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
026     * Reference </a>]
027     * 
028     * @author Howard Lewis Ship
029     */
030    
031    public abstract class ExceptionDisplay extends BaseComponent
032    {
033        private ExceptionDescription _exception;
034    
035        private EvenOdd _evenOdd;
036    
037        public abstract int getIndex();
038    
039        public abstract int getCount();
040    
041        public abstract void setCount(int count);
042    
043        public abstract ExceptionDescription[] getExceptions();
044        
045        /**
046         * Each time the current exception is set, as a side effect, the evenOdd
047         * helper bean is reset to even.
048         */
049    
050        public void setException(ExceptionDescription value)
051        {
052            _exception = value;
053    
054            _evenOdd.setEven(true);
055        }
056    
057        public ExceptionDescription getException()
058        {
059            return _exception;
060        }
061    
062        protected void renderComponent(IMarkupWriter writer, IRequestCycle cycle)
063        {
064            ExceptionDescription[] exceptions = getExceptions();
065    
066            setCount(exceptions.length);
067    
068            try
069            {
070                _evenOdd = (EvenOdd) getBeans().getBean("evenOdd");
071    
072                super.renderComponent(writer, cycle);
073            }
074            finally
075            {
076                _exception = null;
077                _evenOdd = null;
078            }
079        }
080    
081        public boolean isLast()
082        {
083            return getIndex() == (getCount() - 1);
084        }
085    }