chalk.tools.util.ReverseListIterator Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of chalk Show documentation

chalk

There is a newer version: 1.3.0

/*
 * 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 chalk.tools.util;

import java.util.Iterator;
import java.util.List;

/**
 * An iterator for a list which returns values in the opposite order as the typical list iterator.
 */
public class ReverseListIterator implements Iterator {

  private int index;
  private List list;

  public ReverseListIterator(List list) {
    index = list.size()-1;
    this.list=list;
  }

  public T next() {
    return list.get(index--);
  }

  public boolean hasNext() {
    return index >=0;
  }

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