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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 1997-2007 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
 * http://www.netbeans.org/cddl-gplv2.html
 * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the
 * specific language governing permissions and limitations under the
 * License.  When distributing the software, include this License Header
 * Notice in each file and include the License file at
 * nbbuild/licenses/CDDL-GPL-2-CP.  Sun designates this
 * particular file as subject to the "Classpath" exception as provided
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 * accompanied this code. If applicable, add the following below the
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 * The Original Software is NetBeans. The Initial Developer of the Original
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 * However, if you add GPL Version 2 code and therefore, elected the GPL
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 */

package org.openide;

import java.io.IOException;
import java.io.PrintStream;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.ResourceBundle;
import java.util.Set;
import java.util.WeakHashMap;
import java.util.concurrent.Callable;
import java.util.logging.Level;
import java.util.logging.LogRecord;
import java.util.logging.Logger;
import org.openide.util.Enumerations;
import org.openide.util.Lookup;
import org.openide.util.LookupEvent;
import org.openide.util.LookupListener;
import org.openide.util.WeakSet;

/**
 * A more or less <em>deprecated</em> system of managing, annotating, and classifying errors
 *  and log messages. Instead of <code>ErrorManager</code> use
 * {@link Logger} as described in <a href="@TOP@/org/openide/util/doc-files/logging.html">NetBeans logging guide</a>.
 * <p>
 * Rather then using the {@link ErrorManager} consider using JDK's {@link Logger}
 * for reporting log events, unwanted exceptions, etc.  The methods
 * in this class which are deprecated are annotated with a description
 * how to use use the {@link Logger} methods to achieve the same goal.
 * </p>
 * <p>
 * The levels in descending order are:
 * <ul>
 * <li>ERROR (highest value)
 * <li>EXCEPTION
 * <li>USER
 * <li>WARNING
 * <li>INFORMATIONAL
 * <li>UNKNOWN (lowest value)
 * </ul>
 * </p>
 *
 * <div class="nonnormative">
 * <p>How to...</p>
 * <dl>
 *
 * <dt>Handle an exception</dt>
 * <dd>
 * <p>If it might be an important error (show the user):</p>
 * <pre>
 * try {
 *     foo.doSomething();
 * } catch (IOException ioe) {
 * <!--
 *     Logger.getLogger(YourClass.class.getName()).log(Level.SEVERE, "msg", ioe);
 *     // used to be
 * -->
 * ErrorManager.getDefault().notify(ioe);
 * <!--
 * }
 * -->
 * </pre>
 * <p>If it is not very important but should be sent to the log file:</p>
 * <pre>
 * try {
 *     foo.doSomething();
 * } catch (IOException ioe) {
 *     Logger.getLogger(YourClass.class.getName()).log(Level.CONFIG, "msg", ioe);
 *     // used to be:
 *     // ErrorManager.getDefault().notify(ErrorManager.INFORMATIONAL, ioe);
 * }
 * </pre>
 * <p>If it is the normal outcome of a user action
 * and there is no need to show stack traces to the user:</p>
 * <pre>
 * try {
 *     foo.doSomething();
 * } catch (IOException ioe) {
 * <!--
 *     Logger.getAnonymousLogger().log(Level.INFO, "msg", ioe);
 *     // used to be:
 * -->
 *     ErrorManager.getDefault().notify(ErrorManager.USER, ioe);
 * }
 * </pre>
 * <p>You can also specify the severity when you are creating the
 * exception (by annotating it), rather than relying on the notifier
 * to do this. In that case, if the notifier just use the plain form
 * of <code>notify</code> (i.e. <code>UNKNOWN</code> severity), the
 * annotated severity is used.</p>
 * </dd>
 *
 * <dt>Retain nested stacktraces / change exception type</dt>
 * <dd>
 * <pre>
 * public void doSomething() throws IOException {
 *     try {
 *         doSomethingElse();
 *     } catch (IllegalArgumentException iae) {
 *         IOException ioe = new IOException("did not work: " + iae);
 *         ioe.initCause(iae);
 *         // used to be: ErrorManager.getDefault().annotate(ioe, iae);
 *         throw ioe;
 *     }
 * }
 * </pre>
 * <p>You can also just use JDK 1.4 causes:</p>
 * <pre>
 * public void doSomething() throws IOException {
 *     try {
 *         doSomethingElse();
 *     } catch (IllegalArgumentException iae) {
 *         IOException ioe = new IOException("did not work: " + iae);
 *         ioe.initCause(iae);
 *         throw ioe;
 *     }
 * }
 * // ...
 * try {
 *     foo.doSomething();
 * } catch (IOException ioe) {
 *     // The IllegalArgumentException is still available here:
 *     ErrorManager.getDefault().notify(ioe);
 *     // or use logging
 *     Logger.getLogger(YourClass.class.getName()).log(Level.SEVERE, null, ioe);
 * }
 * </pre>
 * </dd>
 *
 * <dt>Provide a user-visible (localized) message</dt>
 * <dd>
 * <pre>
 * public void doSomething(File f) throws IOException {
 *     if (!f.isFile()) {
 *         IOException e = new IOException("Not a file: " + f); // NOI18N
 *         // For what the user actually sees:
 *         ErrorManager.getDefault().annotate(e,
 *             NbBundle.getMessage(This.class, "EXC_not_a_file", f));
 *         throw e;
 *     }
 * }
 * </pre>
 * <p>You can also add the message when the exception is caught rather
 * than when it is thrown. You could even have one piece of code throw
 * an exception, another annotate it, and yet another notify it.
 * </dd>
 *
 * <dt>Collecting several exceptions and wrapping them in one</dt>
 * <dd>
 * <pre>
 * IOException all = null;
 * for (int i = 0; i &lt; things.length; i++) {
 *     try {
 *          things[i].process();
 *     } catch (ThingProcessingException e) {
 *          if (all == null) {
 *              all = new IOException("Could not process one or more things"); // NOI18N
 *          }
 *          ErrorManager.getDefault().annotate(all, e);
 *     }
 * }
 * if (all != null) {
 *     throw all;
 * }
 * </pre>
 * <dd>
 *
 * <dt>Logging a warning message just simply uses the JDK's logging API</dt>
 * <dd>
 * <pre>
 * public void doSomething(String arg) {
 *     if (arg.length() == 0) {
 *         Logger.getLogger(YourClass.class.getName()).log(Leverl.WARNING,
 *             "Warning: doSomething called on empty string");
 *         return;
 *     }
 *     // ...
 * }
 * </pre>
 * </dd>
 *
 * <dt>Logging messages for some subcomponent can be done easily with JDK's logging API</dt>
 * <dd>
 * <pre>
 * package org.netbeans.modules.foo;
 * class FooModule {
 *     public static final Logger ERR =
 *         Logger.getLogger("org.netbeans.modules.foo");
 * }
 * // ...
 * class Something {
 *     public void doSomething(String arg) {
 *         LogRecord rec = new LogRecord(Level.FINE, "MSG_Key");
 *         // where in the Bundle.properties one has:
 *         // MSG_Key=Called doSomething with arg {0}
 *         rec.setResourceBundle(NbBundle.getBundle(Something.class));
 *         rec.setParameters(new Object[] { arg });
 *         ERR.log(rec);
 *     }
 * }
 * </pre>
 * </dd>
 *
 * </dl>
 * </div>
 * @author Jaroslav Tulach, Jesse Glick
 */
public abstract class ErrorManager extends Object {
    // XXX deprecate error manager after phase II and III are done. See:
    // http://openide.netbeans.org/tutorial/reviews/opinions_35067.html

    /**
     * Undefined severity.
     * May be used only in {@link #notify(int, Throwable)}
     * and {@link #annotate(Throwable, int, String, String, Throwable, Date)}.
     */
    public static final int UNKNOWN = 0x00000000;

    /** Message that would be useful for tracing events but which need not be a problem. */
    public static final int INFORMATIONAL = 0x00000001;

    /** Something went wrong in the software, but it is continuing and the user need not be bothered. */
    public static final int WARNING = 0x00000010;

    /** Something the user should be aware of. */
    public static final int USER = 0x00000100;

    /** Something went wrong, though it can be recovered. */
    public static final int EXCEPTION = 0x00001000;

    /** Serious problem, application may be crippled. */
    public static final int ERROR = 0x00010000;

    /** We keep a reference to our proxy ErrorManager here. */
    private static DelegatingErrorManager current;

    /** Getter for the default version of error manager.
     * @return the error manager installed in the system
     * @since 2.1
     */
    public static ErrorManager getDefault() {
        synchronized (ErrorManager.class) {
            if (current != null) {
                return current;
            }
        }

        return getDefaultDelegate();
    }

    private static DelegatingErrorManager getDefaultDelegate() {
        DelegatingErrorManager c = new DelegatingErrorManager(""); // NOI18N

        try {
            c.initialize();

            synchronized (ErrorManager.class) {
                if (current == null) {
                    current = c;

                    // r is not null after c.initialize();
                    current.r.addLookupListener(current);
                }
            }
        } catch (RuntimeException e) {
            // #20467
            e.printStackTrace();
            current = c;
        } catch (LinkageError e) {
            // #20467
            e.printStackTrace();
            current = c;
        }

        return current;
    }

    /** Associates annotations with an exception.
    *
    * @param t the exception
    * @param arr array of annotations (or <code>null</code>)
    * @return the same exception <code>t</code> (as a convenience)
    */
    public abstract Throwable attachAnnotations(Throwable t, Annotation[] arr);

    /** Finds annotations associated with a given exception.
    * @param t the exception
    * @return array of annotations or <code>null</code>
    */
    public abstract Annotation[] findAnnotations(Throwable t);

    /** Annotates given exception with given values. All the
    * previous annotations are kept and this new one is added at
    * the top of the annotation stack (index 0 of the annotation
    * array).
    *
    * @param t the exception
    * @param severity integer describing severity, e.g. {@link #EXCEPTION}
    * @param message message to attach to the exception or <code>null</code>
    * @param localizedMessage localized message for the user or <code>null</code>
    * @param stackTrace exception representing the stack trace or <code>null</code>
    * @param date date or <code>null</code>
    * @return the same exception <code>t</code> (as a convenience)
    */
    public abstract Throwable annotate(
        Throwable t, int severity, String message, String localizedMessage, Throwable stackTrace, java.util.Date date
    );

    /** Prints the exception to the log file and (possibly) notifies the user.
     * Use of {@link #UNKNOWN} severity means that the error manager should automatically
     * select an appropriate severity level, for example based on the contents of
     * annotations in the throwable.
    * @param severity the severity to be applied to the exception (overrides default), e.g. {@link #EXCEPTION}
    * @param t the exception to notify
    */
    public abstract void notify(int severity, Throwable t);

    /** Prints the exception to the log file and (possibly) notifies the user.
     * Guesses at the severity.
    * @param t the exception to notify
     * @see #UNKNOWN
     * @see #notify(int, Throwable)
    */
    public final void notify(Throwable t) {
        notify(UNKNOWN, t);
    }

    /** Logs the message to a file and (possibly) tells the user.
    * @param severity the severity to be applied (overrides default)
    * @param s the log message
    */
    public abstract void log(int severity, String s);
    // not yet: after phase III: * @deprecated use {@link Logger#log}

    /** Logs the message to log file and (possibly) tells the user.
     * Uses a default severity.
    * @param s the log message
    */
    public final void log(String s) {
    // not yet: after phase III: * @deprecated {@link Logger#log}
        log(INFORMATIONAL, s);
    }

    /** Test whether a messages with given severity will be logged in advance.
     * Can be used to avoid the construction of complicated and expensive
     * logging messages.
     * <p>The default implementation just returns true. Subclasses
     * should override to be more precise - <strong>treat this method as abstract</strong>.
     * @param severity the severity to check, e.g. {@link #EXCEPTION}
     * @return <code>false</code> if the next call to {@link #log(int,String)} with this severity will
     *    discard the message
     */
    public boolean isLoggable(int severity) {
     // not yet: after phase III: * @deprecated Use {@link Logger#isLoggable}
        return true;
    }

    /**
     * Test whether a throwable, if {@link #notify(int, Throwable) notified} at the given
     * level, will actually be displayed in any way (even to a log file etc.).
     * If not, there is no point in constructing it.
     * <p>This method is distinct from {@link #isLoggable} because an error manager
     * implementation may choose to notify stack traces at a level where it would
     * not log messages. See issue #24056 for justification.
     * <p>The default implementation just calls {@link #isLoggable}. Subclasses
     * should override to be more precise - <strong>treat this method as abstract</strong>.
     * @param severity a notification severity
     * @return true if a throwable notified at this severity will be used; false if it will be ignored
     * @since 3.18
     */
    public boolean isNotifiable(int severity) {
        return isLoggable(severity);
    }

    /** Returns an instance with given name.
     * <p>By convention, you can name error managers the same as packages (or classes)
     * they are designed to report information from.
     * For example, <code>org.netbeans.modules.mymodule.ComplicatedParser</code>.
     * <p>The error manager implementation should provide some way of configuring e.g.
     * the logging level for error managers of different names. For example, in the basic
     * NetBeans core implementation, you can define a system property with the same name
     * as the future error manager (or a package prefix of it) whose value is the numeric
     * logging level (e.g. <samp>-J-Dorg.netbeans.modules.mymodule.ComplicatedParser=0</samp>
     * to log everything). Other implementations may have quite different ways of configuring
     * the error managers.
     * @param name the desired identifying name
     * @return a new error manager keyed off of that name
     */
    public abstract ErrorManager getInstance(String name);

    //
    // Helper methods
    //

    /** Annotates given exception with given values. All the
    * previous annotations are kept and this new is added at
    * the top of the annotation stack (index 0 of the annotation
    * array).
    *
    * @param t the exception
    * @param localizedMessage localized message for the user or null
    * @return the same exception <code>t</code> (as a convenience)
    */
    public final Throwable annotate(Throwable t, String localizedMessage) {
        return annotate(t, UNKNOWN, null, localizedMessage, null, null);
    }

    /** Annotates target exception with given exception. All the
    * previous annotations are kept and this new is added at
    * the top of the annotation stack (index 0 of the annotation
    * array).
     * <p>Consider using {@link Throwable#initCause} instead; this
     * will be correctly reported by the NetBeans error manager, and
     * also works properly with {@link Throwable#printStackTrace()}.
    * @param target the exception to be annotated
    * @param t the exception that will be added
    * @return the same exception <code>target</code> (as a convenience)
    */
    public final Throwable annotate(Throwable target, Throwable t) {
        return annotate(target, UNKNOWN, null, null, t, null);
    }

    /** Takes annotations from one exception and associates
    * them with another one.
    *
    * @param t the exception to annotate
    * @param copyFrom exception to take annotations from
    * @return the same exception <code>t</code> (as a convenience)
    * @deprecated Now does the same thing as {@link #annotate(Throwable,Throwable)}
    *             except marks the annotation {@link #UNKNOWN} severity. Otherwise
    *             you used to have inadvertent data loss when <code>copyFrom</code>
    *             had annotations of its own: the subannotations were kept but the
    *             main stack trace in <code>copyFrom</code> was discarded. In practice
    *             you usually want to keep all of <code>copyFrom</code>; if for some
    *             reason you just want to keep annotations, please do so explicitly
    *             using {@link #findAnnotations} and {@link #attachAnnotations}.
    */
    @Deprecated
    public final Throwable copyAnnotation(Throwable t, Throwable copyFrom) {
        // Cf. #17874 for the change in behavior.

        /*
        Annotation[] arr = findAnnotations (copyFrom);

        if (arr != null) {
            return attachAnnotations (
                       t, arr
                   );
        } else {
        */
        return annotate(t, UNKNOWN, null, null, copyFrom, null);

        /*
        }
        */
    }

    /** Annotation that can be attached to an error.
    */
    public static interface Annotation {
        /** Non-localized message.
        * @return associated message or <code>null</code>
        */
        public abstract String getMessage();

        /** Localized message.
        * @return message to be presented to the user or <code>null</code>
        */
        public abstract String getLocalizedMessage();

        /** Stack trace. The stack trace should locate the method
        * and position in the method where the error occurred.
        *
        * @return exception representing the location of the error or <code>null</code>
        */
        public abstract Throwable getStackTrace();

        /** Time at which the exception occurred.
        * @return the time or <code>null</code>
        */
        public abstract java.util.Date getDate();

        /** Severity of the exception.
         * {@link #UNKNOWN} serves as the default.
        * @return number representing the severity, e.g. {@link ErrorManager#EXCEPTION}
        */
        public abstract int getSeverity();
    }
     // end of Annotation

    /**
     * Implementation of ErrorManager that delegates to the ones found by
     * lookup.
     */
    private static class DelegatingErrorManager extends ErrorManager implements LookupListener {
        private String name = null;

        /**
         * The set of instances we delegate to.
         */
        private Set<ErrorManager> delegates = new HashSet<ErrorManager>();
        
        /** fallback logger to send messages to */
        private Logger logger;

        /**
         * A set that has to be updated when the list of delegates
         * changes. All instances created by getInstance are held here.
         */
        private WeakSet<DelegatingErrorManager> createdByMe = new WeakSet<DelegatingErrorManager>();

        /** If we are the "central" delagate this is not null and
         * we listen on the result. On newly created delegates this
         * is null.
         */
        Lookup.Result<ErrorManager> r;

        public DelegatingErrorManager(String name) {
            this.name = name;
        }
        
        /** Initializes the logger.
         */
        Logger logger() {
            if (logger == null) {
                logger = Logger.getLogger(this.name);
            }
            return logger;
        }

        /** If the name is not empty creates new instance of
         * DelegatingErrorManager. Adds it to createdByMe.
         */
        public ErrorManager getInstance(String name) {
            if ((name == null) || ("".equals(name))) { // NOI18N

                return this;
            }

            DelegatingErrorManager dem = new DelegatingErrorManager(name);

            synchronized (this) {
                attachNewDelegates(dem, name);
                createdByMe.add(dem);
            }

            return dem;
        }

        /** Calls all delegates. */
        public Throwable attachAnnotations(Throwable t, Annotation[] arr) {
            for (ErrorManager em : delegates) {
                em.attachAnnotations(t, arr);
            }

            return t;
        }

        /** Calls all delegates. */
        public Annotation[] findAnnotations(Throwable t) {
            for (ErrorManager em : delegates) {
                Annotation[] res = em.findAnnotations(t);

                if ((res != null) && (res.length > 0)) {
                    return res;
                }
            }

            return new Annotation[0];
        }

        /** Calls all delegates. */
        public Throwable annotate(
            Throwable t, int severity, String message, final String localizedMessage, Throwable stackTrace,
            java.util.Date date
        ) {
            if (delegates.isEmpty()) {
                LogRecord rec = new LogRecord(convertSeverity(severity, true, Level.ALL), message);
                if (stackTrace != null) {
                    rec.setThrown(stackTrace);
                }
                if (date != null) {
                    rec.setMillis(date.getTime());
                }
                if (localizedMessage != null) {
                    ResourceBundle rb = new ResourceBundle() {
                        public Object handleGetObject(String key) {
                            if ("msg".equals(key)) { // NOI18N
                                return localizedMessage;
                            } else {
                                return null;
                            }
                        }
                        
                        public Enumeration<String> getKeys() {
                            return Enumerations.singleton("msg"); // NOI18N
                        }
                    };
                    rec.setResourceBundle(rb);
                    rec.setMessage("msg"); // NOI18N
                }
                
                AnnException ann = AnnException.findOrCreate(t, true);
                ann.addRecord(rec);
                
                return t;
            }
            
            for (ErrorManager em : delegates) {
                em.annotate(t, severity, message, localizedMessage, stackTrace, date);
            }

            return t;
        }

        /** Calls all delegates. */
        public void notify(int severity, Throwable t) {
            if (delegates.isEmpty()) {
                if (enterLogger()) return;
                try {
                    AnnException ext = AnnException.extras.get(t);
                    if (ext != null) {
                        t = ext;
                    }
                    logger().log(convertSeverity(severity, true, OwnLevel.UNKNOWN), t.getMessage(), t);
                } finally {
                    exitLogger();
                }
                return;
            }

            try {
                for (ErrorManager em : delegates) {
                    em.notify(severity, t);
                }
            } catch (RuntimeException e) {
                // #20467
                e.printStackTrace();
                t.printStackTrace();
            } catch (LinkageError e) {
                // #20467
                e.printStackTrace();
                t.printStackTrace();
            }
        }

        /** Calls all delegates. */
        public void log(int severity, String s) {
            if (severity == UNKNOWN) {
                throw new IllegalArgumentException("ErrorManager.log(UNKNOWN, ...) is not permitted"); // NOI18N
            }

            if (delegates.isEmpty()) {
                Level sev = convertSeverity(severity, false, Level.FINE);
                if (enterLogger()) return;
                try {
                    logger().log(sev, s);
                } finally {
                    exitLogger();
                }
                return;
            }

            for (ErrorManager em : delegates) {
                em.log(severity, s);
            }
        }

        private static Level convertSeverity(final int severity, boolean forException, Level def) {
            Level sev = def;

            if (severity >= ERROR) {
                sev = Level.SEVERE;
            } else if (severity >= EXCEPTION) {
                sev = Level.SEVERE;
            } else if (severity >= USER) {
                sev = OwnLevel.USER;
            } else if (severity >= WARNING) {
                sev = Level.WARNING;
            } else if (severity >= INFORMATIONAL) {
                sev = forException ? Level.INFO: Level.FINE;
            }
            return sev;
        }

        /** Calls all delegates. */
        public boolean isLoggable(int severity) {
            if (severity == UNKNOWN) {
                throw new IllegalArgumentException("ErrorManager.isLoggable(UNKNOWN) is not permitted"); // NOI18N
            }

            if (delegates.isEmpty()) {
                return logger().isLoggable(convertSeverity(severity, false, null));
            }

            for (ErrorManager em : delegates) {
                if (em.isLoggable(severity)) {
                    return true;
                }
            }

            return false;
        }

        /** Calls all delegates. */
        public boolean isNotifiable(int severity) {
            if (severity == UNKNOWN) {
                throw new IllegalArgumentException("ErrorManager.isNotifiable(UNKNOWN) is not permitted"); // NOI18N
            }

            if (delegates.isEmpty()) {
                return logger().isLoggable(convertSeverity(severity, true, null));
            }

            for (ErrorManager em : delegates) {
                if (em.isNotifiable(severity)) {
                    return true;
                }
            }

            return false;
        }

        /**
         * Updates the list of delegates. Also updates all instances created
         * by ourselves.
         */
        public synchronized void setDelegates(Collection<? extends ErrorManager> newDelegates) {
            delegates = new LinkedHashSet<ErrorManager>(newDelegates);

            for (DelegatingErrorManager dem : createdByMe) {
                attachNewDelegates(dem, dem.getName());
            }
        }

        private String getName() {
            return name;
        }

        /**
         * Takes all our delegates, asks them for an instance identified by
         * name and adds those results as new delegates for dem.
         * @param String name
         * @param DelagatingErrorManager d the instance to which we will attach
         */
        private void attachNewDelegates(DelegatingErrorManager dem, String name) {
            Set<ErrorManager> newDelegatesForDem = new HashSet<ErrorManager>();

            for (ErrorManager e : delegates) {
                newDelegatesForDem.add(e.getInstance(name));
            }

            dem.setDelegates(newDelegatesForDem);
        }

        /** Blocks on lookup and after the lookup returns updates
         * delegates and adds a listener.
         */
        public void initialize() {
            r = Lookup.getDefault().lookupResult(ErrorManager.class);
            setDelegates(r.allInstances());
        }

        /** Updates the delegates.*/
        public void resultChanged(LookupEvent ev) {
            if (r != null) {
                setDelegates(r.allInstances());
            }
        }

        private static volatile Thread lastThread;
        private static boolean enterLogger() {
            if (lastThread == Thread.currentThread()) {
                new Exception("using error manager from inside a logger").printStackTrace(); // NOI18N
                return true;
            }
            lastThread = Thread.currentThread();
            return false;
        }

        private static void exitLogger() {
            lastThread = null;
        }
    }
    
    /** An exception that has a log record associated with itself, so
     * the NbErrorManager can extract info about the annotation.
     */
    private static final class AnnException extends Exception implements Callable<LogRecord[]> {
        private List<LogRecord> records;
        /** additional mapping from throwables that refuse initCause call */
        private static Map<Throwable, AnnException> extras = new WeakHashMap<Throwable, AnnException>();

        public String getMessage() {
            StringBuilder sb = new StringBuilder();
            String sep = "";
            for (LogRecord r : records) {
                if (r.getMessage() != null) {
                    sb.append(sep);
                    sb.append(r.getMessage());
                    sep = "\n";
                }
            }
            return sb.toString();
        }

        static AnnException findOrCreate(Throwable t, boolean create) {
            if (t instanceof AnnException) {
                return (AnnException)t;
            }
            if (t.getCause() == null) {
                if (create) {
                    try {
                        t.initCause(new AnnException());
                    } catch (IllegalStateException x) {
                        AnnException ann = extras.get(t);
                        if (ann == null) {
                            ann = new AnnException();
                            ann.initCause(t);
                            Logger.getLogger(ErrorManager.class.getName()).log(Level.FINE, "getCause was null yet initCause failed for " + t, x);
                            extras.put(t, ann);
                        }
                        return ann;
                    }
                }
                return (AnnException)t.getCause();
            }
            return findOrCreate(t.getCause(), create);
        }

        private AnnException() {
        }

        public synchronized void addRecord(LogRecord rec) {
            if (records == null) {
                records = new ArrayList<LogRecord>();
            }
            records.add(rec);
        }

        public LogRecord[] call() {
            List<LogRecord> r = records;
            LogRecord[] empty = new LogRecord[0];
            return r == null ? empty : r.toArray(empty);
        }

        public void printStackTrace(PrintStream s) {
            super.printStackTrace(s);
            logRecords(s);
        }

        public void printStackTrace(PrintWriter s) {
            super.printStackTrace(s);
            logRecords(s);
        }

        public void printStackTrace() {
            printStackTrace(System.err);
        }

        private void logRecords(Appendable a) {
            List<LogRecord> r = records;
            if (r == null) {
                return;
            }
            try {

                for (LogRecord log : r) {
                    if (log.getMessage() != null) {
                        a.append(log.getMessage()).append("\n");;
                    }
                    if (log.getThrown() != null) {
                        StringWriter w = new StringWriter();
                        log.getThrown().printStackTrace(new PrintWriter(w));
                        a.append(w.toString()).append("\n");
                    }
                }
            } catch (IOException ex) {
                ex.printStackTrace();
            }
        }
    } // end AnnException

    private static final class OwnLevel extends Level {
        public static final Level USER = new OwnLevel("USER", 1973); // NOI18N
        public static final Level UNKNOWN = new OwnLevel("SEVERE", Level.SEVERE.intValue() + 1); // NOI18N

        private OwnLevel(String s, int i) {
            super(s, i);
        }
    } // end of UserLevel
}
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