1 files changed, 124 insertions, 0 deletions
diff --git a/core/java/android/os/UserHandle.java b/core/java/android/os/UserHandle.java
new file mode 100644
index 0000000..577a8c6
--- /dev/null
+++ b/core/java/android/os/UserHandle.java
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+/*
+ * Copyright (C) 2011 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.os;
+
+/**
+ * Representation of a user on the device.
+ * @hide
+ */
+public final class UserHandle {
+    /**
+     * Range of IDs allocated for a user.
+     *
+     * @hide
+     */
+    public static final int PER_USER_RANGE = 100000;
+
+    /** A user id to indicate all users on the device */
+    public static final int USER_ALL = -1;
+
+    /** A user id to indicate the currently active user */
+    public static final int USER_CURRENT = -2;
+
+    /** A user id constant to indicate the "owner" user of the device */
+    public static final int USER_OWNER = 0;
+
+    /**
+     * Enable multi-user related side effects. Set this to false if there are problems with single
+     * user usecases.
+     * */
+    public static final boolean MU_ENABLED = true;
+
+    /**
+     * Checks to see if the user id is the same for the two uids, i.e., they belong to the same
+     * user.
+     * @hide
+     */
+    public static final boolean isSameUser(int uid1, int uid2) {
+        return getUserId(uid1) == getUserId(uid2);
+    }
+
+    /**
+     * Checks to see if both uids are referring to the same app id, ignoring the user id part of the
+     * uids.
+     * @param uid1 uid to compare
+     * @param uid2 other uid to compare
+     * @return whether the appId is the same for both uids
+     * @hide
+     */
+    public static final boolean isSameApp(int uid1, int uid2) {
+        return getAppId(uid1) == getAppId(uid2);
+    }
+
+    public static final boolean isIsolated(int uid) {
+        uid = getAppId(uid);
+        return uid >= Process.FIRST_ISOLATED_UID && uid <= Process.LAST_ISOLATED_UID;
+    }
+
+    public static boolean isApp(int uid) {
+        if (uid > 0) {
+            uid = UserHandle.getAppId(uid);
+            return uid >= Process.FIRST_APPLICATION_UID && uid <= Process.LAST_APPLICATION_UID;
+        } else {
+            return false;
+        }
+    }
+
+    /**
+     * Returns the user id for a given uid.
+     * @hide
+     */
+    public static final int getUserId(int uid) {
+        if (MU_ENABLED) {
+            return uid / PER_USER_RANGE;
+        } else {
+            return 0;
+        }
+    }
+
+    public static final int getCallingUserId() {
+        return getUserId(Binder.getCallingUid());
+    }
+
+    /**
+     * Returns the uid that is composed from the userId and the appId.
+     * @hide
+     */
+    public static final int getUid(int userId, int appId) {
+        if (MU_ENABLED) {
+            return userId * PER_USER_RANGE + (appId % PER_USER_RANGE);
+        } else {
+            return appId;
+        }
+    }
+
+    /**
+     * Returns the app id (or base uid) for a given uid, stripping out the user id from it.
+     * @hide
+     */
+    public static final int getAppId(int uid) {
+        return uid % PER_USER_RANGE;
+    }
+
+    /**
+     * Returns the user id of the current process
+     * @return user id of the current process
+     */
+    public static final int myUserId() {
+        return getUserId(Process.myUid());
+    }
+}