/*
* 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.shale.view.faces;
import javax.faces.component.UIViewRoot;
import javax.faces.context.FacesContext;
import org.apache.shale.view.Constants;
import org.apache.shale.view.ExceptionHandler;
/**
* <p>Extending the UIViewRoot to provide specialized exception
* handling needed for the Shale view controller to enforce the contracts
* of the callbacks.</p>
*/
public class ShaleViewRoot extends UIViewRoot {
/**
* <p>Override to catch exceptions raised by the action listeners
* in the invoke application phase.</p>
*
* @param context faces context
*/
public void processApplication(FacesContext context) {
try {
super.processApplication(context);
} catch (Exception e) {
handleException(context, e);
context.responseComplete();
}
}
/**
* <p>Override to catch and handle exceptions with immediate commands
* and value change listeners in the apply request values phase.</p>
*
* @param context faces context
*/
public void processDecodes(FacesContext context) {
try {
super.processDecodes(context);
} catch (Exception e) {
handleException(context, e);
context.responseComplete();
}
}
/**
* <p>Override to catch and handle exceptions raised in the
* update model phase.</p>
*
* @param context faces context
*/
public void processUpdates(FacesContext context) {
try {
super.processUpdates(context);
} catch (Exception e) {
handleException(context, e);
context.responseComplete();
}
}
/**
* <p>Override to catch and handle exceptions in value change
* listeners that might have occured in the process validations
* phase.</p>
*
* @param context faces context
*/
public void processValidators(FacesContext context) {
try {
super.processValidators(context);
} catch (Exception e) {
handleException(context, e);
context.responseComplete();
}
}
/**
* <p>Handle the specified exception according to the strategy
* defined by our current {@link ExceptionHandler}.</p>
*
* @param context FacesContext for the current request
* @param exception Exception to be handled
*/
private void handleException(FacesContext context, Exception exception) {
if (context == null) {
exception.printStackTrace(System.out);
return;
}
ExceptionHandler handler = (ExceptionHandler)
context.getApplication().getVariableResolver().resolveVariable
(context, Constants.EXCEPTION_HANDLER);
handler.handleException(exception);
}
}