com.sun.faces.config.Verifier Maven / Gradle / Ivy
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/*
* 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.config;
import java.lang.reflect.Constructor;
import java.lang.reflect.Modifier;
import java.util.ArrayList;
import java.util.List;
import com.sun.faces.RIConstants;
import com.sun.faces.util.MessageUtils;
import com.sun.faces.util.Util;
/**
*
* This class backs the com.sun.faces.verifyObjects feature which provides basic validation of Components,
* Converters, and Validators.
*
*/
public class Verifier {
/**
* Thread local to share the Verifier.
*/
private static final ThreadLocal VERIFIER = new ThreadLocal<>();
/**
* Represent the current Faces object types we validate.
*/
public enum ObjectType {
COMPONENT, CONVERTER, VALIDATOR, BEHAVIOR,
}
/**
* Container for any messages that may be queued.
*/
private List messages;
// ------------------------------------------------------- Constructors
/**
* Construct a new Verifier instance.
*/
Verifier() {
messages = new ArrayList<>(4);
}
// ------------------------------------------------- Public Methods
/**
* @return a Verifier for the current web application if com.sun.faces.verifyObjects
* is enabled
*/
public static Verifier getCurrentInstance() {
return VERIFIER.get();
}
/**
* Set the Verifier for this thread (typically the same thread that is used to bootstrap the application).
*
* @param verifier
* the Verifier for this web application
*/
public static void setCurrentInstance(Verifier verifier) {
if (verifier == null) {
VERIFIER.remove();
} else {
VERIFIER.set(verifier);
}
}
/**
* @return true if no messages were queued by the validation process
*/
public boolean isApplicationValid() {
return messages.isEmpty();
}
/**
* @return a List of all failures found
*/
public List getMessages() {
return messages;
}
/**
* Validate the specified faces object by:
*
* - Ensure the class can be found and loaded
* - Ensure the object has a public, no-argument constructor
Ensure the object is an instance of the class
* represented by assignableTo
*
* If any of these tests fail, queue a message to be displayed at a later point in time.
*
* @param type
* The type of Faces object we're validating
* @param className
* the class name of the Faces object we're validating
* @param assignableTo
* the type we expect className to either implement or extend
*/
public void validateObject(ObjectType type, String className, Class assignableTo) {
// temporary hack until we can fix the stylesheets that create
// the runtime xml
if ("javax.faces.component.html.HtmlHead".equals(className) || "javax.faces.component.html.HtmlBody".equals(className)) {
return;
}
Class c = null;
try {
c = Util.loadClass(className, this);
} catch (ClassNotFoundException cnfe) {
messages.add(MessageUtils.getExceptionMessageString(MessageUtils.VERIFIER_CLASS_NOT_FOUND_ID, type, className));
} catch (NoClassDefFoundError ncdfe) {
messages.add(MessageUtils.getExceptionMessageString(MessageUtils.VERIFIER_CLASS_MISSING_DEP_ID, type, className,
ncdfe.getMessage()));
}
if (c != null) {
try {
Constructor ctor = c.getConstructor(RIConstants.EMPTY_CLASS_ARGS);
if (!Modifier.isPublic(ctor.getModifiers())) {
messages.add(MessageUtils.getExceptionMessageString(MessageUtils.VERIFIER_CTOR_NOT_PUBLIC_ID, type, className));
}
} catch (NoSuchMethodException nsme) {
messages.add(MessageUtils.getExceptionMessageString(MessageUtils.VERIFIER_NO_DEF_CTOR_ID, type, className));
}
if (!assignableTo.isAssignableFrom(c)) {
messages.add(MessageUtils.getExceptionMessageString(MessageUtils.VERIFIER_WRONG_TYPE_ID, type, className));
}
}
}
}