add more trove helpers

modules/elasticsearch/src/main/java/org/elasticsearch/common/trove/ExtTObjectIntHasMap.java

@@ -54,7 +54,7 @@ public class ExtTObjectIntHasMap<T> extends TObjectIntHashMap<T> {
         return this;
     }
 
-    @Override public int get(T key) {
+    @Override public final int get(T key) {
         int index = index(key);
         return index < 0 ? defaultReturnValue : _values[index];
     }

modules/elasticsearch/src/main/java/org/elasticsearch/common/trove/TBytesHashingStrategy.java

@@ -0,0 +1,36 @@
+/*
+ * Licensed to Elastic Search and Shay Banon under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. Elastic Search licenses this
+ * file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.elasticsearch.common.trove;
+
+import java.util.Arrays;
+
+/**
+ * @author kimchy (shay.banon)
+ */
+public class TBytesHashingStrategy implements TObjectHashingStrategy<byte[]> {
+
+    @Override public int computeHashCode(byte[] bytes) {
+        return Arrays.hashCode(bytes);
+    }
+
+    @Override public boolean equals(byte[] bytes, byte[] bytes1) {
+        return Arrays.equals(bytes, bytes1);
+    }
+}