1 files changed, 150 insertions, 0 deletions
diff --git a/core/java/com/android/internal/logging/AndroidHandler.java b/core/java/com/android/internal/logging/AndroidHandler.java
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+++ b/core/java/com/android/internal/logging/AndroidHandler.java
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+/*
+ * Copyright (C) 2008 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.internal.logging;
+
+import android.util.Log;
+
+import java.util.logging.Formatter;
+import java.util.logging.Handler;
+import java.util.logging.Level;
+import java.util.logging.LogRecord;
+import java.util.logging.SimpleFormatter;
+
+/**
+ * Implements a {@link java.util.Logger} handler that writes to the Android log. The
+ * implementation is rather straightforward. The name of the logger serves as
+ * the log tag. Only the log levels need to be converted appropriately. For
+ * this purpose, the following mapping is being used:
+ * 
+ * <table>
+ *   <tr>
+ *     <th>logger level</th>
+ *     <th>Android level</th>
+ *   </tr>
+ *   <tr>
+ *     <td>
+ *       SEVERE
+ *     </td>
+ *     <td>
+ *       ERROR
+ *     </td>
+ *   </tr>
+ *   <tr>
+ *     <td>
+ *       WARNING
+ *     </td>
+ *     <td>
+ *       WARN
+ *     </td>
+ *   </tr>
+ *   <tr>
+ *     <td>
+ *       INFO
+ *     </td>
+ *     <td>
+ *       INFO
+ *     </td>
+ *   </tr>
+ *   <tr>
+ *     <td>
+ *       CONFIG
+ *     </td>
+ *     <td>
+ *       DEBUG
+ *     </td>
+ *   </tr>
+ *   <tr>
+ *     <td>
+ *       FINE, FINER, FINEST
+ *     </td>
+ *     <td>
+ *       VERBOSE
+ *     </td>
+ *   </tr>
+ * </table>
+ */
+public class AndroidHandler extends Handler {
+    /**
+     * Holds the formatter for all Android log handlers.
+     */
+    private static final Formatter THE_FORMATTER = new SimpleFormatter();
+    
+    /**
+     * Constructs a new instance of the Android log handler.
+     */
+    public AndroidHandler() {
+        setFormatter(THE_FORMATTER);
+    }
+
+    @Override
+    public void close() {
+        // No need to close, but must implement abstract method.
+    }
+
+    @Override
+    public void flush() {
+        // No need to flush, but must implement abstract method.
+    }
+
+    @Override
+    public void publish(LogRecord record) {
+        try {
+            int level = getAndroidLevel(record.getLevel());
+            String tag = record.getLoggerName();
+
+            if (!Log.isLoggable(tag, level)) {
+                return;
+            }
+        
+            String msg;
+            try {
+                msg = getFormatter().format(record);
+            } catch (RuntimeException e) {
+                Log.e("AndroidHandler", "Error formatting log record", e);
+                msg = record.getMessage();
+            }
+            Log.println(level, tag, msg);
+        } catch (RuntimeException e) {
+            Log.e("AndroidHandler", "Error publishing log record", e);
+        }
+    }
+    
+    /**
+     * Converts a {@link java.util.Logger} logging level into an Android one.
+     * 
+     * @param level The {@link java.util.Logger} logging level.
+     * 
+     * @return The resulting Android logging level. 
+     */
+    static int getAndroidLevel(Level level)
+    {
+        int value = level.intValue();
+        
+        if (value >= Level.SEVERE.intValue()) {
+            return Log.ERROR;
+        } else if (value >= Level.WARNING.intValue()) {
+            return Log.WARN;
+        } else if (value >= Level.INFO.intValue()) {
+            return Log.INFO;
+        } else if (value >= Level.CONFIG.intValue()) {
+            return Log.DEBUG;
+        }  else {
+            return Log.VERBOSE;
+        }
+    }
+    
+}