maven-faces-plugin/src/main/java/org/apache/myfaces/trinidadbuild/plugin/faces/util/SortedIterator.java

/*
 * 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.myfaces.trinidadbuild.plugin.faces.util;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;

/**
 * SortedIterator presents the elements of another iterator in a sorted order.
 */
public class SortedIterator<T extends Comparable<? super T>> implements Iterator<T>
{
  public SortedIterator(
    Iterator<T> unsorted)
  {
     // this implementation just pulls the entire contents into a list --
     // it will be awkward if the unsorted iterator is infinite
     List<T> sortedList = new ArrayList<T>();
     while(unsorted.hasNext())
     {
       sortedList.add(unsorted.next());
     }
     Collections.sort(sortedList);
     _sorted = sortedList.iterator();
  }

  @Override
  public boolean hasNext()
  {
    return _sorted.hasNext();
  }

  @Override
  public T next()
  {
    return _sorted.next();
  }

  @Override
  public void remove()
  {
    throw new UnsupportedOperationException();
  }

  private final Iterator<T> _sorted;
}