add EscapeJSON: explicit JSON contente excape function

virtdata-lib-basics/src/main/java/io/nosqlbench/virtdata/library/basics/shared/from_string/EscapeJSON.java

@@ -0,0 +1,32 @@
+package io.nosqlbench.virtdata.library.basics.shared.from_string;
+
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+import io.nosqlbench.virtdata.api.annotations.ThreadSafeMapper;
+import org.apache.commons.text.StringEscapeUtils;
+
+import java.util.function.Function;
+
+/**
+ * Escape all special characters which are required to be escaped when found within
+ * JSON content according to the JSON spec
+ * <pre>{@code
+ * \b  Backspace (ascii code 08)
+ * \f  Form feed (ascii code 0C)
+ * \n  New line
+ * \r  Carriage return
+ * \t  Tab
+ * \"  Double quote
+ * \\  Backslash character
+ * \/  Forward slash
+ * }</pre>
+ */
+@ThreadSafeMapper
+public class EscapeJSON implements Function<String,String> {
+    Gson gson = new GsonBuilder().create();
+
+    @Override
+    public String apply(String s) {
+        return StringEscapeUtils.escapeJson(s);
+    }
+}

virtdata-lib-basics/src/test/java/io/nosqlbench/virtdata/library/basics/shared/from_string/EscapeJSONTest.java

@@ -0,0 +1,16 @@
+package io.nosqlbench.virtdata.library.basics.shared.from_string;
+
+
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class EscapeJSONTest {
+
+    @Test
+    public void testEscapes() {
+        EscapeJSON escapeJSON = new EscapeJSON();
+        assertThat(escapeJSON.apply("\t")).isEqualTo("\\t");
+    }
+
+}