Create a base class for DASH downloading related tests
------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=158129802
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@ -110,7 +110,8 @@ public final class SimpleCache implements Cache {
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@Override
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public synchronized NavigableSet<CacheSpan> getCachedSpans(String key) {
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CachedContent cachedContent = index.get(key);
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return cachedContent == null ? null : new TreeSet<CacheSpan>(cachedContent.getSpans());
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return cachedContent == null || cachedContent.isEmpty() ? null
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: new TreeSet<CacheSpan>(cachedContent.getSpans());
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}
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@Override
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