comparison java/src/uk/ac/qmul/eecs/ccmi/utils/CCmIUncaughtExceptionHandler.java @ 0:9418ab7b7f3f

Initial import

+/*  
+ CCmI Editor - A Collaborative Cross-Modal Diagram Editing Tool
+  
+ Copyright (C) 2011  Queen Mary University of London (http://ccmi.eecs.qmul.ac.uk/)
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ 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, see <http://www.gnu.org/licenses/>.
+*/  
+
+package uk.ac.qmul.eecs.ccmi.utils;
+
+import java.io.IOException;
+import java.io.PrintWriter;
+import java.io.StringWriter;
+import java.io.Writer;
+import java.lang.Thread.UncaughtExceptionHandler;
+import java.util.logging.FileHandler;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+/**
+ * The UncaughtExceptionHandler for the CCmI Editor. It logs the occurred exception stack trace 
+ * on a file (errorN.log, where N is an integer number automatically assigned to avoid
+ * collision with other files of the same type) which is created in the same directory where
+ * the program is run. The exception stack trace will be in the format defined by the {@code XMLFormatter} class
+ * of the java.utli.logging package.
+ * 
+ * @see java.util.logging.XMLFormatter
+ */
+public class CCmIUncaughtExceptionHandler implements UncaughtExceptionHandler {
+	
+	@Override
+	public void uncaughtException(Thread thread, Throwable throwable) {
+		try{
+			Logger logger = Logger.getLogger("uncaught_exception");
+			logger.setLevel(Level.SEVERE);
+			FileHandler fileHandler = null;
+			try {
+				fileHandler = new FileHandler("error%u.log",true); 
+			} catch (IOException e) {
+				System.err.println(throwable.toString());
+				System.err.println();
+				System.err.println("Could not use error log file");
+				e.printStackTrace();
+				return;
+			}
+			fileHandler.setLevel(Level.SEVERE);
+			logger.addHandler(fileHandler);
+			StringBuilder builder = new StringBuilder(throwable.toString());
+			builder.append('\n');
+			final Writer result = new StringWriter();
+		    final PrintWriter printWriter = new PrintWriter(result);
+		    throwable.printStackTrace(printWriter);
+		    builder.append(result.toString());
+			logger.severe(builder.toString());
+			fileHandler.close();
+			throwable.printStackTrace();
+		}catch(Exception exception){
+			exception.printStackTrace();
+			System.exit(-1);
+		}
+	}
+}