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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.enrichedcall;
import android.support.annotation.NonNull;
/** Utility for comparing phone numbers. */
public class FuzzyPhoneNumberMatcher {
private static final int REQUIRED_MATCHED_DIGITS = 7;
/**
* Returns {@code true} if the given numbers can be interpreted to be the same.
*
* <p>This method is called numerous times when rendering the call log. Using string methods is
* too slow, so character by character matching is used instead.
*/
public static boolean matches(@NonNull String lhs, @NonNull String rhs) {
return lastSevenDigitsCharacterByCharacterMatches(lhs, rhs);
}
/**
* This strategy examines the numbers character by character starting from the end. If the last
* {@link #REQUIRED_MATCHED_DIGITS} match, it returns {@code true}.
*/
private static boolean lastSevenDigitsCharacterByCharacterMatches(
@NonNull String lhs, @NonNull String rhs) {
int lhsIndex = lhs.length() - 1;
int rhsIndex = rhs.length() - 1;
int matchedDigits = 0;
while (lhsIndex >= 0 && rhsIndex >= 0) {
if (!Character.isDigit(lhs.charAt(lhsIndex))) {
--lhsIndex;
continue;
}
if (!Character.isDigit(rhs.charAt(rhsIndex))) {
--rhsIndex;
continue;
}
if (lhs.charAt(lhsIndex) != rhs.charAt(rhsIndex)) {
break;
}
--lhsIndex;
--rhsIndex;
++matchedDigits;
}
return matchedDigits >= REQUIRED_MATCHED_DIGITS;
}
}
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