More Immutable classes

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk@756298 13f79535-47bb-0310-9956-ffa450edef68

httpclient/src/main/java/org/apache/http/impl/cookie/DateUtils.java

@@ -41,6 +41,8 @@ import java.util.Locale;
 import java.util.Map;
 import java.util.TimeZone;
 
+import net.jcip.annotations.Immutable;
+
 /**
  * A utility class for parsing and formatting HTTP dates as used in cookies and 
  * other headers.  This class handles dates as defined by RFC 2616 section 
@@ -49,6 +51,7 @@ import java.util.TimeZone;
  *
  * @since 4.0
  */
+@Immutable
 public final class DateUtils {
 
     /**

httpclient/src/main/java/org/apache/http/impl/cookie/RFC2109Spec.java

@@ -35,6 +35,8 @@ import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
 
+import net.jcip.annotations.Immutable;
+
 import org.apache.http.Header;
 import org.apache.http.HeaderElement;
 import org.apache.http.cookie.ClientCookie;
@@ -52,7 +54,7 @@ import org.apache.http.util.CharArrayBuffer;
  * 
  * @since 4.0 
  */
-
+@Immutable
 public class RFC2109Spec extends CookieSpecBase {
 
     private final static CookiePathComparator PATH_COMPARATOR = new CookiePathComparator(); 

httpclient/src/main/java/org/apache/http/impl/cookie/RFC2965VersionAttributeHandler.java

@@ -31,6 +31,8 @@
 
 package org.apache.http.impl.cookie;
 
+import net.jcip.annotations.Immutable;
+
 import org.apache.http.cookie.ClientCookie;
 import org.apache.http.cookie.Cookie;
 import org.apache.http.cookie.CookieAttributeHandler;
@@ -44,6 +46,7 @@ import org.apache.http.cookie.SetCookie2;
  *
  * @since 4.0
  */
+@Immutable
 public class RFC2965VersionAttributeHandler implements CookieAttributeHandler {
 
     public RFC2965VersionAttributeHandler() {