66 lines
2.1 KiB
Java
66 lines
2.1 KiB
Java
/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.dialer.enrichedcall;
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import android.support.annotation.NonNull;
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/** Utility for comparing phone numbers. */
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public class FuzzyPhoneNumberMatcher {
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private static final int REQUIRED_MATCHED_DIGITS = 7;
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/**
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* Returns {@code true} if the given numbers can be interpreted to be the same.
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*
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* <p>This method is called numerous times when rendering the call log. Using string methods is
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* too slow, so character by character matching is used instead.
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*/
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public static boolean matches(@NonNull String lhs, @NonNull String rhs) {
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return lastSevenDigitsCharacterByCharacterMatches(lhs, rhs);
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}
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/**
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* This strategy examines the numbers character by character starting from the end. If the last
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* {@link #REQUIRED_MATCHED_DIGITS} match, it returns {@code true}.
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*/
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private static boolean lastSevenDigitsCharacterByCharacterMatches(
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@NonNull String lhs, @NonNull String rhs) {
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int lhsIndex = lhs.length() - 1;
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int rhsIndex = rhs.length() - 1;
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int matchedDigits = 0;
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while (lhsIndex >= 0 && rhsIndex >= 0) {
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if (!Character.isDigit(lhs.charAt(lhsIndex))) {
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--lhsIndex;
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continue;
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}
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if (!Character.isDigit(rhs.charAt(rhsIndex))) {
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--rhsIndex;
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continue;
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}
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if (lhs.charAt(lhsIndex) != rhs.charAt(rhsIndex)) {
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break;
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}
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--lhsIndex;
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--rhsIndex;
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++matchedDigits;
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}
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return matchedDigits >= REQUIRED_MATCHED_DIGITS;
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}
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}
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