am a78240ba: AlarmManager: Reject non-olson timezones for targetSdk >= M

import android.os.RemoteException;

import android.os.UserHandle;

import android.os.WorkSource;

import android.text.TextUtils;

import libcore.util.ZoneInfoDB;

import java.io.IOException;

/**

 * This class provides access to the system alarm services.  These allow you

    private final IAlarmManager mService;

    private final boolean mAlwaysExact;

    private final int mTargetSdkVersion;

    /**

    AlarmManager(IAlarmManager service, Context ctx) {

        mService = service;

        final int sdkVersion = ctx.getApplicationInfo().targetSdkVersion;

        mAlwaysExact = (sdkVersion < Build.VERSION_CODES.KITKAT);

        mTargetSdkVersion = ctx.getApplicationInfo().targetSdkVersion;

        mAlwaysExact = (mTargetSdkVersion < Build.VERSION_CODES.KITKAT);

    }

    private long legacyExactLength() {

    }

    /**

     * Set the system default time zone.

     * Requires the permission android.permission.SET_TIME_ZONE.

     * Sets the system's persistent default time zone. This is the time zone for all apps, even

     * after a reboot. Use {@link java.util.TimeZone#setDefault} if you just want to change the

     * time zone within your app, and even then prefer to pass an explicit

     * {@link java.util.TimeZone} to APIs that require it rather than changing the time zone for

     * all threads.

     *

     * <p> On android M and above, it is an error to pass in a non-Olson timezone to this

     * function. Note that this is a bad idea on all Android releases because POSIX and

     * the {@code TimeZone} class have opposite interpretations of {@code '+'} and {@code '-'}

     * in the same non-Olson ID.

     *

     * @param timeZone in the format understood by {@link java.util.TimeZone}

     * @param timeZone one of the Olson ids from the list returned by

     *     {@link java.util.TimeZone#getAvailableIDs}

     */

    public void setTimeZone(String timeZone) {

        if (TextUtils.isEmpty(timeZone)) {

            return;

        }

        // Reject this timezone if it isn't an Olson zone we recognize.

        if (mTargetSdkVersion >= Build.VERSION_CODES.MNC) {

            boolean hasTimeZone = false;

            try {

                hasTimeZone = ZoneInfoDB.getInstance().hasTimeZone(timeZone);

            } catch (IOException ignored) {

            }

            if (!hasTimeZone) {

                throw new IllegalArgumentException("Timezone: " + timeZone + " is not an Olson ID");

            }

        }

        try {

            mService.setTimeZone(timeZone);

        } catch (RemoteException ex) {