1 /* 2 * ModeShape (http://www.modeshape.org) 3 * See the COPYRIGHT.txt file distributed with this work for information 4 * regarding copyright ownership. Some portions may be licensed 5 * to Red Hat, Inc. under one or more contributor license agreements. 6 * See the AUTHORS.txt file in the distribution for a full listing of 7 * individual contributors. 8 * 9 * Unless otherwise indicated, all code in ModeShape is licensed 10 * to you under the terms of the GNU Lesser General Public License as 11 * published by the Free Software Foundation; either version 2.1 of 12 * the License, or (at your option) any later version. 13 * 14 * ModeShape is distributed in the hope that it will be useful, 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 17 * Lesser General Public License for more details. 18 * 19 * You should have received a copy of the GNU Lesser General Public 20 * License along with this software; if not, write to the Free 21 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 22 * 02110-1301 USA, or see the FSF site: http://www.fsf.org. 23 */ 24 package org.modeshape.common.collection; 25 26 import java.util.Iterator; 27 28 /** 29 * An {@link Iterator} implementation that only allows reading elements, used as a wrapper around another iterator to make the 30 * contents immutable to the user of this iterator. 31 * 32 * @param <T> the type of the elements over which the iteration is being performed 33 */ 34 public final class ReadOnlyIterator<T> implements Iterator<T> { 35 36 private final Iterator<T> delegate; 37 38 public ReadOnlyIterator( Iterator<T> delegate ) { 39 this.delegate = delegate; 40 assert this.delegate != null; 41 } 42 43 /** 44 * {@inheritDoc} 45 * 46 * @see java.util.Iterator#hasNext() 47 */ 48 public boolean hasNext() { 49 return delegate.hasNext(); 50 } 51 52 /** 53 * {@inheritDoc} 54 * 55 * @see java.util.Iterator#next() 56 */ 57 public T next() { 58 return delegate.next(); 59 } 60 61 /** 62 * {@inheritDoc} 63 * 64 * @see java.util.Iterator#remove() 65 */ 66 public void remove() { 67 throw new UnsupportedOperationException(); 68 } 69 70 }