Index: lams_tool_chat/src/java/org/lamsfoundation/lams/tool/chat/model/Chat.java
===================================================================
RCS file: /usr/local/cvsroot/lams_tool_chat/src/java/org/lamsfoundation/lams/tool/chat/model/Chat.java,v
diff -u -r1.5 -r1.6
--- lams_tool_chat/src/java/org/lamsfoundation/lams/tool/chat/model/Chat.java	7 Jun 2006 01:53:04 -0000	1.5
+++ lams_tool_chat/src/java/org/lamsfoundation/lams/tool/chat/model/Chat.java	8 Jun 2006 02:09:01 -0000	1.6
@@ -35,8 +35,6 @@
 import org.lamsfoundation.lams.contentrepository.RepositoryCheckedException;
 import org.lamsfoundation.lams.contentrepository.client.IToolContentHandler;
 import org.lamsfoundation.lams.tool.chat.service.ChatService;
-import org.lamsfoundation.lams.usermanagement.dto.UserDTO;
-import org.lamsfoundation.lams.web.util.AttributeNames;
 
 /**
  * @hibernate.class table="tl_lachat11_chat"
@@ -71,6 +69,10 @@
 
 	private Boolean lockOnFinished;
 
+	private Boolean filteringEnabled;
+
+	private String filterKeywords;
+
 	private String onlineInstructions;
 
 	private String offlineInstructions;
@@ -97,6 +99,7 @@
 	/** full constructor */
 	public Chat(Date createDate, Date updateDate, Long createBy, String title,
 			String instructions, Boolean runOffline, Boolean lockOnFinished,
+			Boolean filteringEnabled, String filterKeywords,
 			String onlineInstructions, String offlineInstructions,
 			Boolean contentInUse, Boolean defineLater, Long toolContentId,
 			Set chatAttachments, Set chatSessions) {
@@ -107,6 +110,8 @@
 		this.instructions = instructions;
 		this.runOffline = runOffline;
 		this.lockOnFinished = lockOnFinished;
+		this.filteringEnabled = filteringEnabled;
+		this.filterKeywords = filterKeywords;
 		this.onlineInstructions = onlineInstructions;
 		this.offlineInstructions = offlineInstructions;
 		this.contentInUse = contentInUse;
@@ -317,6 +322,28 @@
 	}
 
 	/**
+	 * @hibernate.property column="filtering_enabled" length="1"
+	 */
+	public Boolean getFilteringEnabled() {
+		return filteringEnabled;
+	}
+
+	public void setFilteringEnabled(Boolean filteringEnabled) {
+		this.filteringEnabled = filteringEnabled;
+	}
+
+	/**
+	 * @hibernate.property column="filter_keywords" length="65535"
+	 */
+	public String getFilterKeywords() {
+		return filterKeywords;
+	}
+
+	public void setFilterKeywords(String filterKeywords) {
+		this.filterKeywords = filterKeywords;
+	}
+
+	/**
 	 * toString
 	 * 
 	 * @return String
@@ -380,13 +407,15 @@
 				Set set = new HashSet();
 				while (iter.hasNext()) {
 					ChatAttachment originalFile = (ChatAttachment) iter.next();
-					ChatAttachment newFile = (ChatAttachment) originalFile.clone();
-					if(toolContentHandler != null){
-						//duplicate file node in repository
-						NodeKey keys = toolContentHandler.copyFile(originalFile.getFileUuid());
+					ChatAttachment newFile = (ChatAttachment) originalFile
+							.clone();
+					if (toolContentHandler != null) {
+						// duplicate file node in repository
+						NodeKey keys = toolContentHandler.copyFile(originalFile
+								.getFileUuid());
 						newFile.setFileUuid(keys.getUuid());
 						newFile.setFileVersionId(keys.getVersion());
-  					}
+					}
 					set.add(newFile);
 				}
 				chat.chatAttachments = set;
Index: lams_tool_chat/src/java/org/lamsfoundation/lams/tool/chat/util/ChatMessageFilter.java
===================================================================
RCS file: /usr/local/cvsroot/lams_tool_chat/src/java/org/lamsfoundation/lams/tool/chat/util/ChatMessageFilter.java,v
diff -u
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ lams_tool_chat/src/java/org/lamsfoundation/lams/tool/chat/util/ChatMessageFilter.java	8 Jun 2006 02:17:19 -0000	1.1
@@ -0,0 +1,57 @@
+/****************************************************************
+ * Copyright (C) 2005 LAMS Foundation (http://lamsfoundation.org)
+ * =============================================================
+ * License Information: http://lamsfoundation.org/licensing/lams/2.0/
+ * 
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2.0 
+ * as published by the Free Software Foundation.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
+ * USA
+ * 
+ * http://www.gnu.org/licenses/gpl.txt
+ * ****************************************************************
+ */
+
+/* $Id$ */
+
+package org.lamsfoundation.lams.tool.chat.util;
+
+import java.util.regex.Pattern;
+
+import org.lamsfoundation.lams.tool.chat.model.Chat;
+
+public class ChatMessageFilter {
+
+	private Pattern pattern;
+
+	public ChatMessageFilter(Chat chat) {
+		this.pattern = null;
+		String regex = chat.getFilterKeywords();
+		if (regex != null) {
+			// constructing regex
+			regex = regex.replaceAll("[" + "\\(" + "\\)" + "\\[" + "\\]"
+					+ "\\{" + "\\}" + "\\\\" + "\\^" + "\\$" + "\\|" + "\\?"
+					+ "\\*" + "\\+" + "\\." + "]+", " ");
+			regex = regex.replaceAll("[\\s]+", " ");
+			regex = regex.trim();
+			regex = regex.replaceAll(" ", "|");
+
+			if (regex.length() != 0) {
+				this.pattern = Pattern.compile(regex);
+			}
+		}
+	}
+
+	public Pattern getPattern() {
+		return this.pattern;
+	}
+}