--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jdk.incubator.adba/share/classes/jdk/incubator/sql2/ShardingKey.java	Mon Apr 02 14:19:45 2018 -0400
@@ -0,0 +1,116 @@
+/*
+ * Copyright (c)  2017, 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.
+ */
+package jdk.incubator.sql2;
+
+/**
+ * Interface used to indicate that this object represents a Sharding Key. A
+ * {@link ShardingKey} instance is only guaranteed to be compatible with the
+ * data source instance that it was derived from. A {@link ShardingKey} is
+ * created using {@link Builder}.
+ * <p>
+ * The following example illustrates the use of {@link Builder} to create a
+ * {@link ShardingKey}:
+ * <pre>
+ * {@code
+ *
+ *     DataSource ds = new MyDataSource();
+ *     ShardingKey shardingKey = ds.createShardingKeyBuilder()
+ *                           .subkey("abc", JDBCType.VARCHAR)
+ *                           .subkey(94002, JDBCType.INTEGER)
+ *                           .build();
+ * }
+ * </pre>
+ * <p>
+ *
+ * A {@link ShardingKey} is used for specifying a
+ * {@link AdbaConnectionProperty#SHARDING_KEY} or a
+ * {@link AdbaConnectionProperty#SHARDING_GROUP_KEY}. Databases that support
+ * composite Sharding may use a * to specify a additional level of partitioning
+ * within to specify a additional level of partitioning within the Shard.
+ * <p>
+ * The following example illustrates the use of {@link Builder} to create a
+ * {@link AdbaConnectionProperty#SHARDING_GROUP_KEY} for an eastern region with
+ * a {@link AdbaConnectionProperty#SHARDING_KEY} specified for the Pittsburgh
+ * branch office:
+ * <pre>
+ * {@code
+ *
+ *     DataSource ds = new MyDataSource();
+ *     ShardingKey superShardingKey = ds.shardingKeyBuilder()
+ *                           .subkey("EASTERN_REGION", JDBCType.VARCHAR)
+ *                           .build();
+ *     ShardingKey shardingKey = ds.shardingKeyBuilder()
+ *                           .subkey("PITTSBURGH_BRANCH", JDBCType.VARCHAR)
+ *                           .build();
+ *     Connection con = ds.builder()
+ *                           .property(SHARDING_GROUP_KEY, superShardingKey)
+ *                           .property(SHARDING_KEY, shardingKey)
+ *                           .build();
+ * }
+ * </pre>
+ */
+public interface ShardingKey {
+
+  /**
+   * A builder created from a {@link DataSource} or object, used to create a
+   * {@link ShardingKey} with sub-keys of supported data types. Implementations
+   * must support JDBCType.VARCHAR and may also support additional data types.
+   * <p>
+   * The following example illustrates the use of {@link Builder} to create a
+   * {@link ShardingKey}:
+   * <pre>
+   * {@code
+   *
+   *     DataSource ds = new MyDataSource();
+   *     ShardingKey shardingKey = ds.createShardingKeyBuilder()
+   *                           .subkey("abc", JDBCType.VARCHAR)
+   *                           .subkey(94002, JDBCType.INTEGER)
+   *                           .build();
+   * }
+   * </pre>
+   */
+  public interface Builder {
+
+    /**
+     * This method will be called to add a subkey into a Sharding Key object
+     * being built. The order in which subkey method is called is important as
+     * it indicates the order of placement of the subkey within the Sharding
+     * Key.
+     *
+     * @param subkey contains the object that needs to be part of shard sub key
+     * @param subkeyType sub-key data type of type java.sql.SQLType
+     * @return this builder object
+     */
+    public Builder subkey(Object subkey, SqlType subkeyType);
+
+    /**
+     * Returns an instance of the object defined by this builder.
+     *
+     * @return The built object
+     */
+    public ShardingKey build();
+  }
+
+}