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

- Packages that use Transformer
  Package | Description
  --- | ---
  org.apache.commons.collections4 | This package contains the interfaces and utilities shared across all the subpackages of this component.
  org.apache.commons.collections4.bag | This package contains implementations of the `Bag` and `SortedBag` interfaces.
  org.apache.commons.collections4.collection | This package contains implementations of the `Collection` interface.
  org.apache.commons.collections4.comparators | This package contains implementations of the `Comparator` interface.
  org.apache.commons.collections4.functors | This package contains implementations of the `Closure`, `Predicate`, `Transformer` and `Factory` interfaces.
  org.apache.commons.collections4.iterators | This package contains implementations of the `Iterator` interface.
  org.apache.commons.collections4.list | This package contains implementations of the `List` interface.
  org.apache.commons.collections4.map | This package contains implementations of the `Map`, `IterableMap`, `OrderedMap` and `SortedMap` interfaces.
  org.apache.commons.collections4.multimap | This package contains implementations of the `MultiValuedMap` interfaces.
  org.apache.commons.collections4.queue | This package contains implementations for the `Queue` interface.
  org.apache.commons.collections4.set | This package contains implementations of the `Set`, `SortedSet` and `NavigableSet` interfaces.
  org.apache.commons.collections4.splitmap | The "split map" concept is that of an object that implements the `Put` and `Get` interfaces, with differing generic types.

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

    Methods in org.apache.commons.collections4 that return Transformer
    Modifier and Type | Method and 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 `java.lang.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 {@link #ifTransformer(Predicate, Transformer, Transformer))

    Methods in org.apache.commons.collections4 with parameters of type Transformer
    Modifier and Type | Method and 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)` Create 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 <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 <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,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,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>[] 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 {@link #ifTransformer(Predicate, Transformer, Transformer))
    `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 {@link #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> transform)` 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> 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 <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 <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)` 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> 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)` Returns a transformed sorted bag backed by the given bag.

    Method parameters in org.apache.commons.collections4 with type arguments of type Transformer
    Modifier and Type | Method and 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 and Description
    --- | ---
    `static <E> Bag<E>` | TransformedBag.`transformedBag(Bag<E> bag, Transformer<? super E,? extends E> transformer)` 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)` 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)` Factory method to create a transforming bag.
    `static <E> TransformedSortedBag<E>` | TransformedSortedBag.`transformingSortedBag(SortedBag<E> bag, Transformer<? super E,? extends E> transformer)` Factory method to create a transforming sorted bag.

    Constructors in org.apache.commons.collections4.bag with parameters of type Transformer
    Constructor and Description
    `TransformedBag(Bag<E> bag, Transformer<? super E,? extends E> transformer)` Constructor that wraps (not copies).
    `TransformedSortedBag(SortedBag<E> bag, Transformer<? super E,? extends E> transformer)` 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 and Description
    --- | ---
    `protected 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 and Description
    --- | ---
    `static <K,C> IndexedCollection<K,C>` | IndexedCollection.`nonUniqueIndexedCollection(Collection<C> coll, Transformer<C,K> keyTransformer)` Create an `IndexedCollection` for a non-unique index.
    `static <E> TransformedCollection<E>` | TransformedCollection.`transformedCollection(Collection<E> collection, Transformer<? super E,? extends E> transformer)` Factory method to create 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)` Factory method to create a transforming collection.
    `static <K,C> IndexedCollection<K,C>` | IndexedCollection.`uniqueIndexedCollection(Collection<C> coll, Transformer<C,K> keyTransformer)` Create an `IndexedCollection` for a unique index.

    Constructors in org.apache.commons.collections4.collection with parameters of type Transformer
    Constructor and Description
    `IndexedCollection(Collection<C> coll, Transformer<C,K> keyTransformer, MultiMap<K,C> map, boolean uniqueIndex)` Create a `IndexedCollection`.
    `TransformedCollection(Collection<E> coll, Transformer<? super E,? extends E> transformer)` Constructor that wraps (not copies).

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

    Constructors in org.apache.commons.collections4.comparators with parameters of type Transformer
    Constructor and 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 and 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<I,O>` Transformer implementation that returns the same constant each time.
    `class` | `ExceptionTransformer<I,O>` Transformer implementation that always throws an exception.
    `class` | `FactoryTransformer<I,O>` Transformer implementation that calls a Factory and returns the result.
    `class` | `IfTransformer<I,O>` 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<I,O>` Transformer implementation that creates a new object instance by reflection.
    `class` | `MapTransformer<I,O>` 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.
    `class` | `StringValueTransformer<T>` Transformer implementation that returns the result of calling `String.valueOf` on the input object.
    `class` | `SwitchTransformer<I,O>` 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 and Description
    --- | ---
    `static Transformer` | ExceptionTransformer.`INSTANCE` Singleton predicate instance
    `static Transformer` | NOPTransformer.`INSTANCE` Singleton predicate instance
    `static Transformer` | CloneTransformer.`INSTANCE` Singleton predicate instance
    `static Transformer` | ConstantTransformer.`NULL_INSTANCE` Returns null each time

    Methods in org.apache.commons.collections4.functors that return Transformer
    Modifier and Type | Method and 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 I,? extends O>` | SwitchTransformer.`getDefaultTransformer()` Gets the default transformer.
    `Transformer<? super I,? extends O>` | IfTransformer.`getFalseTransformer()` Gets the transformer used when false.
    `Transformer<? super T,? extends T>` | TransformedPredicate.`getTransformer()` Gets the transformer in use.
    `Transformer<? super T,Boolean>` | TransformerPredicate.`getTransformer()` Gets the transformer.
    `Transformer<? super E,?>` | TransformerClosure.`getTransformer()` Gets the transformer.
    `Transformer<? super I,? extends O>[]` | SwitchTransformer.`getTransformers()` Gets the transformers.
    `Transformer<? super T,? extends T>[]` | ChainedTransformer.`getTransformers()` Gets the transformers.
    `Transformer<? super I,? extends O>` | 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()` Get 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)` Factory to create the transformer.
    `static <T> Transformer<T,T>` | NOPTransformer.`nopTransformer()` Factory returning the singleton instance.
    `static <I,O> Transformer<I,O>` | ConstantTransformer.`nullTransformer()` Get 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 and 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 <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 <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)` Factory to create 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)` Factory to create the predicate.

    Method parameters in org.apache.commons.collections4.functors with type arguments of type Transformer
    Modifier and Type | Method and 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
    Constructor and Description
    `ChainedTransformer(Transformer<? super T,? extends T>... transformers)` Constructor that performs no validation.
    `IfTransformer(Predicate<? super I> predicate, Transformer<? super I,? extends O> trueTransformer, Transformer<? super I,? extends O> falseTransformer)` Constructor that performs no validation.
    `IfTransformer(Predicate<? super I> predicate, Transformer<? super I,? extends O> trueTransformer, Transformer<? super I,? extends O> falseTransformer)` Constructor that performs no validation.
    `SwitchTransformer(Predicate<? super I>[] predicates, Transformer<? super I,? extends O>[] transformers, Transformer<? super I,? extends O> defaultTransformer)` Constructor that performs no validation.
    `SwitchTransformer(Predicate<? super I>[] predicates, Transformer<? super I,? extends O>[] transformers, Transformer<? super I,? extends O> 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 E,?> 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 and 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 and 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
    Constructor and 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 and Description
    --- | ---
    `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
    Constructor and Description
    `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 and Description
    --- | ---
    `protected Transformer<? super K,? extends V>` | LazyMap.`factory` The factory to use to construct elements
    `protected Transformer<? super K,? extends K>` | TransformedMap.`keyTransformer` The transformer to use for the key
    `protected 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 and 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> 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> 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> 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.
    `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
    Constructor and Description
    `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`.
    `LazyMap(Map<K,V> map, Transformer<? super K,? extends V> factory)` Constructor that wraps (not copies).
    `LazySortedMap(SortedMap<K,V> map, Transformer<? super K,? extends V> factory)` Constructor that wraps (not copies).
    `TransformedMap(Map<K,V> map, Transformer<? super K,? extends K> keyTransformer, Transformer<? super V,? extends V> valueTransformer)` Constructor that wraps (not copies).
    `TransformedMap(Map<K,V> map, Transformer<? super K,? extends K> keyTransformer, Transformer<? super V,? extends V> valueTransformer)` Constructor that wraps (not copies).
    `TransformedSortedMap(SortedMap<K,V> map, Transformer<? super K,? extends K> keyTransformer, Transformer<? super V,? extends V> valueTransformer)` Constructor that wraps (not copies).
    `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 and 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.`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.
    `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
    Constructor and Description
    `TransformedMultiValuedMap(MultiValuedMap<K,V> map, Transformer<? super K,? extends K> keyTransformer, Transformer<? super V,? extends V> valueTransformer)` Constructor that wraps (not copies).
    `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.queue

    Methods in org.apache.commons.collections4.queue with parameters of type Transformer
    Modifier and Type | Method and 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
    Constructor and Description
    `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 and 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
    Constructor and Description
    `TransformedNavigableSet(NavigableSet<E> set, Transformer<? super E,? extends E> transformer)` Constructor that wraps (not copies).
    `TransformedSet(Set<E> set, Transformer<? super E,? extends E> transformer)` Constructor that wraps (not copies).
    `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 and 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.
    `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
    Constructor and Description
    `TransformedSplitMap(Map<K,V> map, Transformer<? super J,? extends K> keyTransformer, Transformer<? super U,? extends V> valueTransformer)` Constructor that wraps (not copies).
    `TransformedSplitMap(Map<K,V> map, Transformer<? super J,? extends K> keyTransformer, Transformer<? super U,? extends V> valueTransformer)` Constructor that wraps (not copies).

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