arrayenumeration.java

报表设计软件,很好的

/*
 * Copyright (c) 1998, 1999 by Free Software Foundation, Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Library General Public License as published
 * by the Free Software Foundation, version 2. (see COPYING.LIB)
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation
 * Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307 USA
 */

package org.jfree.designer.visualeditor.treemodel;

import java.util.Enumeration;

/**
 * An enumeration over an array of objects.
 */
public final class ArrayEnumeration
        implements Enumeration
{
  public static final ArrayEnumeration EMPTY_ENUMERATION =
          new ArrayEnumeration(new Object[0]);

  private Object[] objectarray = null;
  private int counter = 0;

  public ArrayEnumeration (final Object[] objectarray)
  {
    if (objectarray == null)
    {
      throw new NullPointerException("ObjektArray must not be null");
    }

    this.objectarray = objectarray;
  }

  /**
   * Returns true if this enumeration has at least one more Element.
   */
  public final boolean hasMoreElements ()
  {
    return (counter < objectarray.length);
  }

  /**
   * Returns the next element in the Array.
   */
  public final Object nextElement ()
  {
    final Object retval = objectarray[counter];
    counter += 1;
    return retval;
  }
}