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/*
* Copyright (C) 2017 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 com.android.dialer.searchfragment.common;
import android.support.annotation.NonNull;
import android.telephony.PhoneNumberUtils;
import android.text.TextUtils;
import java.util.regex.Pattern;
/** Utility class for filtering, comparing and handling strings and queries. */
public class QueryFilteringUtil {
/** Matches strings with "-", "(", ")", 2-9 of at least length one. */
private static final Pattern T9_PATTERN = Pattern.compile("[\\-()2-9]+");
/**
* Returns true if the query is of T9 format and the name's T9 representation belongs to the query
*
* <p>Examples:
*
* <ul>
* <li>#nameMatchesT9Query("7", "John Smith") returns true, 7 -> 'S'
* <li>#nameMatchesT9Query("55", "Jessica Jones") returns true, 55 -> 'JJ'
* <li>#nameMatchesT9Query("56", "Jessica Jones") returns true, 56 -> 'Jo'
* <li>#nameMatchesT9Query("7", "Jessica Jones") returns false, no names start with P,Q,R or S
* </ul>
*/
public static boolean nameMatchesT9Query(String query, String name) {
if (!T9_PATTERN.matcher(query).matches()) {
return false;
}
query = digitsOnly(query);
Pattern pattern = Pattern.compile("(^|\\s)" + Pattern.quote(query));
if (pattern.matcher(getT9Representation(name)).find()) {
// query matches the start of a T9 name (i.e. 75 -> "Jessica [Jo]nes")
return true;
}
// Check matches initials
// TODO(calderwoodra) investigate faster implementation
int queryIndex = 0;
String[] names = name.toLowerCase().split("\\s");
for (int i = 0; i < names.length && queryIndex < query.length(); i++) {
if (TextUtils.isEmpty(names[i])) {
continue;
}
if (getDigit(names[i].charAt(0)) == query.charAt(queryIndex)) {
queryIndex++;
}
}
return queryIndex == query.length();
}
/**
* Returns true if the subparts of the name (split by white space) begin with the query.
*
* <p>Examples:
*
* <ul>
* <li>#nameContainsQuery("b", "Brandon") returns true
* <li>#nameContainsQuery("o", "Bob") returns false
* <li>#nameContainsQuery("o", "Bob Olive") returns true
* </ul>
*/
public static boolean nameContainsQuery(String query, String name) {
return Pattern.compile("(^|\\s)" + Pattern.quote(query.toLowerCase()))
.matcher(name.toLowerCase())
.find();
}
/** @return true if the number belongs to the query. */
public static boolean numberMatchesNumberQuery(String query, String number) {
return PhoneNumberUtils.isGlobalPhoneNumber(query)
&& indexOfQueryNonDigitsIgnored(query, number) != -1;
}
/**
* Checks if query is contained in number while ignoring all characters in both that are not
* digits (i.e. {@link Character#isDigit(char)} returns false).
*
* @return index where query is found with all non-digits removed, -1 if it's not found.
*/
static int indexOfQueryNonDigitsIgnored(@NonNull String query, @NonNull String number) {
return digitsOnly(number).indexOf(digitsOnly(query));
}
// Returns string with letters replaced with their T9 representation.
static String getT9Representation(String s) {
StringBuilder builder = new StringBuilder(s.length());
for (char c : s.toLowerCase().toCharArray()) {
builder.append(getDigit(c));
}
return builder.toString();
}
/** @return String s with only digits recognized by Character#isDigit() remaining */
public static String digitsOnly(String s) {
StringBuilder sb = new StringBuilder();
for (int i = 0; i < s.length(); i++) {
char c = s.charAt(i);
if (Character.isDigit(c)) {
sb.append(c);
}
}
return sb.toString();
}
// Returns the T9 representation of a lower case character, otherwise returns the character.
static char getDigit(char c) {
switch (c) {
case 'a':
case 'b':
case 'c':
return '2';
case 'd':
case 'e':
case 'f':
return '3';
case 'g':
case 'h':
case 'i':
return '4';
case 'j':
case 'k':
case 'l':
return '5';
case 'm':
case 'n':
case 'o':
return '6';
case 'p':
case 'q':
case 'r':
case 's':
return '7';
case 't':
case 'u':
case 'v':
return '8';
case 'w':
case 'x':
case 'y':
case 'z':
return '9';
default:
return c;
}
}
}
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