| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| * |
| */ |
| package org.apache.directory.api.ldap.model.cursor; |
| |
| |
| import java.util.Iterator; |
| |
| import org.apache.directory.api.i18n.I18n; |
| |
| |
| /** |
| * An Iterator over a Cursor so Cursors can be Iterable for using in foreach |
| * constructs. |
| * |
| * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> |
| * @param <E> The type of element on which this cursor will iterate |
| */ |
| public class CursorIterator<E> implements Iterator<E> |
| { |
| /** The inner cursor we will iterate */ |
| private final Cursor<E> cursor; |
| |
| /** A flag used to store the cursor state */ |
| private boolean available; |
| |
| |
| /** |
| * Creates a new instance of CursorIterator. |
| * |
| * @param cursor The inner cursor |
| */ |
| public CursorIterator( Cursor<E> cursor ) |
| { |
| this.cursor = cursor; |
| |
| try |
| { |
| this.available = cursor.next(); |
| } |
| catch ( Exception e ) |
| { |
| this.available = false; |
| } |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public boolean hasNext() |
| { |
| return available; |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public E next() |
| { |
| try |
| { |
| E element = cursor.get(); |
| available = cursor.next(); |
| |
| return element; |
| } |
| catch ( Exception e ) |
| { |
| throw new RuntimeException( I18n.err( I18n.ERR_13100_FAILURE_ON_UNDERLYING_CURSOR ), e ); |
| } |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public void remove() |
| { |
| throw new UnsupportedOperationException( I18n.err( I18n.ERR_13103_REMOVAL_NOT_SUPPORTED ) ); |
| } |
| } |