Lazily evaluated debug statement

platform/util/src/com/intellij/openapi/diagnostic/LogUtil.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2000-2011 JetBrains s.r.o.
+ * Copyright 2000-2012 JetBrains s.r.o.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -15,6 +15,7 @@
  */
 package com.intellij.openapi.diagnostic;
 
+import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
 public class LogUtil {
@@ -23,4 +24,13 @@ public class LogUtil {
   public static String objectAndClass(@Nullable final Object o) {
     return o != null ? o + " (" + o.getClass().getName() + ")" : "null";
   }
+
+  /**
+   * Format string syntax as in {@linkplain String#format(String, Object...)}.
+   */
+  public static void debug(@NotNull Logger logger, @NotNull String format, Object... args) {
+    if (logger.isDebugEnabled()) {
+      logger.debug(String.format(format, args));
+    }
+  }
 }