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EE4J Compatible Implementation for Jakarta Faces API
/*
* Copyright (c) 1997, 2018 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 com.sun.faces.application.view;
import com.sun.faces.util.MessageUtils;
import java.util.EnumSet;
import java.util.List;
import java.util.Set;
import javax.faces.application.FacesMessage;
import javax.faces.component.ActionSource;
import javax.faces.component.ActionSource2;
import javax.faces.component.EditableValueHolder;
import javax.faces.component.UIComponent;
import javax.faces.component.UIForm;
import javax.faces.component.UIViewRoot;
import javax.faces.component.visit.VisitCallback;
import javax.faces.component.visit.VisitContext;
import javax.faces.component.visit.VisitHint;
import javax.faces.component.visit.VisitResult;
import javax.faces.context.FacesContext;
/**
* A convenience class that checks for omitted forms.
*/
class FormOmittedChecker {
/**
* Stores the skip hint.
*/
private static String SKIP_ITERATION_HINT = "javax.faces.visit.SKIP_ITERATION";
/**
* Constructor.
*/
private FormOmittedChecker() {
}
/**
* Check if omitted forms are present.
*
* @param context the Faces context.
*/
public static void check(FacesContext context) {
final FacesContext finalContext = context;
UIViewRoot viewRoot = context.getViewRoot();
List children = viewRoot.getChildren();
for (UIComponent child : children) {
try {
context.getAttributes().put(SKIP_ITERATION_HINT, true);
Set hints = EnumSet.of(VisitHint.SKIP_ITERATION);
VisitContext visitContext = VisitContext.createVisitContext(context, null, hints);
child.visitTree(visitContext, new VisitCallback() {
@Override
public VisitResult visit(VisitContext visitContext, UIComponent component) {
VisitResult result = VisitResult.ACCEPT;
if (isForm(component)) {
result = VisitResult.REJECT;
} else if (isInNeedOfForm(component)) {
addFormOmittedMessage(finalContext, component);
}
return result;
}
});
} finally {
context.getAttributes().remove(SKIP_ITERATION_HINT);
}
}
}
/**
* Is the component a form.
*
* Note normally a form inherits from UIForm, but there might be some
* component libraries out there that might not honor that. So we check the
* component family to avoid warning in cases where 3rd party form component
* that does not extend UIForm (eg. tr:form) is used.
*
* @param component the UI component.
* @return true if it is a form, false otherwise.
*/
private static boolean isForm(UIComponent component) {
return (component instanceof UIForm || (component.getFamily() != null && component.getFamily().endsWith("Form")));
}
/**
* Is the component in need of a form.
*
* @param component the UI component.
* @return true if the component is in need of a form, false otherwise.
*/
private static boolean isInNeedOfForm(UIComponent component) {
return (component instanceof ActionSource
|| component instanceof ActionSource2
|| component instanceof EditableValueHolder);
}
/**
* Add the form omitted message.
*
* @param context the Faces context.
* @param component the UI component.
*/
private static void addFormOmittedMessage(FacesContext context, UIComponent component) {
String key = MessageUtils.MISSING_FORM_ERROR;
Object[] parameters = new Object[]{component.getClientId(context)};
boolean missingFormReported = false;
FacesMessage message = MessageUtils.getExceptionMessage(key, parameters);
List messages = context.getMessageList();
for (FacesMessage item : messages) {
if (item.getDetail().equals(message.getDetail())) {
missingFormReported = true;
break;
}
}
if (!missingFormReported) {
message.setSeverity(FacesMessage.SEVERITY_WARN);
context.addMessage(null, message);
}
}
}