLinkSearchFunction): PageData<T> {
+    const pageData = emptyPageData<T>();
+    pageData.data = [...data];
+    if (this.textSearch && this.textSearch.length) {
+      pageData.data = pageData.data.filter((entity) => searchFunction(entity, this.textSearch));
+    }
+    pageData.totalElements = pageData.data.length;
+    pageData.totalPages = Math.ceil(pageData.totalElements / this.pageSize);
+    if (this.sortOrder) {
+      pageData.data = pageData.data.sort(this.sort);
+    }
+    const startIndex = this.pageSize * this.page;
+    const endIndex = startIndex + this.pageSize;
+    pageData.data = pageData.data.slice(startIndex, startIndex + this.pageSize);
+    pageData.hasNext = pageData.totalElements > startIndex + pageData.data.length;
+    return pageData;
+  }
+
 }
 
 export class TimePageLink extends PageLink {

+///
+/// Copyright © 2016-2019 The Thingsboard Authors
+///
+/// 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 { EntityId } from '@shared/models/id/entity-id';
+import { EntityType } from '@shared/models/entity-type.models';
+import { ActionStatus } from '@shared/models/audit-log.models';
+
+export const CONTAINS_TYPE = 'Contains';
+export const MANAGES_TYPE = 'Manages';
+
+export const RelationTypes = [
+  CONTAINS_TYPE,
+  MANAGES_TYPE
+];
+
+export enum RelationTypeGroup {
+  COMMON = 'COMMON',
+  ALARM = 'ALARM',
+  DASHBOARD = 'DASHBOARD',
+  RULE_CHAIN = 'RULE_CHAIN',
+  RULE_NODE = 'RULE_NODE',
+}
+
+export enum EntitySearchDirection {
+  FROM = 'FROM',
+  TO = 'TO'
+}
+
+export const entitySearchDirectionTranslations = new Map<EntitySearchDirection, string>(
+  [
+    [EntitySearchDirection.FROM, 'relation.search-direction.FROM'],
+    [EntitySearchDirection.TO, 'relation.search-direction.TO'],
+  ]
+);
+
+export const directionTypeTranslations = new Map<EntitySearchDirection, string>(
+  [
+    [EntitySearchDirection.FROM, 'relation.direction-type.FROM'],
+    [EntitySearchDirection.TO, 'relation.direction-type.TO'],
+  ]
+);
+
+export interface EntityTypeFilter {
+  relationType: string;
+  entityTypes: Array<EntityType>;
+}
+
+export interface RelationsSearchParameters {
+  rootId: string;
+  rootType: EntityType;
+  direction: EntitySearchDirection;
+  relationTypeGroup: RelationTypeGroup;
+  maxLevel: number;
+}
+
+export interface EntityRelationsQuery {
+  parameters: RelationsSearchParameters;
+  filters: Array<EntityTypeFilter>;
+}
+
+export interface EntityRelation {
+  from: EntityId;
+  to: EntityId;
+  type: string;
+  typeGroup: RelationTypeGroup;
+  additionalInfo?: any;
+}
+
+export interface EntityRelationInfo extends EntityRelation {
+  fromName: string;
+  toEntityTypeName?: string;
+  toName: string;
+  fromEntityTypeName?: string;
+}

@@ -1278,7 +1278,8 @@
         "any-relation": "Any relation",
         "relation-filters": "Relation filters",
         "additional-info": "Additional info (JSON)",
-        "invalid-additional-info": "Unable to parse additional info json."
+        "invalid-additional-info": "Unable to parse additional info json.",
+        "no-relations-text": "No relations found"
     },
     "rulechain": {
         "rulechain": "Rule chain",
@@ -1749,7 +1750,7 @@
             "tr_TR": "Turkish",
             "fa_IR": "Persian",
             "uk_UA": "Ukrainian",
-            "cs_CZ": "Czech"            
+            "cs_CZ": "Czech"
         }
     }
 }