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java.lang.Objectorg.apache.commons.collections4.collection.AbstractCollectionDecorator<E>
org.apache.commons.collections4.collection.TransformedCollection<E>
E
- the type of the elements in the collectionpublic class TransformedCollection<E>
Decorates another Collection
to transform objects that are added.
The add methods are affected by this class. Thus objects must be removed or searched for using their transformed form. For example, if the transformation converts Strings to Integers, you must use the Integer form to remove objects.
This class is Serializable from Commons Collections 3.1.
Field Summary | |
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protected Transformer<? super E,? extends E> |
transformer
The transformer to use |
Constructor Summary | |
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protected |
TransformedCollection(Collection<E> coll,
Transformer<? super E,? extends E> transformer)
Constructor that wraps (not copies). |
Method Summary | ||
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boolean |
add(E object)
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boolean |
addAll(Collection<? extends E> coll)
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protected Collection<E> |
transform(Collection<? extends E> coll)
Transforms a collection. |
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protected E |
transform(E object)
Transforms an object. |
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static
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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. |
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static
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transformingCollection(Collection<E> coll,
Transformer<? super E,? extends E> transformer)
Factory method to create a transforming collection. |
Methods inherited from class org.apache.commons.collections4.collection.AbstractCollectionDecorator |
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clear, contains, containsAll, decorated, equals, hashCode, isEmpty, iterator, remove, removeAll, retainAll, setCollection, size, toArray, toArray, toString |
Methods inherited from class java.lang.Object |
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clone, finalize, getClass, notify, notifyAll, wait, wait, wait |
Field Detail |
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protected final Transformer<? super E,? extends E> transformer
Constructor Detail |
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protected TransformedCollection(Collection<E> coll, Transformer<? super E,? extends E> transformer)
If there are any elements already in the collection being decorated, they are NOT transformed.
coll
- the collection to decorate, must not be nulltransformer
- the transformer to use for conversion, must not be null
IllegalArgumentException
- if collection or transformer is nullMethod Detail |
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public static <E> TransformedCollection<E> transformingCollection(Collection<E> coll, Transformer<? super E,? extends E> transformer)
If there are any elements already in the collection being decorated, they
are NOT transformed.
Contrast this with transformedCollection(Collection, Transformer)
.
E
- the type of the elements in the collectioncoll
- the collection to decorate, must not be nulltransformer
- the transformer to use for conversion, must not be null
IllegalArgumentException
- if collection or transformer is nullpublic static <E> TransformedCollection<E> transformedCollection(Collection<E> collection, Transformer<? super E,? extends E> transformer)
If there are any elements already in the collection being decorated, they
will be transformed by this method.
Contrast this with transformingCollection(Collection, Transformer)
.
E
- the type of the elements in the collectioncollection
- the collection to decorate, must not be nulltransformer
- the transformer to use for conversion, must not be null
IllegalArgumentException
- if collection or transformer is nullprotected E transform(E object)
The transformer itself may throw an exception if necessary.
object
- the object to transform
protected Collection<E> transform(Collection<? extends E> coll)
The transformer itself may throw an exception if necessary.
coll
- the collection to transform
public boolean add(E object)
add
in interface Collection<E>
add
in class AbstractCollectionDecorator<E>
public boolean addAll(Collection<? extends E> coll)
addAll
in interface Collection<E>
addAll
in class AbstractCollectionDecorator<E>
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