Move TelephonyUtils to base/telephony

/*

 * Copyright (C) 2019 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 com.android.internal.telephony.util;

import android.annotation.NonNull;

import android.annotation.Nullable;

import android.content.Context;

import android.content.pm.ComponentInfo;

import android.content.pm.PackageManager;

import android.content.pm.ResolveInfo;

import android.os.Binder;

import android.os.RemoteException;

import android.os.SystemProperties;

import java.io.PrintWriter;

/**

 * This class provides various util functions

 */

public final class TelephonyUtils {

    public static boolean IS_USER = "user".equals(android.os.Build.TYPE);

    /**

     * Verify that caller holds {@link android.Manifest.permission#DUMP}.

     *

     * @return true if access should be granted.

     */

    public static boolean checkDumpPermission(Context context, String tag, PrintWriter pw) {

        if (context.checkCallingOrSelfPermission(android.Manifest.permission.DUMP)

                != PackageManager.PERMISSION_GRANTED) {

            pw.println("Permission Denial: can't dump " + tag + " from from pid="

                    + Binder.getCallingPid() + ", uid=" + Binder.getCallingUid()

                    + " due to missing android.permission.DUMP permission");

            return false;

        } else {

            return true;

        }

    }

    /** {@hide} */

    public static String emptyIfNull(@Nullable String str) {

        return str == null ? "" : str;

    }

    /** {@hide} */

    public static RuntimeException rethrowAsRuntimeException(RemoteException remoteException) {

        throw new RuntimeException(remoteException);

    }

    public static ComponentInfo getComponentInfo(@NonNull ResolveInfo resolveInfo) {

        if (resolveInfo.activityInfo != null) return resolveInfo.activityInfo;

        if (resolveInfo.serviceInfo != null) return resolveInfo.serviceInfo;

        if (resolveInfo.providerInfo != null) return resolveInfo.providerInfo;

        throw new IllegalStateException("Missing ComponentInfo!");

    }

    public static boolean IS_DEBUGGABLE =

            SystemProperties.getInt("ro.debuggable", 0) == 1;

}