1 /*
2  * Copyright (C) 2015 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 package com.android.messaging.datamodel.binding;
17 
18 /**
19  * A BindableData that's only used to be bound once. If the client needs to rebind, it needs
20  * to create a new instance of the BindableOnceData.
21  */
22 public abstract class BindableOnceData extends BindableData {
23     private boolean boundOnce = false;
24 
25     @Override
bind(final String bindingId)26     public void bind(final String bindingId) {
27         // Ensures that we can't re-bind again after the first binding.
28         if (boundOnce) {
29             throw new IllegalStateException();
30         }
31         super.bind(bindingId);
32         boundOnce = true;
33     }
34 
35     /**
36      * Checks if the instance is bound to anything.
37      */
38     @Override
isBound()39     public boolean isBound() {
40         return super.isBound();
41     }
42 }
43