@return the transformed object
@param object the object to transform
@description transforms a key.the transformer itself may throw an exception if necessary.
the transformer itself may throw an exception if necessary.
file : https_github_com_apache_commons-collections_git/src/main/java/org/apache/commons/collections4/splitmap/TransformedSplitMap.java
file : https_github_com_apache_commons-collections_git/src/main/java/org/apache/commons/collections4/multimap/TransformedMultiValuedMap.java
file : https_github_com_apache_commons-collections_git/src/main/java/org/apache/commons/collections4/map/TransformedMap.java