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Replace Maps.newConcurrentMap, Sets.newTreeSet and Strings.nullToEmpty in NoGuava - #1421
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…y in NoGuava Each has an exact Java standard library equivalent, but NoGuava left them in place.
A file that keeps using Guava's `Objects` gets `java.util.Objects.toString(s, "")` in full, as the PR describes, and a test now covers it. The comment on the missing `newTreeSet(Iterable)` template states the invariant.
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NoGuavaleaves four Guava calls in place although each has an exact JDK equivalent. Across about 22,500 public Java repositories, 159 callMaps.newConcurrentMap(), 157 callStrings.nullToEmpty(..)and 81 callSets.newTreeSet(..), so a project that uses any of them keeps its Guava dependency after the migration.This adds Refaster templates to
NoGuavaRefaster, whichNoGuavaalready runs asNoGuavaRefasterRecipes:Maps.newConcurrentMap()new ConcurrentHashMap<>()Sets.newTreeSet()new TreeSet<>()Sets.newTreeSet(comparator)new TreeSet<>(comparator)Strings.nullToEmpty(s)Objects.toString(s, "")Maps.newConcurrentMap()returns aConcurrentHashMaptyped asConcurrentMap, so the replacement fits wherever the original did.Objects.toString(s, "")returnss.toString()for a non-nullString, which issitself.Objects.toString(s, "")is preferred toObjects.requireNonNullElse(s, "")because it exists since Java 7 and needs no version gate. It is not statically imported, since a class's owntoString()would shadow it. In a file that imports Guava'sObjects, the template writesjava.util.Objects.toString(..)in full.Sets.newTreeSet(Iterable)has no template. Given an argument typed as aSortedSet,new TreeSet<>(..)keeps that set's comparator, where Guava sorts by natural order.NoGuavaRefasterTesthas a test for each replacement, and each failed before the templates existed.