org.apache.commons.collections.iterators

Class TransformIterator

java.lang.Object

org.apache.commons.collections.iterators.ProxyIterator

org.apache.commons.collections.iterators.TransformIterator

All Implemented Interfaces:

java.util.Iterator

public class TransformIterator
extends ProxyIterator

A Proxy Iterator which uses a Transformer instance to transform the contents of the Iterator into some other form

Since:

1.0

Author:

James Strachan

Constructor Summary

Constructors

Constructor and Description
TransformIterator() Constructs a new TransformIterator that will not function until the setIterator method is invoked.
TransformIterator(java.util.Iterator iterator) Constructs a new TransformIterator that won't transform elements from the given iterator.
TransformIterator(java.util.Iterator iterator, Transformer transformer) Constructs a new TransformIterator that will use the given iterator and transformer.

Method Summary

Methods

Modifier and Type	Method and Description
Transformer	getTransformer() Getter for property transformer.
java.lang.Object	next() Returns the next element from the underlying iterator.
void	setTransformer(Transformer transformer) Setter for property transformer.
protected java.lang.Object	transform(java.lang.Object source) Transforms the given object using the transformer.

Methods inherited from class org.apache.commons.collections.iterators.ProxyIterator

getIterator, hasNext, remove, setIterator

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 method is invoked.

TransformIterator

public TransformIterator(java.util.Iterator iterator)

Constructs a new TransformIterator that won't transform elements from the given iterator.

Parameters:

iterator - the iterator to use

TransformIterator

public TransformIterator(java.util.Iterator iterator,
                 Transformer 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

getTransformer

public Transformer getTransformer()

Getter for property transformer.

Returns:

Value of property transformer.

next

public java.lang.Object next()

Description copied from class: ProxyIterator

Returns the next element from the underlying iterator.

Specified by:

next in interface java.util.Iterator

Overrides:

next in class ProxyIterator

Returns:

the next element from the underlying iterator

setTransformer

public void setTransformer(Transformer transformer)

Setter for property transformer.

Parameters:

transformer - New value of property transformer.

transform

protected java.lang.Object transform(java.lang.Object 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