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 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
