add embedding to convert int array to string

nb-virtdata/virtdata-lib-hdf5/src/main/java/io/nosqlbench/virtdata/library/hdf5/from_long/to_string/IntArrayToString.java

@@ -0,0 +1,41 @@
+/*
+ * Copyright (c) nosqlbench
+ *
+ * Licensed 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 io.nosqlbench.virtdata.library.hdf5.from_long.to_string;
+
+import io.nosqlbench.virtdata.api.annotations.Categories;
+import io.nosqlbench.virtdata.api.annotations.Category;
+import io.nosqlbench.virtdata.api.annotations.ThreadSafeMapper;
+
+import java.util.function.Function;
+
+@ThreadSafeMapper
+@Categories(Category.experimental)
+public class IntArrayToString implements Function<int[],String> {
+    private final StringBuilder sb = new StringBuilder();
+
+    @Override
+    public String apply(int[] ints) {
+        sb.setLength(0);
+        for (int i : ints) {
+            sb.append(i);
+            if (i != ints[ints.length - 1]) {
+                sb.append(",");
+            }
+        }
+        return sb.toString();
+    }
+}