Removed useless call to String.valueOf.


git-svn-id: https://svn.apache.org/repos/asf/sis/branches/JDK8@1639969 13f79535-47bb-0310-9956-ffa450edef68
Added an AbstractMap with slightly different assumptions and implementation strategy than java.util.AbstractMap.
This is strictly for internal usages, only in some specific cases, and shall be invisible to users.


git-svn-id: https://svn.apache.org/repos/asf/sis/branches/JDK8@1639970 13f79535-47bb-0310-9956-ffa450edef68
First draft of DefaultAttribute.characteristics() method.


git-svn-id: https://svn.apache.org/repos/asf/sis/branches/JDK8@1639971 13f79535-47bb-0310-9956-ffa450edef68