Narayan Kamath | a77fadd | 2014-12-18 11:56:40 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2012 The Libphonenumber Authors |
| 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 | |
| 17 | package com.google.i18n.phonenumbers; |
| 18 | |
| 19 | import com.google.i18n.phonenumbers.PhoneNumberUtil.PhoneNumberType; |
| 20 | import com.google.i18n.phonenumbers.Phonenumber.PhoneNumber; |
| 21 | import com.google.i18n.phonenumbers.prefixmapper.PrefixTimeZonesMap; |
| 22 | |
| 23 | import java.io.IOException; |
| 24 | import java.io.InputStream; |
| 25 | import java.io.ObjectInputStream; |
| 26 | import java.util.ArrayList; |
| 27 | import java.util.Collections; |
| 28 | import java.util.List; |
| 29 | import java.util.logging.Level; |
| 30 | import java.util.logging.Logger; |
| 31 | |
| 32 | /** |
| 33 | * An offline mapper from phone numbers to time zones. |
| 34 | */ |
| 35 | public class PhoneNumberToTimeZonesMapper { |
| 36 | private static PhoneNumberToTimeZonesMapper instance = null; |
| 37 | private static final String MAPPING_DATA_DIRECTORY = |
| 38 | "/com/google/i18n/phonenumbers/timezones/data/"; |
| 39 | private static final String MAPPING_DATA_FILE_NAME = "map_data"; |
| 40 | // This is defined by ICU as the unknown time zone. |
| 41 | private static final String UNKNOWN_TIMEZONE = "Etc/Unknown"; |
| 42 | // A list with the ICU unknown time zone as single element. |
| 43 | // @VisibleForTesting |
| 44 | static final List<String> UNKNOWN_TIME_ZONE_LIST = new ArrayList<String>(1); |
| 45 | static { |
| 46 | UNKNOWN_TIME_ZONE_LIST.add(UNKNOWN_TIMEZONE); |
| 47 | } |
| 48 | |
| 49 | private static final Logger LOGGER = |
| 50 | Logger.getLogger(PhoneNumberToTimeZonesMapper.class.getName()); |
| 51 | |
| 52 | private PrefixTimeZonesMap prefixTimeZonesMap = null; |
| 53 | |
| 54 | // @VisibleForTesting |
| 55 | PhoneNumberToTimeZonesMapper(String prefixTimeZonesMapDataDirectory) { |
| 56 | this.prefixTimeZonesMap = loadPrefixTimeZonesMapFromFile( |
| 57 | prefixTimeZonesMapDataDirectory + MAPPING_DATA_FILE_NAME); |
| 58 | } |
| 59 | |
| 60 | private PhoneNumberToTimeZonesMapper(PrefixTimeZonesMap prefixTimeZonesMap) { |
| 61 | this.prefixTimeZonesMap = prefixTimeZonesMap; |
| 62 | } |
| 63 | |
| 64 | private static PrefixTimeZonesMap loadPrefixTimeZonesMapFromFile(String path) { |
| 65 | InputStream source = PhoneNumberToTimeZonesMapper.class.getResourceAsStream(path); |
| 66 | ObjectInputStream in = null; |
| 67 | PrefixTimeZonesMap map = new PrefixTimeZonesMap(); |
| 68 | try { |
| 69 | in = new ObjectInputStream(source); |
| 70 | map.readExternal(in); |
| 71 | } catch (IOException e) { |
| 72 | LOGGER.log(Level.WARNING, e.toString()); |
| 73 | } finally { |
| 74 | close(in); |
| 75 | } |
| 76 | return map; |
| 77 | } |
| 78 | |
| 79 | private static void close(InputStream in) { |
| 80 | if (in != null) { |
| 81 | try { |
| 82 | in.close(); |
| 83 | } catch (IOException e) { |
| 84 | LOGGER.log(Level.WARNING, e.toString()); |
| 85 | } |
| 86 | } |
| 87 | } |
| 88 | |
| 89 | /** |
| 90 | * Helper class used for lazy instantiation of a PhoneNumberToTimeZonesMapper. This also loads the |
| 91 | * map data in a thread-safe way. |
| 92 | */ |
| 93 | private static class LazyHolder { |
| 94 | private static final PhoneNumberToTimeZonesMapper INSTANCE; |
| 95 | static { |
| 96 | PrefixTimeZonesMap map = |
| 97 | loadPrefixTimeZonesMapFromFile(MAPPING_DATA_DIRECTORY + MAPPING_DATA_FILE_NAME); |
| 98 | INSTANCE = new PhoneNumberToTimeZonesMapper(map); |
| 99 | } |
| 100 | } |
| 101 | |
| 102 | /** |
| 103 | * Gets a {@link PhoneNumberToTimeZonesMapper} instance. |
| 104 | * |
| 105 | * <p> The {@link PhoneNumberToTimeZonesMapper} is implemented as a singleton. Therefore, calling |
| 106 | * this method multiple times will only result in one instance being created. |
| 107 | * |
| 108 | * @return a {@link PhoneNumberToTimeZonesMapper} instance |
| 109 | */ |
| 110 | public static synchronized PhoneNumberToTimeZonesMapper getInstance() { |
| 111 | return LazyHolder.INSTANCE; |
| 112 | } |
| 113 | |
| 114 | /** |
| 115 | * Returns a list of time zones to which a phone number belongs. |
| 116 | * |
| 117 | * <p>This method assumes the validity of the number passed in has already been checked, and that |
| 118 | * the number is geo-localizable. We consider fixed-line and mobile numbers possible candidates |
| 119 | * for geo-localization. |
| 120 | * |
| 121 | * @param number a valid phone number for which we want to get the time zones to which it belongs |
| 122 | * @return a list of the corresponding time zones or a single element list with the default |
| 123 | * unknown time zone if no other time zone was found or if the number was invalid |
| 124 | */ |
| 125 | public List<String> getTimeZonesForGeographicalNumber(PhoneNumber number) { |
| 126 | return getTimeZonesForGeocodableNumber(number); |
| 127 | } |
| 128 | |
| 129 | /** |
| 130 | * As per {@link #getTimeZonesForGeographicalNumber(PhoneNumber)} but explicitly checks |
| 131 | * the validity of the number passed in. |
| 132 | * |
| 133 | * @param number the phone number for which we want to get the time zones to which it belongs |
| 134 | * @return a list of the corresponding time zones or a single element list with the default |
| 135 | * unknown time zone if no other time zone was found or if the number was invalid |
| 136 | */ |
| 137 | public List<String> getTimeZonesForNumber(PhoneNumber number) { |
| 138 | PhoneNumberType numberType = PhoneNumberUtil.getInstance().getNumberType(number); |
| 139 | if (numberType == PhoneNumberType.UNKNOWN) { |
| 140 | return UNKNOWN_TIME_ZONE_LIST; |
| 141 | } else if (!canBeGeocoded(numberType)) { |
| 142 | return getCountryLevelTimeZonesforNumber(number); |
| 143 | } |
| 144 | return getTimeZonesForGeographicalNumber(number); |
| 145 | } |
| 146 | |
| 147 | /** |
| 148 | * A similar method is implemented as PhoneNumberUtil.isNumberGeographical, which performs a |
| 149 | * stricter check, as it determines if a number has a geographical association. Also, if new |
| 150 | * phone number types were added, we should check if this other method should be updated too. |
| 151 | * TODO: Remove duplication by completing the logic in the method in PhoneNumberUtil. |
| 152 | * For more information, see the comments in that method. |
| 153 | */ |
| 154 | private boolean canBeGeocoded(PhoneNumberType numberType) { |
| 155 | return (numberType == PhoneNumberType.FIXED_LINE || |
| 156 | numberType == PhoneNumberType.MOBILE || |
| 157 | numberType == PhoneNumberType.FIXED_LINE_OR_MOBILE); |
| 158 | } |
| 159 | |
| 160 | /** |
| 161 | * Returns a String with the ICU unknown time zone. |
| 162 | */ |
| 163 | public static String getUnknownTimeZone() { |
| 164 | return UNKNOWN_TIMEZONE; |
| 165 | } |
| 166 | |
| 167 | /** |
| 168 | * Returns a list of time zones to which a geocodable phone number belongs. |
| 169 | * |
| 170 | * @param number the phone number for which we want to get the time zones to which it belongs |
| 171 | * @return the list of corresponding time zones or a single element list with the default |
| 172 | * unknown time zone if no other time zone was found or if the number was invalid |
| 173 | */ |
| 174 | private List<String> getTimeZonesForGeocodableNumber(PhoneNumber number) { |
| 175 | List<String> timezones = prefixTimeZonesMap.lookupTimeZonesForNumber(number); |
| 176 | return Collections.unmodifiableList(timezones.isEmpty() ? UNKNOWN_TIME_ZONE_LIST |
| 177 | : timezones); |
| 178 | } |
| 179 | |
| 180 | /** |
| 181 | * Returns the list of time zones corresponding to the country calling code of {@code number}. |
| 182 | * |
| 183 | * @param number the phone number to look up |
| 184 | * @return the list of corresponding time zones or a single element list with the default |
| 185 | * unknown time zone if no other time zone was found |
| 186 | */ |
| 187 | private List<String> getCountryLevelTimeZonesforNumber(PhoneNumber number) { |
| 188 | List<String> timezones = prefixTimeZonesMap.lookupCountryLevelTimeZonesForNumber(number); |
| 189 | return Collections.unmodifiableList(timezones.isEmpty() ? UNKNOWN_TIME_ZONE_LIST |
| 190 | : timezones); |
| 191 | } |
| 192 | } |