https://commons.apache.org/proper/commons-collections/: The Apache Commons Collections package contains types that extend and augment the Java Collections Framework. (The Apache Software Foundation)
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public class org.apache.commons.collections4.collection.TransformedCollection<E> extends org.apache.commons.collections4.collection.AbstractCollectionDecorator<E>
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: org.apache.commons.collections4.collection.TransformedCollection
  super_class: org.apache.commons.collections4.collection.AbstractCollectionDecorator
{
  private static final long serialVersionUID;
    descriptor: J
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL
    ConstantValue: 8692300188161871514

  protected final org.apache.commons.collections4.Transformer<? super E, ? extends E> transformer;
    descriptor: Lorg/apache/commons/collections4/Transformer;
    flags: (0x0014) ACC_PROTECTED, ACC_FINAL
    Signature: Lorg/apache/commons/collections4/Transformer<-TE;+TE;>;

  public static <E> org.apache.commons.collections4.collection.TransformedCollection<E> transformingCollection(java.util.Collection<E>, org.apache.commons.collections4.Transformer<? super E, ? extends E>);
    descriptor: (Ljava/util/Collection;Lorg/apache/commons/collections4/Transformer;)Lorg/apache/commons/collections4/collection/TransformedCollection;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=4, locals=2, args_size=2
        start local 0 // java.util.Collection coll
        start local 1 // org.apache.commons.collections4.Transformer transformer
         0: .line 64
            new org.apache.commons.collections4.collection.TransformedCollection
            dup
            aload 0 /* coll */
            aload 1 /* transformer */
            invokespecial org.apache.commons.collections4.collection.TransformedCollection.<init>:(Ljava/util/Collection;Lorg/apache/commons/collections4/Transformer;)V
            areturn
        end local 1 // org.apache.commons.collections4.Transformer transformer
        end local 0 // java.util.Collection coll
      LocalVariableTable:
        Start  End  Slot         Name  Signature
            0    1     0         coll  Ljava/util/Collection<TE;>;
            0    1     1  transformer  Lorg/apache/commons/collections4/Transformer<-TE;+TE;>;
    Signature: <E:Ljava/lang/Object;>(Ljava/util/Collection<TE;>;Lorg/apache/commons/collections4/Transformer<-TE;+TE;>;)Lorg/apache/commons/collections4/collection/TransformedCollection<TE;>;
    MethodParameters:
             Name  Flags
      coll         final
      transformer  final

  public static <E> org.apache.commons.collections4.collection.TransformedCollection<E> transformedCollection(java.util.Collection<E>, org.apache.commons.collections4.Transformer<? super E, ? extends E>);
    descriptor: (Ljava/util/Collection;Lorg/apache/commons/collections4/Transformer;)Lorg/apache/commons/collections4/collection/TransformedCollection;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=4, locals=8, args_size=2
        start local 0 // java.util.Collection collection
        start local 1 // org.apache.commons.collections4.Transformer transformer
         0: .line 85
            new org.apache.commons.collections4.collection.TransformedCollection
            dup
            aload 0 /* collection */
            aload 1 /* transformer */
            invokespecial org.apache.commons.collections4.collection.TransformedCollection.<init>:(Ljava/util/Collection;Lorg/apache/commons/collections4/Transformer;)V
            astore 2 /* decorated */
        start local 2 // org.apache.commons.collections4.collection.TransformedCollection decorated
         1: .line 87
            aload 0 /* collection */
            invokeinterface java.util.Collection.size:()I
            ifle 9
         2: .line 89
            aload 0 /* collection */
            invokeinterface java.util.Collection.toArray:()[Ljava/lang/Object;
            astore 3 /* values */
        start local 3 // java.lang.Object[] values
         3: .line 90
            aload 0 /* collection */
            invokeinterface java.util.Collection.clear:()V
         4: .line 91
            aload 3 /* values */
            dup
            astore 7
            arraylength
            istore 6
            iconst_0
            istore 5
            goto 8
      StackMap locals: java.util.Collection org.apache.commons.collections4.Transformer org.apache.commons.collections4.collection.TransformedCollection java.lang.Object[] top int int java.lang.Object[]
      StackMap stack:
         5: aload 7
            iload 5
            aaload
            astore 4 /* value */
        start local 4 // java.lang.Object value
         6: .line 92
            aload 2 /* decorated */
            invokevirtual org.apache.commons.collections4.collection.TransformedCollection.decorated:()Ljava/util/Collection;
            aload 1 /* transformer */
            aload 4 /* value */
            invokeinterface org.apache.commons.collections4.Transformer.transform:(Ljava/lang/Object;)Ljava/lang/Object;
            invokeinterface java.util.Collection.add:(Ljava/lang/Object;)Z
            pop
        end local 4 // java.lang.Object value
         7: .line 91
            iinc 5 1
      StackMap locals:
      StackMap stack:
         8: iload 5
            iload 6
            if_icmplt 5
        end local 3 // java.lang.Object[] values
         9: .line 95
      StackMap locals: java.util.Collection org.apache.commons.collections4.Transformer org.apache.commons.collections4.collection.TransformedCollection
      StackMap stack:
            aload 2 /* decorated */
            areturn
        end local 2 // org.apache.commons.collections4.collection.TransformedCollection decorated
        end local 1 // org.apache.commons.collections4.Transformer transformer
        end local 0 // java.util.Collection collection
      LocalVariableTable:
        Start  End  Slot         Name  Signature
            0   10     0   collection  Ljava/util/Collection<TE;>;
            0   10     1  transformer  Lorg/apache/commons/collections4/Transformer<-TE;+TE;>;
            1   10     2    decorated  Lorg/apache/commons/collections4/collection/TransformedCollection<TE;>;
            3    9     3       values  [Ljava/lang/Object;
            6    7     4        value  TE;
    Signature: <E:Ljava/lang/Object;>(Ljava/util/Collection<TE;>;Lorg/apache/commons/collections4/Transformer<-TE;+TE;>;)Lorg/apache/commons/collections4/collection/TransformedCollection<TE;>;
    MethodParameters:
             Name  Flags
      collection   final
      transformer  final

  protected void <init>(java.util.Collection<E>, org.apache.commons.collections4.Transformer<? super E, ? extends E>);
    descriptor: (Ljava/util/Collection;Lorg/apache/commons/collections4/Transformer;)V
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=3, locals=3, args_size=3
        start local 0 // org.apache.commons.collections4.collection.TransformedCollection this
        start local 1 // java.util.Collection coll
        start local 2 // org.apache.commons.collections4.Transformer transformer
         0: .line 110
            aload 0 /* this */
            aload 1 /* coll */
            invokespecial org.apache.commons.collections4.collection.AbstractCollectionDecorator.<init>:(Ljava/util/Collection;)V
         1: .line 111
            aload 2 /* transformer */
            ifnonnull 3
         2: .line 112
            new java.lang.NullPointerException
            dup
            ldc "Transformer must not be null"
            invokespecial java.lang.NullPointerException.<init>:(Ljava/lang/String;)V
            athrow
         3: .line 114
      StackMap locals: org.apache.commons.collections4.collection.TransformedCollection java.util.Collection org.apache.commons.collections4.Transformer
      StackMap stack:
            aload 0 /* this */
            aload 2 /* transformer */
            putfield org.apache.commons.collections4.collection.TransformedCollection.transformer:Lorg/apache/commons/collections4/Transformer;
         4: .line 115
            return
        end local 2 // org.apache.commons.collections4.Transformer transformer
        end local 1 // java.util.Collection coll
        end local 0 // org.apache.commons.collections4.collection.TransformedCollection this
      LocalVariableTable:
        Start  End  Slot         Name  Signature
            0    5     0         this  Lorg/apache/commons/collections4/collection/TransformedCollection<TE;>;
            0    5     1         coll  Ljava/util/Collection<TE;>;
            0    5     2  transformer  Lorg/apache/commons/collections4/Transformer<-TE;+TE;>;
    Signature: (Ljava/util/Collection<TE;>;Lorg/apache/commons/collections4/Transformer<-TE;+TE;>;)V
    MethodParameters:
             Name  Flags
      coll         final
      transformer  final

  protected E transform();
    descriptor: (Ljava/lang/Object;)Ljava/lang/Object;
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.apache.commons.collections4.collection.TransformedCollection this
        start local 1 // java.lang.Object object
         0: .line 126
            aload 0 /* this */
            getfield org.apache.commons.collections4.collection.TransformedCollection.transformer:Lorg/apache/commons/collections4/Transformer;
            aload 1 /* object */
            invokeinterface org.apache.commons.collections4.Transformer.transform:(Ljava/lang/Object;)Ljava/lang/Object;
            areturn
        end local 1 // java.lang.Object object
        end local 0 // org.apache.commons.collections4.collection.TransformedCollection this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    1     0    this  Lorg/apache/commons/collections4/collection/TransformedCollection<TE;>;
            0    1     1  object  TE;
    Signature: (TE;)TE;
    MethodParameters:
        Name  Flags
      object  final

  protected java.util.Collection<E> transform(java.util.Collection<? extends E>);
    descriptor: (Ljava/util/Collection;)Ljava/util/Collection;
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=3, locals=5, args_size=2
        start local 0 // org.apache.commons.collections4.collection.TransformedCollection this
        start local 1 // java.util.Collection coll
         0: .line 138
            new java.util.ArrayList
            dup
            aload 1 /* coll */
            invokeinterface java.util.Collection.size:()I
            invokespecial java.util.ArrayList.<init>:(I)V
            astore 2 /* list */
        start local 2 // java.util.List list
         1: .line 139
            aload 1 /* coll */
            invokeinterface java.util.Collection.iterator:()Ljava/util/Iterator;
            astore 4
            goto 4
      StackMap locals: org.apache.commons.collections4.collection.TransformedCollection java.util.Collection java.util.List top java.util.Iterator
      StackMap stack:
         2: aload 4
            invokeinterface java.util.Iterator.next:()Ljava/lang/Object;
            checkcast java.lang.Object
            astore 3 /* item */
        start local 3 // java.lang.Object item
         3: .line 140
            aload 2 /* list */
            aload 0 /* this */
            aload 3 /* item */
            invokevirtual org.apache.commons.collections4.collection.TransformedCollection.transform:(Ljava/lang/Object;)Ljava/lang/Object;
            invokeinterface java.util.List.add:(Ljava/lang/Object;)Z
            pop
        end local 3 // java.lang.Object item
         4: .line 139
      StackMap locals:
      StackMap stack:
            aload 4
            invokeinterface java.util.Iterator.hasNext:()Z
            ifne 2
         5: .line 142
            aload 2 /* list */
            areturn
        end local 2 // java.util.List list
        end local 1 // java.util.Collection coll
        end local 0 // org.apache.commons.collections4.collection.TransformedCollection this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    6     0  this  Lorg/apache/commons/collections4/collection/TransformedCollection<TE;>;
            0    6     1  coll  Ljava/util/Collection<+TE;>;
            1    6     2  list  Ljava/util/List<TE;>;
            3    4     3  item  TE;
    Signature: (Ljava/util/Collection<+TE;>;)Ljava/util/Collection<TE;>;
    MethodParameters:
      Name  Flags
      coll  final

  public boolean add();
    descriptor: (Ljava/lang/Object;)Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=2, args_size=2
        start local 0 // org.apache.commons.collections4.collection.TransformedCollection this
        start local 1 // java.lang.Object object
         0: .line 148
            aload 0 /* this */
            invokevirtual org.apache.commons.collections4.collection.TransformedCollection.decorated:()Ljava/util/Collection;
            aload 0 /* this */
            aload 1 /* object */
            invokevirtual org.apache.commons.collections4.collection.TransformedCollection.transform:(Ljava/lang/Object;)Ljava/lang/Object;
            invokeinterface java.util.Collection.add:(Ljava/lang/Object;)Z
            ireturn
        end local 1 // java.lang.Object object
        end local 0 // org.apache.commons.collections4.collection.TransformedCollection this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    1     0    this  Lorg/apache/commons/collections4/collection/TransformedCollection<TE;>;
            0    1     1  object  TE;
    Signature: (TE;)Z
    MethodParameters:
        Name  Flags
      object  final

  public boolean addAll(java.util.Collection<? extends E>);
    descriptor: (Ljava/util/Collection;)Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=2, args_size=2
        start local 0 // org.apache.commons.collections4.collection.TransformedCollection this
        start local 1 // java.util.Collection coll
         0: .line 153
            aload 0 /* this */
            invokevirtual org.apache.commons.collections4.collection.TransformedCollection.decorated:()Ljava/util/Collection;
            aload 0 /* this */
            aload 1 /* coll */
            invokevirtual org.apache.commons.collections4.collection.TransformedCollection.transform:(Ljava/util/Collection;)Ljava/util/Collection;
            invokeinterface java.util.Collection.addAll:(Ljava/util/Collection;)Z
            ireturn
        end local 1 // java.util.Collection coll
        end local 0 // org.apache.commons.collections4.collection.TransformedCollection this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/apache/commons/collections4/collection/TransformedCollection<TE;>;
            0    1     1  coll  Ljava/util/Collection<+TE;>;
    Signature: (Ljava/util/Collection<+TE;>;)Z
    MethodParameters:
      Name  Flags
      coll  final
}
Signature: <E:Ljava/lang/Object;>Lorg/apache/commons/collections4/collection/AbstractCollectionDecorator<TE;>;
SourceFile: "TransformedCollection.java"