https://github.com/eclipse/eclipse-collections/eclipse-collections: Eclipse Collections is a collections framework for Java. It has JDK-compatible List, Set and Map implementations with a rich API and set of utility classes that work with any JDK compatible Collections, Arrays, Maps or Strings. The iteration protocol was inspired by the Smalltalk collection framework.
  • Craig P. Motlin
  • Donald Raab
  • Mohammad A. Rezaei
  • Hiroshi Ito
  • Nikhil J. Nanivadekar 
public abstract class org.eclipse.collections.impl.parallel.AbstractTransformerBasedCombiner<V, T, BT extends org.eclipse.collections.api.block.procedure.Procedure<T>> extends org.eclipse.collections.impl.parallel.AbstractProcedureCombiner<BT>
  minor version: 0
  major version: 59
  flags: flags: (0x0421) ACC_PUBLIC, ACC_SUPER, ACC_ABSTRACT
  this_class: org.eclipse.collections.impl.parallel.AbstractTransformerBasedCombiner
  super_class: org.eclipse.collections.impl.parallel.AbstractProcedureCombiner
{
  private static final long serialVersionUID;
    descriptor: J
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL
    ConstantValue: 1

  protected final java.util.Collection<V> result;
    descriptor: Ljava/util/Collection;
    flags: (0x0014) ACC_PROTECTED, ACC_FINAL
    Signature: Ljava/util/Collection<TV;>;

  protected void <init>(boolean, java.util.Collection<V>, java.lang.Iterable<T>, );
    descriptor: (ZLjava/util/Collection;Ljava/lang/Iterable;I)V
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=5, locals=5, args_size=5
        start local 0 // org.eclipse.collections.impl.parallel.AbstractTransformerBasedCombiner this
        start local 1 // boolean useCombineOne
        start local 2 // java.util.Collection targetCollection
        start local 3 // java.lang.Iterable iterable
        start local 4 // int initialCapacity
         0: .line 36
            aload 0 /* this */
            iload 1 /* useCombineOne */
            invokespecial org.eclipse.collections.impl.parallel.AbstractProcedureCombiner.<init>:(Z)V
         1: .line 37
            aload 0 /* this */
            aload 0 /* this */
            aload 3 /* iterable */
            aload 2 /* targetCollection */
            iload 4 /* initialCapacity */
            invokevirtual org.eclipse.collections.impl.parallel.AbstractTransformerBasedCombiner.initializeResult:(Ljava/lang/Iterable;Ljava/util/Collection;I)Ljava/util/Collection;
            putfield org.eclipse.collections.impl.parallel.AbstractTransformerBasedCombiner.result:Ljava/util/Collection;
         2: .line 38
            return
        end local 4 // int initialCapacity
        end local 3 // java.lang.Iterable iterable
        end local 2 // java.util.Collection targetCollection
        end local 1 // boolean useCombineOne
        end local 0 // org.eclipse.collections.impl.parallel.AbstractTransformerBasedCombiner this
      LocalVariableTable:
        Start  End  Slot              Name  Signature
            0    3     0              this  Lorg/eclipse/collections/impl/parallel/AbstractTransformerBasedCombiner<TV;TT;TBT;>;
            0    3     1     useCombineOne  Z
            0    3     2  targetCollection  Ljava/util/Collection<TV;>;
            0    3     3          iterable  Ljava/lang/Iterable<TT;>;
            0    3     4   initialCapacity  I
    Signature: (ZLjava/util/Collection<TV;>;Ljava/lang/Iterable<TT;>;I)V
    MethodParameters:
                  Name  Flags
      useCombineOne     
      targetCollection  
      iterable          
      initialCapacity   

  protected java.util.Collection<V> initializeResult(java.lang.Iterable<T>, java.util.Collection<V>, int);
    descriptor: (Ljava/lang/Iterable;Ljava/util/Collection;I)Ljava/util/Collection;
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=3, locals=4, args_size=4
        start local 0 // org.eclipse.collections.impl.parallel.AbstractTransformerBasedCombiner this
        start local 1 // java.lang.Iterable sourceIterable
        start local 2 // java.util.Collection targetCollection
        start local 3 // int initialCapacity
         0: .line 42
            aload 2 /* targetCollection */
            ifnull 2
         1: .line 44
            aload 2 /* targetCollection */
            areturn
         2: .line 46
      StackMap locals:
      StackMap stack:
            aload 1 /* sourceIterable */
            instanceof org.eclipse.collections.api.list.ListIterable
            ifeq 4
         3: .line 48
            new org.eclipse.collections.impl.list.mutable.CompositeFastList
            dup
            invokespecial org.eclipse.collections.impl.list.mutable.CompositeFastList.<init>:()V
            areturn
         4: .line 50
      StackMap locals:
      StackMap stack:
            aload 1 /* sourceIterable */
            instanceof org.eclipse.collections.api.set.sorted.SortedSetIterable
            ifeq 6
         5: .line 52
            invokestatic org.eclipse.collections.impl.list.mutable.FastList.newList:()Lorg/eclipse/collections/impl/list/mutable/FastList;
            areturn
         6: .line 54
      StackMap locals:
      StackMap stack:
            aload 1 /* sourceIterable */
            instanceof org.eclipse.collections.api.set.SetIterable
            ifeq 9
         7: .line 56
            aload 0 /* this */
            iconst_1
            invokevirtual org.eclipse.collections.impl.parallel.AbstractTransformerBasedCombiner.setCombineOne:(Z)V
         8: .line 57
            iload 3 /* initialCapacity */
            invokestatic org.eclipse.collections.impl.set.mutable.UnifiedSet.newSet:(I)Lorg/eclipse/collections/impl/set/mutable/UnifiedSet;
            areturn
         9: .line 59
      StackMap locals:
      StackMap stack:
            aload 1 /* sourceIterable */
            instanceof org.eclipse.collections.api.bag.Bag
            ifne 10
            aload 1 /* sourceIterable */
            instanceof org.eclipse.collections.api.map.MapIterable
            ifeq 11
        10: .line 61
      StackMap locals:
      StackMap stack:
            iload 3 /* initialCapacity */
            invokestatic org.eclipse.collections.impl.bag.mutable.HashBag.newBag:(I)Lorg/eclipse/collections/impl/bag/mutable/HashBag;
            areturn
        11: .line 63
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            aload 1 /* sourceIterable */
            iload 3 /* initialCapacity */
            invokevirtual org.eclipse.collections.impl.parallel.AbstractTransformerBasedCombiner.createResultForCollection:(Ljava/lang/Iterable;I)Ljava/util/Collection;
            areturn
        end local 3 // int initialCapacity
        end local 2 // java.util.Collection targetCollection
        end local 1 // java.lang.Iterable sourceIterable
        end local 0 // org.eclipse.collections.impl.parallel.AbstractTransformerBasedCombiner this
      LocalVariableTable:
        Start  End  Slot              Name  Signature
            0   12     0              this  Lorg/eclipse/collections/impl/parallel/AbstractTransformerBasedCombiner<TV;TT;TBT;>;
            0   12     1    sourceIterable  Ljava/lang/Iterable<TT;>;
            0   12     2  targetCollection  Ljava/util/Collection<TV;>;
            0   12     3   initialCapacity  I
    Signature: (Ljava/lang/Iterable<TT;>;Ljava/util/Collection<TV;>;I)Ljava/util/Collection<TV;>;
    MethodParameters:
                  Name  Flags
      sourceIterable    
      targetCollection  
      initialCapacity   

  private java.util.Collection<V> createResultForCollection(java.lang.Iterable<T>, int);
    descriptor: (Ljava/lang/Iterable;I)Ljava/util/Collection;
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=3, locals=3, args_size=3
        start local 0 // org.eclipse.collections.impl.parallel.AbstractTransformerBasedCombiner this
        start local 1 // java.lang.Iterable sourceCollection
        start local 2 // int initialCapacity
         0: .line 68
            aload 1 /* sourceCollection */
            instanceof java.util.Collection
            ifeq 2
         1: .line 70
            getstatic org.eclipse.collections.impl.utility.internal.DefaultSpeciesNewStrategy.INSTANCE:Lorg/eclipse/collections/impl/utility/internal/DefaultSpeciesNewStrategy;
            aload 1 /* sourceCollection */
            checkcast java.util.Collection
            iload 2 /* initialCapacity */
            invokevirtual org.eclipse.collections.impl.utility.internal.DefaultSpeciesNewStrategy.speciesNew:(Ljava/util/Collection;I)Ljava/util/Collection;
            areturn
         2: .line 72
      StackMap locals:
      StackMap stack:
            iload 2 /* initialCapacity */
            invokestatic org.eclipse.collections.impl.list.mutable.FastList.newList:(I)Lorg/eclipse/collections/impl/list/mutable/FastList;
            areturn
        end local 2 // int initialCapacity
        end local 1 // java.lang.Iterable sourceCollection
        end local 0 // org.eclipse.collections.impl.parallel.AbstractTransformerBasedCombiner this
      LocalVariableTable:
        Start  End  Slot              Name  Signature
            0    3     0              this  Lorg/eclipse/collections/impl/parallel/AbstractTransformerBasedCombiner<TV;TT;TBT;>;
            0    3     1  sourceCollection  Ljava/lang/Iterable<TT;>;
            0    3     2   initialCapacity  I
    Signature: (Ljava/lang/Iterable<TT;>;I)Ljava/util/Collection<TV;>;
    MethodParameters:
                  Name  Flags
      sourceCollection  
      initialCapacity   

  public java.util.Collection<V> getResult();
    descriptor: ()Ljava/util/Collection;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.eclipse.collections.impl.parallel.AbstractTransformerBasedCombiner this
         0: .line 77
            aload 0 /* this */
            getfield org.eclipse.collections.impl.parallel.AbstractTransformerBasedCombiner.result:Ljava/util/Collection;
            areturn
        end local 0 // org.eclipse.collections.impl.parallel.AbstractTransformerBasedCombiner this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/eclipse/collections/impl/parallel/AbstractTransformerBasedCombiner<TV;TT;TBT;>;
    Signature: ()Ljava/util/Collection<TV;>;
}
Signature: <V:Ljava/lang/Object;T:Ljava/lang/Object;BT::Lorg/eclipse/collections/api/block/procedure/Procedure<TT;>;>Lorg/eclipse/collections/impl/parallel/AbstractProcedureCombiner<TBT;>;
SourceFile: "AbstractTransformerBasedCombiner.java"