1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one 3 * or more contributor license agreements. See the NOTICE file 4 * distributed with this work for additional information 5 * regarding copyright ownership. The ASF licenses this file 6 * to you under the Apache License, Version 2.0 (the 7 * "License"); you may not use this file except in compliance 8 * with the License. You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, 13 * software distributed under the License is distributed on an 14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 15 * KIND, either express or implied. See the License for the 16 * specific language governing permissions and limitations 17 * under the License. 18 * 19 */ 20 package org.apache.directory.server.core.cursor; 21 22 23 import java.util.Iterator; 24 25 26 /** 27 * An Iterator over a Cursor so Cursors can be Iterable for using in foreach 28 * constructs. 29 * 30 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> 31 * @version $$Rev$$ 32 */ 33 public class CursorIterator<E> implements Iterator<E> 34 { 35 private final Cursor<E> cursor; 36 private boolean available; 37 38 39 public CursorIterator( Cursor<E> cursor ) 40 { 41 this.cursor = cursor; 42 this.available = cursor.available(); 43 } 44 45 46 public boolean hasNext() 47 { 48 return available; 49 } 50 51 52 public E next() 53 { 54 try 55 { 56 E element = cursor.get(); 57 available = cursor.next(); 58 return element; 59 } 60 catch ( Exception e ) 61 { 62 throw new RuntimeException( "Failure on underlying Cursor.", e ); 63 } 64 } 65 66 67 public void remove() 68 { 69 throw new UnsupportedOperationException( "Underlying Cursor does not support removal." ); 70 } 71 }