fix incorrect interpretation of Level.OFF and Level.ALL in SLF4JPlatformLogger

Signed-off-by: Ceki Gulcu <ceki@qos.ch>

Author: ceki

slf4j-jdk-platform-logging/src/main/java/org/slf4j/jdk/platform/logging/SLF4JPlatformLogger.java

@@ -115,23 +115,39 @@ public void log(Level jplLevel, ResourceBundle bundle, String format, Object...
      * @param thrown
      * @param params
      */
-    private void log(Level jplLevel, ResourceBundle bundle, String msg, Throwable thrown, Object... params) {
-        if (jplLevel == Level.OFF)
-            return;
+    private void log(final Level jplLevel, final ResourceBundle bundle, final String msg, final Throwable thrown, final Object... params) {
 
-        if (jplLevel == Level.ALL) {
-            performLog(org.slf4j.event.Level.TRACE, bundle, msg, thrown, params);
-            return;
-        }
+        final Level jplLevelReduced = fixExtremeLevels(jplLevel);
 
-        org.slf4j.event.Level slf4jLevel = jplLevelToSLF4JLevel(jplLevel);
+        org.slf4j.event.Level slf4jLevel = jplLevelToSLF4JLevel(jplLevelReduced);
         boolean isEnabled = slf4jLogger.isEnabledForLevel(slf4jLevel);
 
         if (isEnabled) {
             performLog(slf4jLevel, bundle, msg, thrown, params);
         }
     }
 
+    /**
+     * <p>Level.OFF and Level.ALL levels are not supposed to be used when calling log printing methods.
+     * </p>
+     *
+     * <p>We compensate for such incorrect usage by transforming Level.OFF as Level.ERROR and
+     * Level.ALL as Level.TRACE.
+     * </p>
+     *
+     * @param jplLevel
+     * @return
+     */
+    private Level fixExtremeLevels(Level jplLevel) {
+        if (jplLevel == Level.OFF)
+            return  Level.ERROR;
+
+        if (jplLevel == Level.ALL)
+            return Level.TRACE;
+
+        return jplLevel;
+    }
+
     private void performLog(org.slf4j.event.Level slf4jLevel, ResourceBundle bundle, String msg, Throwable thrown, Object... params) {
         String message = getResourceStringOrMessage(bundle, msg);
         LoggingEventBuilder leb = slf4jLogger.makeLoggingEventBuilder(slf4jLevel);

slf4j-jdk-platform-logging/src/test/java/org/slf4j/jdk/platform/logging/test/SLF4JPlatformLoggingTest.java

@@ -118,5 +118,18 @@ public void throwTest() throws IOException {
         assertTrue(results.get(line++).contains(this.getClass().getName()));
     }
 
+    @Test
+    public void extremeLevels() throws IOException {
+        LoggerFinder finder = System.LoggerFinder.getLoggerFinder();
+        assertEquals(EXPECTED_FINDER_CLASS, finder.getClass().getName());
+        Logger systemLogger = finder.getLogger("extremeLevels", null);
+        systemLogger.log(Level.OFF, "hello");
+        systemLogger.log(Level.ALL, "world");
+
+        List<String> results = SPS.stringList;
+        assertEquals(1, results.size());
+        assertEquals("ERROR extremeLevels - hello", results.get(0));
+
+    }
 
 }