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Java/ZZLogger.java

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+/*   
+Main.java
+ *    
+ *    Copyright (c) 1999, 2000 Ted Nelson and Tuomas Lukka
+ *
+ *    You may use and distribute under the terms of either the GNU Lesser
+ *    General Public License, either version 2 of the license or,
+ *    at your choice, any later version. Alternatively, you may use and
+ *    distribute under the terms of the XPL.
+ *
+ *    See the LICENSE.lgpl and LICENSE.xpl files for the specific terms of 
+ *    the licenses.
+ *
+ *    This software 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 README
+ *    file for more details.
+ *
+ */
+/*
+ * Written by Antti-Juhani Kaijanaho and Tuomas Lukka.
+ */
+
+package org.gzigzag;
+import java.lang.reflect.*;
+import java.io.*;
+
+/** A static package for logging things into a file.
+ * Used for providing ZZ developers with debug output to help them
+ * solve crashes.
+ */
+
+public class ZZLogger {
+    public static PrintWriter logfile = null;
+
+    private static boolean syslog = false;
+
+    public static void tryInitSyslog() {
+        try {
+            SysLogger.init();
+        } catch (UnsatisfiedLinkError e) {
+            exc(e);
+            return;
+        }
+        syslog = true;
+    }
+
+    public static void exc(Throwable t, String s) {
+	log(""+s);
+	exc(t);
+    }
+
+    public static void exc(Throwable t) {
+	if(t instanceof InvocationTargetException) {
+	    Throwable t1 = ((InvocationTargetException)t).getTargetException();
+	    verblog("InvokeException content: ");
+	    exc(t1);
+	}
+        log(""+t);
+	t.printStackTrace();
+	if(logfile != null) {
+	    t.printStackTrace(logfile);
+	    logfile.flush();
+	}
+    }
+
+    public static void log(String s) {
+        System.err.println(s);
+        if (syslog) SysLogger.log(s);
+        filelog(s);
+    }
+
+    private static void filelog(String s) {
+        if (logfile != null) {
+            logfile.println(s);
+            logfile.flush();
+        }
+    }
+
+    public static void verblog(String s) {
+        if (syslog) SysLogger.verblog(s);
+    }
+}