org.apache.myfaces.shared_tomahawk.util.RestoreStateUtils Maven / Gradle / Ivy
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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.myfaces.shared_tomahawk.util;
import java.lang.reflect.Method;
import java.util.Iterator;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.el.ValueExpression;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
/**
* @author Martin Marinschek (latest modification by $Author: bommel $)
* @version $Revision: 1187700 $ $Date: 2011-10-22 07:19:37 -0500 (Sat, 22 Oct 2011) $
*/
public class RestoreStateUtils
{
//private static Log log = LogFactory.getLog(RestoreStateUtils.class);
private static Logger log = Logger.getLogger(RestoreStateUtils.class.getName());
/**
* Walk the component tree, executing any component-bindings to reattach
* components to their backing beans.
*
* Note that this method effectively breaks encapsulation; instead of
* asking each component to update itself and its children, this
* method just reaches into each component. That makes it impossible
* for any component to customise its behaviour at this point.
*
* This has been filed as an issue against the spec. Until this
* issue is resolved, we'll add a new marker-interface for components
* to allow them to define their interest in handling children bindings themselves.
*/
public static void recursivelyHandleComponentReferencesAndSetValid(FacesContext facesContext,
UIComponent parent)
{
recursivelyHandleComponentReferencesAndSetValid(facesContext, parent, false);
}
public static void recursivelyHandleComponentReferencesAndSetValid(FacesContext facesContext,
UIComponent parent, boolean forceHandle)
{
Method handleBindingsMethod = getBindingMethod(parent);
if(handleBindingsMethod!=null && !forceHandle)
{
try
{
handleBindingsMethod.invoke(parent,new Object[]{});
}
catch (Throwable th)
{
log.log(Level.SEVERE, "Exception while invoking handleBindings on component with client-id:"
+parent.getClientId(facesContext),th);
}
}
else
{
for (Iterator it = parent.getFacetsAndChildren(); it.hasNext(); )
{
UIComponent component = (UIComponent)it.next();
ValueExpression binding = component.getValueExpression("binding"); //TODO: constant
if (binding != null)
{
binding.setValue(facesContext.getELContext(), component);
}
//This part is not necessary on JSF 1.2
//if (component instanceof UIInput)
//{
// ((UIInput)component).setValid(true);
//}
recursivelyHandleComponentReferencesAndSetValid(facesContext, component);
}
}
}
/**This is all a hack to work around a spec-bug which will be fixed in JSF2.0
*
* @param parent
* @return true if this component is bindingAware (e.g. aliasBean)
*/
private static Method getBindingMethod(UIComponent parent)
{
Class[] clazzes = parent.getClass().getInterfaces();
for (int i = 0; i < clazzes.length; i++)
{
Class clazz = clazzes[i];
if(clazz.getName().indexOf("BindingAware")!=-1)
{
try
{
return parent.getClass().getMethod("handleBindings",new Class[]{});
}
catch (NoSuchMethodException e)
{
// return
}
}
}
return null;
}
}