Also interpret cost JSON object in case it is returned by oak search

engine #730

accesscontroltool-bundle/src/main/java/biz/netcentric/cq/tools/actool/helper/QueryHelper.java

@@ -42,6 +42,8 @@
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import com.fasterxml.jackson.core.JsonParser;
+import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.JsonNode;
 import com.fasterxml.jackson.databind.ObjectMapper;
 
@@ -143,14 +145,9 @@ static boolean hasQueryIndexForACLs(final Session session) throws RepositoryExce
         Row row = queryResult.getRows().nextRow();
         // inspired by https://github.com/apache/jackrabbit-oak/blob/cc8adb42d89bc4625138a62ab074e7794a4d39ab/oak-jcr/src/test/java/org/apache/jackrabbit/oak/jcr/query/QueryTest.java#L1092
         String plan = row.getValue("plan").getString();
-        String costJson = plan.substring(plan.lastIndexOf('{'));
-
-        // use jackson for JSON parsing
-        ObjectMapper mapper = new ObjectMapper();
+        String costJsonStr = plan.substring(plan.lastIndexOf('{'));
 
-        // read the json strings and convert it into JsonNode
-        JsonNode node = mapper.readTree(costJson);
-        double cost = node.get("s").asDouble(Double.MAX_VALUE);
+        double cost = getCostFromJsonStr(costJsonStr);
         // look at https://jackrabbit.apache.org/oak/docs/query/query-engine.html#cost-calculation for the threshold
         // https://github.com/apache/jackrabbit-oak/blob/cc8adb42d89bc4625138a62ab074e7794a4d39ab/oak-core/src/main/java/org/apache/jackrabbit/oak/query/index/TraversingIndex.java#L75
 
@@ -160,6 +157,18 @@ static boolean hasQueryIndexForACLs(final Session session) throws RepositoryExce
         return cost <= COST_THRESHOLD_FOR_QUERY_INDEX;
     }
 
+    static double getCostFromJsonStr(String jsonStr) throws JsonProcessingException, IOException {
+        // use jackson for JSON parsing
+        ObjectMapper mapper = new ObjectMapper().configure(JsonParser.Feature.ALLOW_UNQUOTED_FIELD_NAMES, true);
+
+        // read the json strings and convert it into JsonNode
+        JsonNode node = mapper.readTree(jsonStr);
+
+        JsonNode sNode = node.get("s");
+        double cost = sNode.isContainerNode() ? sNode.get("perExecution").asDouble(Double.MAX_VALUE) : sNode.asDouble(Double.MAX_VALUE);
+        return cost;
+    }
+
     /** Get Nodes with XPATH Query. */
     public static Set<String> getNodePathsFromQuery(final Session session,
             final String xpathQuery) throws RepositoryException {

accesscontroltool-bundle/src/test/java/biz/netcentric/cq/tools/actool/helper/QueryHelperTest.java

@@ -0,0 +1,35 @@
+/*
+ * (C) Copyright 2023 Cognizant Netcentric.
+ *
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ */
+package biz.netcentric.cq.tools.actool.helper;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import java.io.IOException;
+
+import org.junit.jupiter.api.Test;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+
+public class QueryHelperTest {
+
+    @Test
+    public void testGetCostFromJsonScalar() throws JsonProcessingException, IOException {
+
+        assertEquals(189540, QueryHelper.getCostFromJsonStr("{ \"s\": 189540.0 }"));
+    }
+
+    @Test
+    public void testGetCostFromJsonObject() throws JsonProcessingException, IOException {
+
+        // the keys in sub object happen to be unquoted, the impl needs to use JsonParser.Feature.ALLOW_UNQUOTED_FIELD_NAMES
+        assertEquals(1, QueryHelper.getCostFromJsonStr("{ \"s\": { perEntry: 1.0, perExecution: 1.0, count: 47814 } }"));
+
+    }
+
+}