UidRange.java revision 07ace0f6ccc6f6f44cfec03455b624ac9f604f86 
1/*
2 * Copyright (C) 2014 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.net;
18
19import static android.os.UserHandle.PER_USER_RANGE;
20
21import android.os.Parcel;
22import android.os.Parcelable;
23
24/**
25 * An inclusive range of UIDs.
26 *
27 * @hide
28 */
29public final class UidRange implements Parcelable {
30    public final int start;
31    public final int stop;
32
33    public UidRange(int startUid, int stopUid) {
34        if (startUid < 0) throw new IllegalArgumentException("Invalid start UID.");
35        if (stopUid < 0) throw new IllegalArgumentException("Invalid stop UID.");
36        if (startUid > stopUid) throw new IllegalArgumentException("Invalid UID range.");
37        start = startUid;
38        stop  = stopUid;
39    }
40
41    public static UidRange createForUser(int userId) {
42        return new UidRange(userId * PER_USER_RANGE, (userId + 1) * PER_USER_RANGE - 1);
43    }
44
45    public int getStartUser() {
46        return start / PER_USER_RANGE;
47    }
48
49    public boolean contains(int uid) {
50        return start <= uid && uid <= stop;
51    }
52
53    /**
54     * Returns the count of UIDs in this range.
55     */
56    public int count() {
57        return 1 + stop - start;
58    }
59
60    /**
61     * @return {@code true} if this range contains every UID contained by the {@param other} range.
62     */
63    public boolean containsRange(UidRange other) {
64        return start <= other.start && other.stop <= stop;
65    }
66
67    @Override
68    public int hashCode() {
69        int result = 17;
70        result = 31 * result + start;
71        result = 31 * result + stop;
72        return result;
73    }
74
75    @Override
76    public boolean equals(Object o) {
77        if (this == o) {
78            return true;
79        }
80        if (o instanceof UidRange) {
81            UidRange other = (UidRange) o;
82            return start == other.start && stop == other.stop;
83        }
84        return false;
85    }
86
87    @Override
88    public String toString() {
89        return start + "-" + stop;
90    }
91
92    // implement the Parcelable interface
93    @Override
94    public int describeContents() {
95        return 0;
96    }
97
98    @Override
99    public void writeToParcel(Parcel dest, int flags) {
100        dest.writeInt(start);
101        dest.writeInt(stop);
102    }
103
104    public static final Creator<UidRange> CREATOR =
105        new Creator<UidRange>() {
106            @Override
107            public UidRange createFromParcel(Parcel in) {
108                int start = in.readInt();
109                int stop = in.readInt();
110
111                return new UidRange(start, stop);
112            }
113            @Override
114            public UidRange[] newArray(int size) {
115                return new UidRange[size];
116            }
117    };
118}
119