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1/*
2 * Copyright (c) 2021 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 *     http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16class SynchedPropertyObjectTwoWay<C extends Object>
17  extends ObservedPropertyObjectAbstract<C>
18  implements ISinglePropertyChangeSubscriber<C> {
19
20  private linkedParentProperty_: ObservedPropertyObjectAbstract<C>;
21  private contentStoragelinkedParentProperty_: ObservedPropertyObjectAbstract<C>;
22
23  constructor(linkSource: ObservedPropertyObjectAbstract<C>,
24    owningChildView: IPropertySubscriber,
25    thisPropertyName: PropertyInfo,
26    contentStoragelinkedParentProperty?: ObservedPropertyObjectAbstract<C>) {
27    super(owningChildView, thisPropertyName);
28    this.linkedParentProperty_ = linkSource;
29    // register to the parent property
30    this.linkedParentProperty_.subscribeMe(this);
31    if (contentStoragelinkedParentProperty) {
32      this.contentStoragelinkedParentProperty_ = contentStoragelinkedParentProperty;
33    }
34    // register to the ObservedObject
35    ObservedObject.addOwningProperty(this.getObject(), this);
36  }
37
38  /*
39  like a destructor, need to call this before deleting
40  the property.
41  */
42  aboutToBeDeleted() {
43    // unregister from parent of this link
44    this.linkedParentProperty_.unlinkSuscriber(this.id__());
45
46    // unregister from the ObservedObject
47    ObservedObject.removeOwningProperty(this.getObject(), this);
48    super.aboutToBeDeleted();
49  }
50
51  private getObject(): C {
52    this.notifyPropertyRead();
53    return this.linkedParentProperty_.get();
54  }
55
56  private setObject(newValue: C): void {
57    this.linkedParentProperty_.set(newValue)
58  }
59
60  // this object is subscriber to ObservedObject
61  // will call this cb function when property has changed
62  hasChanged(newValue: C): void {
63    console.debug(`SynchedPropertyObjectTwoWay[${this.id__()}, '${this.info() || "unknown"}']: contained ObservedObject hasChanged'.`)
64    this.notifyHasChanged(this.getObject());
65  }
66
67
68
69  // get 'read through` from the ObservedProperty
70  public get(): C {
71    console.debug(`SynchedPropertyObjectTwoWay[${this.id__()}, '${this.info() || "unknown"}']: get`)
72    if (this.contentStoragelinkedParentProperty_) {
73      return this.contentStoragelinkedParentProperty_.get();
74    }
75    return this.getObject();
76  }
77
78  // set 'writes through` to the ObservedProperty
79  public set(newValue: C): void {
80    if (this.contentStoragelinkedParentProperty_) {
81      this.contentStoragelinkedParentProperty_.set(newValue);
82      return;
83    }
84    if (this.getObject() == newValue) {
85      console.debug(`SynchedPropertyObjectTwoWay[${this.id__()}IP, '${this.info() || "unknown"}']: set with unchanged value '${newValue}'- ignoring.`);
86      return;
87    }
88
89    console.debug(`SynchedPropertyObjectTwoWay[${this.id__()}, '${this.info() || "unknown"}']: set to newValue: '${newValue}'.`);
90
91    ObservedObject.removeOwningProperty(this.getObject(), this);
92    this.setObject(newValue);
93    ObservedObject.addOwningProperty(this.getObject(), this);
94
95    this.notifyHasChanged(newValue);
96  }
97
98  /**
99 * These functions are meant for use in connection with the App Stoage and
100 * business logic implementation.
101 * the created Link and Prop will update when 'this' property value
102 * changes.
103 */
104  public createLink(subscribeOwner?: IPropertySubscriber,
105    linkPropName?: PropertyInfo, contentStoragelinkedParentProperty?: ObservedPropertyObjectAbstract<C>): ObservedPropertyAbstract<C> {
106    return new SynchedPropertyObjectTwoWay(this, subscribeOwner, linkPropName, contentStoragelinkedParentProperty);
107  }
108  public createProp(subscribeOwner?: IPropertySubscriber,
109    linkPropName?: PropertyInfo, contentStoragelinkedParentProperty?: ObservedPropertyObjectAbstract<C>): ObservedPropertyAbstract<C> {
110    throw new Error("Creating a 'Prop' proerty is unsuppoeted for Object type prperty value.");
111  }
112
113}
114