| /* |
| * Copyright (c) 2009, 2021 Oracle and/or its affiliates. All rights reserved. |
| * |
| * This program and the accompanying materials are made available under the |
| * terms of the Eclipse Public License v. 2.0 which is available at |
| * http://www.eclipse.org/legal/epl-2.0, |
| * or the Eclipse Distribution License v. 1.0 which is available at |
| * http://www.eclipse.org/org/documents/edl-v10.php. |
| * |
| * SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause |
| */ |
| |
| // Contributors: |
| // Oracle - initial API and implementation |
| // |
| package org.eclipse.persistence.jpa.jpql.tools.utility.iterable; |
| |
| import java.util.ListIterator; |
| import org.eclipse.persistence.jpa.jpql.tools.utility.iterator.SingleElementListIterator; |
| import org.eclipse.persistence.jpa.jpql.utility.iterable.ListIterable; |
| |
| /** |
| * A <code>SingleElementListIterable</code> returns a {@link ListIterator} |
| * that holds a single element |
| * and returns it with the first call to {@link ListIterator#next()}, at |
| * which point it will return <code>false</code> to any subsequent |
| * call to {@link ListIterator#hasNext()}. Likewise, it will return <code>false</code> |
| * to a call to {@link ListIterator#hasPrevious()} until a call to {@link ListIterator#next()}, |
| * at which point a call to {@link ListIterator#previous()} will return the |
| * single element. |
| * <p> |
| * A <code>SingleElementListIterable</code> is equivalent to the |
| * {@link Iterable} returned by: |
| * {@link java.util.Collections#singletonList(Object)}. |
| * |
| * @param <E> the type of elements returned by the list iterable's list iterator |
| * |
| * @see SingleElementListIterator |
| * @see <a href="http://git.eclipse.org/c/dali/webtools.dali.git/tree/common/plugins/org.eclipse.jpt.common.utility/src/org/eclipse/jpt/common/utility/internal/iterable/SingleElementListIterable.java">SingleElementListIterable</a> |
| */ |
| @SuppressWarnings("nls") |
| public class SingleElementListIterable<E> implements ListIterable<E> { |
| |
| private final E element; |
| |
| /** |
| * Construct a list iterable that contains only the specified element. |
| */ |
| public SingleElementListIterable(E element) { |
| super(); |
| this.element = element; |
| } |
| |
| @Override |
| public ListIterator<E> iterator() { |
| return new SingleElementListIterator<E>(this.element); |
| } |
| |
| @Override |
| public String toString() { |
| return "[" + this.element + "]"; |
| } |
| } |