# Uses of Interface
org.apache.commons.collections4.Transformer

Packages that use Transformer
Package
Description
org.apache.commons.collections4
Interfaces and utilities shared across all packages.
org.apache.commons.collections4.bag
Implements the `Bag` and `SortedBag` interfaces.
org.apache.commons.collections4.collection
Implementations of the `Collection` interface.
org.apache.commons.collections4.comparators
Implements the `Comparator` interface.
org.apache.commons.collections4.functors
Implements the `Closure`, `Predicate`, `Transformer` and `Factory` interfaces.
org.apache.commons.collections4.iterators
Implements the `Iterator` interface.
org.apache.commons.collections4.list
Implements the `List` interface.
org.apache.commons.collections4.map
Implements the `Map`, `IterableMap`, `OrderedMap` and `SortedMap` interfaces.
org.apache.commons.collections4.multimap
Implements the `MultiValuedMap` interfaces.
org.apache.commons.collections4.multiset
Implements the `MultiSet` interface.
org.apache.commons.collections4.queue
Implements the `Queue` interface.
org.apache.commons.collections4.set
Implements the `Set`, `SortedSet` and `NavigableSet` interfaces.
org.apache.commons.collections4.splitmap
Implements the "split map" concept.

- ## Uses of Transformer in org.apache.commons.collections4

  Methods in org.apache.commons.collections4 that return Transformer
  Modifier and Type
  Method
  Description
  `static <T> Transformer<T,T>`
  TransformerUtils.`asTransformer(Closure<? super T> closure)`
  Creates a Transformer that calls a Closure each time the transformer is used.
  `static <I, O> Transformer<I,O>`
  TransformerUtils.`asTransformer(Factory<? extends O> factory)`
  Creates a Transformer that calls a Factory each time the transformer is used.
  `static <T> Transformer<T,Boolean>`
  TransformerUtils.`asTransformer(Predicate<? super T> predicate)`
  Creates a Transformer that calls a Predicate each time the transformer is used.
  `static <T> Transformer<T,T>`
  TransformerUtils.`chainedTransformer(Collection<? extends Transformer<? super T,? extends T>> transformers)`
  Create a new Transformer that calls each transformer in turn, passing the result into the next transformer.
  `static <T> Transformer<T,T>`
  TransformerUtils.`chainedTransformer(Transformer<? super T,? extends T>... transformers)`
  Create a new Transformer that calls each transformer in turn, passing the result into the next transformer.
  `static <T> Transformer<T,T>`
  TransformerUtils.`cloneTransformer()`
  Gets a transformer that returns a clone of the input object.
  `static <I, O> Transformer<I,O>`
  TransformerUtils.`constantTransformer(O constantToReturn)`
  Creates a Transformer that will return the same object each time the transformer is used.
  `static <I, O> Transformer<I,O>`
  TransformerUtils.`exceptionTransformer()`
  Gets a transformer that always throws an exception.
  `static <I, O> Transformer<I,O>`
  TransformerUtils.`ifTransformer(Predicate<? super I> predicate, Transformer<? super I,? extends O> trueTransformer, Transformer<? super I,? extends O> falseTransformer)`
  Create a new Transformer that calls one of two transformers depending on the specified predicate.
  `static <T> Transformer<T,T>`
  TransformerUtils.`ifTransformer(Predicate<? super T> predicate, Transformer<? super T,? extends T> trueTransformer)`
  Create a new Transformer that calls the transformer if the predicate is true, otherwise the input object is returned unchanged.
  `static <T> Transformer<Class<? extends T>,T>`
  TransformerUtils.`instantiateTransformer()`
  Gets a Transformer that expects an input Class object that it will instantiate.
  `static <T> Transformer<Class<? extends T>,T>`
  TransformerUtils.`instantiateTransformer(Class<?>[] paramTypes, Object[] args)`
  Creates a Transformer that expects an input Class object that it will instantiate.
  `static <I, O> Transformer<I,O>`
  TransformerUtils.`invokerTransformer(String methodName)`
  Gets a Transformer that invokes a method on the input object.
  `static <I, O> Transformer<I,O>`
  TransformerUtils.`invokerTransformer(String methodName, Class<?>[] paramTypes, Object[] args)`
  Gets a Transformer that invokes a method on the input object.
  `static <I, O> Transformer<I,O>`
  TransformerUtils.`mapTransformer(Map<? super I,? extends O> map)`
  Creates a Transformer that uses the passed in Map to transform the input object (as a simple lookup).
  `static <T> Transformer<T,T>`
  TransformerUtils.`nopTransformer()`
  Gets a transformer that returns the input object.
  `static <I, O> Transformer<I,O>`
  TransformerUtils.`nullTransformer()`
  Gets a transformer that always returns null.
  `static <T> Transformer<T,String>`
  TransformerUtils.`stringValueTransformer()`
  Gets a transformer that returns a `String` representation of the input object.
  `static <I, O> Transformer<I,O>`
  TransformerUtils.`switchMapTransformer(Map<I,Transformer<I,O>> objectsAndTransformers)`
  Create a new Transformer that uses the input object as a key to find the transformer to call.
  `static <I, O> Transformer<I,O>`
  TransformerUtils.`switchTransformer(Map<Predicate<I>,Transformer<I,O>> predicatesAndTransformers)`
  Create a new Transformer that calls one of the transformers depending on the predicates.
  `static <I, O> Transformer<I,O>`
  TransformerUtils.`switchTransformer(Predicate<? super I>[] predicates, Transformer<? super I,? extends O>[] transformers)`
  Create a new Transformer that calls one of the transformers depending on the predicates.
  `static <I, O> Transformer<I,O>`
  TransformerUtils.`switchTransformer(Predicate<? super I>[] predicates, Transformer<? super I,? extends O>[] transformers, Transformer<? super I,? extends O> defaultTransformer)`
  Create a new Transformer that calls one of the transformers depending on the predicates.
  `static <I, O> Transformer<I,O>`
  TransformerUtils.`switchTransformer(Predicate<? super I> predicate, Transformer<? super I,? extends O> trueTransformer, Transformer<? super I,? extends O> falseTransformer)`
  Deprecated.
  as of 4.1, use `TransformerUtils.ifTransformer(Predicate, Transformer, Transformer)`
  Methods in org.apache.commons.collections4 with parameters of type Transformer
  Modifier and Type
  Method
  Description
  `static <E> Closure<E>`
  ClosureUtils.`asClosure(Transformer<? super E,?> transformer)`
  Creates a Closure that calls a Transformer each time it is called.
  `static <T> Predicate<T>`
  PredicateUtils.`asPredicate(Transformer<? super T,Boolean> transformer)`
  Creates a new Predicate that wraps a Transformer.
  `static <T> Transformer<T,T>`
  TransformerUtils.`chainedTransformer(Transformer<? super T,? extends T>... transformers)`
  Create a new Transformer that calls each transformer in turn, passing the result into the next transformer.
  `static <I, O, R extends Collection<? super O>>
  R`
  CollectionUtils.`collect(Iterable<? extends I> inputCollection, Transformer<? super I,? extends O> transformer, R outputCollection)`
  Transforms all elements from input collection with the given transformer and adds them to the output collection.
  `static <I, O> Collection<O>`
  CollectionUtils.`collect(Iterable<I> inputCollection, Transformer<? super I,? extends O> transformer)`
  Returns a new Collection containing all elements of the input collection transformed by the given transformer.
  `static <I, O, R extends Collection<? super O>>
  R`
  CollectionUtils.`collect(Iterator<? extends I> inputIterator, Transformer<? super I,? extends O> transformer, R outputCollection)`
  Transforms all elements from the input iterator with the given transformer and adds them to the output collection.
  `static <I, O> Collection<O>`
  CollectionUtils.`collect(Iterator<I> inputIterator, Transformer<? super I,? extends O> transformer)`
  Transforms all elements from the input iterator with the given transformer and adds them to the output collection.
  `static <I, O> Transformer<I,O>`
  TransformerUtils.`ifTransformer(Predicate<? super I> predicate, Transformer<? super I,? extends O> trueTransformer, Transformer<? super I,? extends O> falseTransformer)`
  Create a new Transformer that calls one of two transformers depending on the specified predicate.
  `static <T> Transformer<T,T>`
  TransformerUtils.`ifTransformer(Predicate<? super T> predicate, Transformer<? super T,? extends T> trueTransformer)`
  Create a new Transformer that calls the transformer if the predicate is true, otherwise the input object is returned unchanged.
  `static <E> List<E>`
  ListUtils.`lazyList(List<E> list, Transformer<Integer,? extends E> transformer)`
  Returns a "lazy" list whose elements will be created on demand.
  `static <K, V> IterableMap<K,V>`
  MapUtils.`lazyMap(Map<K,V> map, Transformer<? super K,? extends V> transformerFactory)`
  Returns a "lazy" map whose values will be created on demand.
  `static <K, V> SortedMap<K,V>`
  MapUtils.`lazySortedMap(SortedMap<K,V> map, Transformer<? super K,? extends V> transformerFactory)`
  Returns a "lazy" sorted map whose values will be created on demand.
  `static <E> Iterator<E>`
  IteratorUtils.`objectGraphIterator(E root, Transformer<? super E,? extends E> transformer)`
  Gets an iterator that operates over an object graph.
  `static <K, V, E> void`
  MapUtils.`populateMap(Map<K,V> map, Iterable<? extends E> elements, Transformer<E,K> keyTransformer, Transformer<E,V> valueTransformer)`
  Populates a Map using the supplied `Transformer`s to transform the elements into keys and values.
  `static <K, V> void`
  MapUtils.`populateMap(Map<K,V> map, Iterable<? extends V> elements, Transformer<V,K> keyTransformer)`
  Populates a Map using the supplied `Transformer` to transform the elements into keys, using the unaltered element as the value in the `Map`.
  `static <K, V, E> void`
  MapUtils.`populateMap(MultiMap<K,V> map, Iterable<? extends E> elements, Transformer<E,K> keyTransformer, Transformer<E,V> valueTransformer)`
  Populates a MultiMap using the supplied `Transformer`s to transform the elements into keys and values.
  `static <K, V> void`
  MapUtils.`populateMap(MultiMap<K,V> map, Iterable<? extends V> elements, Transformer<V,K> keyTransformer)`
  Populates a MultiMap using the supplied `Transformer` to transform the elements into keys, using the unaltered element as the value in the `MultiMap`.
  `static <I, O> Transformer<I,O>`
  TransformerUtils.`switchTransformer(Predicate<? super I>[] predicates, Transformer<? super I,? extends O>[] transformers)`
  Create a new Transformer that calls one of the transformers depending on the predicates.
  `static <I, O> Transformer<I,O>`
  TransformerUtils.`switchTransformer(Predicate<? super I>[] predicates, Transformer<? super I,? extends O>[] transformers, Transformer<? super I,? extends O> defaultTransformer)`
  Create a new Transformer that calls one of the transformers depending on the predicates.
  `static <I, O> Transformer<I,O>`
  TransformerUtils.`switchTransformer(Predicate<? super I> predicate, Transformer<? super I,? extends O> trueTransformer, Transformer<? super I,? extends O> falseTransformer)`
  Deprecated.
  as of 4.1, use `TransformerUtils.ifTransformer(Predicate, Transformer, Transformer)`
  `static <E> String`
  IterableUtils.`toString(Iterable<E> iterable, Transformer<? super E,String> transformer)`
  Returns a string representation of the elements of the specified iterable.
  `static <E> String`
  IterableUtils.`toString(Iterable<E> iterable, Transformer<? super E,String> transformer, String delimiter, String prefix, String suffix)`
  Returns a string representation of the elements of the specified iterable.
  `static <E> String`
  IteratorUtils.`toString(Iterator<E> iterator, Transformer<? super E,String> transformer)`
  Returns a string representation of the elements of the specified iterator.
  `static <E> String`
  IteratorUtils.`toString(Iterator<E> iterator, Transformer<? super E,String> transformer, String delimiter, String prefix, String suffix)`
  Returns a string representation of the elements of the specified iterator.
  `static <C> void`
  CollectionUtils.`transform(Collection<C> collection, Transformer<? super C,? extends C> transformer)`
  Transform the collection by applying a Transformer to each element.
  `<O> FluentIterable<O>`
  FluentIterable.`transform(Transformer<? super E,? extends O> transformer)`
  Returns a new FluentIterable whose iterator will return all elements of this iterable transformed by the provided transformer.
  `static <I, O> Comparator<I>`
  ComparatorUtils.`transformedComparator(Comparator<O> comparator, Transformer<? super I,? extends O> transformer)`
  Gets a Comparator that passes transformed objects to the given comparator.
  `static <I, O> Iterable<O>`
  IterableUtils.`transformedIterable(Iterable<I> iterable, Transformer<? super I,? extends O> transformer)`
  Returns a transformed view of the given iterable where all of its elements have been transformed by the provided transformer.
  `static <I, O> Iterator<O>`
  IteratorUtils.`transformedIterator(Iterator<? extends I> iterator, Transformer<? super I,? extends O> transformer)`
  Gets an iterator that transforms the elements of another iterator.
  `static <E> List<E>`
  ListUtils.`transformedList(List<E> list, Transformer<? super E,? extends E> transformer)`
  Returns a transformed list backed by the given list.
  `static <K, V> IterableMap<K,V>`
  MapUtils.`transformedMap(Map<K,V> map, Transformer<? super K,? extends K> keyTransformer, Transformer<? super V,? extends V> valueTransformer)`
  Returns a transformed map backed by the given map.
  `static <K, V> MultiValuedMap<K,V>`
  MultiMapUtils.`transformedMultiValuedMap(MultiValuedMap<K,V> map, Transformer<? super K,? extends K> keyTransformer, Transformer<? super V,? extends V> valueTransformer)`
  Returns a `TransformedMultiValuedMap` backed by the given map.
  `static <E> SortedSet<E>`
  SetUtils.`transformedNavigableSet(NavigableSet<E> set, Transformer<? super E,? extends E> transformer)`
  Returns a transformed navigable set backed by the given navigable set.
  `static <T> Predicate<T>`
  PredicateUtils.`transformedPredicate(Transformer<? super T,? extends T> transformer, Predicate<? super T> predicate)`
  Creates a predicate that transforms the input object before passing it to the predicate.
  `static <E> Set<E>`
  SetUtils.`transformedSet(Set<E> set, Transformer<? super E,? extends E> transformer)`
  Returns a transformed set backed by the given set.
  `static <K, V> SortedMap<K,V>`
  MapUtils.`transformedSortedMap(SortedMap<K,V> map, Transformer<? super K,? extends K> keyTransformer, Transformer<? super V,? extends V> valueTransformer)`
  Returns a transformed sorted map backed by the given map.
  `static <E> SortedSet<E>`
  SetUtils.`transformedSortedSet(SortedSet<E> set, Transformer<? super E,? extends E> transformer)`
  Returns a transformed sorted set backed by the given set.
  `static <E> Bag<E>`
  BagUtils.`transformingBag(Bag<E> bag, Transformer<? super E,? extends E> transformer)`
  Deprecated.
  Returns a transformed bag backed by the given bag.
  `static <E> Collection<E>`
  CollectionUtils.`transformingCollection(Collection<E> collection, Transformer<? super E,? extends E> transformer)`
  Returns a transformed bag backed by the given collection.
  `static <E> MultiSet<E>`
  MultiSetUtils.`transformingMultiSet(MultiSet<E> multiset, Transformer<? super E,? extends E> transformer)`
  Returns a transformed multiset backed by the given multiset.
  `static <E> Queue<E>`
  QueueUtils.`transformingQueue(Queue<E> queue, Transformer<? super E,? extends E> transformer)`
  Returns a transformed queue backed by the given queue.
  `static <E> SortedBag<E>`
  BagUtils.`transformingSortedBag(SortedBag<E> bag, Transformer<? super E,? extends E> transformer)`
  Deprecated.
  Returns a transformed sorted bag backed by the given bag.
  `static <E> SortedMultiSet<E>`
  MultiSetUtils.`transformingSortedMultiSet(SortedMultiSet<E> multiset, Transformer<? super E,? extends E> transformer)`
  Returns a transformed sorted multiset backed by the given multiset.
  Method parameters in org.apache.commons.collections4 with type arguments of type Transformer
  Modifier and Type
  Method
  Description
  `static <T> Transformer<T,T>`
  TransformerUtils.`chainedTransformer(Collection<? extends Transformer<? super T,? extends T>> transformers)`
  Create a new Transformer that calls each transformer in turn, passing the result into the next transformer.
  `static <I, O> Transformer<I,O>`
  TransformerUtils.`switchMapTransformer(Map<I,Transformer<I,O>> objectsAndTransformers)`
  Create a new Transformer that uses the input object as a key to find the transformer to call.
  `static <I, O> Transformer<I,O>`
  TransformerUtils.`switchTransformer(Map<Predicate<I>,Transformer<I,O>> predicatesAndTransformers)`
  Create a new Transformer that calls one of the transformers depending on the predicates.

- ## Uses of Transformer in org.apache.commons.collections4.bag

  Methods in org.apache.commons.collections4.bag with parameters of type Transformer
  Modifier and Type
  Method
  Description
  `static <E> Bag<E>`
  TransformedBag.`transformedBag(Bag<E> bag, Transformer<? super E,? extends E> transformer)`
  Deprecated.
  Factory method to create a transforming bag that will transform existing contents of the specified bag.
  `static <E> TransformedSortedBag<E>`
  TransformedSortedBag.`transformedSortedBag(SortedBag<E> bag, Transformer<? super E,? extends E> transformer)`
  Deprecated.
  Factory method to create a transforming sorted bag that will transform existing contents of the specified sorted bag.
  `static <E> Bag<E>`
  TransformedBag.`transformingBag(Bag<E> bag, Transformer<? super E,? extends E> transformer)`
  Deprecated.
  Factory method to create a transforming bag.
  `static <E> TransformedSortedBag<E>`
  TransformedSortedBag.`transformingSortedBag(SortedBag<E> bag, Transformer<? super E,? extends E> transformer)`
  Deprecated.
  Factory method to create a transforming sorted bag.
  Constructors in org.apache.commons.collections4.bag with parameters of type Transformer
  Modifier
  Constructor
  Description
  `protected`
  `TransformedBag(Bag<E> bag, Transformer<? super E,? extends E> transformer)`
  Deprecated.
  Constructor that wraps (not copies).
  `protected`
  `TransformedSortedBag(SortedBag<E> bag, Transformer<? super E,? extends E> transformer)`
  Deprecated.
  Constructor that wraps (not copies).

- ## Uses of Transformer in org.apache.commons.collections4.collection

  Fields in org.apache.commons.collections4.collection declared as Transformer
  Modifier and Type
  Field
  Description
  `protected final Transformer<? super E,? extends E>`
  TransformedCollection.`transformer`
  The transformer to use
  Methods in org.apache.commons.collections4.collection with parameters of type Transformer
  Modifier and Type
  Method
  Description
  `static <K, C> IndexedCollection<K,C>`
  IndexedCollection.`nonUniqueIndexedCollection(Collection<C> coll, Transformer<C,K> keyTransformer)`
  Creates an `IndexedCollection` for a non-unique index.
  `static <E> TransformedCollection<E>`
  TransformedCollection.`transformedCollection(Collection<E> collection, Transformer<? super E,? extends E> transformer)`
  Creates a transforming collection that will transform existing contents of the specified collection.
  `static <E> TransformedCollection<E>`
  TransformedCollection.`transformingCollection(Collection<E> coll, Transformer<? super E,? extends E> transformer)`
  Creates a transforming collection.
  `static <K, C> IndexedCollection<K,C>`
  IndexedCollection.`uniqueIndexedCollection(Collection<C> coll, Transformer<C,K> keyTransformer)`
  Creates an `IndexedCollection` for a unique index.
  Constructors in org.apache.commons.collections4.collection with parameters of type Transformer
  Modifier
  Constructor
  Description
  ``
  `IndexedCollection(Collection<C> coll, Transformer<C,K> keyTransformer, MultiMap<K,C> map, boolean uniqueIndex)`
  Creates a `IndexedCollection`.
  `protected`
  `TransformedCollection(Collection<E> collection, Transformer<? super E,? extends E> transformer)`
  Constructs and wraps (not copies).

- ## Uses of Transformer in org.apache.commons.collections4.comparators

  Constructors in org.apache.commons.collections4.comparators with parameters of type Transformer
  Modifier
  Constructor
  Description
  ``
  `TransformingComparator(Transformer<? super I,? extends O> transformer)`
  Constructs an instance with the given Transformer and a `ComparableComparator`.
  ``
  `TransformingComparator(Transformer<? super I,? extends O> transformer, Comparator<O> decorated)`
  Constructs an instance with the given Transformer and Comparator.

- ## Uses of Transformer in org.apache.commons.collections4.functors

  Classes in org.apache.commons.collections4.functors that implement Transformer
  Modifier and Type
  Class
  Description
  `class`
  `ChainedTransformer<T>`
  Transformer implementation that chains the specified transformers together.
  `class`
  `CloneTransformer<T>`
  Transformer implementation that returns a clone of the input object.
  `class`
  `ClosureTransformer<T>`
  Transformer implementation that calls a Closure using the input object and then returns the input.
  `class`
  `ConstantTransformer<T,R>`
  Transformer implementation that returns the same constant each time.
  `final class`
  `ExceptionTransformer<T,R>`
  Transformer implementation that always throws an exception.
  `class`
  `FactoryTransformer<T,R>`
  Transformer implementation that calls a Factory and returns the result.
  `class`
  `IfTransformer<T,R>`
  Transformer implementation that will call one of two closures based on whether a predicate evaluates as true or false.
  `class`
  `InstantiateTransformer<T>`
  Transformer implementation that creates a new object instance by reflection.
  `class`
  `InvokerTransformer<T,R>`
  Transformer implementation that creates a new object instance by reflection.
  `final class`
  `MapTransformer<T,R>`
  Transformer implementation that returns the value held in a specified map using the input parameter as a key.
  `class`
  `NOPTransformer<T>`
  Transformer implementation that does nothing.
  `class`
  `PredicateTransformer<T>`
  Transformer implementation that calls a Predicate using the input object and then returns the result.
  `final class`
  `StringValueTransformer<T>`
  Transformer implementation that returns the result of calling `String.valueOf` on the input object.
  `class`
  `SwitchTransformer<T,R>`
  Transformer implementation calls the transformer whose predicate returns true, like a switch statement.
  Fields in org.apache.commons.collections4.functors declared as Transformer
  Modifier and Type
  Field
  Description
  `static final Transformer`
  CloneTransformer.`INSTANCE`
  Singleton predicate instance
  `static final Transformer`
  ExceptionTransformer.`INSTANCE`
  Singleton predicate instance
  `static final Transformer`
  NOPTransformer.`INSTANCE`
  Singleton predicate instance
  `static final Transformer`
  ConstantTransformer.`NULL_INSTANCE`
  Returns null each time
  Methods in org.apache.commons.collections4.functors that return Transformer
  Modifier and Type
  Method
  Description
  `static <T> Transformer<T,T>`
  ChainedTransformer.`chainedTransformer(Collection<? extends Transformer<? super T,? extends T>> transformers)`
  Create a new Transformer that calls each transformer in turn, passing the result into the next transformer.
  `static <T> Transformer<T,T>`
  ChainedTransformer.`chainedTransformer(Transformer<? super T,? extends T>... transformers)`
  Factory method that performs validation and copies the parameter array.
  `static <T> Transformer<T,T>`
  CloneTransformer.`cloneTransformer()`
  Factory returning the singleton instance.
  `static <T> Transformer<T,T>`
  ClosureTransformer.`closureTransformer(Closure<? super T> closure)`
  Factory method that performs validation.
  `static <I, O> Transformer<I,O>`
  ConstantTransformer.`constantTransformer(O constantToReturn)`
  Transformer method that performs validation.
  `static <I, O> Transformer<I,O>`
  ExceptionTransformer.`exceptionTransformer()`
  Factory returning the singleton instance.
  `static <I, O> Transformer<I,O>`
  FactoryTransformer.`factoryTransformer(Factory<? extends O> factory)`
  Factory method that performs validation.
  `Transformer<? super T,? extends R>`
  SwitchTransformer.`getDefaultTransformer()`
  Gets the default transformer.
  `Transformer<? super T,? extends R>`
  IfTransformer.`getFalseTransformer()`
  Gets the transformer used when false.
  `Transformer<? super T,? extends T>`
  TransformedPredicate.`getTransformer()`
  Gets the transformer in use.
  `Transformer<? super T,?>`
  TransformerClosure.`getTransformer()`
  Gets the transformer.
  `Transformer<? super T,Boolean>`
  TransformerPredicate.`getTransformer()`
  Gets the transformer.
  `Transformer<? super T,? extends T>[]`
  ChainedTransformer.`getTransformers()`
  Gets the transformers.
  `Transformer<? super T,? extends R>[]`
  SwitchTransformer.`getTransformers()`
  Gets the transformers.
  `Transformer<? super T,? extends R>`
  IfTransformer.`getTrueTransformer()`
  Gets the transformer used when true.
  `static <I, O> Transformer<I,O>`
  IfTransformer.`ifTransformer(Predicate<? super I> predicate, Transformer<? super I,? extends O> trueTransformer, Transformer<? super I,? extends O> falseTransformer)`
  Factory method that performs validation.
  `static <T> Transformer<T,T>`
  IfTransformer.`ifTransformer(Predicate<? super T> predicate, Transformer<? super T,? extends T> trueTransformer)`
  Factory method that performs validation.
  `static <T> Transformer<Class<? extends T>,T>`
  InstantiateTransformer.`instantiateTransformer()`
  Gets a typed no-arg instance.
  `static <T> Transformer<Class<? extends T>,T>`
  InstantiateTransformer.`instantiateTransformer(Class<?>[] paramTypes, Object[] args)`
  Transformer method that performs validation.
  `static <I, O> Transformer<I,O>`
  InvokerTransformer.`invokerTransformer(String methodName)`
  Gets an instance of this transformer calling a specific method with no arguments.
  `static <I, O> Transformer<I,O>`
  InvokerTransformer.`invokerTransformer(String methodName, Class<?>[] paramTypes, Object[] args)`
  Gets an instance of this transformer calling a specific method with specific values.
  `static <I, O> Transformer<I,O>`
  MapTransformer.`mapTransformer(Map<? super I,? extends O> map)`
  Creates the transformer.
  `static <T> Transformer<T,T>`
  NOPTransformer.`nopTransformer()`
  Factory returning the singleton instance.
  `static <I, O> Transformer<I,O>`
  ConstantTransformer.`nullTransformer()`
  Gets a typed null instance.
  `static <T> Transformer<T,Boolean>`
  PredicateTransformer.`predicateTransformer(Predicate<? super T> predicate)`
  Factory method that performs validation.
  `static <T> Transformer<T,String>`
  StringValueTransformer.`stringValueTransformer()`
  Factory returning the singleton instance.
  `static <I, O> Transformer<I,O>`
  SwitchTransformer.`switchTransformer(Map<? extends Predicate<? super I>,? extends Transformer<? super I,? extends O>> map)`
  Create a new Transformer that calls one of the transformers depending on the predicates.
  `static <I, O> Transformer<I,O>`
  SwitchTransformer.`switchTransformer(Predicate<? super I>[] predicates, Transformer<? super I,? extends O>[] transformers, Transformer<? super I,? extends O> defaultTransformer)`
  Factory method that performs validation and copies the parameter arrays.
  Methods in org.apache.commons.collections4.functors with parameters of type Transformer
  Modifier and Type
  Method
  Description
  `static <T> Transformer<T,T>`
  ChainedTransformer.`chainedTransformer(Transformer<? super T,? extends T>... transformers)`
  Factory method that performs validation and copies the parameter array.
  `static <I, O> Transformer<I,O>`
  IfTransformer.`ifTransformer(Predicate<? super I> predicate, Transformer<? super I,? extends O> trueTransformer, Transformer<? super I,? extends O> falseTransformer)`
  Factory method that performs validation.
  `static <T> Transformer<T,T>`
  IfTransformer.`ifTransformer(Predicate<? super T> predicate, Transformer<? super T,? extends T> trueTransformer)`
  Factory method that performs validation.
  `static <I, O> Transformer<I,O>`
  SwitchTransformer.`switchTransformer(Predicate<? super I>[] predicates, Transformer<? super I,? extends O>[] transformers, Transformer<? super I,? extends O> defaultTransformer)`
  Factory method that performs validation and copies the parameter arrays.
  `static <T> Predicate<T>`
  TransformedPredicate.`transformedPredicate(Transformer<? super T,? extends T> transformer, Predicate<? super T> predicate)`
  Creates the predicate.
  `static <E> Closure<E>`
  TransformerClosure.`transformerClosure(Transformer<? super E,?> transformer)`
  Factory method that performs validation.
  `static <T> Predicate<T>`
  TransformerPredicate.`transformerPredicate(Transformer<? super T,Boolean> transformer)`
  Creates the predicate.
  Method parameters in org.apache.commons.collections4.functors with type arguments of type Transformer
  Modifier and Type
  Method
  Description
  `static <T> Transformer<T,T>`
  ChainedTransformer.`chainedTransformer(Collection<? extends Transformer<? super T,? extends T>> transformers)`
  Create a new Transformer that calls each transformer in turn, passing the result into the next transformer.
  `static <I, O> Transformer<I,O>`
  SwitchTransformer.`switchTransformer(Map<? extends Predicate<? super I>,? extends Transformer<? super I,? extends O>> map)`
  Create a new Transformer that calls one of the transformers depending on the predicates.
  Constructors in org.apache.commons.collections4.functors with parameters of type Transformer
  Modifier
  Constructor
  Description
  ``
  `ChainedTransformer(Transformer<? super T,? extends T>... transformers)`
  Constructor that performs no validation.
  ``
  `IfTransformer(Predicate<? super T> predicate, Transformer<? super T,? extends R> trueTransformer, Transformer<? super T,? extends R> falseTransformer)`
  Constructor that performs no validation.
  ``
  `SwitchTransformer(Predicate<? super T>[] predicates, Transformer<? super T,? extends R>[] transformers, Transformer<? super T,? extends R> defaultTransformer)`
  Constructor that performs no validation.
  ``
  `TransformedPredicate(Transformer<? super T,? extends T> transformer, Predicate<? super T> predicate)`
  Constructor that performs no validation.
  ``
  `TransformerClosure(Transformer<? super T,?> transformer)`
  Constructor that performs no validation.
  ``
  `TransformerPredicate(Transformer<? super T,Boolean> transformer)`
  Constructor that performs no validation.

- ## Uses of Transformer in org.apache.commons.collections4.iterators

  Methods in org.apache.commons.collections4.iterators that return Transformer
  Modifier and Type
  Method
  Description
  `Transformer<? super I,? extends O>`
  TransformIterator.`getTransformer()`
  Gets the transformer this iterator is using.
  Methods in org.apache.commons.collections4.iterators with parameters of type Transformer
  Modifier and Type
  Method
  Description
  `void`
  TransformIterator.`setTransformer(Transformer<? super I,? extends O> transformer)`
  Sets the transformer this the iterator to use.
  Constructors in org.apache.commons.collections4.iterators with parameters of type Transformer
  Modifier
  Constructor
  Description
  ``
  `ObjectGraphIterator(E root, Transformer<? super E,? extends E> transformer)`
  Constructs an ObjectGraphIterator using a root object and transformer.
  ``
  `TransformIterator(Iterator<? extends I> iterator, Transformer<? super I,? extends O> transformer)`
  Constructs a new `TransformIterator` that will use the given iterator and transformer.

- ## Uses of Transformer in org.apache.commons.collections4.list

  Methods in org.apache.commons.collections4.list with parameters of type Transformer
  Modifier and Type
  Method
  Description
  `static <E> LazyList<E>`
  LazyList.`lazyList(List<E> list, Transformer<Integer,? extends E> transformer)`
  Transformer method to create a lazily instantiating list.
  `static <E> TransformedList<E>`
  TransformedList.`transformedList(List<E> list, Transformer<? super E,? extends E> transformer)`
  Factory method to create a transforming list that will transform existing contents of the specified list.
  `static <E> TransformedList<E>`
  TransformedList.`transformingList(List<E> list, Transformer<? super E,? extends E> transformer)`
  Factory method to create a transforming list.
  Constructors in org.apache.commons.collections4.list with parameters of type Transformer
  Modifier
  Constructor
  Description
  `protected`
  `LazyList(List<E> list, Transformer<Integer,? extends E> transformer)`
  Constructor that wraps (not copies).
  `protected`
  `TransformedList(List<E> list, Transformer<? super E,? extends E> transformer)`
  Constructor that wraps (not copies).

- ## Uses of Transformer in org.apache.commons.collections4.map

  Fields in org.apache.commons.collections4.map declared as Transformer
  Modifier and Type
  Field
  Description
  `protected final Transformer<? super K,? extends V>`
  LazyMap.`factory`
  The factory to use to construct elements
  `protected final Transformer<? super K,? extends K>`
  TransformedMap.`keyTransformer`
  The transformer to use for the key
  `protected final Transformer<? super V,? extends V>`
  TransformedMap.`valueTransformer`
  The transformer to use for the value
  Methods in org.apache.commons.collections4.map with parameters of type Transformer
  Modifier and Type
  Method
  Description
  `static <K, V> Map<K,V>`
  DefaultedMap.`defaultedMap(Map<K,V> map, Transformer<? super K,? extends V> transformer)`
  Factory method to create a defaulting map.
  `static <V, K> LazyMap<K,V>`
  LazyMap.`lazyMap(Map<K,V> map, Transformer<? super K,? extends V> factory)`
  Factory method to create a lazily instantiated map.
  `static <K, V> LazySortedMap<K,V>`
  LazySortedMap.`lazySortedMap(SortedMap<K,V> map, Transformer<? super K,? extends V> factory)`
  Factory method to create a lazily instantiated sorted map.
  `static <K, V> TransformedMap<K,V>`
  TransformedMap.`transformedMap(Map<K,V> map, Transformer<? super K,? extends K> keyTransformer, Transformer<? super V,? extends V> valueTransformer)`
  Factory method to create a transforming map that will transform existing contents of the specified map.
  `static <K, V> TransformedSortedMap<K,V>`
  TransformedSortedMap.`transformedSortedMap(SortedMap<K,V> map, Transformer<? super K,? extends K> keyTransformer, Transformer<? super V,? extends V> valueTransformer)`
  Factory method to create a transforming sorted map that will transform existing contents of the specified map.
  `static <K, V> TransformedMap<K,V>`
  TransformedMap.`transformingMap(Map<K,V> map, Transformer<? super K,? extends K> keyTransformer, Transformer<? super V,? extends V> valueTransformer)`
  Factory method to create a transforming map.
  `static <K, V> TransformedSortedMap<K,V>`
  TransformedSortedMap.`transformingSortedMap(SortedMap<K,V> map, Transformer<? super K,? extends K> keyTransformer, Transformer<? super V,? extends V> valueTransformer)`
  Factory method to create a transforming sorted map.
  Constructors in org.apache.commons.collections4.map with parameters of type Transformer
  Modifier
  Constructor
  Description
  `protected`
  `DefaultedMap(Map<K,V> map, Transformer<? super K,? extends V> defaultValueTransformer)`
  Constructor that wraps (not copies).
  ``
  `DefaultedMap(Transformer<? super K,? extends V> defaultValueTransformer)`
  Constructs a new empty `DefaultedMap` that decorates a `HashMap`.
  `protected`
  `LazyMap(Map<K,V> map, Transformer<? super K,? extends V> factory)`
  Constructor that wraps (not copies).
  `protected`
  `LazySortedMap(SortedMap<K,V> map, Transformer<? super K,? extends V> factory)`
  Constructor that wraps (not copies).
  `protected`
  `TransformedMap(Map<K,V> map, Transformer<? super K,? extends K> keyTransformer, Transformer<? super V,? extends V> valueTransformer)`
  Constructor that wraps (not copies).
  `protected`
  `TransformedSortedMap(SortedMap<K,V> map, Transformer<? super K,? extends K> keyTransformer, Transformer<? super V,? extends V> valueTransformer)`
  Constructor that wraps (not copies).

- ## Uses of Transformer in org.apache.commons.collections4.multimap

  Methods in org.apache.commons.collections4.multimap with parameters of type Transformer
  Modifier and Type
  Method
  Description
  `static <K, V> TransformedMultiValuedMap<K,V>`
  TransformedMultiValuedMap.`transformedMap(MultiValuedMap<K,V> map, Transformer<? super K,? extends K> keyTransformer, Transformer<? super V,? extends V> valueTransformer)`
  Factory method to create a transforming MultiValuedMap that will transform existing contents of the specified map.
  `static <K, V> TransformedMultiValuedMap<K,V>`
  TransformedMultiValuedMap.`transformingMap(MultiValuedMap<K,V> map, Transformer<? super K,? extends K> keyTransformer, Transformer<? super V,? extends V> valueTransformer)`
  Factory method to create a transforming MultiValuedMap.
  Constructors in org.apache.commons.collections4.multimap with parameters of type Transformer
  Modifier
  Constructor
  Description
  `protected`
  `TransformedMultiValuedMap(MultiValuedMap<K,V> map, Transformer<? super K,? extends K> keyTransformer, Transformer<? super V,? extends V> valueTransformer)`
  Constructor that wraps (not copies).

- ## Uses of Transformer in org.apache.commons.collections4.multiset

  Methods in org.apache.commons.collections4.multiset with parameters of type Transformer
  Modifier and Type
  Method
  Description
  `static <E> TransformedMultiSet<E>`
  TransformedMultiSet.`transformedMultiSet(MultiSet<E> multiset, Transformer<? super E,? extends E> transformer)`
  Factory method to create a transforming multiset that will transform existing contents of the specified multiset.
  `static <E> TransformedSortedMultiSet<E>`
  TransformedSortedMultiSet.`transformedSortedMultiSet(SortedMultiSet<E> multiset, Transformer<? super E,? extends E> transformer)`
  Factory method to create a transforming sorted multiset that will transform existing contents of the specified sorted multiset.
  `static <E> TransformedMultiSet<E>`
  TransformedMultiSet.`transformingMultiSet(MultiSet<E> multiset, Transformer<? super E,? extends E> transformer)`
  Factory method to create a transforming multiset.
  `static <E> TransformedSortedMultiSet<E>`
  TransformedSortedMultiSet.`transformingSortedMultiSet(SortedMultiSet<E> multiset, Transformer<? super E,? extends E> transformer)`
  Factory method to create a transforming sorted multiset.
  Constructors in org.apache.commons.collections4.multiset with parameters of type Transformer
  Modifier
  Constructor
  Description
  `protected`
  `TransformedMultiSet(MultiSet<E> multiset, Transformer<? super E,? extends E> transformer)`
  Constructor that wraps (not copies).
  `protected`
  `TransformedSortedMultiSet(SortedMultiSet<E> multiset, Transformer<? super E,? extends E> transformer)`
  Constructor that wraps (not copies).

- ## Uses of Transformer in org.apache.commons.collections4.queue

  Methods in org.apache.commons.collections4.queue with parameters of type Transformer
  Modifier and Type
  Method
  Description
  `static <E> TransformedQueue<E>`
  TransformedQueue.`transformedQueue(Queue<E> queue, Transformer<? super E,? extends E> transformer)`
  Factory method to create a transforming queue that will transform existing contents of the specified queue.
  `static <E> TransformedQueue<E>`
  TransformedQueue.`transformingQueue(Queue<E> queue, Transformer<? super E,? extends E> transformer)`
  Factory method to create a transforming queue.
  Constructors in org.apache.commons.collections4.queue with parameters of type Transformer
  Modifier
  Constructor
  Description
  `protected`
  `TransformedQueue(Queue<E> queue, Transformer<? super E,? extends E> transformer)`
  Constructor that wraps (not copies).

- ## Uses of Transformer in org.apache.commons.collections4.set

  Methods in org.apache.commons.collections4.set with parameters of type Transformer
  Modifier and Type
  Method
  Description
  `static <E> TransformedNavigableSet<E>`
  TransformedNavigableSet.`transformedNavigableSet(NavigableSet<E> set, Transformer<? super E,? extends E> transformer)`
  Factory method to create a transforming navigable set that will transform existing contents of the specified navigable set.
  `static <E> Set<E>`
  TransformedSet.`transformedSet(Set<E> set, Transformer<? super E,? extends E> transformer)`
  Factory method to create a transforming set that will transform existing contents of the specified set.
  `static <E> TransformedSortedSet<E>`
  TransformedSortedSet.`transformedSortedSet(SortedSet<E> set, Transformer<? super E,? extends E> transformer)`
  Factory method to create a transforming sorted set that will transform existing contents of the specified sorted set.
  `static <E> TransformedNavigableSet<E>`
  TransformedNavigableSet.`transformingNavigableSet(NavigableSet<E> set, Transformer<? super E,? extends E> transformer)`
  Factory method to create a transforming navigable set.
  `static <E> TransformedSet<E>`
  TransformedSet.`transformingSet(Set<E> set, Transformer<? super E,? extends E> transformer)`
  Factory method to create a transforming set.
  `static <E> TransformedSortedSet<E>`
  TransformedSortedSet.`transformingSortedSet(SortedSet<E> set, Transformer<? super E,? extends E> transformer)`
  Factory method to create a transforming sorted set.
  Constructors in org.apache.commons.collections4.set with parameters of type Transformer
  Modifier
  Constructor
  Description
  `protected`
  `TransformedNavigableSet(NavigableSet<E> set, Transformer<? super E,? extends E> transformer)`
  Constructor that wraps (not copies).
  `protected`
  `TransformedSet(Set<E> set, Transformer<? super E,? extends E> transformer)`
  Constructor that wraps (not copies).
  `protected`
  `TransformedSortedSet(SortedSet<E> set, Transformer<? super E,? extends E> transformer)`
  Constructor that wraps (not copies).

- ## Uses of Transformer in org.apache.commons.collections4.splitmap

  Methods in org.apache.commons.collections4.splitmap with parameters of type Transformer
  Modifier and Type
  Method
  Description
  `static <J, K, U, V>
  TransformedSplitMap<J,K,U,V>`
  TransformedSplitMap.`transformingMap(Map<K,V> map, Transformer<? super J,? extends K> keyTransformer, Transformer<? super U,? extends V> valueTransformer)`
  Factory method to create a transforming map.
  Constructors in org.apache.commons.collections4.splitmap with parameters of type Transformer
  Modifier
  Constructor
  Description
  `protected`
  `TransformedSplitMap(Map<K,V> map, Transformer<? super J,? extends K> keyTransformer, Transformer<? super U,? extends V> valueTransformer)`
  Constructor that wraps (not copies).