refactor: add CelestialCollector utility class

Author: ROMVoid95

src/main/java/micdoodle8/mods/galacticraft/api/util/stream/Accumulator.java

@@ -12,22 +12,15 @@
 
 import micdoodle8.mods.galacticraft.api.galaxies.CelestialObject;
 import micdoodle8.mods.galacticraft.core.util.list.CelestialList;
-import micdoodle8.mods.galacticraft.core.util.list.ImmutableCelestialList;
 
 import lombok.experimental.UtilityClass;
 
-import static java.util.stream.Collector.Characteristics.CONCURRENT;
 import static java.util.stream.Collector.Characteristics.IDENTITY_FINISH;
-import static java.util.stream.Collector.Characteristics.UNORDERED;
 
 @UtilityClass
-public final class Accumulators
+public final class CelestialCollector
 {
-    static final Set<Accumulator.Characteristics> CH_CONCURRENT_ID   = from(CONCURRENT, UNORDERED, IDENTITY_FINISH);
-    static final Set<Accumulator.Characteristics> CH_CONCURRENT_NOID = from(CONCURRENT, UNORDERED);
-    static final Set<Accumulator.Characteristics> CH_ID              = from(IDENTITY_FINISH);
-    static final Set<Accumulator.Characteristics> CH_UNORDERED_ID    = from(UNORDERED, IDENTITY_FINISH);
-    static final Set<Accumulator.Characteristics> CH_NOID            = Collections.emptySet();
+    static final Set<Collector.Characteristics> CH_ID = from(IDENTITY_FINISH);
 
     static final Set<Collector.Characteristics> from(Collector.Characteristics... arr)
     {
@@ -41,7 +34,7 @@ private static <I, R> Function<I, R> castingIdentity()
     }
 
     //@noformat
-    static class AccumulatorImpl<T, A, R> implements Accumulator<T, A, R> {
+    static class AccumulatorImpl<T, A, R> implements Collector<T, A, R> {
         private final Supplier<A> supplier;
         private final BiConsumer<A, T> accumulator;
         private final BinaryOperator<A> combiner;
@@ -94,12 +87,7 @@ public Set<Characteristics> characteristics() {
     }
 
     public static <T extends CelestialObject>
-    Accumulator<T, ?, CelestialList<T>> celestialList() {
+    Collector<T, ?, CelestialList<T>> toList() {
         return new AccumulatorImpl<>((Supplier<CelestialList<T>>) CelestialList::new, CelestialList::add, (left, right) -> { left.addAll(right); return left; }, CH_ID);
     }
-    
-    public static <T extends CelestialObject>
-    Accumulator<T, ?, ImmutableCelestialList<T>> toImmutableCelestialList() {
-        return new AccumulatorImpl<>((Supplier<ImmutableCelestialList<T>>) ImmutableCelestialList::new, ImmutableCelestialList::add, (left, right) -> { left.addAll(right); return left; }, CH_ID);
-    }
 }

src/main/java/micdoodle8/mods/galacticraft/api/util/stream/Accumulators.java renamed to src/main/java/micdoodle8/mods/galacticraft/api/util/stream/CelestialCollector.java

@@ -75,4 +75,9 @@ public Map<String, T> getRegistered()
     {
         return ImmutableMap.copyOf(this.celestialListMap);
     }
+    
+    public ImmutableCelestialList<T> toUnmodifiableList()
+    {
+        return ImmutableCelestialList.unmodifiable(this);
+    }
 }