jakarta.faces.event.ExceptionQueuedEventContext Maven / Gradle / Ivy
/*
* Copyright (c) 1997, 2020 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package jakarta.faces.event;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import jakarta.faces.component.UIComponent;
import jakarta.faces.context.FacesContext;
/**
*
* This helper class provides context to the {@link ExceptionQueuedEvent} regarding the state of the system at the point
* in time when the ExceptionQueuedEvent occurs and links the ExceptionQueuedEvent to the
* {@link jakarta.faces.context.ExceptionHandler} by virtue of implementing {@link SystemEventListener}.
*
*
* @since 2.0
*/
public class ExceptionQueuedEventContext implements SystemEventListenerHolder {
/**
*
* The presence of an entry under this key in the Map returned from {@link #getAttributes} indicates the
* event occurred during the “before phase” part of the current lifecycle phase.
*
*/
public static final String IN_BEFORE_PHASE_KEY = ExceptionQueuedEventContext.class.getName() + ".IN_BEFORE_PHASE";
/**
*
* The presence of an entry under this key in the Map returned from {@link #getAttributes} indicates the
* event occurred during the “after phase” part of the current lifecycle phase.
*
*/
public static final String IN_AFTER_PHASE_KEY = ExceptionQueuedEventContext.class.getName() + ".IN_AFTER_PHASE";
private FacesContext context;
private Throwable thrown;
private UIComponent component;
private PhaseId phaseId;
private Map attributes;
private List listener;
// ------------------------------------------------------------ Constructors
/**
*
* Instantiate a new ExceptionQueuedEventContext that indicates the argument Throwable just
* occurred.
*
*
* @param context {@link FacesContext} for the current request
* @param thrown the Throwable that is the context for this ExceptionQueuedEventContext
* instance.
*/
public ExceptionQueuedEventContext(FacesContext context, Throwable thrown) {
this(context, thrown, null, null);
}
/**
*
* Instantiate a new ExceptionQueuedEventContext that indicates the argument Throwable just
* occurred, relevant to the argument component.
*
* @param context {@link FacesContext} for the current request
* @param thrown the Throwable that is the context for this ExceptionQueuedEventContext
* instance.
* @param component the {@link UIComponent} instance to which this ExceptionQueuedEventContext pertains
*
*/
public ExceptionQueuedEventContext(FacesContext context, Throwable thrown, UIComponent component) {
this(context, thrown, component, null);
}
/**
*
* Instantiate a new ExceptionQueuedEventContext that indicates the argument Throwable just
* occurred, relevant to the argument component, during the lifecycle phase phaseId.
*
*
* @param context {@link FacesContext} for the current request
*
* @param thrown the Throwable that is the context for this ExceptionQueuedEventContext
* instance.
*
* @param component the UIComponent that is relevant to the context.
*
* @param phaseId the PhaseId at the time this ExeceptionEventContext is created.
*/
public ExceptionQueuedEventContext(FacesContext context, Throwable thrown, UIComponent component, PhaseId phaseId) {
this.context = context;
this.thrown = thrown;
this.component = component;
this.phaseId = phaseId == null ? context.getCurrentPhaseId() : phaseId;
}
// ---------------------------------------------------------- Public Methods
/**
*
* The {@link FacesContext} for this request.
*
*
* @return the {@link FacesContext} used to create this ExceptionQueuedEventContext instance.
*/
public FacesContext getContext() {
return context;
}
/**
*
* Return the exception property.
*
*
* @return the exception
*/
public Throwable getException() {
return thrown;
}
/**
*
* Return the UIComponent which was being processed when the exception was thrown. If none or not
* available, this will be null.
*
*
* @return the component
*/
public UIComponent getComponent() {
return component;
}
/**
*
* Return the PhaseId which was being processed when the exception was thrown. If none or not available,
* this will be null.
*
*
* @return the phase id
*/
public PhaseId getPhaseId() {
return phaseId;
}
/**
* @return true if the exception occurred during the before phase processing for a particular
* lifecycle phase
*/
public boolean inBeforePhase() {
return isAttributeDefined(IN_BEFORE_PHASE_KEY);
}
/**
* @return true if the exception occurred during the after phase processing for a particular
* lifecycle phase
*/
public boolean inAfterPhase() {
return isAttributeDefined(IN_AFTER_PHASE_KEY);
}
/**
*
* A Map of attributes relevant to the context of this ExceptionQueuedEvent.
*
*
* @return attributes related to this context
*/
public Map getAttributes() {
if (null == attributes) {
attributes = new HashMap<>();
}
return attributes;
}
/**
*
* Return a List that contains a single entry, the {@link jakarta.faces.context.ExceptionHandler} for the
* current request.
*
*/
@Override
public List getListenersForEventClass(Class facesEventClass) {
if (null == listener) {
List list = new ArrayList<>(1);
list.add(context.getExceptionHandler());
listener = Collections.unmodifiableList(list);
}
return listener;
}
// --------------------------------------------------------- Private Methods
private boolean isAttributeDefined(String key) {
return attributes != null && attributes.containsKey(key);
}
}