Don't double quote already quoted identifiers. fixes patch 18

git-svn-id: https://svn.code.sf.net/p/jackcess/code/jackcess/trunk@901 f203690c-595d-4dc9-a70b-905162fa7fd2

pom.xml

         <role>Contributed to cookbook.</role>
       </roles>
     </contributor>
+    <contributor>
+      <name>Gabriele Favalessa</name>
+      <roles>
+        <role>Fixed various query generation issues.</role>
+      </roles>
+    </contributor>
   </contributors>
   <issueManagement>
     <system>SourceForge2</system>

src/changes/changes.xml

       <action dev="jahlborn" type="fix" system="SourceForge2Patches" issue="17">
         Fix table name quoting for append and make table queries.
       </action>
+      <action dev="jahlborn" type="fix" system="SourceForge2Patches" issue="18">
+        Don't double quote already quoted identifiers.
+      </action>
     </release>
     <release version="2.0.7" date="2014-11-22">
       <action dev="jahlborn" type="fix" system="SourceForge2" issue="111">

src/main/java/com/healthmarketscience/jackcess/impl/query/QueryImpl.java

   protected static StringBuilder toQuotedExpr(StringBuilder builder, 
                                               String expr)
   {
-    return builder.append('[').append(expr).append(']');
+    return (!isQuoted(expr) ? 
+            builder.append('[').append(expr).append(']') :
+            builder.append(expr));
+  }
+
+  protected static boolean isQuoted(String expr) {
+    return ((expr.length() >= 2) && 
+            (expr.charAt(0) == '[') && (expr.charAt(expr.length() - 1) == ']'));
   }
 
   protected static StringBuilder toRemoteDb(StringBuilder builder,

src/test/java/com/healthmarketscience/jackcess/query/QueryTest.java

           "UpdateQuery",multiline(
               "PARAMETERS User Name Text;",
               "UPDATE Table1",
-              "SET Table1.col1 = \"foo\", Table1.col2 = [Table2].[col3], [[Table2]].[[col1]] = [User Name]",
+              "SET Table1.col1 = \"foo\", Table1.col2 = [Table2].[col3], [Table2].[col1] = [User Name]",
               "WHERE ((([Table2].[col1]) Is Not Null));"));
       expectedQueries.put(
           "MakeTableQuery",multiline(