More stringent Checkstyle rules (a la VFS).

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/codec/trunk@1352266 13f79535-47bb-0310-9956-ffa450edef68

Author: garydgregory

checkstyle.xml

@@ -22,17 +22,43 @@ limitations under the License.
 
 <!-- commons codec customization of default Checkstyle behavior -->
 <module name="Checker">
-  <property name="localeLanguage" value="en"/>
+  <property name="localeLanguage" value="en" />
+
+  <!-- Checks whether files end with a new line. -->
+  <!-- See http://checkstyle.sf.net/config_misc.html#NewlineAtEndOfFile -->
+  <module name="NewlineAtEndOfFile" />
 
   <!-- Verify that EVERY source file has the appropriate license -->
   <module name="Header">
-    <property name="headerFile" value="${checkstyle.header.file}"/>
+    <property name="headerFile" value="${checkstyle.header.file}" />
+  </module>
+
+  <!-- Checks for Tab characters -->
+  <!-- See http://checkstyle.sourceforge.net/config_whitespace.html#FileTabCharacter -->
+  <module name="FileTabCharacter">
+    <property name="fileExtensions" value="java" />
+  </module>
+
+  <!-- Checks for white space at the end of the line -->
+  <!-- See http://checkstyle.sourceforge.net/config_regexp.html -->
+  <module name="RegexpSingleline">
+    <property name="format" value="\s+$" />
+    <property name="message" value="Line has trailing spaces." />
+    <property name="fileExtensions" value="java" />
+  </module>
+
+  <!-- @author tags are deprecated -->
+  <module name="RegexpSingleline">
+    <property name="format" value="^\s+\*\s+@author\s" />
+    <property name="message" value="Deprecated @author tag" />
+    <property name="fileExtensions" value="java" />
+    <property name="severity" value="warning" />
   </module>
 
   <module name="TreeWalker">
-    <property name="cacheFile" value="target/cachefile"/>
+    <property name="cacheFile" value="target/cachefile" />
     <module name="OperatorWrap">
-      <property name="option" value="eol"/>
+      <property name="option" value="eol" />
     </module>
   </module>