DATACMNS-16, DATAJPA-29 - Cleaned up Part class.

Removed operator property (as it was JPA specific) and added 'In' keyword.

spring-data-commons-core/src/main/java/org/springframework/data/repository/query/parser/Part.java

@@ -129,31 +129,32 @@ public class Part {
      */
     public static enum Type {
 
-        BETWEEN(null, 2, "Between"),
+        BETWEEN(2, "Between"),
 
-        IS_NOT_NULL(null, 0, "IsNotNull", "NotNull"),
+        IS_NOT_NULL(0, "IsNotNull", "NotNull"),
 
-        IS_NULL(null, 0, "IsNull", "Null"),
+        IS_NULL(0, "IsNull", "Null"),
 
-        LESS_THAN("<", "LessThan"),
+        LESS_THAN("LessThan"),
 
-        GREATER_THAN(">", "GreaterThan"),
+        GREATER_THAN("GreaterThan"),
 
-        NOT_LIKE("not like", "NotLike"),
+        NOT_LIKE("NotLike"),
 
-        LIKE("like", "Like"),
+        LIKE("Like"),
 
-        NEGATING_SIMPLE_PROPERTY("<>", "Not"),
+        IN("In"),
 
-        SIMPLE_PROPERTY("=");
+        NEGATING_SIMPLE_PROPERTY("Not"),
+
+        SIMPLE_PROPERTY;
 
         // Need to list them again explicitly as the order is important
         // (esp. for IS_NULL, IS_NOT_NULL)
         private static final List<Part.Type> ALL = Arrays.asList(IS_NOT_NULL,
-                IS_NULL, BETWEEN, LESS_THAN, GREATER_THAN, NOT_LIKE, LIKE,
+                IS_NULL, BETWEEN, LESS_THAN, GREATER_THAN, NOT_LIKE, LIKE, IN,
                 NEGATING_SIMPLE_PROPERTY, SIMPLE_PROPERTY);
         private List<String> keywords;
-        private String operator;
         private int numberOfArguments;
 
 
@@ -166,17 +167,16 @@ public class Part {
          * @param numberOfArguments
          * @param keywords
          */
-        private Type(String operator, int numberOfArguments, String... keywords) {
+        private Type(int numberOfArguments, String... keywords) {
 
-            this.operator = operator;
             this.numberOfArguments = numberOfArguments;
             this.keywords = Arrays.asList(keywords);
         }
 
 
-        private Type(String operator, String... keywords) {
+        private Type(String... keywords) {
 
-            this(operator, 1, keywords);
+            this(1, keywords);
         }
 
 
@@ -202,12 +202,6 @@ public class Part {
         }
 
 
-        public String getOperator() {
-
-            return this.operator;
-        }
-
-
         /**
          * Returns whether the the type supports the given raw property. Default
          * implementation checks whether the property ends with the registered