package com.ruoyi.system.service.impl;
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import java.util.ArrayList;
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import java.util.Collection;
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import java.util.Comparator;
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import java.util.LinkedHashSet;
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import java.util.List;
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import java.util.Set;
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/** 按单个接收区间检查历史序号；暂停和区间边界由调用方分组后自然排除。 */
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final class IntervalIntegrityChecker
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{
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record Gap(long from, long to) { }
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private IntervalIntegrityChecker() { }
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static List<Gap> gaps(Collection<Long> sequenceIds)
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{
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if (sequenceIds == null || sequenceIds.isEmpty()) return List.of();
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Set<Long> unique = new LinkedHashSet<>();
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sequenceIds.stream().filter(value -> value != null && value > 0).forEach(unique::add);
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List<Long> ordered = new ArrayList<>(unique);
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ordered.sort(Comparator.naturalOrder());
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List<Gap> result = new ArrayList<>();
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for (int index = 1; index < ordered.size(); index++)
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{
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long previous = ordered.get(index - 1);
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long current = ordered.get(index);
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if (current > previous + 1) result.add(new Gap(previous + 1, current - 1));
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}
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return List.copyOf(result);
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}
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}
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