IteratorAdapter xref

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    1   /*
    2    * $Id: IteratorAdapter.java 471754 2006-11-06 14:55:09Z husted $
    3    *
    4    * Licensed to the Apache Software Foundation (ASF) under one
    5    * or more contributor license agreements.  See the NOTICE file
    6    * distributed with this work for additional information
    7    * regarding copyright ownership.  The ASF licenses this file
    8    * to you under the Apache License, Version 2.0 (the
    9    * "License"); you may not use this file except in compliance
    10   * with the License.  You may obtain a copy of the License at
    11   *
    12   *  http://www.apache.org/licenses/LICENSE-2.0
    13   *
    14   * Unless required by applicable law or agreed to in writing,
    15   * software distributed under the License is distributed on an
    16   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    17   * KIND, either express or implied.  See the License for the
    18   * specific language governing permissions and limitations
    19   * under the License.
    20   */
    21  package org.apache.struts.util;
    22
    23  import java.util.Enumeration;
    24  import java.util.Iterator;
    25  import java.util.NoSuchElementException;
    26
    27  /**
    28   * Utility method for converting Enumeration to an Iterator class.  If you
    29   * attempt to remove() an Object from the iterator, it will throw an
    30   * UnsupportedOperationException. Added for use by TagLib so Enumeration can
    31   * be supported
    32   *
    33   * @version $Rev: 471754 $ $Date: 2005-05-07 12:11:38 -0400 (Sat, 07 May 2005)
    34   *          $
    35   */
    36  public class IteratorAdapter implements Iterator {
    37      private Enumeration e;
    38
    39      public IteratorAdapter(Enumeration e) {
    40          this.e = e;
    41      }
    42
    43      public boolean hasNext() {
    44          return e.hasMoreElements();
    45      }
    46
    47      public Object next() {
    48          if (!e.hasMoreElements()) {
    49              throw new NoSuchElementException(
    50                  "IteratorAdaptor.next() has no more elements");
    51          }
    52
    53          return e.nextElement();
    54      }
    55
    56      public void remove() {
    57          throw new UnsupportedOperationException(
    58              "Method IteratorAdaptor.remove() not implemented");
    59      }
    60  }