[ZEPPELIN-1999] skip fields of paragraph

docs/manual/interpreters.md

@@ -42,7 +42,7 @@ Zeppelin interpreter setting is the configuration of a given interpreter on Zepp
 <img src="../assets/themes/zeppelin/img/screenshots/interpreter_setting.png" width="500px">
 
 Properties are exported as environment variable when property name is consisted of upper characters, numbers and underscore ([A-Z_0-9]). Otherwise set properties as JVM property. 
-You may use parameters from the context of interpreter by add #{contextParameterName} in value, parameter can be of the following types: string, number, boolean. The list of available context parameters can be viewed in the class [InterpreterContext.java](https://github.com/apache/zeppelin/blob/master/zeppelin-interpreter/src/main/java/org/apache/zeppelin/interpreter/InterpreterContext.java) + parameter #{user}.
+You may use parameters from the context of interpreter by add #{contextParameterName} (except fields of paragraph) in value, parameter can be of the following types: string, number, boolean. The list of available context parameters can be viewed in the class [InterpreterContext.java](https://github.com/apache/zeppelin/blob/master/zeppelin-interpreter/src/main/java/org/apache/zeppelin/interpreter/InterpreterContext.java) + parameter #{user}.
 If context parameter is null then replaced by empty string.
 
 <img src="../assets/themes/zeppelin/img/screenshots/interpreter_setting_with_context_parameters.png" width="500px">

zeppelin-interpreter/src/main/java/org/apache/zeppelin/interpreter/Interpreter.java

@@ -310,6 +310,7 @@ public abstract class Interpreter {
     InterpreterContext interpreterContext = InterpreterContext.get();
     if (interpreterContext != null) {
       String markerTemplate = "#\\{%s\\}";
+      List<String> skipFields = Arrays.asList("paragraphTitle", "paragraphId", "paragraphText");
       List typesToProcess = Arrays.asList(String.class, Double.class, Float.class, Short.class,
           Byte.class, Character.class, Boolean.class, Integer.class, Long.class);
       for (String key : properties.stringPropertyNames()) {
@@ -317,7 +318,8 @@ public abstract class Interpreter {
         if (StringUtils.isNotEmpty(p)) {
           for (Field field : InterpreterContext.class.getDeclaredFields()) {
             Class clazz = field.getType();
-            if (typesToProcess.contains(clazz) || clazz.isPrimitive()) {
+            if (!skipFields.contains(field.getName()) && (typesToProcess.contains(clazz)
+                || clazz.isPrimitive())) {
               try {
                 Object value = FieldUtils.readField(field, interpreterContext, true);
                 p = p.replaceAll(String.format(markerTemplate, field.getName()),

zeppelin-interpreter/src/test/java/org/apache/zeppelin/interpreter/InterpreterTest.java

@@ -56,12 +56,14 @@ public class InterpreterTest {
   public void testPropertyWithReplacedContextFields() {
     String noteId = "testNoteId";
     String paragraphTitle = "testParagraphTitle";
+    String paragraphText = "testParagraphText";
+    String paragraphId = "testParagraphId";
     String user = "username";
     InterpreterContext.set(new InterpreterContext(noteId,
-        null,
+        paragraphId,
         null,
         paragraphTitle,
-        null,
+        paragraphText,
         new AuthenticationInfo("testUser", "testTicket"),
         null,
         null,
@@ -70,7 +72,7 @@ public class InterpreterTest {
         null,
         null));
     Properties p = new Properties();
-    p.put("p1", "paragraphTitle #{noteId}, #{paragraphTitle}, #{replName}, #{noteId}, #{user}," +
+    p.put("p1", "replName #{noteId}, #{paragraphTitle}, #{paragraphId}, #{paragraphText}, #{replName}, #{noteId}, #{user}," +
         " #{authenticationInfo}");
     MockInterpreterA intp = new MockInterpreterA(p);
     intp.setUserName(user);
@@ -78,8 +80,8 @@ public class InterpreterTest {
     InterpreterContext.remove();
 
     assertEquals(
-        String.format("paragraphTitle %s, %s, , %s, %s, #{authenticationInfo}", noteId,
-            paragraphTitle, noteId, user),
+        String.format("replName %s, #{paragraphTitle}, #{paragraphId}, #{paragraphText}, , %s, %s, #{authenticationInfo}", noteId,
+            noteId, user),
         actual
     );
   }