1 files changed, 51 insertions, 0 deletions
diff --git a/src/library/scala/runtime/Equality.java b/src/library/scala/runtime/Equality.java
new file mode 100644
index 0000000000..3ec89360b8
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+++ b/src/library/scala/runtime/Equality.java
@@ -0,0 +1,51 @@
+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2006-2009, LAMP/EPFL             **
+**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+\*                                                                      */
+
+// $Id$
+
+
+package scala.runtime;
+
+import java.io.*;
+
+/** An object (static class) encapsulating the variations on equality
+ *  presently under consideration.  It's written in java so it can easily
+ *  be made available to BoxesRunTime as well as scala code.
+ */
+public class Equality
+{
+  public static boolean disallowNullEquals = true;
+  public static boolean disallowPrimitiveEquals = true;
+  public static boolean warnOnEqualsAny = true;
+  public static boolean callCanEqualIfAvailable = true;
+  public static boolean logEverything = false;
+
+  public static String obToString(Object o) {
+    String s = o.toString() + " (" + o.getClass().getSimpleName() + ")";
+    return s.replaceAll("\\n", " ");
+  }
+
+  public static void logInternal(String msg, Object a, Object b, String where) {
+    log(String.format("%s %s == %s at %s", msg, obToString(a), obToString(b), where));
+  }
+
+  public static String whereAreWe() {
+    StackTraceElement[] es = Thread.currentThread().getStackTrace();
+    if (es.length < 4)
+      return "<unknown>";
+
+    StackTraceElement e = es[3];
+    String clazz = e.getClassName().replaceAll("\\$.*$", "\\$...");
+    return String.format("%s.%s(%s.%d)", clazz, e.getMethodName(), e.getFileName(), e.getLineNumber());
+  }
+
+  public static void log(String msg) {
+    if (logEverything)
+      System.out.println(msg);
+  }
+}