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 */
16package 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 */
22public abstract class BindableOnceData extends BindableData {
23    private boolean boundOnce = false;
24
25    @Override
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
39    public boolean isBound() {
40        return super.isBound();
41    }
42}
43