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    1   /*
    2    * $Id: IteratorFilterSupport.java 471756 2006-11-06 15:01:43Z 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.struts2.util;
    22
    23  import java.util.Enumeration;
    24  import java.util.Iterator;
    25
    26
    27  /***
    28   * A base class for iterator filters
    29   *
    30   */
    31  public abstract class IteratorFilterSupport {
    32
    33      // Protected implementation --------------------------------------
    34      protected Object getIterator(Object source) {
    35          return MakeIterator.convert(source);
    36      }
    37
    38
    39      // Wrapper for enumerations
    40      public class EnumerationIterator implements Iterator {
    41          Enumeration enumeration;
    42
    43          public EnumerationIterator(Enumeration aEnum) {
    44              enumeration = aEnum;
    45          }
    46
    47          public boolean hasNext() {
    48              return enumeration.hasMoreElements();
    49          }
    50
    51          public Object next() {
    52              return enumeration.nextElement();
    53          }
    54
    55          public void remove() {
    56              throw new UnsupportedOperationException("Remove is not supported in IteratorFilterSupport.");
    57          }
    58      }
    59  }