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1 /*
2  * Copyright 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 /**
21  * An object passed through {@link Message#obj} on state machines
22  */
23 public abstract class HeadsetMessageObject {
24     /**
25      * Build a representation of this object in a {@link StringBuilder}
26      *
27      * @param builder {@link StringBuilder} provided to build the string
28      */
buildString(StringBuilder builder)29     public abstract void buildString(StringBuilder builder);
30 
31     @Override
toString()32     public String toString() {
33         StringBuilder builder = new StringBuilder();
34         buildString(builder);
35         return builder.toString();
36     }
37 }
38