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/*
* Copyright (C) 2011 The Libphonenumber Authors
*
* 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.google.i18n.phonenumbers;
import com.google.i18n.phonenumbers.Phonemetadata.PhoneMetadata;
import com.google.i18n.phonenumbers.Phonemetadata.PhoneNumberDesc;
import java.util.regex.Pattern;
/*
* Utility for international short phone numbers, such as short codes and emergency numbers. Note
* most commercial short numbers are not handled here, but by the PhoneNumberUtil.
*
* @author Shaopeng Jia
*/
public class ShortNumberUtil {
private final PhoneNumberUtil phoneUtil;
public ShortNumberUtil() {
phoneUtil = PhoneNumberUtil.getInstance();
}
// @VisibleForTesting
ShortNumberUtil(PhoneNumberUtil util) {
phoneUtil = util;
}
/**
* Returns true if the number might be used to connect to an emergency service in the given
* region.
*
* This method takes into account cases where the number might contain formatting, or might have
* additional digits appended (when it is okay to do that in the region specified).
*
* @param number the phone number to test
* @param regionCode the region where the phone number is being dialed
* @return if the number might be used to connect to an emergency service in the given region.
*/
public boolean connectsToEmergencyNumber(String number, String regionCode) {
return matchesEmergencyNumberHelper(number, regionCode, true /* allows prefix match */);
}
/**
* Returns true if the number exactly matches an emergency service number in the given region.
*
* This method takes into account cases where the number might contain formatting, but doesn't
* allow additional digits to be appended.
*
* @param number the phone number to test
* @param regionCode the region where the phone number is being dialed
* @return if the number exactly matches an emergency services number in the given region.
*/
public boolean isEmergencyNumber(String number, String regionCode) {
return matchesEmergencyNumberHelper(number, regionCode, false /* doesn't allow prefix match */);
}
private boolean matchesEmergencyNumberHelper(String number, String regionCode,
boolean allowPrefixMatch) {
number = PhoneNumberUtil.extractPossibleNumber(number);
if (PhoneNumberUtil.PLUS_CHARS_PATTERN.matcher(number).lookingAt()) {
// Returns false if the number starts with a plus sign. We don't believe dialing the country
// code before emergency numbers (e.g. +1911) works, but later, if that proves to work, we can
// add additional logic here to handle it.
return false;
}
PhoneMetadata metadata = phoneUtil.getMetadataForRegion(regionCode);
if (metadata == null || !metadata.hasEmergency()) {
return false;
}
Pattern emergencyNumberPattern =
Pattern.compile(metadata.getEmergency().getNationalNumberPattern());
String normalizedNumber = PhoneNumberUtil.normalizeDigitsOnly(number);
// In Brazil, it is impossible to append additional digits to an emergency number to dial the
// number.
return (!allowPrefixMatch || regionCode.equals("BR"))
? emergencyNumberPattern.matcher(normalizedNumber).matches()
: emergencyNumberPattern.matcher(normalizedNumber).lookingAt();
}
}
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