001// Copyright 2004, 2005 The Apache Software Foundation
002//
003// Licensed under the Apache License, Version 2.0 (the "License");
004// you may not use this file except in compliance with the License.
005// You may obtain a copy of the License at
006//
007//     http://www.apache.org/licenses/LICENSE-2.0
008//
009// Unless required by applicable law or agreed to in writing, software
010// distributed under the License is distributed on an "AS IS" BASIS,
011// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012// See the License for the specific language governing permissions and
013// limitations under the License.
014
015package org.apache.tapestry.bean;
016
017/**
018 *  Used to emit a stream of alterating string values: "even", "odd", etc.  This
019 *  is often used in the Inspector pages to make the class of a <tr> alternate
020 *  for presentation reasons.
021 *
022 *  @author Howard Lewis Ship
023 *
024 **/
025
026public class EvenOdd
027{
028    private boolean even = true;
029
030    /**
031     *  Returns "even" or "odd".  Whatever it returns on one invocation, it will
032     *  return the opposite on the next.  By default, the first value
033     *  returned is "even".
034     *
035     **/
036
037    public String getNext()
038    {
039        String result = even ? "even" : "odd";
040
041        even = !even;
042
043        return result;
044    }
045    
046    public boolean isEven()
047    {
048        return even;
049    }
050
051        /**
052         *  Overrides the even flag.
053         * 
054         **/
055        
056    public void setEven(boolean value)
057    {
058        even = value;
059    }
060}