// @(#)$Id: byteNonNegativeIteratorDecorator.java-generic,v 1.4 2005/12/06 19:54:59 chalin Exp $

// Copyright (C) 2005 Iowa State University
//
// This file is part of the runtime library of the Java Modeling Language.
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public License
// as published by the Free Software Foundation; either version 2.1,
// of the License, or (at your option) any later version.
//
// This library 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
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with JML; see the file LesserGPL.txt.  If not, write to the Free
// Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
// 02110-1301  USA.

package org.jmlspecs.jmlunit.strategies;

import java.util.NoSuchElementException;

/** An indefinite iterator that filters out negative test data.
 * @author Gary T. Leavens
 */
// FIXME: adapt this file to non-null-by-default and remove the following modifier.
/*@ nullable_by_default @*/ 
public class ByteNonNegativeIteratorDecorator
    extends ByteAbstractFilteringIteratorDecorator
{
    /*@ public normal_behavior
      @   requires iter != null;
      @   assignable rawElems, objectState;
      @   ensures (* rawElems is a clone of iter *);
      @*/
    public ByteNonNegativeIteratorDecorator(ByteIterator iter) {
        super(iter);
    }

    /** Return true just when the argument is not negative. */
    /*@ also
      @   public normal_behavior
      @     assignable \nothing;
      @     ensures \result <==> !(elem < 0);
      @*/
    public /*@ pure @*/ boolean approve(byte elem) {
        return !(elem < 0);
    }
}