Initial version.

1 files changed, 30 insertions, 0 deletions

diff --git a/sources/scalac/util/UniqueID.java b/sources/scalac/util/UniqueID.java
new file mode 100644
index 0000000000..59e31a9de6
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+++ b/sources/scalac/util/UniqueID.java
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+/*     ____ ____  ____ ____  ______                                     *\
+**    / __// __ \/ __// __ \/ ____/    SOcos COmpiles Scala             **
+**  __\_ \/ /_/ / /__/ /_/ /\_ \       (c) 2002, LAMP/EPFL              **
+** /_____/\____/\___/\____/____/                                        **
+**                                                                      **
+\*                                                                      */
+
+// $Id$
+
+package scalac.util;
+
+import java.util.*;
+
+/**
+ * Class to assign unique and small numbers to objects, based on their
+ * identity.
+ *
+ * @author Michel Schinz
+ * @version 1.0
+ */
+
+public class UniqueID {
+    protected Map ids = new HashMap();
+
+    public int id(Object obj) {
+        if (! ids.containsKey(obj))
+            ids.put(obj, new Integer(ids.size()));
+        return ((Integer)ids.get(obj)).intValue();
+    }
+}