1 /* 2 * Copyright (C) 2018 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.bluetooth.hfp; 17 18 import android.os.Message; 19 20 /** An object passed through {@link Message#obj} on state machines */ 21 public abstract class HeadsetMessageObject { 22 /** 23 * Build a representation of this object in a {@link StringBuilder} 24 * 25 * @param builder {@link StringBuilder} provided to build the string 26 */ buildString(StringBuilder builder)27 public abstract void buildString(StringBuilder builder); 28 29 @Override toString()30 public String toString() { 31 StringBuilder builder = new StringBuilder(); 32 buildString(builder); 33 return builder.toString(); 34 } 35 } 36