WrappedIterator.java

/**
 *
    Java Diagram Package; An extremely flexible and fast multipurpose diagram 
    component for Swing.
    Copyright (C) 2001  Eric Crahen <crahen@cse.buffalo.edu>

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    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 util;

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

/**
 * @class WrappedIterator
 *
 * @date 08-20-2001
 * @author Eric Crahen
 * @version 1.0
 */
public class WrappedIterator implements Iterator {

  private Iterator iter;
  private boolean readOnly;

  public WrappedIterator(Iterator iter) {
    this(iter, false);
  }

  public WrappedIterator(Iterator iter, boolean readOnly) {
    setIterator(iter);
    setReadOnly(readOnly);
  }

  public boolean hasNext() {
    return iter != null && iter.hasNext();
  }

  public Object next() {

    if(iter != null)
      return iter.next();

    throw new NoSuchElementException();

  }

  public void remove() {

    if(!readOnly && iter != null)
      iter.remove();

  }

  protected void setReadOnly(boolean readOnly) {
    this.readOnly = readOnly;
  }

  protected boolean isReadOnly() {
    return readOnly;
  }

  protected Iterator getIterator() {
    return iter;
  }

  protected void setIterator(Iterator iter) {
    this.iter = iter;
  }

}