--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/java.base/share/classes/java/text/RuleBasedCollationKey.java	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,123 @@
+/*
+ * Copyright (c) 2005, Oracle and/or its affiliates. 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.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * (C) Copyright Taligent, Inc. 1996 - All Rights Reserved
+ * (C) Copyright IBM Corp. 1996 - All Rights Reserved
+ *
+ *   The original version of this source code and documentation is copyrighted
+ * and owned by Taligent, Inc., a wholly-owned subsidiary of IBM. These
+ * materials are provided under terms of a License Agreement between Taligent
+ * and Sun. This technology is protected by multiple US and International
+ * patents. This notice and attribution to Taligent may not be removed.
+ *   Taligent is a registered trademark of Taligent, Inc.
+ *
+ */
+
+package java.text;
+
+/**
+ * A RuleBasedCollationKey is a concrete implementation of CollationKey class.
+ * The RuleBasedCollationKey class is used by the RuleBasedCollator class.
+ */
+
+final class RuleBasedCollationKey extends CollationKey {
+    /**
+     * Compare this RuleBasedCollationKey to target. The collation rules of the
+     * Collator object which created these keys are applied. <strong>Note:</strong>
+     * RuleBasedCollationKeys created by different Collators can not be compared.
+     * @param target target RuleBasedCollationKey
+     * @return Returns an integer value. Value is less than zero if this is less
+     * than target, value is zero if this and target are equal and value is greater than
+     * zero if this is greater than target.
+     * @see java.text.Collator#compare
+     */
+    public int compareTo(CollationKey target)
+    {
+        int result = key.compareTo(((RuleBasedCollationKey)(target)).key);
+        if (result <= Collator.LESS)
+            return Collator.LESS;
+        else if (result >= Collator.GREATER)
+            return Collator.GREATER;
+        return Collator.EQUAL;
+    }
+
+    /**
+     * Compare this RuleBasedCollationKey and the target for equality.
+     * The collation rules of the Collator object which created these keys are applied.
+     * <strong>Note:</strong> RuleBasedCollationKeys created by different Collators can not be
+     * compared.
+     * @param target the RuleBasedCollationKey to compare to.
+     * @return Returns true if two objects are equal, false otherwise.
+     */
+    public boolean equals(Object target) {
+        if (this == target) return true;
+        if (target == null || !getClass().equals(target.getClass())) {
+            return false;
+        }
+        RuleBasedCollationKey other = (RuleBasedCollationKey)target;
+        return key.equals(other.key);
+    }
+
+    /**
+     * Creates a hash code for this RuleBasedCollationKey. The hash value is calculated on the
+     * key itself, not the String from which the key was created.  Thus
+     * if x and y are RuleBasedCollationKeys, then x.hashCode(x) == y.hashCode() if
+     * x.equals(y) is true.  This allows language-sensitive comparison in a hash table.
+     * See the CollatinKey class description for an example.
+     * @return the hash value based on the string's collation order.
+     */
+    public int hashCode() {
+        return (key.hashCode());
+    }
+
+    /**
+     * Converts the RuleBasedCollationKey to a sequence of bits. If two RuleBasedCollationKeys
+     * could be legitimately compared, then one could compare the byte arrays
+     * for each of those keys to obtain the same result.  Byte arrays are
+     * organized most significant byte first.
+     */
+    public byte[] toByteArray() {
+
+        char[] src = key.toCharArray();
+        byte[] dest = new byte[ 2*src.length ];
+        int j = 0;
+        for( int i=0; i<src.length; i++ ) {
+            dest[j++] = (byte)(src[i] >>> 8);
+            dest[j++] = (byte)(src[i] & 0x00ff);
+        }
+        return dest;
+    }
+
+    /**
+     * A RuleBasedCollationKey can only be generated by Collator objects.
+     */
+    RuleBasedCollationKey(String source, String key) {
+        super(source);
+        this.key = key;
+    }
+    private String key = null;
+
+}