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    
015    package org.apache.tapestry.html;
016    
017    import org.apache.tapestry.BaseComponent;
018    import org.apache.tapestry.IMarkupWriter;
019    import org.apache.tapestry.IRequestCycle;
020    import org.apache.tapestry.bean.EvenOdd;
021    import 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    
030    public 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    }