| /******************************************************************************* |
| * Copyright (c) 2009, 2015 Oracle. All rights reserved. |
| * This program and the accompanying materials are made available under the |
| * terms of the Eclipse Public License 2.0, which accompanies this distribution |
| * and is available at https://www.eclipse.org/legal/epl-2.0/. |
| * |
| * Contributors: |
| * Oracle - initial API and implementation |
| ******************************************************************************/ |
| package org.eclipse.jpt.common.utility.internal.iterable; |
| |
| import java.util.Iterator; |
| import org.eclipse.jpt.common.utility.internal.collection.ListTools; |
| import org.eclipse.jpt.common.utility.internal.iterator.FilteringIterator; |
| import org.eclipse.jpt.common.utility.internal.iterator.IteratorTools; |
| import org.eclipse.jpt.common.utility.predicate.Predicate; |
| |
| /** |
| * A <code>FilteringIterable</code> wraps another {@link Iterable} |
| * and uses a {@link Predicate} to determine which elements in the |
| * nested iterable are to be returned by the iterable's iterator. |
| * |
| * @param <E> the type of elements to be filtered |
| * |
| * @see FilteringIterator |
| */ |
| public class FilteringIterable<E> |
| implements Iterable<E> |
| { |
| private final Iterable<? extends E> iterable; |
| private final Predicate<? super E> predicate; |
| |
| |
| /** |
| * Construct an iterable with the specified nested |
| * iterable and filter. |
| */ |
| public FilteringIterable(Iterable<? extends E> iterable, Predicate<? super E> predicate) { |
| super(); |
| if ((iterable == null) || (predicate == null)) { |
| throw new NullPointerException(); |
| } |
| this.iterable = iterable; |
| this.predicate = predicate; |
| } |
| |
| public Iterator<E> iterator() { |
| return IteratorTools.filter(this.iterable.iterator(), this.predicate); |
| } |
| |
| @Override |
| public String toString() { |
| return ListTools.arrayList(this).toString(); |
| } |
| } |