BeanActionButton.java

/*---
   Copyright 2006-2007 Visual Systems Corporation.
   http://www.vscorp.com

   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 com.googlecode.wicketwebbeans.actions;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;


import org.apache.wicket.ajax.AjaxRequestTarget;
import org.apache.wicket.markup.html.form.Form;
import org.apache.wicket.model.IModel;
import org.apache.wicket.Component;

import com.googlecode.wicketwebbeans.model.ElementMetaData;

/**
 * Bean button for Actions. Action config properties:<p>
 * <ul>
 *  <li>confirm=msg - delivers a confirmation message when clicked. If answer is "Yes", the action proceeds,
 *    otherwise it is canceled.</li>
 *  <li>ajax - true/false where the action should be invoked with Ajax. Otherwise, it is a regular
 *    form submit.</li>
 *  <li>default - true/false whether the button should be fired when the Enter key is pressed anywhere
 *    on the form.</li>
 * </ul>     
 * <p>
 * 
 * @author Dan Syrstad
 * @author Mark Southern (mrsouthern) - fix bug 1808364.
 */
public class BeanActionButton extends BeanSubmitButton
{
    private static final long serialVersionUID = 1212662032661731174L;

    private static final Class[] GENERIC_ACTION_PARAMS = new Class[] { AjaxRequestTarget.class, Form.class, Object.class };
    
    private ElementMetaData element;
    
    /**
     * Construct a BeanActionButton. 
     *
     * @param id
     * @param element 
     * @param form
     * @param bean may be a direct bean or an IModel.
     */
    public BeanActionButton(String id, ElementMetaData element, Form form, Object bean)
    {
        super(id, element, form, bean);
        this.element = element;
    }

    @Override
    protected void onAction(AjaxRequestTarget target, Form form, Object bean)
    {
        if (bean instanceof IModel) {
            bean = ((IModel)bean).getObject();
        }
        
        Component component = element.getBeanMetaData().getComponent();
        String methodName = element.getActionMethodName();
        
        try {
            // Try first to find a bean-specific method.
            Method method;
            try {
                method = component.getClass().getMethod(methodName, new Class[] { AjaxRequestTarget.class, Form.class, bean.getClass() } );
            }
            catch (Exception e) {
                // Ignore and try generic parameters.
                method = component.getClass().getMethod(methodName, GENERIC_ACTION_PARAMS);
            }
            
            method.invoke(component, new Object[] { target, form, bean });
        }
        catch (NoSuchMethodException e) {
            throw new RuntimeException("Action method " + methodName + "(AjaxRequestTarget, Form, " + bean.getClass().getName() + "/Object) is not defined in " + component.getClass());
        }
        catch (IllegalAccessException e) {
            throw new RuntimeException("Action method " + methodName + " defined in " + component.getClass() + " must be declared public");
        }
        catch (InvocationTargetException e) {
            throw new RuntimeException("Error invoking action " + methodName + " defined in " + component.getClass(), e.getCause());
        }
    }
}