--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/com/go/trove/log/LogEventParsingWriter.java	Sat Mar 21 11:00:06 2009 +0000
@@ -0,0 +1,226 @@
+/* ====================================================================
+ * Trove - Copyright (c) 1997-2000 Walt Disney Internet Group
+ * ====================================================================
+ * The Tea Software License, Version 1.1
+ *
+ * Copyright (c) 2000 Walt Disney Internet Group. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * 3. The end-user documentation included with the redistribution,
+ *    if any, must include the following acknowledgment:
+ *       "This product includes software developed by the
+ *        Walt Disney Internet Group (http://opensource.go.com/)."
+ *    Alternately, this acknowledgment may appear in the software itself,
+ *    if and wherever such third-party acknowledgments normally appear.
+ *
+ * 4. The names "Tea", "TeaServlet", "Kettle", "Trove" and "BeanDoc" must
+ *    not be used to endorse or promote products derived from this
+ *    software without prior written permission. For written
+ *    permission, please contact opensource@dig.com.
+ *
+ * 5. Products derived from this software may not be called "Tea",
+ *    "TeaServlet", "Kettle" or "Trove", nor may "Tea", "TeaServlet",
+ *    "Kettle", "Trove" or "BeanDoc" appear in their name, without prior
+ *    written permission of the Walt Disney Internet Group.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE WALT DISNEY INTERNET GROUP OR ITS
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ * ====================================================================
+ *
+ * For more information about Tea, please see http://opensource.go.com/.
+ */
+
+package com.go.trove.log;
+
+import java.io.*;
+import java.util.*;
+
+/******************************************************************************
+ * LogEventParsingWriter parses the data written to it and converts it
+ * to LogEvent objects. Add a LogListener to intercept LogEvents. Events are
+ * parsed based on newline characters (LF, CRLF or CR) or a switch to a
+ * different thread.
+ * 
+ * @author Brian S O'Neill
+ * @version
+ * <!--$$Revision: 1.1 $-->, <!--$$JustDate:-->  9/07/00 <!-- $-->
+ */
+public class LogEventParsingWriter extends Writer {
+    private Vector mListeners;
+    private Log mSource;
+    private int mType;
+
+    private CharArrayWriter mMessageBuffer;
+    private Thread mMessageThread;
+
+    private Date mTimestamp;
+
+    // Set to true upon reading a CR so that if the next character is a LF,
+    // it is consumed. This is how CRLF patterns are discovered.
+    private boolean mTrackLF;
+
+    /**
+     * @param source Source object to create events with.
+     * @param type Type of events to create.
+     */
+    public LogEventParsingWriter(Log source, int type) {
+        mListeners = new Vector(2);
+        mSource = source;
+        mType = type;
+
+        mMessageBuffer = new CharArrayWriter();
+    }
+
+    /**
+     * @param source Source object to create events with.
+     * @param type Type of events to create.
+     * @param lock Synchronization lock.
+     */
+    public LogEventParsingWriter(Log source, int type, Object lock) {
+        super(lock);
+        mListeners = new Vector(2);
+        mSource = source;
+        mType = type;
+
+        mMessageBuffer = new CharArrayWriter();
+    }
+
+    public void addLogListener(LogListener listener) {
+        mListeners.addElement(listener);
+    }
+
+    public void removeLogListener(LogListener listener) {
+        mListeners.removeElement(listener);
+    }
+
+    private void flushLogEvent() {
+        synchronized (lock) {
+            if (mMessageThread == null) {
+                return;
+            }
+            
+            String message = mMessageBuffer.toString();
+            
+            if (mMessageBuffer.size() > 10000) {
+                mMessageBuffer = new CharArrayWriter();
+            }
+            else {
+                mMessageBuffer.reset();
+            }
+
+            LogEvent e;
+            if (mTimestamp == null) {
+                e = new LogEvent(mSource, mType, message, mMessageThread);
+            }
+            else {
+                e = new LogEvent(mSource, mType, message, mMessageThread, 
+                                 mTimestamp);
+                mTimestamp = null;
+            }
+            
+            synchronized (mListeners) {
+                Enumeration group = mListeners.elements();
+                while (group.hasMoreElements()) {
+                    ((LogListener)group.nextElement()).logMessage(e);
+                }
+            }
+        }
+    }
+
+    public void write(char[] array, int off, int len) throws IOException {
+        synchronized (lock) {
+            if (!isEnabled()) {
+                if (mMessageBuffer.size() > 0) {
+                    flushLogEvent();
+                }
+                return;
+            }
+
+            Thread current = Thread.currentThread();
+            if (current != mMessageThread) {
+                if (mMessageBuffer.size() > 0) {
+                    flushLogEvent();
+                }
+                mMessageThread = current;
+            }
+            
+            int writtenLength = 0;
+            
+            int i = 0;
+            for (i=0; i<len; i++) {
+                char c = array[i + off];
+                if (c == '\r') {
+                    mTrackLF = true;
+                    writeToBuffer(array, writtenLength + off, 
+                                  i - writtenLength);
+                    // Add one more than i to skip the CR.
+                    writtenLength = i + 1;
+                    flushLogEvent();
+                }
+                else if (c == '\n') {
+                    if (mTrackLF) {
+                        // Consume the LF of CRLF.
+                        mTrackLF = false;
+                        writtenLength++;
+                    }
+                    else {
+                        writeToBuffer(array, writtenLength + off, 
+                                      i - writtenLength);
+                        // Add one more than i to skip the LF.
+                        writtenLength = i + 1;
+                        flushLogEvent();
+                    }
+                }
+                else {
+                    mTrackLF = false;
+                }
+            }
+            
+            writeToBuffer(array, writtenLength + off, i - writtenLength);
+        }
+    }
+
+    public void flush() throws IOException {
+    }
+
+    public void close() throws IOException {
+        synchronized (lock) {
+            mMessageBuffer.close();
+        }
+    }
+
+    /**
+     * Returning false discards written data, and events are not generated. 
+     * Default implementation always returns true. 
+     */
+    public boolean isEnabled() {
+        return true;
+    }
+
+    private void writeToBuffer(char[] array, int off, int len) {
+        if (mMessageBuffer.size() == 0) {
+            mTimestamp = new Date();
+        }
+        mMessageBuffer.write(array, off, len);
+    }
+}