tapestry-framework/src/org/apache/tapestry/html/ExceptionDisplay.java

//  Copyright 2004 The Apache Software Foundation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package org.apache.tapestry.html;

import org.apache.tapestry.BaseComponent;
import org.apache.tapestry.IBinding;
import org.apache.tapestry.IMarkupWriter;
import org.apache.tapestry.IRequestCycle;
import org.apache.tapestry.bean.EvenOdd;
import org.apache.tapestry.util.exception.ExceptionDescription;

/**
 *  Component used to display an already formatted exception.
 * 
 *  [<a href="../../../../../ComponentReference/ExceptionDisplay.html">Component Reference</a>]
 *
 *  @author Howard Lewis Ship
 *  @version $Id$
 * 
 **/

public class ExceptionDisplay extends BaseComponent
{
    private IBinding _exceptionsBinding;
    private ExceptionDescription _exception;
    private int _count;
    private int _index;
    private EvenOdd _evenOdd;

    public void setExceptionsBinding(IBinding value)
    {
        _exceptionsBinding = value;
    }

    public IBinding getExceptionsBinding()
    {
        return _exceptionsBinding;
    }

    /**
     *  Each time the current exception is set, as a side effect,
     *  the evenOdd helper bean is reset to even.
     * 
     **/
    
    public void setException(ExceptionDescription value)
    {
        _exception = value;
        
        _evenOdd.setEven(true);
    }

    public ExceptionDescription getException()
    {
        return _exception;
    }

    protected void renderComponent(IMarkupWriter writer, IRequestCycle cycle)
    {
        ExceptionDescription[] exceptions =
            (ExceptionDescription[]) _exceptionsBinding.getObject(
                "exceptions",
                ExceptionDescription[].class);

        _count = exceptions.length;
        
        try
        {
            _evenOdd = (EvenOdd)getBeans().getBean("evenOdd");
            
            super.renderComponent(writer, cycle);
        }
        finally
        {
            _exception = null;
            _evenOdd = null;
        }
    }

    public void setIndex(int value)
    {
        _index = value;
    }

    public boolean isLast()
    {
        return _index == (_count - 1);
    }
}