Merge pull request #187 from cie/bindings-java-subspace-hash

<rdar://problem/35125601> Java Bindings: Add hashCode method to subspace

bindings/java/src-completable/main/com/apple/foundationdb/subspace/Subspace.java

@@ -110,6 +110,9 @@ public class Subspace
 	}
 
     /**
+     * Create a human-readable string representation of this subspace. This is
+     * really only useful for debugging purposes, but it includes information
+     * on what raw prefix the subspace is using.
      * @return a printable representation of the subspace
      */
     @Override
@@ -117,6 +120,16 @@ public class Subspace
         return "Subspace(rawPrefix=" + printable(rawPrefix) + ")";
     }
 
+    /**
+     * Returns a hash-table compatible hash of this subspace. This is based off
+     * of the hash of the underlying byte-array prefix.
+     * @return a hash of this subspace
+     */
+    @Override
+    public int hashCode() {
+        return Arrays.hashCode(rawPrefix);
+    }
+
     /**
 	 * Gets a new subspace which is equivalent to this subspace with its prefix {@link Tuple} extended by
 	 * the specified {@code Object}. The object will be inserted into a {@link Tuple} and passed to {@link #get(Tuple)}.

bindings/java/src/main/com/apple/foundationdb/subspace/Subspace.java

@@ -110,6 +110,9 @@ public class Subspace
 	}
 
     /**
+     * Create a human-readable string representation of this subspace. This is
+     * really only useful for debugging purposes, but it includes information
+     * on what raw prefix the subspace is using.
      * @return a printable representation of the subspace
      */
     @Override
@@ -117,6 +120,16 @@ public class Subspace
         return "Subspace(rawPrefix=" + printable(rawPrefix) + ")";
     }
 
+    /**
+     * Returns a hash-table compatible hash of this subspace. This is based off
+     * of the hash of the underlying byte-array prefix.
+     * @return a hash of this subspace
+     */
+    @Override
+    public int hashCode() {
+        return Arrays.hashCode(rawPrefix);
+    }
+
     /**
 	 * Gets a new subspace which is equivalent to this subspace with its prefix {@link Tuple} extended by
 	 * the specified {@code Object}. The object will be inserted into a {@link Tuple} and passed to {@link #get(Tuple)}.