TransformIterator (Apache Commons Collections 4.0 API)

java.lang.Object
- org.apache.commons.collections4.iterators.TransformIterator<I,O>

All Implemented Interfaces:

Iterator<O>
```
public class TransformIterator<I,O>
extends Object
implements Iterator<O>
```
Decorates an iterator such that each element returned is transformed.

Since:

1.0

Version:

$Id: TransformIterator.java 1477802 2013-04-30 20:01:28Z tn $

Constructor Summary

Constructors
Constructor and Description
`TransformIterator()` Constructs a new `TransformIterator` that will not function until the `setIterator` and `setTransformer(Transformer)` methods are invoked.
`TransformIterator(Iterator<? extends I> iterator)` Constructs a new `TransformIterator` that won't transform elements from the given iterator.
`TransformIterator(Iterator<? extends I> iterator, Transformer<? super I,? extends O> transformer)` Constructs a new `TransformIterator` that will use the given iterator and transformer.

Method Summary

Methods
Modifier and Type	Method and Description
`Iterator<? extends I>`	`getIterator()` Gets the iterator this iterator is using.
`Transformer<? super I,? extends O>`	`getTransformer()` Gets the transformer this iterator is using.
`boolean`	`hasNext()`
`O`	`next()` Gets the next object from the iteration, transforming it using the current transformer.
`void`	`remove()`
`void`	`setIterator(Iterator<? extends I> iterator)` Sets the iterator for this iterator to use.
`void`	`setTransformer(Transformer<? super I,? extends O> transformer)` Sets the transformer this the iterator to use.
`protected O`	`transform(I source)` Transforms the given object using the transformer.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - TransformIterator
```
public TransformIterator()
```
    Constructs a new TransformIterator that will not function until the setIterator and setTransformer(Transformer) methods are invoked.
  - TransformIterator
```
public TransformIterator(Iterator<? extends I> iterator)
```
    Constructs a new TransformIterator that won't transform elements from the given iterator.
    
    Parameters:
    iterator - the iterator to use
  - TransformIterator
```
public TransformIterator(Iterator<? extends I> iterator,
                 Transformer<? super I,? extends O> transformer)
```
    Constructs a new TransformIterator that will use the given iterator and transformer. If the given transformer is null, then objects will not be transformed.
    
    Parameters:
    iterator - the iterator to use
    transformer - the transformer to use
- Method Detail
  - hasNext
```
public boolean hasNext()
```
    Specified by:
    
    hasNext in interface Iterator<O>
  - next
```
public O next()
```
    Gets the next object from the iteration, transforming it using the current transformer. If the transformer is null, no transformation occurs and the object from the iterator is returned directly.
    
    Specified by:
    
    next in interface Iterator<O>
    
    Returns:
    the next object
    
    Throws:
    
    NoSuchElementException - if there are no more elements
  - remove
```
public void remove()
```
    Specified by:
    
    remove in interface Iterator<O>
  - getIterator
```
public Iterator<? extends I> getIterator()
```
    Gets the iterator this iterator is using.
    
    Returns:
    the iterator.
  - setIterator
```
public void setIterator(Iterator<? extends I> iterator)
```
    Sets the iterator for this iterator to use. If iteration has started, this effectively resets the iterator.
    
    Parameters:
    iterator - the iterator to use
  - getTransformer
```
public Transformer<? super I,? extends O> getTransformer()
```
    Gets the transformer this iterator is using.
    
    Returns:
    the transformer.
  - setTransformer
```
public void setTransformer(Transformer<? super I,? extends O> transformer)
```
    Sets the transformer this the iterator to use. A null transformer is a no-op transformer.
    
    Parameters:
    transformer - the transformer to use
  - transform
```
protected O transform(I source)
```
    Transforms the given object using the transformer. If the transformer is null, the original object is returned as-is.
    
    Parameters:
    source - the object to transform
    
    Returns:
    the transformed object

Class TransformIterator<I,O>

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

TransformIterator

TransformIterator

TransformIterator

Method Detail

hasNext

next

remove

getIterator

setIterator

getTransformer

setTransformer

transform