Fixed EMPTY operator.

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

@@ -350,9 +350,20 @@ public class Criteria implements Predicate {
      *
      * @return the criteria
      */
+    @Deprecated
     public Criteria notEmpty() {
-        this.criteriaType = RelationalOperator.NOT_EMPTY;
-        this.right = ValueNode.TRUE;
+        return empty(false);
+    }
+
+    /**
+     * The <code>notEmpty</code> operator checks that an array or String is empty.
+     *
+     * @param empty should be empty
+     * @return the criteria
+     */
+    public Criteria empty(boolean empty) {
+        this.criteriaType = RelationalOperator.EMPTY;
+        this.right = empty ? ValueNode.TRUE : ValueNode.FALSE;
         return this;
     }
 

json-path/src/main/java/com/jayway/jsonpath/internal/filter/EvaluatorFactory.java

@@ -20,7 +20,7 @@ public class EvaluatorFactory {
         evaluators.put(RelationalOperator.GTE, new GreaterThanEqualsEvaluator());
         evaluators.put(RelationalOperator.REGEX, new RegexpEvaluator());
         evaluators.put(RelationalOperator.SIZE, new SizeEvaluator());
-        evaluators.put(RelationalOperator.NOT_EMPTY, new NotEmptyEvaluator());
+        evaluators.put(RelationalOperator.EMPTY, new EmptyEvaluator());
         evaluators.put(RelationalOperator.IN, new InEvaluator());
         evaluators.put(RelationalOperator.NIN, new NotInEvaluator());
         evaluators.put(RelationalOperator.ALL, new AllEvaluator());
@@ -130,13 +130,13 @@ public class EvaluatorFactory {
         }
     }
 
-    private static class NotEmptyEvaluator implements Evaluator {
+    private static class EmptyEvaluator implements Evaluator {
         @Override
         public boolean evaluate(ValueNode left, ValueNode right, Predicate.PredicateContext ctx) {
             if(left.isStringNode()){
-                return !left.asStringNode().isEmpty();
+                return left.asStringNode().isEmpty() == right.asBooleanNode().getBoolean();
             } else if(left.isJsonNode()){
-                return !left.asJsonNode().isEmpty(ctx);
+                return left.asJsonNode().isEmpty(ctx) == right.asBooleanNode().getBoolean();
             }
             return false;
         }

json-path/src/main/java/com/jayway/jsonpath/internal/filter/FilterCompiler.java

@@ -150,10 +150,10 @@ public class FilterCompiler {
             }
         }
         RelationalOperator operator = readRelationalOperator();
-        ValueNode right = ValueNode.TRUE;
-        if(operator != RelationalOperator.NOT_EMPTY) {
-            right = readValueNode();
-        }
+        //ValueNode right = ValueNode.TRUE;
+        //if(operator != RelationalOperator.EMPTY) {
+        ValueNode right = readValueNode();
+        //}
 
         return new RelationalExpressionNode(left, operator, right);
     }

json-path/src/main/java/com/jayway/jsonpath/internal/filter/RelationalOperator.java

@@ -19,7 +19,7 @@ public enum RelationalOperator {
     EXISTS("¦EXISTS¦"),
     TYPE("¦TYPE¦"),
     MATCHES("¦MATCHES¦"),
-    NOT_EMPTY("¦NOT_EMPTY¦");
+    EMPTY("¦EMPTY¦");
 
     private final String operatorString;
 

json-path/src/test/java/com/jayway/jsonpath/FilterParseTest.java

@@ -176,8 +176,8 @@ public class FilterParseTest {
     @Test
     public void a_not_empty_filter_can_be_serialized() {
 
-        String filter = filter(where("a").notEmpty()).toString();
-        String parsed = parse("[?(@['a'] ¦NOT_EMPTY¦)]").toString();
+        String filter = filter(where("a").empty(false)).toString();
+        String parsed = parse("[?(@['a'] ¦EMPTY¦ false)]").toString();
 
         assertThat(filter).isEqualTo(parsed);
     }

json-path/src/test/java/com/jayway/jsonpath/FilterTest.java

@@ -370,7 +370,7 @@ public class FilterTest extends BaseTest {
 
     //----------------------------------------------------------------------------
     //
-    // NOT_EMPTY
+    // EMPTY
     //
     //----------------------------------------------------------------------------
     @Test