LUCENE-4615: ReusingFacetArrays was left out by mistake

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1420162 13f79535-47bb-0310-9956-ffa450edef68

lucene/facet/src/java/org/apache/lucene/facet/search/ReusingFacetArrays.java

@@ -0,0 +1,51 @@
+package org.apache.lucene.facet.search;
+
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF 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.
+ */
+
+/**
+ * A {@link FacetArrays} which uses the {@link ArraysPool} to allocate new
+ * arrays and pool them on {@link #free()}.
+ * 
+ * @lucene.experimental
+ */
+public class ReusingFacetArrays extends FacetArrays {
+
+  private final ArraysPool arraysPool;
+
+  public ReusingFacetArrays(ArraysPool arraysPool) {
+    super(arraysPool.arrayLength);
+    this.arraysPool = arraysPool;
+  }
+
+  @Override
+  protected int[] newIntArray() {
+    return arraysPool.allocateIntArray();
+  }
+  
+  @Override
+  protected float[] newFloatArray() {
+    return arraysPool.allocateFloatArray();
+  }
+  
+  @Override
+  protected void doFree(float[] floats, int[] ints) {
+    arraysPool.free(floats);
+    arraysPool.free(ints);
+  }
+  
+}