core/java/android/app/timezonedetector/PhoneTimeZoneSuggestion.java - platform/frameworks/base - Git at Google

 /*
  * Copyright 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 android.app.timezonedetector;

 import android.annotation.IntDef;
 import android.annotation.NonNull;
 import android.annotation.Nullable;
 import android.annotation.SystemApi;
 import android.os.Parcel;
 import android.os.Parcelable;

 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
 import java.util.Objects;

 /**
  * A time zone suggestion from an identified telephony source, e.g. from MCC and NITZ information
  * associated with a specific radio.
  *
  * <p>The time zone ID can be {@code null} to indicate that the telephony source has entered an
  * "un-opinionated" state and any previous suggestions from that source are being withdrawn.
  * When not {@code null}, the value consists of a suggested time zone ID and metadata that can be
  * used to judge quality / certainty of the suggestion.
  *
  * <p>{@code matchType} must be set to {@link #MATCH_TYPE_NA} when {@code zoneId} is {@code null},
  * and one of the other {@code MATCH_TYPE_} values when it is not {@code null}.
  *
  * <p>{@code quality} must be set to {@link #QUALITY_NA} when {@code zoneId} is {@code null},
  * and one of the other {@code QUALITY_} values when it is not {@code null}.
  *
  * @hide
  */
 @SystemApi(client = SystemApi.Client.MODULE_LIBRARIES)
 public final class PhoneTimeZoneSuggestion implements Parcelable {

     /** @hide */
     @SystemApi(client = SystemApi.Client.MODULE_LIBRARIES)
     @NonNull
     public static final Creator<PhoneTimeZoneSuggestion> CREATOR =
             new Creator<PhoneTimeZoneSuggestion>() {
                 public PhoneTimeZoneSuggestion createFromParcel(Parcel in) {
                     return PhoneTimeZoneSuggestion.createFromParcel(in);
                 }

                 public PhoneTimeZoneSuggestion[] newArray(int size) {
                     return new PhoneTimeZoneSuggestion[size];
                 }
             };

     /**
      * Creates an empty time zone suggestion, i.e. one that will cancel previous suggestions with
      * the same {@code phoneId}.
      */
     @NonNull
     public static PhoneTimeZoneSuggestion createEmptySuggestion(
             int phoneId, @NonNull String debugInfo) {
         return new Builder(phoneId).addDebugInfo(debugInfo).build();
     }

     /** @hide */
     @IntDef({ MATCH_TYPE_NA, MATCH_TYPE_NETWORK_COUNTRY_ONLY, MATCH_TYPE_NETWORK_COUNTRY_AND_OFFSET,
             MATCH_TYPE_EMULATOR_ZONE_ID, MATCH_TYPE_TEST_NETWORK_OFFSET_ONLY })
     @Retention(RetentionPolicy.SOURCE)
     public @interface MatchType {}

     /** Used when match type is not applicable. */
     public static final int MATCH_TYPE_NA = 0;

     /**
      * Only the network country is known.
      */
     public static final int MATCH_TYPE_NETWORK_COUNTRY_ONLY = 2;

     /**
      * Both the network county and offset were known.
      */
     public static final int MATCH_TYPE_NETWORK_COUNTRY_AND_OFFSET = 3;

     /**
      * The device is running in an emulator and an NITZ signal was simulated containing an
      * Android extension with an explicit Olson ID.
      */
     public static final int MATCH_TYPE_EMULATOR_ZONE_ID = 4;

     /**
      * The phone is most likely running in a test network not associated with a country (this is
      * distinct from the country just not being known yet).
      * Historically, Android has just picked an arbitrary time zone with the correct offset when
      * on a test network.
      */
     public static final int MATCH_TYPE_TEST_NETWORK_OFFSET_ONLY = 5;

     /** @hide */
     @IntDef({ QUALITY_NA, QUALITY_SINGLE_ZONE, QUALITY_MULTIPLE_ZONES_WITH_SAME_OFFSET,
             QUALITY_MULTIPLE_ZONES_WITH_DIFFERENT_OFFSETS })
     @Retention(RetentionPolicy.SOURCE)
     public @interface Quality {}

     /** Used when quality is not applicable. */
     public static final int QUALITY_NA = 0;

     /** There is only one answer */
     public static final int QUALITY_SINGLE_ZONE = 1;

     /**
      * There are multiple answers, but they all shared the same offset / DST state at the time
      * the suggestion was created. i.e. it might be the wrong zone but the user won't notice
      * immediately if it is wrong.
      */
     public static final int QUALITY_MULTIPLE_ZONES_WITH_SAME_OFFSET = 2;

     /**
      * There are multiple answers with different offsets. The one given is just one possible.
      */
     public static final int QUALITY_MULTIPLE_ZONES_WITH_DIFFERENT_OFFSETS = 3;

     /**
      * The ID of the phone this suggestion is associated with. For multiple-sim devices this
      * helps to establish source so filtering / stickiness can be implemented.
      */
     private final int mPhoneId;

     /**
      * The suggestion. {@code null} means there is no current suggestion and any previous suggestion
      * should be forgotten.
      */
     @Nullable
     private final String mZoneId;

     /**
      * The type of "match" used to establish the time zone.
      */
     @MatchType
     private final int mMatchType;

     /**
      * A measure of the quality of the time zone suggestion, i.e. how confident one could be in
      * it.
      */
     @Quality
     private final int mQuality;

     /**
      * Free-form debug information about how the suggestion was derived. Used for debug only,
      * intentionally not used in equals(), etc.
      */
     @Nullable
     private List<String> mDebugInfo;

     private PhoneTimeZoneSuggestion(Builder builder) {
         mPhoneId = builder.mPhoneId;
         mZoneId = builder.mZoneId;
         mMatchType = builder.mMatchType;
         mQuality = builder.mQuality;
         mDebugInfo = builder.mDebugInfo != null ? new ArrayList<>(builder.mDebugInfo) : null;
     }

     @SuppressWarnings("unchecked")
     private static PhoneTimeZoneSuggestion createFromParcel(Parcel in) {
         // Use the Builder so we get validation during build().
         int phoneId = in.readInt();
         PhoneTimeZoneSuggestion suggestion = new Builder(phoneId)
                 .setZoneId(in.readString())
                 .setMatchType(in.readInt())
                 .setQuality(in.readInt())
                 .build();
         List<String> debugInfo = in.readArrayList(PhoneTimeZoneSuggestion.class.getClassLoader());
         if (debugInfo != null) {
             suggestion.addDebugInfo(debugInfo);
         }
         return suggestion;
     }

     @Override
     public void writeToParcel(@NonNull Parcel dest, int flags) {
         dest.writeInt(mPhoneId);
         dest.writeString(mZoneId);
         dest.writeInt(mMatchType);
         dest.writeInt(mQuality);
         dest.writeList(mDebugInfo);
     }

     @Override
     public int describeContents() {
         return 0;
     }

     /**
      * Returns an identifier for the source of this suggestion. When a device has several "phones",
      * i.e. sim slots or equivalent, it is used to identify which one.
      */
     public int getPhoneId() {
         return mPhoneId;
     }

     /**
      * Returns the suggested time zone Olson ID, e.g. "America/Los_Angeles". {@code null} means that
      * the caller is no longer sure what the current time zone is. See
      * {@link PhoneTimeZoneSuggestion} for the associated {@code matchType} / {@code quality} rules.
      */
     @Nullable
     public String getZoneId() {
         return mZoneId;
     }

     /**
      * Returns information about how the suggestion was determined which could be used to rank
      * suggestions when several are available from different sources. See
      * {@link PhoneTimeZoneSuggestion} for the associated rules.
      */
     @MatchType
     public int getMatchType() {
         return mMatchType;
     }

     /**
      * Returns information about the likelihood of the suggested zone being correct.  See
      * {@link PhoneTimeZoneSuggestion} for the associated rules.
      */
     @Quality
     public int getQuality() {
         return mQuality;
     }

     /**
      * Returns debug metadata for the suggestion. The information is present in {@link #toString()}
      * but is not considered for {@link #equals(Object)} and {@link #hashCode()}.
      */
     @NonNull
     public List<String> getDebugInfo() {
         return mDebugInfo == null
                 ? Collections.emptyList() : Collections.unmodifiableList(mDebugInfo);
     }

     /**
      * Associates information with the instance that can be useful for debugging / logging. The
      * information is present in {@link #toString()} but is not considered for
      * {@link #equals(Object)} and {@link #hashCode()}.
      */
     public void addDebugInfo(@NonNull String debugInfo) {
         if (mDebugInfo == null) {
             mDebugInfo = new ArrayList<>();
         }
         mDebugInfo.add(debugInfo);
     }

     /**
      * Associates information with the instance that can be useful for debugging / logging. The
      * information is present in {@link #toString()} but is not considered for
      * {@link #equals(Object)} and {@link #hashCode()}.
      */
     public void addDebugInfo(@NonNull List<String> debugInfo) {
         if (mDebugInfo == null) {
             mDebugInfo = new ArrayList<>(debugInfo.size());
         }
         mDebugInfo.addAll(debugInfo);
     }

     @Override
     public boolean equals(Object o) {
         if (this == o) {
             return true;
         }
         if (o == null || getClass() != o.getClass()) {
             return false;
         }
         PhoneTimeZoneSuggestion that = (PhoneTimeZoneSuggestion) o;
         return mPhoneId == that.mPhoneId
                 && mMatchType == that.mMatchType
                 && mQuality == that.mQuality
                 && Objects.equals(mZoneId, that.mZoneId);
     }

     @Override
     public int hashCode() {
         return Objects.hash(mPhoneId, mZoneId, mMatchType, mQuality);
     }

     @Override
     public String toString() {
         return "PhoneTimeZoneSuggestion{"
                 + "mPhoneId=" + mPhoneId
                 + ", mZoneId='" + mZoneId + '\''
                 + ", mMatchType=" + mMatchType
                 + ", mQuality=" + mQuality
                 + ", mDebugInfo=" + mDebugInfo
                 + '}';
     }

     /**
      * Builds {@link PhoneTimeZoneSuggestion} instances.
      *
      * @hide
      */
     @SystemApi(client = SystemApi.Client.MODULE_LIBRARIES)
     public static final class Builder {
         private final int mPhoneId;
         @Nullable private String mZoneId;
         @MatchType private int mMatchType;
         @Quality private int mQuality;
         @Nullable private List<String> mDebugInfo;

         public Builder(int phoneId) {
             mPhoneId = phoneId;
         }

         /**
          * Returns the builder for call chaining.
          */
         @NonNull
         public Builder setZoneId(@Nullable String zoneId) {
             mZoneId = zoneId;
             return this;
         }

         /** Returns the builder for call chaining. */
         @NonNull
         public Builder setMatchType(@MatchType int matchType) {
             mMatchType = matchType;
             return this;
         }

         /** Returns the builder for call chaining. */
         @NonNull
         public Builder setQuality(@Quality int quality) {
             mQuality = quality;
             return this;
         }

         /** Returns the builder for call chaining. */
         @NonNull
         public Builder addDebugInfo(@NonNull String debugInfo) {
             if (mDebugInfo == null) {
                 mDebugInfo = new ArrayList<>();
             }
             mDebugInfo.add(debugInfo);
             return this;
         }

         /**
          * Performs basic structural validation of this instance. e.g. Are all the fields populated
          * that must be? Are the enum ints set to valid values?
          */
         void validate() {
             int quality = mQuality;
             int matchType = mMatchType;
             if (mZoneId == null) {
                 if (quality != QUALITY_NA || matchType != MATCH_TYPE_NA) {
                     throw new RuntimeException("Invalid quality or match type for null zone ID."
                             + " quality=" + quality + ", matchType=" + matchType);
                 }
             } else {
                 boolean qualityValid = (quality == QUALITY_SINGLE_ZONE
                         || quality == QUALITY_MULTIPLE_ZONES_WITH_SAME_OFFSET
                         || quality == QUALITY_MULTIPLE_ZONES_WITH_DIFFERENT_OFFSETS);
                 boolean matchTypeValid = (matchType == MATCH_TYPE_NETWORK_COUNTRY_ONLY
                         || matchType == MATCH_TYPE_NETWORK_COUNTRY_AND_OFFSET
                         || matchType == MATCH_TYPE_EMULATOR_ZONE_ID
                         || matchType == MATCH_TYPE_TEST_NETWORK_OFFSET_ONLY);
                 if (!qualityValid || !matchTypeValid) {
                     throw new RuntimeException("Invalid quality or match type with zone ID."
                             + " quality=" + quality + ", matchType=" + matchType);
                 }
             }
         }

         /** Returns the {@link PhoneTimeZoneSuggestion}. */
         @NonNull
         public PhoneTimeZoneSuggestion build() {
             validate();
             return new PhoneTimeZoneSuggestion(this);
         }
     }
 }
	/*
	* Copyright 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 android.app.timezonedetector;

	import android.annotation.IntDef;
	import android.annotation.NonNull;
	import android.annotation.Nullable;
	import android.annotation.SystemApi;
	import android.os.Parcel;
	import android.os.Parcelable;

	import java.lang.annotation.Retention;
	import java.lang.annotation.RetentionPolicy;
	import java.util.ArrayList;
	import java.util.Collections;
	import java.util.List;
	import java.util.Objects;

	/**
	* A time zone suggestion from an identified telephony source, e.g. from MCC and NITZ information
	* associated with a specific radio.
	*
	* <p>The time zone ID can be {@code null} to indicate that the telephony source has entered an
	* "un-opinionated" state and any previous suggestions from that source are being withdrawn.
	* When not {@code null}, the value consists of a suggested time zone ID and metadata that can be
	* used to judge quality / certainty of the suggestion.
	*
	* <p>{@code matchType} must be set to {@link #MATCH_TYPE_NA} when {@code zoneId} is {@code null},
	* and one of the other {@code MATCH_TYPE_} values when it is not {@code null}.
	*
	* <p>{@code quality} must be set to {@link #QUALITY_NA} when {@code zoneId} is {@code null},
	* and one of the other {@code QUALITY_} values when it is not {@code null}.
	*
	* @hide
	*/
	@SystemApi(client = SystemApi.Client.MODULE_LIBRARIES)
	public final class PhoneTimeZoneSuggestion implements Parcelable {

	/** @hide */
	@SystemApi(client = SystemApi.Client.MODULE_LIBRARIES)
	@NonNull
	public static final Creator<PhoneTimeZoneSuggestion> CREATOR =
	new Creator<PhoneTimeZoneSuggestion>() {
	public PhoneTimeZoneSuggestion createFromParcel(Parcel in) {
	return PhoneTimeZoneSuggestion.createFromParcel(in);
	}

	public PhoneTimeZoneSuggestion[] newArray(int size) {
	return new PhoneTimeZoneSuggestion[size];
	}
	};

	/**
	* Creates an empty time zone suggestion, i.e. one that will cancel previous suggestions with
	* the same {@code phoneId}.
	*/
	@NonNull
	public static PhoneTimeZoneSuggestion createEmptySuggestion(
	int phoneId, @NonNull String debugInfo) {
	return new Builder(phoneId).addDebugInfo(debugInfo).build();
	}

	/** @hide */
	@IntDef({ MATCH_TYPE_NA, MATCH_TYPE_NETWORK_COUNTRY_ONLY, MATCH_TYPE_NETWORK_COUNTRY_AND_OFFSET,
	MATCH_TYPE_EMULATOR_ZONE_ID, MATCH_TYPE_TEST_NETWORK_OFFSET_ONLY })
	@Retention(RetentionPolicy.SOURCE)
	public @interface MatchType {}

	/** Used when match type is not applicable. */
	public static final int MATCH_TYPE_NA = 0;

	/**
	* Only the network country is known.
	*/
	public static final int MATCH_TYPE_NETWORK_COUNTRY_ONLY = 2;

	/**
	* Both the network county and offset were known.
	*/
	public static final int MATCH_TYPE_NETWORK_COUNTRY_AND_OFFSET = 3;

	/**
	* The device is running in an emulator and an NITZ signal was simulated containing an
	* Android extension with an explicit Olson ID.
	*/
	public static final int MATCH_TYPE_EMULATOR_ZONE_ID = 4;

	/**
	* The phone is most likely running in a test network not associated with a country (this is
	* distinct from the country just not being known yet).
	* Historically, Android has just picked an arbitrary time zone with the correct offset when
	* on a test network.
	*/
	public static final int MATCH_TYPE_TEST_NETWORK_OFFSET_ONLY = 5;

	/** @hide */
	@IntDef({ QUALITY_NA, QUALITY_SINGLE_ZONE, QUALITY_MULTIPLE_ZONES_WITH_SAME_OFFSET,
	QUALITY_MULTIPLE_ZONES_WITH_DIFFERENT_OFFSETS })
	@Retention(RetentionPolicy.SOURCE)
	public @interface Quality {}

	/** Used when quality is not applicable. */
	public static final int QUALITY_NA = 0;

	/** There is only one answer */
	public static final int QUALITY_SINGLE_ZONE = 1;

	/**
	* There are multiple answers, but they all shared the same offset / DST state at the time
	* the suggestion was created. i.e. it might be the wrong zone but the user won't notice
	* immediately if it is wrong.
	*/
	public static final int QUALITY_MULTIPLE_ZONES_WITH_SAME_OFFSET = 2;

	/**
	* There are multiple answers with different offsets. The one given is just one possible.
	*/
	public static final int QUALITY_MULTIPLE_ZONES_WITH_DIFFERENT_OFFSETS = 3;

	/**
	* The ID of the phone this suggestion is associated with. For multiple-sim devices this
	* helps to establish source so filtering / stickiness can be implemented.
	*/
	private final int mPhoneId;

	/**
	* The suggestion. {@code null} means there is no current suggestion and any previous suggestion
	* should be forgotten.
	*/
	@Nullable
	private final String mZoneId;

	/**
	* The type of "match" used to establish the time zone.
	*/
	@MatchType
	private final int mMatchType;

	/**
	* A measure of the quality of the time zone suggestion, i.e. how confident one could be in
	* it.
	*/
	@Quality
	private final int mQuality;

	/**
	* Free-form debug information about how the suggestion was derived. Used for debug only,
	* intentionally not used in equals(), etc.
	*/
	@Nullable
	private List<String> mDebugInfo;

	private PhoneTimeZoneSuggestion(Builder builder) {
	mPhoneId = builder.mPhoneId;
	mZoneId = builder.mZoneId;
	mMatchType = builder.mMatchType;
	mQuality = builder.mQuality;
	mDebugInfo = builder.mDebugInfo != null ? new ArrayList<>(builder.mDebugInfo) : null;
	}

	@SuppressWarnings("unchecked")
	private static PhoneTimeZoneSuggestion createFromParcel(Parcel in) {
	// Use the Builder so we get validation during build().
	int phoneId = in.readInt();
	PhoneTimeZoneSuggestion suggestion = new Builder(phoneId)
	.setZoneId(in.readString())
	.setMatchType(in.readInt())
	.setQuality(in.readInt())
	.build();
	List<String> debugInfo = in.readArrayList(PhoneTimeZoneSuggestion.class.getClassLoader());
	if (debugInfo != null) {
	suggestion.addDebugInfo(debugInfo);
	}
	return suggestion;
	}

	@Override
	public void writeToParcel(@NonNull Parcel dest, int flags) {
	dest.writeInt(mPhoneId);
	dest.writeString(mZoneId);
	dest.writeInt(mMatchType);
	dest.writeInt(mQuality);
	dest.writeList(mDebugInfo);
	}

	@Override
	public int describeContents() {
	return 0;
	}

	/**
	* Returns an identifier for the source of this suggestion. When a device has several "phones",
	* i.e. sim slots or equivalent, it is used to identify which one.
	*/
	public int getPhoneId() {
	return mPhoneId;
	}

	/**
	* Returns the suggested time zone Olson ID, e.g. "America/Los_Angeles". {@code null} means that
	* the caller is no longer sure what the current time zone is. See
	* {@link PhoneTimeZoneSuggestion} for the associated {@code matchType} / {@code quality} rules.
	*/
	@Nullable
	public String getZoneId() {
	return mZoneId;
	}

	/**
	* Returns information about how the suggestion was determined which could be used to rank
	* suggestions when several are available from different sources. See
	* {@link PhoneTimeZoneSuggestion} for the associated rules.
	*/
	@MatchType
	public int getMatchType() {
	return mMatchType;
	}

	/**
	* Returns information about the likelihood of the suggested zone being correct. See
	* {@link PhoneTimeZoneSuggestion} for the associated rules.
	*/
	@Quality
	public int getQuality() {
	return mQuality;
	}

	/**
	* Returns debug metadata for the suggestion. The information is present in {@link #toString()}
	* but is not considered for {@link #equals(Object)} and {@link #hashCode()}.
	*/
	@NonNull
	public List<String> getDebugInfo() {
	return mDebugInfo == null
	? Collections.emptyList() : Collections.unmodifiableList(mDebugInfo);
	}

	/**
	* Associates information with the instance that can be useful for debugging / logging. The
	* information is present in {@link #toString()} but is not considered for
	* {@link #equals(Object)} and {@link #hashCode()}.
	*/
	public void addDebugInfo(@NonNull String debugInfo) {
	if (mDebugInfo == null) {
	mDebugInfo = new ArrayList<>();
	}
	mDebugInfo.add(debugInfo);
	}

	/**
	* Associates information with the instance that can be useful for debugging / logging. The
	* information is present in {@link #toString()} but is not considered for
	* {@link #equals(Object)} and {@link #hashCode()}.
	*/
	public void addDebugInfo(@NonNull List<String> debugInfo) {
	if (mDebugInfo == null) {
	mDebugInfo = new ArrayList<>(debugInfo.size());
	}
	mDebugInfo.addAll(debugInfo);
	}

	@Override
	public boolean equals(Object o) {
	if (this == o) {
	return true;
	}
	if (o == null \|\| getClass() != o.getClass()) {
	return false;
	}
	PhoneTimeZoneSuggestion that = (PhoneTimeZoneSuggestion) o;
	return mPhoneId == that.mPhoneId
	&& mMatchType == that.mMatchType
	&& mQuality == that.mQuality
	&& Objects.equals(mZoneId, that.mZoneId);
	}

	@Override
	public int hashCode() {
	return Objects.hash(mPhoneId, mZoneId, mMatchType, mQuality);
	}

	@Override
	public String toString() {
	return "PhoneTimeZoneSuggestion{"
	+ "mPhoneId=" + mPhoneId
	+ ", mZoneId='" + mZoneId + '\''
	+ ", mMatchType=" + mMatchType
	+ ", mQuality=" + mQuality
	+ ", mDebugInfo=" + mDebugInfo
	+ '}';
	}

	/**
	* Builds {@link PhoneTimeZoneSuggestion} instances.
	*
	* @hide
	*/
	@SystemApi(client = SystemApi.Client.MODULE_LIBRARIES)
	public static final class Builder {
	private final int mPhoneId;
	@Nullable private String mZoneId;
	@MatchType private int mMatchType;
	@Quality private int mQuality;
	@Nullable private List<String> mDebugInfo;

	public Builder(int phoneId) {
	mPhoneId = phoneId;
	}

	/**
	* Returns the builder for call chaining.
	*/
	@NonNull
	public Builder setZoneId(@Nullable String zoneId) {
	mZoneId = zoneId;
	return this;
	}

	/** Returns the builder for call chaining. */
	@NonNull
	public Builder setMatchType(@MatchType int matchType) {
	mMatchType = matchType;
	return this;
	}

	/** Returns the builder for call chaining. */
	@NonNull
	public Builder setQuality(@Quality int quality) {
	mQuality = quality;
	return this;
	}

	/** Returns the builder for call chaining. */
	@NonNull
	public Builder addDebugInfo(@NonNull String debugInfo) {
	if (mDebugInfo == null) {
	mDebugInfo = new ArrayList<>();
	}
	mDebugInfo.add(debugInfo);
	return this;
	}

	/**
	* Performs basic structural validation of this instance. e.g. Are all the fields populated
	* that must be? Are the enum ints set to valid values?
	*/
	void validate() {
	int quality = mQuality;
	int matchType = mMatchType;
	if (mZoneId == null) {
	if (quality != QUALITY_NA \|\| matchType != MATCH_TYPE_NA) {
	throw new RuntimeException("Invalid quality or match type for null zone ID."
	+ " quality=" + quality + ", matchType=" + matchType);
	}
	} else {
	boolean qualityValid = (quality == QUALITY_SINGLE_ZONE
	\|\| quality == QUALITY_MULTIPLE_ZONES_WITH_SAME_OFFSET
	\|\| quality == QUALITY_MULTIPLE_ZONES_WITH_DIFFERENT_OFFSETS);
	boolean matchTypeValid = (matchType == MATCH_TYPE_NETWORK_COUNTRY_ONLY
	\|\| matchType == MATCH_TYPE_NETWORK_COUNTRY_AND_OFFSET
	\|\| matchType == MATCH_TYPE_EMULATOR_ZONE_ID
	\|\| matchType == MATCH_TYPE_TEST_NETWORK_OFFSET_ONLY);
	if (!qualityValid \|\| !matchTypeValid) {
	throw new RuntimeException("Invalid quality or match type with zone ID."
	+ " quality=" + quality + ", matchType=" + matchType);
	}
	}
	}

	/** Returns the {@link PhoneTimeZoneSuggestion}. */
	@NonNull
	public PhoneTimeZoneSuggestion build() {
	validate();
	return new PhoneTimeZoneSuggestion(this);
	}
	}
	}