/* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements.  See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You under the Apache License, Version 2.0 * (the "License"); you may not use this file except in compliance with * the License.  You may obtain a copy of the License at *  *      http://www.apache.org/licenses/LICENSE-2.0 *  * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */package org.apache.log4j.chainsaw;import java.util.StringTokenizer;import org.apache.log4j.Level;import org.xml.sax.Attributes;import org.xml.sax.SAXException;import org.xml.sax.helpers.DefaultHandler;/** * A content handler for document containing Log4J events logged using the * XMLLayout class. It will create events and add them to a supplied model. * * @author <a href="mailto:oliver@puppycrawl.com">Oliver Burn</a> * @version 1.0 */class XMLFileHandler    extends DefaultHandler{    /** represents the event tag **/    private static final String TAG_EVENT = "log4j:event";    /** represents the message tag **/    private static final String TAG_MESSAGE = "log4j:message";    /** represents the ndc tag **/    private static final String TAG_NDC = "log4j:NDC";    /** represents the throwable tag **/    private static final String TAG_THROWABLE = "log4j:throwable";    /** represents the location info tag **/    private static final String TAG_LOCATION_INFO = "log4j:locationInfo";    /** where to put the events **/    private final MyTableModel mModel;    /** the number of events in the document **/    private int mNumEvents;    /** the time of the event **/    private long mTimeStamp;    /** the priority (level) of the event **/    private Level mLevel;    /** the category of the event **/    private String mCategoryName;    /** the NDC for the event **/    private String mNDC;    /** the thread for the event **/    private String mThreadName;    /** the msg for the event **/    private String mMessage;    /** the throwable details the event **/    private String[] mThrowableStrRep;    /** the location details for the event **/    private String mLocationDetails;    /** buffer for collecting text **/    private final StringBuffer mBuf = new StringBuffer();    /**     * Creates a new <code>XMLFileHandler</code> instance.     *     * @param aModel where to add the events     */    XMLFileHandler(MyTableModel aModel) {        mModel = aModel;    }    /** @see DefaultHandler **/    public void startDocument()        throws SAXException    {        mNumEvents = 0;    }    /** @see DefaultHandler **/    public void characters(char[] aChars, int aStart, int aLength) {        mBuf.append(String.valueOf(aChars, aStart, aLength));    }    /** @see DefaultHandler **/    public void endElement(String aNamespaceURI,                           String aLocalName,                           String aQName)    {        if (TAG_EVENT.equals(aQName)) {            addEvent();            resetData();        } else if (TAG_NDC.equals(aQName)) {            mNDC = mBuf.toString();        } else if (TAG_MESSAGE.equals(aQName)) {            mMessage = mBuf.toString();        } else if (TAG_THROWABLE.equals(aQName)) {            final StringTokenizer st =                new StringTokenizer(mBuf.toString(), "\n\t");            mThrowableStrRep = new String[st.countTokens()];            if (mThrowableStrRep.length > 0) {                mThrowableStrRep[0] = st.nextToken();                for (int i = 1; i < mThrowableStrRep.length; i++) {                    mThrowableStrRep[i] = "\t" + st.nextToken();                }            }        }    }    /** @see DefaultHandler **/    public void startElement(String aNamespaceURI,                             String aLocalName,                             String aQName,                             Attributes aAtts)    {        mBuf.setLength(0);        if (TAG_EVENT.equals(aQName)) {            mThreadName = aAtts.getValue("thread");            mTimeStamp = Long.parseLong(aAtts.getValue("timestamp"));            mCategoryName = aAtts.getValue("logger");            mLevel = Level.toLevel(aAtts.getValue("level"));        } else if (TAG_LOCATION_INFO.equals(aQName)) {            mLocationDetails = aAtts.getValue("class") + "."                + aAtts.getValue("method")                + "(" + aAtts.getValue("file") + ":" + aAtts.getValue("line")                + ")";        }    }    /** @return the number of events in the document **/    int getNumEvents() {        return mNumEvents;    }    ////////////////////////////////////////////////////////////////////////////    // Private methods    ////////////////////////////////////////////////////////////////////////////    /** Add an event to the model **/    private void addEvent() {        mModel.addEvent(new EventDetails(mTimeStamp,                                         mLevel,                                         mCategoryName,                                         mNDC,                                         mThreadName,                                         mMessage,                                         mThrowableStrRep,                                         mLocationDetails));        mNumEvents++;    }    /** Reset the data for an event **/    private void resetData() {        mTimeStamp = 0;        mLevel = null;        mCategoryName = null;        mNDC = null;        mThreadName = null;        mMessage = null;        mThrowableStrRep = null;        mLocationDetails = null;    }}