/*   Copyright 2004 BEA Systems, Inc.
 *
 *   Licensed 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 com.bea.xml.stream.util;

import java.util.Iterator;
import java.util.NoSuchElementException;

public final class ArrayIterator implements Iterator {

  private final Object[] array;
  private final int maxIndex;
  private int index;

  public ArrayIterator(Object[] a) {
    this(a, 0, a.length);
  }

  public ArrayIterator(Object[] a, int off, int len) {
    if (off < 0) throw new IllegalArgumentException();
    if (off > a.length) throw new IllegalArgumentException();
    if (len > a.length - off) throw new IllegalArgumentException();
    array = a;
    index = off;
    maxIndex = len + off;
  }

  public boolean hasNext() { return index < maxIndex; }

  public Object next() {
    if (index >= maxIndex) throw new NoSuchElementException();
    return array[index++];
  }

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

}