improve parsing speed for json resources

org.hl7.fhir.r5/src/test/java/org/hl7/fhir/r5/test/JsonParserSpeedTests.java

@@ -0,0 +1,63 @@
+package org.hl7.fhir.r5.test;
+
+import java.io.IOException;
+import java.util.HashMap;
+import java.util.Map;
+
+import org.hl7.fhir.r5.test.utils.TestingUtilities;
+import org.hl7.fhir.utilities.json.JsonTrackingParser;
+import org.hl7.fhir.utilities.json.JsonTrackingParser.LocationData;
+import org.hl7.fhir.utilities.json.model.JsonObject;
+import org.hl7.fhir.utilities.json.parser.JsonParser;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+import com.google.gson.Gson;
+import com.google.gson.JsonElement;
+
+public class JsonParserSpeedTests {
+
+  private static final int MAX = 20;
+
+  @Test
+  public void testSpeed() throws IOException {
+    String cnt = TestingUtilities.loadTestResource("r5", "structuredefinition-language.json");
+    com.google.gson.JsonObject g = JsonTrackingParser.parse(cnt, null);
+    JsonObject j = JsonParser.parseObject(cnt);
+    JsonElement ge = new com.google.gson.JsonParser().parse(cnt);
+    
+    long t1 = 0;
+    long t2 = 0;
+    long t3 = 0;
+    long t4 = 0;
+    for (int k = 0; k < MAX; k++) {
+      long l = System.currentTimeMillis();
+      for (int i = 0; i < MAX; i++) {
+        new com.google.gson.JsonParser().parse(cnt);
+      }
+      t4 = t4 + System.currentTimeMillis() - l;
+      l = System.currentTimeMillis();
+      for (int i = 0; i < MAX; i++) {
+        JsonTrackingParser.parse(cnt, null);
+      }
+      t1 = t1 + System.currentTimeMillis() - l;
+      l = System.currentTimeMillis();
+      for (int i = 0; i < MAX; i++) {
+        Map<JsonElement, LocationData> map = new HashMap<>();
+        JsonTrackingParser.parse(cnt, map);
+      }
+      t2 = t2 + System.currentTimeMillis() - l;
+      l = System.currentTimeMillis();
+      for (int i = 0; i < MAX; i++) {
+        JsonParser.parseObject(cnt);
+      }
+      t3 = t3 + System.currentTimeMillis() - l;
+    }
+    System.out.println("jtp- = "+t1);
+    System.out.println("jtp+ = "+t2);
+    System.out.println("jp = "+t3);
+    System.out.println("gson = "+t4);
+    
+    Assertions.assertTrue(t1 > 0);
+  }
+}