1/*
2 * Copyright (C) 2016 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
17package android.car.hardware;
18
19import static java.lang.Integer.toHexString;
20
21import android.annotation.SystemApi;
22import android.os.Parcel;
23import android.os.Parcelable;
24
25import java.nio.charset.Charset;
26
27/**
28 * Stores values broken down by area for a vehicle property.
29 *
30 * @param <T> refer to Parcel#writeValue(Object) to get a list of all supported types. The class
31 * should be visible to framework as default class loader is being used here.
32 *
33 * @hide
34 */
35@SystemApi
36public class CarPropertyValue<T> implements Parcelable {
37
38    private final static Charset DEFAULT_CHARSET = Charset.forName("UTF-8");
39
40    private final int mPropertyId;
41    private final int mAreaId;
42    private final T mValue;
43
44    public CarPropertyValue(int propertyId, T value) {
45        this(propertyId, 0, value);
46    }
47
48    public CarPropertyValue(int propertyId, int areaId, T value) {
49        mPropertyId = propertyId;
50        mAreaId = areaId;
51        mValue = value;
52    }
53
54    @SuppressWarnings("unchecked")
55    public CarPropertyValue(Parcel in) {
56        mPropertyId = in.readInt();
57        mAreaId = in.readInt();
58        String valueClassName = in.readString();
59        Class<?> valueClass;
60        try {
61            valueClass = Class.forName(valueClassName);
62        } catch (ClassNotFoundException e) {
63            throw new IllegalArgumentException("Class not found: " + valueClassName);
64        }
65
66        if (String.class.equals(valueClass)) {
67            byte[] bytes = in.readBlob();
68            mValue = (T) new String(bytes, DEFAULT_CHARSET);
69        } else if (byte[].class.equals(valueClass)) {
70            mValue = (T) in.readBlob();
71        } else {
72            mValue = (T) in.readValue(valueClass.getClassLoader());
73        }
74    }
75
76    public static final Creator<CarPropertyValue> CREATOR = new Creator<CarPropertyValue>() {
77        @Override
78        public CarPropertyValue createFromParcel(Parcel in) {
79            return new CarPropertyValue(in);
80        }
81
82        @Override
83        public CarPropertyValue[] newArray(int size) {
84            return new CarPropertyValue[size];
85        }
86    };
87
88    @Override
89    public int describeContents() {
90        return 0;
91    }
92
93    @Override
94    public void writeToParcel(Parcel dest, int flags) {
95        dest.writeInt(mPropertyId);
96        dest.writeInt(mAreaId);
97
98        Class<?> valueClass = mValue == null ? null : mValue.getClass();
99        dest.writeString(valueClass == null ? null : valueClass.getName());
100
101        // Special handling for String and byte[] to mitigate transaction buffer limitations.
102        if (String.class.equals(valueClass)) {
103            dest.writeBlob(((String)mValue).getBytes(DEFAULT_CHARSET));
104        } else if (byte[].class.equals(valueClass)) {
105            dest.writeBlob((byte[]) mValue);
106        } else {
107            dest.writeValue(mValue);
108        }
109    }
110
111    public int getPropertyId() {
112        return mPropertyId;
113    }
114
115    public int getAreaId() {
116        return mAreaId;
117    }
118
119    public T getValue() {
120        return mValue;
121    }
122
123    @Override
124    public String toString() {
125        return "CarPropertyValue{" +
126                "mPropertyId=0x" + toHexString(mPropertyId) +
127                ", mAreaId=0x" + toHexString(mAreaId) +
128                ", mValue=" + mValue +
129                '}';
130    }
131}
132