add an unwrap(Object) method to JsonProvider, use it when extracting values for Criteria evaluation

json-path/src/main/java/com/jayway/jsonpath/Criteria.java

@@ -352,7 +352,7 @@ public class Criteria implements Predicate {
                 res = leftPath.evaluate(doc, ctx.root(), ctx.configuration()).getValue();
             }
         }
-        return res;
+        return res == null ? null : ctx.configuration().jsonProvider().unwrap(res);
     }
 
     private boolean eval(PredicateContext ctx) {

json-path/src/main/java/com/jayway/jsonpath/internal/spi/json/AbstractJsonProvider.java

@@ -16,6 +16,7 @@ package com.jayway.jsonpath.internal.spi.json;
 
 import com.jayway.jsonpath.JsonPathException;
 import com.jayway.jsonpath.spi.json.JsonProvider;
+
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -46,11 +47,11 @@ public abstract class AbstractJsonProvider implements JsonProvider {
      * @return the entry at the given index
      */
     public Object getArrayIndex(Object obj, int idx) {
-        return getArrayIndex(obj, idx, true);
+        return ((List) obj).get(idx);
     }
 
-    public Object getArrayIndex(Object obj, int idx, boolean unwrap){
-        return ((List) obj).get(idx);
+    public final Object getArrayIndex(Object obj, int idx, boolean unwrap){
+        return getArrayIndex(obj, idx);
     }
 
     public void setArrayIndex(Object array, int index, Object newValue) {
@@ -177,4 +178,9 @@ public abstract class AbstractJsonProvider implements JsonProvider {
             return ((Map) obj).values();
     }
 
+    @Override
+    public Object unwrap(Object obj) {
+        return obj;
+    }
+
 }

json-path/src/main/java/com/jayway/jsonpath/internal/spi/json/GsonJsonProvider.java

@@ -44,7 +44,7 @@ public class GsonJsonProvider extends AbstractJsonProvider {
     private static final Gson gson = new GsonBuilder().create();
 
 
-    public static Object unwrap(Object o) {
+    public Object unwrap(Object o) {
 
         if (o == null) {
             return null;
@@ -129,17 +129,7 @@ public class GsonJsonProvider extends AbstractJsonProvider {
 
     @Override
     public Object getArrayIndex(Object obj, int idx) {
-        return getArrayIndex(obj, idx, true);
-    }
-
-    @Override
-    public Object getArrayIndex(Object obj, int idx, boolean unwrap){
-        if(unwrap){
-            return unwrap(toJsonArray(obj).get(idx));
-        }
-        else {
-            return toJsonArray(obj).get(idx);
-        }
+        return toJsonArray(obj).get(idx);
     }
 
     @Override

json-path/src/main/java/com/jayway/jsonpath/internal/spi/json/JacksonJsonNodeJsonProvider.java

@@ -84,7 +84,7 @@ public class JacksonJsonNodeJsonProvider extends AbstractJsonProvider {
         return JsonNodeFactory.instance.objectNode();
     }
 
-    public static Object unwrap(Object o) {
+    public Object unwrap(Object o) {
 
         if (o == null) {
             return null;
@@ -128,17 +128,7 @@ public class JacksonJsonNodeJsonProvider extends AbstractJsonProvider {
 
     @Override
     public Object getArrayIndex(Object obj, int idx) {
-        return getArrayIndex(obj, idx, true);
-    }
-
-    @Override
-    public Object getArrayIndex(Object obj, int idx, boolean unwrap){
-        if(unwrap){
-            return unwrap(toJsonArray(obj).get(idx));
-        }
-        else {
-            return toJsonArray(obj).get(idx);
-        }
+        return toJsonArray(obj).get(idx);
     }
 
     @Override

json-path/src/main/java/com/jayway/jsonpath/internal/token/EvaluationContextImpl.java

@@ -23,6 +23,7 @@ import com.jayway.jsonpath.internal.EvaluationContext;
 import com.jayway.jsonpath.internal.Path;
 import com.jayway.jsonpath.internal.PathRef;
 import com.jayway.jsonpath.spi.json.JsonProvider;
+
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -134,7 +135,11 @@ public class EvaluationContextImpl implements EvaluationContext {
             if(resultIndex == 0){
                 throw new PathNotFoundException("No results for path: " + path.toString());
             }
-            return (T) jsonProvider().getArrayIndex(valueResult, 0, unwrap);
+            Object value = jsonProvider().getArrayIndex(valueResult, 0);
+            if (value != null && unwrap){
+              value = jsonProvider().unwrap(value);
+            }
+            return (T) value;
         }
         return (T)valueResult;
     }

json-path/src/main/java/com/jayway/jsonpath/spi/json/JsonProvider.java

@@ -109,6 +109,7 @@ public interface JsonProvider {
      * @param unwrap should provider specific data type be unwrapped
      * @return the entry at the given index
      */
+    @Deprecated
     Object getArrayIndex(Object obj, int idx, boolean unwrap);
 
     /**
@@ -154,5 +155,14 @@ public interface JsonProvider {
      */
     boolean isMap(Object obj);
 
+    /**
+     * Extracts a value from a wrapper object. For JSON providers that to not wrap
+     * values, this will usually be the object itself.
+     *
+     * @param obj a value holder object
+     * @return the unwrapped value.
+     */
+    Object unwrap(Object obj);
+
 
 }