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 *      http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.commons.collections4.set;

import java.util.Iterator;
import java.util.NavigableSet;

import org.apache.commons.collections4.Transformer;

Decorates another NavigableSet 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.

Type parameters:
  • <E> – the type of the elements in this set
Since:4.1
/** * Decorates another <code>NavigableSet</code> to transform objects that are added. * <p> * 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. * * @param <E> the type of the elements in this set * @since 4.1 */
public class TransformedNavigableSet<E> extends TransformedSortedSet<E> implements NavigableSet<E> {
Serialization version
/** Serialization version */
private static final long serialVersionUID = 20150528L;
Factory method to create a transforming navigable set.

If there are any elements already in the set being decorated, they are NOT transformed. Contrast this with transformedNavigableSet(NavigableSet<Object>, Transformer<? super Object,? extends Object>).

Params:
  • set – the set to decorate, must not be null
  • transformer – the transformer to use for conversion, must not be null
Type parameters:
  • <E> – the element type
Throws:
Returns:a new transformed NavigableSet
/** * Factory method to create a transforming navigable set. * <p> * If there are any elements already in the set being decorated, they * are NOT transformed. * Contrast this with {@link #transformedNavigableSet(NavigableSet, Transformer)}. * * @param <E> the element type * @param set the set to decorate, must not be null * @param transformer the transformer to use for conversion, must not be null * @return a new transformed {@link NavigableSet} * @throws NullPointerException if set or transformer is null */
public static <E> TransformedNavigableSet<E> transformingNavigableSet(final NavigableSet<E> set, final Transformer<? super E, ? extends E> transformer) { return new TransformedNavigableSet<>(set, transformer); }
Factory method to create a transforming navigable set that will transform existing contents of the specified navigable set.

If there are any elements already in the set being decorated, they will be transformed by this method. Contrast this with transformingNavigableSet(NavigableSet<Object>, Transformer<? super Object,? extends Object>).

Params:
  • set – the set to decorate, must not be null
  • transformer – the transformer to use for conversion, must not be null
Type parameters:
  • <E> – the element type
Throws:
Returns:a new transformed NavigableSet
/** * Factory method to create a transforming navigable set that will transform * existing contents of the specified navigable set. * <p> * If there are any elements already in the set being decorated, they * will be transformed by this method. * Contrast this with {@link #transformingNavigableSet(NavigableSet, Transformer)}. * * @param <E> the element type * @param set the set to decorate, must not be null * @param transformer the transformer to use for conversion, must not be null * @return a new transformed {@link NavigableSet} * @throws NullPointerException if set or transformer is null */
public static <E> TransformedNavigableSet<E> transformedNavigableSet(final NavigableSet<E> set, final Transformer<? super E, ? extends E> transformer) { final TransformedNavigableSet<E> decorated = new TransformedNavigableSet<>(set, transformer); if (set.size() > 0) { @SuppressWarnings("unchecked") // set is type E final E[] values = (E[]) set.toArray(); // NOPMD - false positive for generics set.clear(); for (final E value : values) { decorated.decorated().add(transformer.transform(value)); } } return decorated; } //-----------------------------------------------------------------------
Constructor that wraps (not copies).

If there are any elements already in the set being decorated, they are NOT transformed.

Params:
  • set – the set to decorate, must not be null
  • transformer – the transformer to use for conversion, must not be null
Throws:
/** * Constructor that wraps (not copies). * <p> * If there are any elements already in the set being decorated, they * are NOT transformed. * * @param set the set to decorate, must not be null * @param transformer the transformer to use for conversion, must not be null * @throws NullPointerException if set or transformer is null */
protected TransformedNavigableSet(final NavigableSet<E> set, final Transformer<? super E, ? extends E> transformer) { super(set, transformer); }
Gets the decorated navigable set.
Returns:the decorated navigable set
/** * Gets the decorated navigable set. * * @return the decorated navigable set */
@Override protected NavigableSet<E> decorated() { return (NavigableSet<E>) super.decorated(); } //----------------------------------------------------------------------- @Override public E lower(final E e) { return decorated().lower(e); } @Override public E floor(final E e) { return decorated().floor(e); } @Override public E ceiling(final E e) { return decorated().ceiling(e); } @Override public E higher(final E e) { return decorated().higher(e); } @Override public E pollFirst() { return decorated().pollFirst(); } @Override public E pollLast() { return decorated().pollLast(); } @Override public NavigableSet<E> descendingSet() { return transformingNavigableSet(decorated().descendingSet(), transformer); } @Override public Iterator<E> descendingIterator() { return decorated().descendingIterator(); } @Override public NavigableSet<E> subSet(final E fromElement, final boolean fromInclusive, final E toElement, final boolean toInclusive) { final NavigableSet<E> sub = decorated().subSet(fromElement, fromInclusive, toElement, toInclusive); return transformingNavigableSet(sub, transformer); } @Override public NavigableSet<E> headSet(final E toElement, final boolean inclusive) { final NavigableSet<E> head = decorated().headSet(toElement, inclusive); return transformingNavigableSet(head, transformer); } @Override public NavigableSet<E> tailSet(final E fromElement, final boolean inclusive) { final NavigableSet<E> tail = decorated().tailSet(fromElement, inclusive); return transformingNavigableSet(tail, transformer); } }