/*

package com.nokia.ant;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.OutputStream;

import java.io.OutputStreamWriter;

import java.io.PrintStream;

import java.io.Writer;

import java.util.Hashtable;

import java.util.Stack;

import javax.xml.parsers.DocumentBuilder;

import javax.xml.parsers.DocumentBuilderFactory;

import javax.xml.parsers.ParserConfigurationException;

import org.apache.tools.ant.util.DOMElementWriter;

import org.apache.tools.ant.util.StringUtils;

import org.w3c.dom.Document;

import org.w3c.dom.Element;

import org.w3c.dom.Text;

/**

 */

public class XmlLogger implements BuildLogger {

    /** XML element name for a build. */

    private static final String BUILD_TAG = "build";

    /** XML element name for a message. */

    private static final String MESSAGE_TAG = "message";

    /** XML attribute name for a time. */

    private static final String TIME_ATTR = "time";

    /** XML attribute name for a message priority. */

    private static final String PRIORITY_ATTR = "priority";

    /** XML attribute name for an error description. */

    private static final String ERROR_ATTR = "error";

    /** XML element name for a stack trace. */

    private static final String STACKTRACE_TAG = "stacktrace";

    /** DocumentBuilder to use when creating the document to start with. */

    private static DocumentBuilder builder = getDocumentBuilder();

    private int msgOutputLevel = Project.MSG_ERR;

    private PrintStream outStream;

    /** The complete log document for this build. */

    private Document doc = builder.newDocument();

    /** Mapping for when tasks started (Task to TimedElement). */

    private Hashtable tasks = new Hashtable();

    /** Mapping for when targets started (Task to TimedElement). */

    private Hashtable targets = new Hashtable();

    /**

     */

    private Hashtable<Thread, Stack> threadStacks = new Hashtable<Thread, Stack>();

    /**

     * When the build started.

     */

    private TimedElement buildElement;

    /**

     * @return a default DocumentBuilder instance.

     */

    private static DocumentBuilder getDocumentBuilder() {

        try {

            return DocumentBuilderFactory.newInstance().newDocumentBuilder();

            throw new ExceptionInInitializerError(exc.getMessage());

        }

    }

    /** Utility class representing the time an element started. */

    private static class TimedElement {

        /**

         */

        private long startTime;

        /** Element created at the start time. */

        private Element element;

        public String toString() {

            return element.getTagName() + ":" + element.getAttribute("name");

        }

    }

    /**

     * @param event Ignored.

     */

    public void buildStarted(BuildEvent event) {

        buildElement = new TimedElement();

        buildElement.startTime = System.currentTimeMillis();

        buildElement.element = doc.createElement(BUILD_TAG);

    }

    /**

     */

    public void buildFinished(BuildEvent event) {

        long totalTime = System.currentTimeMillis() - buildElement.startTime;

        if (event.getException() != null) {

            // print the stacktrace in the build file it is always useful...

            // better have too much info than not enough.

            Throwable exception = event.getException();

            Text errText = doc.createCDATASection(StringUtils.getStackTrace(exception));

            Element stacktrace = doc.createElement(STACKTRACE_TAG);

            stacktrace.appendChild(errText);

            buildElement.element.appendChild(stacktrace);

        }

        String outFilename = event.getProject().getProperty("XmlLogger.file");

        if (outFilename == null) {

            outFilename = "log.xml";

        }

        if (xslUri == null) {

            xslUri = "log.xsl";

        }

        Writer out = null;

        try {

            // specify output in UTF8 otherwise accented characters will blow

            // up everything

            OutputStream stream = outStream;

            if (stream == null) {

                stream = new FileOutputStream(outFilename);

            }

            out = new OutputStreamWriter(stream, "UTF8");

            out.write("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n");

            if (xslUri.length() > 0) {

            }

            (new DOMElementWriter()).write(buildElement.element, out, 0, "\t");

            out.flush();

            throw new BuildException("Unable to write log file" + exc.getMessage());

            if (out != null) {

                try {

                    out.close();

                    // We are Ignoring the errors as no need to fail the build.

                    event.getProject().log("Not able to close the file handler " + e.getMessage(), Project.MSG_WARN);

                    e = null; // ignore

                }

            }

        }

        buildElement = null;

    }

    /**

     */

    public void targetStarted(BuildEvent event) {

    }

    /**

     */

    public void targetFinished(BuildEvent event) {

    }

    /**

     */

    public void taskStarted(BuildEvent event) {

    }

    /**

     */

    public void taskFinished(BuildEvent event) {

    }

    /**

     * Get the TimedElement associated with a task.

     */

    private TimedElement getTaskElement(Task task) {

        TimedElement element = (TimedElement) tasks.get(task);

        if (element != null) {

            return element;

        }

        for (Enumeration taskEnum = tasks.keys(); taskEnum.hasMoreElements();) {

            Task key = (Task) taskEnum.nextElement();

            if (key instanceof UnknownElement) {

                if (((UnknownElement) key).getTask() == task) {

                    return (TimedElement) tasks.get(key);

                }

            }

        }

        return null;

    }

    /**

     */

    public void messageLogged(BuildEvent event) {

        int priority = event.getPriority();

        if (priority > msgOutputLevel) {

            return;

        }

        Element messageElement = doc.createElement(MESSAGE_TAG);

        String name = "debug";

        switch (event.getPriority()) {

            case Project.MSG_ERR:

                name = "error";

                break;

            case Project.MSG_WARN:

                name = "warn";

                break;

            case Project.MSG_INFO:

                name = "info";

                break;

            default:

                name = "debug";

                break;

        }

        messageElement.setAttribute(PRIORITY_ATTR, name);

        Throwable ex = event.getException();

        if (Project.MSG_DEBUG <= msgOutputLevel && ex != null) {

            Text errText = doc.createCDATASection(StringUtils.getStackTrace(ex));

            Element stacktrace = doc.createElement(STACKTRACE_TAG);

            stacktrace.appendChild(errText);

            buildElement.element.appendChild(stacktrace);

        }

        Text messageText = doc.createCDATASection(event.getMessage());

        messageElement.appendChild(messageText);

        TimedElement parentElement = null;

        Task task = event.getTask();

        Target target = event.getTarget();

        if (task != null) {

            parentElement = getTaskElement(task);

        }

        if (parentElement == null && target != null) {

            parentElement = (TimedElement) targets.get(target);

        }

        /*

        if (parentElement != null) {

            parentElement.element.appendChild(messageElement);

            buildElement.element.appendChild(messageElement);

        }

    }

    // -------------------------------------------------- BuildLogger interface

    /**

     * Set the logging level when using this as a Logger

     *        class for level definitions

     */

    public void setMessageOutputLevel(int level) {

        msgOutputLevel = level;

    }

    /**

     * @param output the output PrintStream.

     */

    public void setOutputPrintStream(PrintStream output) {

        this.outStream = new PrintStream(output, true);

    }

    /**

     * Ignore emacs mode, as it has no meaning in XML format

     */

    public void setEmacsMode(boolean emacsMode) {

    }

    /**

     * @param err the stream we are going to ignore.

     */

    public void setErrorPrintStream(PrintStream err) {

    }

}