1 /*
2  * Copyright (C) 2014 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.internal;
18 
19 import com.google.i18n.phonenumbers.Phonemetadata.PhoneNumberDesc;
20 
21 import java.util.regex.Matcher;
22 import java.util.regex.Pattern;
23 
24 /**
25  * Implementation of the matcher API using the regular expressions in the PhoneNumberDesc
26  * proto message to match numbers.
27  */
28 public final class RegexBasedMatcher implements MatcherApi {
create()29   public static MatcherApi create() {
30     return new RegexBasedMatcher();
31   }
32 
33   private final RegexCache regexCache = new RegexCache(100);
34 
RegexBasedMatcher()35   private RegexBasedMatcher() {}
36 
37   // @Override
matchNationalNumber(CharSequence number, PhoneNumberDesc numberDesc, boolean allowPrefixMatch)38   public boolean matchNationalNumber(CharSequence number, PhoneNumberDesc numberDesc,
39       boolean allowPrefixMatch) {
40     String nationalNumberPattern = numberDesc.getNationalNumberPattern();
41     // We don't want to consider it a prefix match when matching non-empty input against an empty
42     // pattern.
43     if (nationalNumberPattern.length() == 0) {
44       return false;
45     }
46     return match(number, regexCache.getPatternForRegex(nationalNumberPattern), allowPrefixMatch);
47   }
48 
match(CharSequence number, Pattern pattern, boolean allowPrefixMatch)49   private static boolean match(CharSequence number, Pattern pattern, boolean allowPrefixMatch) {
50     Matcher matcher = pattern.matcher(number);
51     if (!matcher.lookingAt()) {
52       return false;
53     } else {
54       return (matcher.matches()) ? true : allowPrefixMatch;
55     }
56   }
57 }
58