Add LdapClient

Closes gh-675

Author: jzheaux

core/src/main/java/org/springframework/ldap/core/ContextMapper.java

@@ -64,4 +64,6 @@ public interface ContextMapper<T> {
 	 * @throws NamingException if an error occurs.
 	 */
 	T mapFromContext(Object ctx) throws NamingException;
+
+	ContextMapper<DirContextOperations> DEFAULT = (ctx) -> (DirContextOperations) ctx;
 }

core/src/main/java/org/springframework/ldap/core/DirContextAdapter.java

@@ -106,7 +106,7 @@ public class DirContextAdapter implements DirContextOperations {
 
 	private static Logger log = LoggerFactory.getLogger(DirContextAdapter.class);
 
-	private final NameAwareAttributes originalAttrs;
+	private NameAwareAttributes originalAttrs;
 
 	private LdapName dn;
 
@@ -804,6 +804,14 @@ public SortedSet<String> getAttributeSortedStringSet(String name) {
 		}
 	}
 
+	void setAttributes(Attributes attributes) {
+		if (!updateMode) {
+			originalAttrs = new NameAwareAttributes(attributes);
+		} else {
+			updatedAttrs = new NameAwareAttributes(attributes);
+		}
+	}
+
 	/**
 	 * Set the supplied attribute.
 	 *