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.html;
016
017import org.apache.tapestry.BaseComponent;
018import org.apache.tapestry.IMarkupWriter;
019import org.apache.tapestry.IRequestCycle;
020import org.apache.tapestry.bean.EvenOdd;
021import org.apache.tapestry.util.exception.ExceptionDescription;
022
023/**
024 * Component used to display an already formatted exception. [ <a
025 * href="../../../../../ComponentReference/ExceptionDisplay.html">Component Reference </a>]
026 * 
027 * @author Howard Lewis Ship
028 */
029
030public abstract class ExceptionDisplay extends BaseComponent
031{
032    public abstract ExceptionDescription[] getExceptions();
033
034    private ExceptionDescription _exception;
035
036    private EvenOdd _evenOdd;
037
038    public abstract int getIndex();
039
040    public abstract int getCount();
041
042    public abstract void setCount(int count);
043
044    /**
045     * Each time the current exception is set, as a side effect, the evenOdd helper bean is reset to
046     * even.
047     */
048
049    public void setException(ExceptionDescription value)
050    {
051        _exception = value;
052
053        _evenOdd.setEven(true);
054    }
055
056    public ExceptionDescription getException()
057    {
058        return _exception;
059    }
060
061    protected void renderComponent(IMarkupWriter writer, IRequestCycle cycle)
062    {
063        ExceptionDescription[] exceptions = getExceptions();
064
065        setCount(exceptions.length);
066
067        try
068        {
069            _evenOdd = (EvenOdd) getBeans().getBean("evenOdd");
070
071            super.renderComponent(writer, cycle);
072        }
073        finally
074        {
075            _exception = null;
076            _evenOdd = null;
077        }
078    }
079
080    public boolean isLast()
081    {
082        return getIndex() == (getCount() - 1);
083    }
084}