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package com.sun.faces.config;

import com.sun.faces.RIConstants;
import com.sun.faces.util.MessageUtils;
import com.sun.faces.util.Util;

import java.lang.reflect.Constructor;
import java.lang.reflect.Modifier;
import java.util.ArrayList;
import java.util.List;

/**
 * 

* 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)); } } } }




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