fix Issue_356

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

@@ -245,44 +245,25 @@ public class EvaluatorFactory {
     }
 
     private static class PredicateMatchEvaluator implements Evaluator {
+        /**
+         * Evaluate the match operation of predicate.
+         *
+         * @param left the ValueNode
+         * @param right the ValueNode
+         * @param ctx the PredicateContext
+         * @return boolean
+         */
         @Override
-        public boolean evaluate(ValueNode left, ValueNode right, Predicate.PredicateContext ctx) {
-            Predicate.PredicateContext predicateContext = new PredicateContextImpl(
-                    getNodeValue(left),
+        public boolean evaluate(final ValueNode left, final ValueNode right, final Predicate.PredicateContext ctx) {
+            // CS304 Issue link: https://github.com/json-path/JsonPath/issues/356
+            // Create new predicateContext according to the left ValueNode
+            final Predicate.PredicateContext predicateContext = new PredicateContextImpl(
+                    left.getValue(),
                     ctx.root(),
                     ctx.configuration(),
                     null
             );
-            return right.asPredicateNode().getPredicate().apply(predicateContext);
-        }
-
-        public Object getNodeValue(ValueNode node) {
-            if(node.isPatternNode()){
-                return ((ValueNodes.PatternNode) node).getCompiledPattern();
-            } else if(node.isPathNode()){
-                return ((ValueNodes.PathNode) node).getPath();
-            } else if(node.isNumberNode()){
-                return ((ValueNodes.NumberNode) node).getNumber();
-            } else if(node.isStringNode()){
-                return ((ValueNodes.StringNode) node).getString();
-            } else if(node.isBooleanNode()){
-                return ((ValueNodes.BooleanNode) node).getBoolean();
-            } else if(node.isJsonNode()){
-                return ((ValueNodes.JsonNode) node).getJson();
-            } else if(node.isPredicateNode()){
-                return ((ValueNodes.PredicateNode) node).getPredicate();
-            } else if(node.isValueListNode()){
-                return ((ValueNodes.ValueListNode) node).getNodes();
-            } else if(node.isNullNode()){
-                return node.toString();
-            } else if(node.isUndefinedNode()){
-                return "undefined";
-            } else if(node.isClassNode()){
-                return ((ValueNodes.ClassNode) node).getClazz();
-            } else if(node.isOffsetDateTimeNode()){
-                return ((ValueNodes.OffsetDateTimeNode) node).getDate();
-            }
-            return null;
+            return right.asPredicateNode().getPredicate().apply(predicateContext); //NOPMD - suppressed LawOfDemeter //NOPMD - suppressed LawOfDemeter
         }
     }
 

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

@@ -16,6 +16,15 @@ public abstract class ValueNode {
 
     public abstract Class<?> type(Predicate.PredicateContext ctx);
 
+    /**
+     * Get the value of ValueNode.
+     * The class of return Object depends on the type of ValueNode.
+     *
+     * @return Object
+     */
+    // CS304 Issue link: https://github.com/json-path/JsonPath/issues/356
+    public abstract Object getValue();
+
     public boolean isPatternNode() {
         return false;
     }
@@ -157,6 +166,7 @@ public abstract class ValueNode {
 
 
 
+
     //----------------------------------------------------
     //
     // Factory methods

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

@@ -71,6 +71,11 @@ public interface ValueNodes {
             return Void.TYPE;
         }
 
+        @Override
+        public Object getValue() {
+            return compiledPattern;
+        }
+
         public boolean isPatternNode() {
             return true;
         }
@@ -125,6 +130,11 @@ public interface ValueNodes {
             else return Void.class;
         }
 
+        @Override
+        public Object getValue() {
+            return json;
+        }
+
         public boolean isJsonNode() {
             return true;
         }
@@ -248,6 +258,11 @@ public interface ValueNodes {
             return String.class;
         }
 
+        @Override
+        public Object getValue() {
+            return string;
+        }
+
         public boolean isStringNode() {
             return true;
         }
@@ -301,6 +316,11 @@ public interface ValueNodes {
             return Number.class;
         }
 
+        @Override
+        public Object getValue() {
+            return number;
+        }
+
         public boolean isNumberNode() {
             return true;
         }
@@ -357,6 +377,11 @@ public interface ValueNodes {
             return OffsetDateTimeNode.class;
         }
 
+        @Override
+        public Object getValue() {
+            return dateTime;
+        }
+
         public boolean isOffsetDateTimeNode() {
             return true;
         }
@@ -393,6 +418,11 @@ public interface ValueNodes {
             return Boolean.class;
         }
 
+        @Override
+        public Object getValue() {
+            return value;
+        }
+
         public boolean isBooleanNode() {
             return true;
         }
@@ -437,6 +467,11 @@ public interface ValueNodes {
             return Class.class;
         }
 
+        @Override
+        public Object getValue() {
+            return clazz;
+        }
+
         public boolean isClassNode() {
             return true;
         }
@@ -474,6 +509,11 @@ public interface ValueNodes {
             return Void.class;
         }
 
+        @Override
+        public Object getValue() {
+            return null;
+        }
+
         @Override
         public boolean isNullNode() {
             return true;
@@ -505,6 +545,11 @@ public interface ValueNodes {
             return Void.class;
         }
 
+        @Override
+        public Object getValue() {
+            return null;
+        }
+
         public UndefinedNode asUndefinedNode() {
             return this;
         }
@@ -540,6 +585,11 @@ public interface ValueNodes {
             return Void.class;
         }
 
+        @Override
+        public Object getValue() {
+            return predicate;
+        }
+
         public boolean isPredicateNode() {
             return true;
         }
@@ -587,6 +637,12 @@ public interface ValueNodes {
             return List.class;
         }
 
+        @Override
+        public Object getValue() {
+            List<ValueNode> valueNodes = new ArrayList<>(nodes);
+            return valueNodes;
+        }
+
         public boolean isValueListNode() {
             return true;
         }
@@ -656,6 +712,11 @@ public interface ValueNodes {
             return Void.class;
         }
 
+        @Override
+        public Object getValue() {
+            return path;
+        }
+
         public boolean isPathNode() {
             return true;
         }

json-path/src/test/java/com/jayway/jsonpath/Issue_356.java

@@ -1,3 +1,5 @@
+// CS304 (manually written)
+// Issue link: https://github.com/json-path/JsonPath/issues/356
 package com.jayway.jsonpath;
 
 import org.junit.Test;
@@ -6,68 +8,84 @@ import java.math.BigDecimal;
 import java.util.LinkedHashMap;
 
 import static com.jayway.jsonpath.Criteria.where;
+import static org.assertj.core.api.Assertions.assertThat;
 
 /**
  * Test for issue 356
  */
-public class Issue_356 {
-    private final static String json = "{\n" +
-            "  \"store\": {\n" +
-            "    \"book\": [\n" +
-            "      {\n" +
-            "        \"title\": \"Sayings of the Century\",\n" +
-            "        \"price\": {\n" +
-            "          \"value\": 8.95,\n" +
-            "          \"currency\": \"usd\"\n" +
-            "        }\n" +
-            "      },\n" +
-            "      {\n" +
-            "        \"title\": \"Sword of Honour\",\n" +
-            "        \"price\": {\n" +
-            "          \"value\": 12.99,\n" +
-            "          \"currency\": \"usd\"\n" +
-            "        }\n" +
-            "      },\n" +
-            "      {\n" +
-            "        \"title\": \"Moby Dick\",\n" +
-            "        \"price\": {\n" +
-            "          \"value\": 8.99,\n" +
-            "          \"currency\": \"usd\"\n" +
-            "        }\n" +
-            "      }\n" +
-            "    ]\n" +
-            "  }\n" +
-            "}";
+public class Issue_356 { //NOPMD - suppressed AtLeastOneConstructor //NOPMD - suppressed ClassNamingConventions
+    /**
+     * The json data for testing
+     */
+    private static final String JSON = "{\n"
+            + "  \"store\": {\n"
+            + "    \"book\": [\n"
+            + "      {\n"
+            + "        \"title\": \"Sayings of the Century\",\n"
+            + "        \"price\": {\n"
+            + "          \"value\": 8.95,\n"
+            + "          \"currency\": \"usd\"\n"
+            + "       }\n"
+            + "      },\n"
+            + "      {\n"
+            + "        \"title\": \"Sword of Honour\",\n"
+            + "        \"price\": {\n"
+            + "          \"value\": 12.99,\n"
+            + "          \"currency\": \"usd\"\n"
+            + "        }\n"
+            + "      },\n"
+            + "      {\n"
+            + "        \"title\": \"Moby Dick\",\n"
+            + "        \"price\": {\n"
+            + "          \"value\": 8.99,\n"
+            + "          \"currency\": \"usd\"\n"
+            + "        }\n"
+            + "      }\n"
+            + "    ]\n"
+            + "  }\n"
+            + "}";
+    /**
+     * The constraint for testing
+     */
+    private static final double CONSTRAINT = 9;
+
+    /**
+     * test1 for "...price.value" PredicateContext,
+     * it will return the book with the price value less than 9
+     */
     @Test
-    public void test1(){
-        Object ans = JsonPath.parse(json).read("$..book[?]", Filter.filter(where("price.value").matches(new Predicate() {
+    public void test1() {
+        final Object ans = JsonPath.parse(JSON).read("$..book[?]", Filter.filter(where("price.value").matches(new Predicate() { //NOPMD - suppressed DataflowAnomalyAnalysis
             @Override
-            public boolean apply(PredicateContext ctx) {
+            public boolean apply(final PredicateContext ctx) {
                 // some custom logic with expecting value number in context
-                return ((BigDecimal)ctx.item()).doubleValue() < 9;
+                return ((BigDecimal) ctx.item()).doubleValue() < CONSTRAINT;
             }
         })));
-        // System.out.println(ans);
-        assert(ans.toString().equals("[{\"title\":\"Sayings of the Century\"," +
-                "\"price\":{\"value\":8.95,\"currency\":\"usd\"}}," +
-                "{\"title\":\"Moby Dick\"," +
-                "\"price\":{\"value\":8.99,\"currency\":\"usd\"}}]"));
+        assertThat(ans.toString().equals("[{\"title\":\"Sayings of the Century\"," //NOPMD - suppressed LawOfDemeter
+                + "\"price\":{\"value\":8.95,\"currency\":\"usd\"}},"
+                + "{\"title\":\"Moby Dick\","
+                + "\"price\":{\"value\":8.99,\"currency\":\"usd\"}}]")).isTrue();
     }
 
+
+    /**
+     * test2 for "...price" PredicateContext,
+     * it will return the book with the price value less than 9
+     */
     @Test
-    public void test2(){
-        Object ans = JsonPath.parse(json).read("$..book[?]", Filter.filter(where("price").matches(new Predicate() {
+    public void test2() {
+        final Object ans = JsonPath.parse(JSON).read("$..book[?]", Filter.filter(where("price").matches(new Predicate() { //NOPMD - suppressed DataflowAnomalyAnalysis
             @Override
-            public boolean apply(PredicateContext ctx) {
+            public boolean apply(final PredicateContext ctx) { //NOPMD - suppressed CommentRequired
                 // some custom logic with expecting value number in context
-                return ((LinkedHashMap<String, Double>) ctx.item()).get("value") < 9;
+                return ((LinkedHashMap<String, Double>) ctx.item()).get("value") < CONSTRAINT;
             }
         })));
-        // System.out.println(ans);
-        assert(ans.toString().equals("[{\"title\":\"Sayings of the Century\"," +
-                "\"price\":{\"value\":8.95,\"currency\":\"usd\"}}," +
-                "{\"title\":\"Moby Dick\"," +
-                "\"price\":{\"value\":8.99,\"currency\":\"usd\"}}]"));
+        assertThat(ans.toString().equals("[{\"title\":\"Sayings of the Century\"," //NOPMD - suppressed LawOfDemeter
+                + "\"price\":{\"value\":8.95,\"currency\":\"usd\"}},"
+                + "{\"title\":\"Moby Dick\","
+                + "\"price\":{\"value\":8.99,\"currency\":\"usd\"}}]")).isTrue();
     }
 
 }