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ConfigManager.java

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 1997-2010 Sun Microsystems, Inc. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License. You can obtain
 * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
 * or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
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 * When distributing the software, include this License Header Notice in each
 * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
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package com.sun.faces.config;

import static com.sun.faces.config.WebConfiguration.BooleanWebContextInitParameter.ValidateFacesConfigFiles;
import static com.sun.faces.config.WebConfiguration.BooleanWebContextInitParameter.DisableFaceletJSFViewHandler;
import static com.sun.faces.config.WebConfiguration.BooleanWebContextInitParameter.EnableThreading;
import com.sun.faces.spi.ConfigurationResourceProvider;
import com.sun.faces.spi.ConfigurationResourceProviderFactory;
import com.sun.faces.spi.AnnotationProvider;
import com.sun.faces.spi.AnnotationProviderFactory;
import static com.sun.faces.spi.ConfigurationResourceProviderFactory.ProviderType.*;
import static com.sun.faces.spi.ConfigurationResourceProviderFactory.ProviderType.FaceletConfig;
import com.sun.faces.config.configprovider.MetaInfFacesConfigResourceProvider;
import com.sun.faces.config.configprovider.MojarraFacesConfigResourceProvider;
import com.sun.faces.config.configprovider.WebFacesConfigResourceProvider;
import com.sun.faces.config.configprovider.MetaInfFaceletTaglibraryConfigProvider;
import com.sun.faces.config.configprovider.WebFaceletTaglibResourceProvider;
import com.sun.faces.config.processor.ApplicationConfigProcessor;
import com.sun.faces.config.processor.BehaviorConfigProcessor;
import com.sun.faces.config.processor.ComponentConfigProcessor;
import com.sun.faces.config.processor.ConfigProcessor;
import com.sun.faces.config.processor.ConverterConfigProcessor;
import com.sun.faces.config.processor.FactoryConfigProcessor;
import com.sun.faces.config.processor.LifecycleConfigProcessor;
import com.sun.faces.config.processor.ManagedBeanConfigProcessor;
import com.sun.faces.config.processor.NavigationConfigProcessor;
import com.sun.faces.config.processor.RenderKitConfigProcessor;
import com.sun.faces.config.processor.ValidatorConfigProcessor;
import com.sun.faces.config.processor.FaceletTaglibConfigProcessor;
import com.sun.faces.util.FacesLogger;
import com.sun.faces.util.Timer;
import org.xml.sax.InputSource;

import javax.faces.FacesException;
import javax.faces.FactoryFinder;
import javax.faces.event.PostConstructApplicationEvent;
import javax.faces.application.Application;
import javax.faces.context.FacesContext;
import javax.servlet.ServletContext;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMResult;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamSource;

import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;
import java.text.MessageFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.regex.Pattern;
import java.util.regex.Matcher;
import java.util.concurrent.Callable;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.FutureTask;
import java.util.concurrent.Future;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.lang.annotation.Annotation;

import org.w3c.dom.*;
import org.xml.sax.SAXParseException;

/**
 * <p>
 *  This class manages the initialization of each web application that uses
 *  JSF.
 * </p>
 */
00119 public class ConfigManager {

    private static final Logger LOGGER = FacesLogger.CONFIG.getLogger();

    private static final Pattern JAR_PATTERN = Pattern.compile("(.*/(\\S*\\.jar)).*(/faces-config.xml|/*.\\.faces-config.xml)");

    /**
     * <p>
     * A List of resource providers that search for faces-config documents.
     * By default, this contains a provider for the Mojarra, and two other
     * providers to satisfy the requirements of the specification.
     * </p>
     */
00132     private static final List<ConfigurationResourceProvider> FACES_CONFIG_RESOURCE_PROVIDERS;

    /**
     * <p>
     * A List of resource providers that search for faces-config documents.
     * By default, this contains a provider for the Mojarra, and one other
     * providers to satisfy the requirements of the specification.
     * </p>
     */
00141     private static final List<ConfigurationResourceProvider> FACELET_TAGLIBRARY_RESOURCE_PROVIDERS;

    /**
     * <p>
     *  The <code>ConfigManager</code> will multithread the calls to the
     *  <code>ConfigurationResourceProvider</code>s as well as any calls
     *  to parse a resources into a DOM.  By default, we'll use only 5 threads
     *  per web application.
     * </p>
     */
00151     private static final int NUMBER_OF_TASK_THREADS = 5;

    /**
     * <p>
     *  There is only once instance of <code>ConfigManager</code>.
     * <p>
     */
00158     private static final ConfigManager CONFIG_MANAGER = new ConfigManager();


    /**
     * The application-scoped key under which the Future responsible for annotation
     * scanning is associated with.
     */
00165     private static final String ANNOTATIONS_SCAN_TASK_KEY =
          ConfigManager.class.getName() + "_ANNOTATION_SCAN_TASK";


    /**
     * Name of the attribute added by {@link ParseTask} to indiciate a
     * {@link Document} instance as a representation of
     * <code>/WEB-INF/faces-config.xml</code>.
     */
00174     public static final String WEB_INF_MARKER = "com.sun.faces.webinf";


    /**
     * <p>
     *   Contains each <code>ServletContext</code> that we've initialized.
     *   The <code>ServletContext</code> will be removed when the application
     *   is destroyed.
     * </p>
     */
    @SuppressWarnings({"CollectionWithoutInitialCapacity"})
00185     private List<ServletContext> initializedContexts =
         new CopyOnWriteArrayList<ServletContext>();

    /**
     * <p>
     *  The chain of {@link ConfigProcessor} instances to processing of
     *  faces-config documents.
     * </p>
     */
00194     private static final ConfigProcessor FACES_CONFIG_PROCESSOR_CHAIN;


    /**
     * <p>
     *  The chain of {@link ConfigProcessor} instances to processing of
     *  facelet-taglib documents.
     * </p>
     */
00203     private static final ConfigProcessor FACELET_TAGLIB_CONFIG_PROCESSOR_CHAIN;

    /**
     * Stylesheet to convert 1.0 and 1.1 based faces-config documents
     * to our private 1.1 schema for validation.
     */
00209     private static final String FACES_TO_1_1_PRIVATE_XSL =
          "/com/sun/faces/jsf1_0-1_1toSchema.xsl";

    /**
     * Stylesheet to convert 1.0 facelet-taglib documents
     * from 1.0 to 2.0 for schema validation purposes.
     */
00216     private static final String FACELETS_TO_2_0_XSL =
          "/com/sun/faces/facelets1_0-2_0toSchema.xsl";

    private static final String FACES_CONFIG_1_X_DEFAULT_NS =
          "http://java.sun.com/JSF/Configuration";

    private static final String FACELETS_1_0_DEFAULT_NS =
          "http://java.sun.com/JSF/Facelet";


    static {

        // initialize the resource providers for faces-config documents
        List<ConfigurationResourceProvider> facesConfigProviders =
          new ArrayList<ConfigurationResourceProvider>(3);
        facesConfigProviders.add(new MojarraFacesConfigResourceProvider());
        facesConfigProviders.add(new MetaInfFacesConfigResourceProvider());
        facesConfigProviders.add(new WebFacesConfigResourceProvider());
        FACES_CONFIG_RESOURCE_PROVIDERS = Collections.unmodifiableList(facesConfigProviders);

        // initialize the resource providers for facelet-taglib documents
        List<ConfigurationResourceProvider> faceletTaglibProviders =
              new ArrayList<ConfigurationResourceProvider>(3);
        faceletTaglibProviders.add(new MetaInfFaceletTaglibraryConfigProvider());
        faceletTaglibProviders.add(new WebFaceletTaglibResourceProvider());
        FACELET_TAGLIBRARY_RESOURCE_PROVIDERS = Collections.unmodifiableList(faceletTaglibProviders);

        // initialize the config processors for faces-config documents
        ConfigProcessor[] configProcessors = {
             new FactoryConfigProcessor(),
             new LifecycleConfigProcessor(),
             new ApplicationConfigProcessor(),
             new ComponentConfigProcessor(),
             new ConverterConfigProcessor(),
             new ValidatorConfigProcessor(),
             new ManagedBeanConfigProcessor(),
             new RenderKitConfigProcessor(),
             new NavigationConfigProcessor(),
             new BehaviorConfigProcessor(),
        };
        for (int i = 0; i < configProcessors.length; i++) {
            ConfigProcessor p = configProcessors[i];
            if ((i + 1) < configProcessors.length) {
                p.setNext(configProcessors[i + 1]);
            }
        }
        FACES_CONFIG_PROCESSOR_CHAIN = configProcessors[0];

        // initialize the config processor for facelet-taglib documents
        FACELET_TAGLIB_CONFIG_PROCESSOR_CHAIN = new FaceletTaglibConfigProcessor();

    }


    // ---------------------------------------------------------- Public Methods


    /**
     * @return a <code>ConfigManager</code> instance
     */
00276     public static ConfigManager getInstance() {

        return CONFIG_MANAGER;

    }


    /**
     * <p>
     *   This method bootstraps JSF based on the parsed configuration resources.
     * </p>
     *
     * @param sc the <code>ServletContext</code> for the application that
     *  requires initialization
     */
00291     public void initialize(ServletContext sc) {

        if (!hasBeenInitialized(sc)) {
            initializedContexts.add(sc);
            ExecutorService executor = null;
            try {
                WebConfiguration webConfig = WebConfiguration.getInstance(sc);
                boolean validating = webConfig.isOptionEnabled(ValidateFacesConfigFiles);
                if (useThreads(sc)) {
                    executor = createExecutorService();
                }

                DocumentInfo[] facesDocuments =
                      getConfigDocuments(sc,
                                         getFacesConfigResourceProviders(),
                                         executor,
                                         validating);

                FacesConfigInfo webInfFacesConfigInfo =
                      new FacesConfigInfo(facesDocuments[facesDocuments.length - 1]);

                facesDocuments = sortDocuments(facesDocuments, webInfFacesConfigInfo);

                boolean isFaceletsDisabled =
                      isFaceletsDisabled(webConfig, webInfFacesConfigInfo);
                if (!webInfFacesConfigInfo.isWebInfFacesConfig() || !webInfFacesConfigInfo.isMetadataComplete()) {
                    // execute the Task responsible for finding annotation classes
                    Set<URL> scanUrls = getAnnotationScanURLs(facesDocuments);
                    Future<Map<Class<? extends Annotation>,Set<Class<?>>>> annotationScan;
                    if (executor != null) {
                        annotationScan = executor.submit(new AnnotationScanTask(sc, scanUrls));
                        pushTaskToContext(sc, annotationScan);
                    } else {
                        annotationScan =
                              new FutureTask<Map<Class<? extends Annotation>,Set<Class<?>>>>(new AnnotationScanTask(sc, scanUrls));
                        ((FutureTask) annotationScan).run();
                    }
                    pushTaskToContext(sc, annotationScan);
                }

                // process the ordered documents
                FACES_CONFIG_PROCESSOR_CHAIN.process(sc, facesDocuments);
                if (!isFaceletsDisabled) {
                    FACELET_TAGLIB_CONFIG_PROCESSOR_CHAIN.process(
                          sc, getConfigDocuments(sc,
                                             getFaceletConfigResourceProviders(),
                                             executor,
                                             validating));
                }

                publishPostConfigEvent();
            } catch (Exception e) {
                // clear out any configured factories
                releaseFactories();
                if (LOGGER.isLoggable(Level.INFO)) {
                    LOGGER.log(Level.INFO,
                               "Unsanitized stacktrace from failed start...",
                               e);
                }
                Throwable t = unwind(e);
                throw new ConfigurationException("CONFIGURATION FAILED! " + t.getMessage(),
                                                 t);
            } finally {
                if (executor != null) {
                    executor.shutdown();
                }
                sc.removeAttribute(ANNOTATIONS_SCAN_TASK_KEY);
            }
        }

    }




    /**
     * <p>
     *   This method will remove any information about the application.
     * </p>
     * @param sc the <code>ServletContext</code> for the application that
     *  needs to be removed
     */
00373     public void destory(ServletContext sc) {

        releaseFactories();
        initializedContexts.remove(sc);

    }


    /**
     * @param sc the <code>ServletContext</code> for the application in question
     * @return <code>true</code> if this application has already been initialized,
     *  otherwise returns </code>fase</code>
     */
00386     public boolean hasBeenInitialized(ServletContext sc) {

        return (initializedContexts.contains(sc));

    }


    /**
     * @return the results of the annotation scan task
     */
00396     public static Map<Class<? extends Annotation>,Set<Class<?>>> getAnnotatedClasses(FacesContext ctx) {

        Map<String, Object> appMap =
              ctx.getExternalContext().getApplicationMap();
        //noinspection unchecked
        Future<Map<Class<? extends Annotation>,Set<Class<?>>>> scanTask =
              (Future<Map<Class<? extends Annotation>,Set<Class<?>>>>) appMap.get(ANNOTATIONS_SCAN_TASK_KEY);
        try {
            return ((scanTask != null)
                    ? scanTask.get()
                    : Collections.<Class<? extends Annotation>,Set<Class<?>>>emptyMap());
        } catch (Exception e) {
            throw new FacesException(e);
        }

    }


    // --------------------------------------------------------- Private Methods


    private static Set<URL> getAnnotationScanURLs(DocumentInfo[] documentInfos) {

        Set<URL> urls = new HashSet<URL>(documentInfos.length);
        Set<String> jarNames = new HashSet<String>(documentInfos.length);
        for (DocumentInfo docInfo : documentInfos) {
            Matcher m = JAR_PATTERN.matcher(docInfo.getSourceURL().toString());
            if (m.matches()) {
                String jarName = m.group(2);
                if (!jarNames.contains(jarName)) {
                    FacesConfigInfo configInfo = new FacesConfigInfo(docInfo);
                    if (!configInfo.isMetadataComplete()) {
                        urls.add(docInfo.getSourceURL());
                        jarNames.add(jarName);
                    }
                }
            }
        }

        return urls;

    }


    private static boolean useThreads(ServletContext ctx) {

        WebConfiguration config = WebConfiguration.getInstance(ctx);
        return config.isOptionEnabled(EnableThreading);

    }


    private List<ConfigurationResourceProvider> getFacesConfigResourceProviders() {

        return getConfigurationResourceProviders(FACES_CONFIG_RESOURCE_PROVIDERS,
                                                 FacesConfig);

    }


    private List<ConfigurationResourceProvider> getFaceletConfigResourceProviders() {

        return getConfigurationResourceProviders(FACELET_TAGLIBRARY_RESOURCE_PROVIDERS,
                                                 FaceletConfig);

    }


    private List<ConfigurationResourceProvider> getConfigurationResourceProviders(List<ConfigurationResourceProvider> defaultProviders,
                                                                                  ConfigurationResourceProviderFactory.ProviderType providerType) {

        ConfigurationResourceProvider[] custom =
              ConfigurationResourceProviderFactory.createProviders(providerType);
        if (custom.length == 0) {
            return defaultProviders;
        } else {
            List<ConfigurationResourceProvider> list = new ArrayList<ConfigurationResourceProvider>();
            list.addAll(defaultProviders);
            // insert the custom providers after the META-INF providers and
            // before those that scan /WEB-INF
            list.addAll((defaultProviders.size() - 1), Arrays.asList(custom));
            return Collections.unmodifiableList(list);
        }

    }


    /**
     * <p>
     * Sort the <code>faces-config</code> documents found on the classpath
     * and those specified by the <code>javax.faces.CONFIG_FILES</code> context
     * init parameter.
     * </p>
     *
     * @param facesDocuments an array of <em>all</em> <code>faces-config</code>
     *  documents
     * @param webInfFacesConfig FacesConfigInfo representing the WEB-INF/faces-config.xml
     *  for this app
     *
     * @return the sorted documents
     */
00497     private DocumentInfo[] sortDocuments(DocumentInfo[] facesDocuments,
                                         FacesConfigInfo webInfFacesConfig) {


        int len = (webInfFacesConfig.isWebInfFacesConfig()
                     ? facesDocuments.length - 1
                     : facesDocuments.length);

        List<String> absoluteOrdering = webInfFacesConfig.getAbsoluteOrdering();

        if (len > 1) {
            List<DocumentOrderingWrapper> list =
                  new ArrayList<DocumentOrderingWrapper>();
            for (int i = 1; i < len; i++) {
                list.add(new DocumentOrderingWrapper(facesDocuments[i]));
            }
            DocumentOrderingWrapper[] ordering =
                  list.toArray(new DocumentOrderingWrapper[list.size()]);
            if (absoluteOrdering == null) {
                DocumentOrderingWrapper.sort(ordering);
                // sorting complete, now update the appropriate locations within
                // the original array with the sorted documentation.
                for (int i = 1; i < len; i++) {
                    facesDocuments[i] = ordering[i - 1].getDocument();
                }
                return facesDocuments;
            } else {
                DocumentOrderingWrapper[] result =
                      DocumentOrderingWrapper.sort(ordering, absoluteOrdering);
                DocumentInfo[] ret = new DocumentInfo[((webInfFacesConfig.isWebInfFacesConfig()) ? (result.length + 2) : (result.length + 1))];
                for (int i = 1; i < len; i++) {
                    ret[i] = result[i - 1].getDocument();
                }
                // add the impl specific config file
                ret[0] = facesDocuments[0];
                // add the WEB-INF if necessary
                if (webInfFacesConfig.isWebInfFacesConfig()) {
                    ret[ret.length - 1] = facesDocuments[facesDocuments.length - 1];
                }
                return ret;
            }
        }

        return facesDocuments;
    }


    /**
     * <p>
     * Utility method to check if JSF 2.0 Facelets should be disabled.
     * If it's not explicitly disabled by the context init parameter, then
     * check the version of the WEB-INF/faces-config.xml document.  If the version
     * is less than 2.0, then override the default value for the context init
     * parameter so that other parts of the system that use that config option
     * will know it has been disabled.
     * </p>
     *
     * <p>
     * NOTE:  Since this method overrides a configuration value, it should
     * be called before *any* document parsing is performed the configuration
     * value may be queried by the <code>ConfigParser</code>s.
     * </p>
     *
     * @param webconfig configuration for this application
     * @param facesConfigInfo object representing WEB-INF/faces-config.xml
     * @return <code>true</code> if Facelets should be disabled
     */
00564     private boolean isFaceletsDisabled(WebConfiguration webconfig,
                                       FacesConfigInfo facesConfigInfo) {

        boolean isFaceletsDisabled = webconfig.isOptionEnabled(DisableFaceletJSFViewHandler);
        if (!isFaceletsDisabled) {
            // if not explicitly disabled, make a sanity check against
            // /WEB-INF/faces-config.xml
            isFaceletsDisabled = !facesConfigInfo.isVersionGreaterOrEqual(2.0);
            webconfig.overrideContextInitParameter(DisableFaceletJSFViewHandler, isFaceletsDisabled);
        }
        return isFaceletsDisabled;

    }


    /**
     * Push the provided <code>Future</code> to the specified <code>ServletContext</code>.
     */
00582     private void pushTaskToContext(ServletContext sc,
                                   Future<Map<Class<? extends Annotation>,Set<Class<?>>>> scanTask) {

        sc.setAttribute(ANNOTATIONS_SCAN_TASK_KEY, scanTask);

    }


    /**
     * Publishes a {@link javax.faces.event.PostConstructApplicationEvent} event for the current
     * {@link Application} instance.
     */
00594     private void publishPostConfigEvent() {

        FacesContext ctx = FacesContext.getCurrentInstance();
        Application app = ctx.getApplication();
        app.publishEvent(ctx,
                         PostConstructApplicationEvent.class,
                         Application.class,
                         app);

    }


    /**
     * <p>
     *   Obtains an array of <code>Document</code>s to be processed
     *   by {@link ConfigManager#FACES_CONFIG_PROCESSOR_CHAIN}.
     * </p>
     *
     * @param sc the <code>ServletContext</code> for the application to be
     *  processed
     * @param providers <code>List</code> of <code>ConfigurationResourceProvider</code>
     *  instances that provide the URL of the documents to parse.
     * @param executor the <code>ExecutorService</code> used to dispatch parse
     *  request to
     * @param validating flag indicating whether or not the documents
     *  should be validated
     * @return an array of <code>DocumentInfo</code>s
     */
00622     private static DocumentInfo[] getConfigDocuments(ServletContext sc,
                                                 List<ConfigurationResourceProvider> providers,
                                                 ExecutorService executor,
                                                 boolean validating) {

        List<FutureTask<Collection<URL>>> urlTasks =
             new ArrayList<FutureTask<Collection<URL>>>(providers.size());
        for (ConfigurationResourceProvider p : providers) {
            FutureTask<Collection<URL>> t =
                 new FutureTask<Collection<URL>>(new URLTask(p, sc));
            urlTasks.add(t);
            if (executor != null) {
                executor.execute(t);
            } else {
                t.run();
            }
        }

        List<FutureTask<DocumentInfo>> docTasks =
             new ArrayList<FutureTask<DocumentInfo>>(providers.size() << 1);

        for (FutureTask<Collection<URL>> t : urlTasks) {
            try {
                Collection<URL> l = t.get();
                for (URL u : l) {
                    FutureTask<DocumentInfo> d =
                         new FutureTask<DocumentInfo>(new ParseTask(validating, u));
                    docTasks.add(d);
                    if (executor != null) {
                        executor.execute(d);
                    } else {
                        d.run();
                    }
                }
            } catch (InterruptedException ignored) {
            } catch (Exception e) {
                throw new ConfigurationException(e);
            }
        }

        List<DocumentInfo> docs = new ArrayList<DocumentInfo>(docTasks.size());
        for (FutureTask<DocumentInfo> t : docTasks) {
            try {
                docs.add(t.get());
            } catch (ExecutionException e) {
                throw new ConfigurationException(e);
            } catch (InterruptedException ignored) { }
        }

        return docs.toArray(new DocumentInfo[docs.size()]);

    }


    /**
     * Create a new <code>ExecutorService</code> with
     * {@link #NUMBER_OF_TASK_THREADS} threads.
     */
00680     private static ExecutorService createExecutorService() {

        int tc = Runtime.getRuntime().availableProcessors();
        if (tc > NUMBER_OF_TASK_THREADS) {
            tc = NUMBER_OF_TASK_THREADS;
        }
        return Executors.newFixedThreadPool(tc);

    }


    /**
     * @param throwable Throwable
     * @return the root cause of this error
     */
00695     private Throwable unwind(Throwable throwable) {

          Throwable t = null;
          if (throwable != null) {
              t =  unwind(throwable.getCause());
              if (t == null) {
                  t = throwable;
              }
          }
          return t;

    }


    /**
     * Calls through to {@link javax.faces.FactoryFinder#releaseFactories()}
     * ignoring any exceptions.
     */
00713     private void releaseFactories() {
        try {
            FactoryFinder.releaseFactories();
        } catch (FacesException ignored) {
            if (LOGGER.isLoggable(Level.FINE)) {
                LOGGER.log(Level.FINE,
                           "Exception thrown from FactoryFinder.releaseFactories()",
                           ignored);
            }
        }
    }


    // ----------------------------------------------------------- Inner Classes


    /**
     * Scans the class files within a web application returning a <code>Set</code>
     * of classes that have been annotated with a standard Faces annotation.
     */
    private static class AnnotationScanTask implements Callable<Map<Class<? extends Annotation>,Set<Class<?>>>> {

        private ServletContext sc;
        private Set<URL> urls;
        AnnotationProvider provider;

        // -------------------------------------------------------- Constructors


        public AnnotationScanTask(ServletContext sc, Set<URL> urls) {

            this.sc = sc;
            this.urls = urls;
            provider = AnnotationProviderFactory.createAnnotationProvider(sc);

        }


        // ----------------------------------------------- Methods from Callable


        public Map<Class<? extends Annotation>,Set<Class<?>>> call() throws Exception {

            Timer t = Timer.getInstance();
            if (t != null) {
                t.startTiming();
            }

            //AnnotationScanner scanner = new AnnotationScanner(sc);
            Map<Class<? extends Annotation>,Set<Class<?>>> annotatedClasses =
                  provider.getAnnotatedClasses(urls);

            if (t != null) {
                t.stopTiming();
                t.logResult("Configuration annotation scan complete.");
            }

            return annotatedClasses;

        }


    } // END AnnotationScanTask


    /**
     * <p>
     *  This <code>Callable</code> will be used by {@link ConfigManager#getConfigDocuments(javax.servlet.ServletContext, java.util.List, java.util.concurrent.ExecutorService, boolean)}.
     *  It represents a single configuration resource to be parsed into a DOM.
     * </p>
     */
    private static class ParseTask implements Callable<DocumentInfo> {
        private static final String JAVAEE_SCHEMA_DEFAULT_NS =
            "http://java.sun.com/xml/ns/javaee";
        private static final String EMPTY_FACES_CONFIG =
                "com/sun/faces/empty-faces-config.xml";
        private URL documentURL;
        private DocumentBuilderFactory factory;
        private boolean validating;

        // -------------------------------------------------------- Constructors


        /**
         * <p>
         *   Constructs a new ParseTask instance
         * </p>
         *
         * @param validating whether or not we're validating
         * @param documentURL a URL to the configuration resource to be parsed
         * @throws Exception general error
         */
        public ParseTask(boolean validating, URL documentURL)
        throws Exception {

            this.documentURL = documentURL;
            this.factory = DbfFactory.getFactory();
            this.validating = validating;

        }


        // ----------------------------------------------- Methods from Callable


        /**
         * @return the result of the parse operation (a DOM)
         * @throws Exception if an error occurs during the parsing process
         */
        public DocumentInfo call() throws Exception {

            try {
                Timer timer = Timer.getInstance();
                if (timer != null) {
                    timer.startTiming();
                }

                Document d = getDocument();

                if (timer != null) {
                    timer.stopTiming();
                    timer.logResult("Parse " + documentURL.toExternalForm());
                }

                return new DocumentInfo(d, documentURL);
            } catch (Exception e) {
                throw new ConfigurationException(MessageFormat.format(
                     "Unable to parse document ''{0}'': {1}",
                     documentURL.toExternalForm(),
                     e.getMessage()), e);
            }
        }


        // ----------------------------------------------------- Private Methods


        /**
         * @return <code>Document</code> based on <code>documentURL</code>.
         * @throws Exception if an error occurs during the process of building a
         *  <code>Document</code>
         */
        private Document getDocument() throws Exception {

            Document returnDoc;
            DocumentBuilder db = getNonValidatingBuilder();
            InputSource is = new InputSource(getInputStream(documentURL));
                is.setSystemId(documentURL.toExternalForm());
            Document doc = null;

            try {
                doc = db.parse(is);
            } catch (SAXParseException spe) {
                // [mojarra-1693]
                // Test if this is a zero length or whitespace only faces-config.xml file.
                // If so, just make an empty Document
                InputStream stream = is.getByteStream();
                stream.close();

                is = new InputSource(getInputStream(documentURL));
                stream = is.getByteStream();
                if (streamIsZeroLengthOrEmpty(stream) &&
                    documentURL.toExternalForm().endsWith("faces-config.xml")) {
                    ClassLoader loader = this.getClass().getClassLoader();
                    is = new InputSource(getInputStream(loader.getResource(EMPTY_FACES_CONFIG)));
                    doc = db.parse(is);
                } 

            }
            String documentNS = doc.getDocumentElement().getNamespaceURI();
            if (validating && documentNS != null) {
                DOMSource domSource
                     = new DOMSource(doc, documentURL.toExternalForm());

                /*
                 * If the Document in question is 1.2 (i.e. it has a namespace matching
                 * JAVAEE_SCHEMA_DEFAULT_NS, then perform validation using the cached schema
                 * and return.  Otherwise we assume a 1.0 or 1.1 faces-config in which case
                 * we need to transform it to reference a special 1.1 schema before validating.
                 */
                Node documentElement = ((Document) domSource.getNode()).getDocumentElement();
                if (JAVAEE_SCHEMA_DEFAULT_NS.equals(documentNS)) {
                    Attr version = (Attr)
                            documentElement.getAttributes().getNamedItem("version");
                    DbfFactory.FacesSchema schema;
                    if (version != null) {
                        String versionStr = version.getValue();
                        if ("2.0".equals(versionStr)) {
                            if ("facelet-taglib".equals(documentElement.getLocalName())) {
                                schema = DbfFactory.FacesSchema.FACELET_TAGLIB_20;
                            } else {
                                schema = DbfFactory.FacesSchema.FACES_20;
                            }
                        } else if ("1.2".equals(versionStr)) {
                            schema = DbfFactory.FacesSchema.FACES_12;
                        } else {
                            throw new ConfigurationException("Unknown Schema version: " + versionStr);
                        }
                        DocumentBuilder builder = getBuilderForSchema(schema);
                        if (builder.isValidating()) {
                            builder.getSchema().newValidator().validate(domSource);
                            returnDoc = ((Document) domSource.getNode());
                        } else {
                            returnDoc = ((Document) domSource.getNode());
                        }
                    } else {
                        // this shouldn't happen, but...
                        throw new ConfigurationException("No document version available.");
                    }
                } else {
                    DOMResult domResult = new DOMResult();
                    Transformer transformer = getTransformer(documentNS);
                    transformer.transform(domSource, domResult);
                    // copy the source document URI to the transformed result
                    // so that processes that need to build URLs relative to the
                    // document will work as expected.
                    ((Document) domResult.getNode())
                          .setDocumentURI(((Document) domSource
                                .getNode()).getDocumentURI());
                    DbfFactory.FacesSchema schemaToApply;
                    if (FACES_CONFIG_1_X_DEFAULT_NS.equals(documentNS)) {
                        schemaToApply = DbfFactory.FacesSchema.FACES_11;
                    } else if (FACELETS_1_0_DEFAULT_NS.equals(documentNS)) {
                        schemaToApply = DbfFactory.FacesSchema.FACELET_TAGLIB_20;
                    } else {
                        throw new IllegalStateException();
                    }
                    DocumentBuilder builder = getBuilderForSchema(schemaToApply);
                    if (builder.isValidating()) {
                        builder.getSchema().newValidator().validate(new DOMSource(domResult.getNode()));
                        returnDoc = (Document) domResult.getNode();
                    } else {
                        returnDoc = (Document) domResult.getNode();
                    }
                }
            } else {
                returnDoc = doc;
            }

            // mark this document as the parsed representation of the
            // WEB-INF/faces-config.xml.  This is used later in the configuration
            // processing.
            if (documentURL.toExternalForm().contains("/WEB-INF/faces-config.xml")) {
                Attr webInf = returnDoc.createAttribute(WEB_INF_MARKER);
                webInf.setValue("true");
                returnDoc.getDocumentElement().getAttributes().setNamedItem(webInf);
            }
            return returnDoc;

        }

        private boolean streamIsZeroLengthOrEmpty(InputStream is) throws IOException {
            boolean isZeroLengthOrEmpty = (0 == is.available());
            final int size = 1024;
            byte[] b = new byte[size];
            String s;
            while (!isZeroLengthOrEmpty && -1 != is.read(b, 0, size)) {
                s = (new String(b)).trim();
                isZeroLengthOrEmpty = 0 == s.length();
                b[0] = 0;
                for (int i = 1; i < size; i += i) {
                    System.arraycopy(b, 0, b, i, ((size - i) < i) ? (size - i) : i);
                }
            }

            return isZeroLengthOrEmpty;
        }


        /**
         * Obtain a <code>Transformer</code> using the style sheet
         * referenced by the <code>XSL</code> constant.
         *
         * @return a new Tranformer instance
         * @throws Exception if a Tranformer instance could not be created
         */
        private static Transformer getTransformer(String documentNS)
        throws Exception {

            TransformerFactory factory = TransformerFactory.newInstance();
            String xslToApply;
            if (FACES_CONFIG_1_X_DEFAULT_NS.equals(documentNS)) {
                xslToApply = FACES_TO_1_1_PRIVATE_XSL;
            } else if (FACELETS_1_0_DEFAULT_NS.equals(documentNS)) {
                xslToApply = FACELETS_TO_2_0_XSL;
            } else {
                throw new IllegalStateException();
            }
            return factory
                 .newTransformer(new StreamSource(getInputStream(ConfigManager
                      .class.getResource(xslToApply))));

        }


        /**
         * @return an <code>InputStream</code> to the resource referred to by
         *         <code>url</code>
         * @param url source <code>URL</code>
         * @throws IOException if an error occurs
         */
        private static InputStream getInputStream(URL url) throws IOException {

            URLConnection conn = url.openConnection();
            conn.setUseCaches(false);
            return new BufferedInputStream(conn.getInputStream());

        }



        private DocumentBuilder getNonValidatingBuilder() throws Exception {

            DocumentBuilderFactory tFactory = DbfFactory.getFactory();
            tFactory.setValidating(false);
            DocumentBuilder tBuilder = tFactory.newDocumentBuilder();
            tBuilder.setEntityResolver(DbfFactory.FACES_ENTITY_RESOLVER);
            tBuilder.setErrorHandler(DbfFactory.FACES_ERROR_HANDLER);
            return tBuilder;

        }

        private DocumentBuilder getBuilderForSchema(DbfFactory.FacesSchema schema)
        throws Exception {
            try {
                factory.setSchema(schema.getSchema());
            } catch (UnsupportedOperationException upe) {
                return getNonValidatingBuilder();
            }
            DocumentBuilder builder = factory.newDocumentBuilder();
            builder.setEntityResolver(DbfFactory.FACES_ENTITY_RESOLVER);
            builder.setErrorHandler(DbfFactory.FACES_ERROR_HANDLER);
            return builder;
        }

    } // END ParseTask


    /**
     * <p>
     *  This <code>Callable</code> will be used by {@link ConfigManager#getConfigDocuments(javax.servlet.ServletContext, java.util.List, java.util.concurrent.ExecutorService, boolean)}.
     *  It represents one or more URLs to configuration resources that require
     *  processing.
     * </p>
     */
    private static class URLTask implements Callable<Collection<URL>> {

        private ConfigurationResourceProvider provider;
        private ServletContext sc;


        // -------------------------------------------------------- Constructors


        /**
         * Constructs a new <code>URLTask</code> instance.
         * @param provider the <code>ConfigurationResourceProvider</code> from
         *  which zero or more <code>URL</code>s will be returned
         * @param sc the <code>ServletContext</code> of the current application
         */
        public URLTask(ConfigurationResourceProvider provider,
                       ServletContext sc) {
            this.provider = provider;
            this.sc = sc;
        }


        // ----------------------------------------------- Methods from Callable


        /**
         * @return zero or more <code>URL</code> instances
         * @throws Exception if an Exception is thrown by the underlying
         *  <code>ConfigurationResourceProvider</code> 
         */
        public Collection<URL> call() throws Exception {
            return provider.getResources(sc);
        }

    } // END URLTask


}

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