/*
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* Copyright (C) 2016 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.launcher3.util;
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import java.text.Collator;
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import java.util.Comparator;
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/**
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* Extension of {@link java.text.Collator} with special handling for digits. Used for comparing
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* user visible labels.
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*/
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public class LabelComparator implements Comparator<String> {
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private final Collator mCollator = Collator.getInstance();
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@Override
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public int compare(String titleA, String titleB) {
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// Ensure that we de-prioritize any titles that don't start with a
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// linguistic letter or digit
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boolean aStartsWithLetter = (titleA.length() > 0) &&
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Character.isLetterOrDigit(titleA.codePointAt(0));
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boolean bStartsWithLetter = (titleB.length() > 0) &&
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Character.isLetterOrDigit(titleB.codePointAt(0));
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if (aStartsWithLetter && !bStartsWithLetter) {
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return -1;
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} else if (!aStartsWithLetter && bStartsWithLetter) {
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return 1;
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}
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// Order by the title in the current locale
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return mCollator.compare(titleA, titleB);
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}
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}
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