--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/langtools/src/share/classes/com/sun/tools/javac/util/Constants.java	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,127 @@
+/*
+ * Copyright 2005 Sun Microsystems, Inc.  All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Sun designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Sun in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+package com.sun.tools.javac.util;
+
+import com.sun.tools.javac.code.Type;
+
+import static com.sun.tools.javac.code.TypeTags.*;
+
+/**
+ * Utilities for operating on constant values.
+ *
+ * <p><b>This is NOT part of any API supported by Sun Microsystems.  If
+ * you write code that depends on this, you do so at your own risk.
+ * This code and its internal interfaces are subject to change or
+ * deletion without notice.</b>
+ */
+public class Constants {
+
+    /**
+     * Converts a constant in internal representation (in which
+     * boolean, char, byte, short, and int are each represented by an
+     * Integer) into standard representation.  Other values (including
+     * null) are returned unchanged.
+     */
+    public static Object decode(Object value, Type type) {
+        if (value instanceof Integer) {
+            int i = (Integer) value;
+            switch (type.tag) {
+            case BOOLEAN:  return i != 0;
+            case CHAR:     return (char) i;
+            case BYTE:     return (byte) i;
+            case SHORT:    return (short) i;
+            }
+        }
+        return value;
+    }
+
+    /**
+     * Returns a string representation of a constant value (given in
+     * internal representation), quoted and formatted as in Java source.
+     */
+    public static String format(Object value, Type type) {
+        value = decode(value, type);
+        switch (type.tag) {
+        case BYTE:      return formatByte((Byte) value);
+        case LONG:      return formatLong((Long) value);
+        case FLOAT:     return formatFloat((Float) value);
+        case DOUBLE:    return formatDouble((Double) value);
+        case CHAR:      return formatChar((Character) value);
+        }
+        if (value instanceof String)
+            return formatString((String) value);
+        return value + "";
+    }
+
+    /**
+     * Returns a string representation of a constant value (given in
+     * standard wrapped representation), quoted and formatted as in
+     * Java source.
+     */
+    public static String format(Object value) {
+        if (value instanceof Byte)      return formatByte((Byte) value);
+        if (value instanceof Long)      return formatLong((Long) value);
+        if (value instanceof Float)     return formatFloat((Float) value);
+        if (value instanceof Double)    return formatDouble((Double) value);
+        if (value instanceof Character) return formatChar((Character) value);
+        if (value instanceof String)    return formatString((String) value);
+        return value + "";
+    }
+
+    private static String formatByte(byte b) {
+        return String.format("0x%02x", b);
+    }
+
+    private static String formatLong(long lng) {
+        return lng + "L";
+    }
+
+    private static String formatFloat(float f) {
+        if (Float.isNaN(f))
+            return "0.0f/0.0f";
+        else if (Float.isInfinite(f))
+            return (f < 0) ? "-1.0f/0.0f" : "1.0f/0.0f";
+        else
+            return f + "f";
+    }
+
+    private static String formatDouble(double d) {
+        if (Double.isNaN(d))
+            return "0.0/0.0";
+        else if (Double.isInfinite(d))
+            return (d < 0) ? "-1.0/0.0" : "1.0/0.0";
+        else
+            return d + "";
+    }
+
+    private static String formatChar(char c) {
+        return '\'' + Convert.quote(c) + '\'';
+    }
+
+    private static String formatString(String s) {
+        return '"' + Convert.quote(s) + '"';
+    }
+}