String quote style is serialized #154

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

@@ -395,11 +395,18 @@ public abstract class ValueNode {
 
     public static class StringNode extends ValueNode {
         private final String string;
+        private boolean useSingleQuote = true;
 
         private StringNode(CharSequence charSequence, boolean escape) {
             if(charSequence.length() > 1){
-                if(charSequence.charAt(0) == '\'' && charSequence.charAt(charSequence.length()-1) == '\''){
+                char open = charSequence.charAt(0);
+                char close = charSequence.charAt(charSequence.length()-1);
+
+                if(open == '\'' && close == '\''){
+                    charSequence = charSequence.subSequence(1, charSequence.length()-1);
+                } else if(open == '"' && close == '"'){
                     charSequence = charSequence.subSequence(1, charSequence.length()-1);
+                    useSingleQuote = false;
                 }
             }
             string = escape ? Utils.unescape(charSequence.toString()) : charSequence.toString();
@@ -436,7 +443,8 @@ public abstract class ValueNode {
 
         @Override
         public String toString() {
-            return "'" + Utils.escape(string, true) + "'";
+            String quote = useSingleQuote ? "'" : "\"";
+            return quote + Utils.escape(string, true) + quote;
         }
 
         @Override

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

@@ -48,6 +48,12 @@ public class FilterCompilerTest {
 
     }
 
+    @Test
+    public void string_quoute_style_is_serialized() {
+        assertThat(compile("[?('apa' == 'apa')]").toString()).isEqualTo("[?('apa' == 'apa')]");
+        assertThat(compile("[?('apa' == \"apa\")]").toString()).isEqualTo("[?('apa' == \"apa\")]");
+    }
+
 
     @Test
     public void invalid_filters_does_not_compile() {