[java] Fix false positive in UnusedImport

- When referencing static inner members of imports, false positives
would be reported.
 - Fixes #348

pmd-java/src/main/java/net/sourceforge/pmd/lang/java/rule/imports/UnusedImportsRule.java

@@ -86,7 +86,14 @@ public class UnusedImportsRule extends AbstractJavaRule {
                         if (s != null) {
                             String[] params = s.split("\\s*,\\s*");
                             for (String param : params) {
-                                imports.remove(new ImportWrapper(param, param, new DummyJavaNode(-1)));
+                                final int firstDot = param.indexOf('.');
+                                final String expectedImportName;
+                                if (firstDot == -1) {
+                                    expectedImportName = param;
+                                } else {
+                                    expectedImportName = param.substring(0, firstDot);
+                                }
+                                imports.remove(new ImportWrapper(param, expectedImportName, new DummyJavaNode(-1)));
                             }
                         }
                     }

pmd-java/src/test/resources/net/sourceforge/pmd/lang/java/rule/typeresolution/xml/UnusedImports.xml

@@ -261,6 +261,21 @@ public interface Interface {
 	 */
 	void doSomething();
 
+}
+        ]]></code>
+    </test-code>
+    <test-code>
+        <description>#348 False Positive UnusedImports with javadoc for public static inner classes of imports</description>
+        <expected-problems>0</expected-problems>
+        <code><![CDATA[
+import javax.swing.GroupLayout;
+
+public class Foo {
+
+	/**
+	 * {@link Bar#doSomething(GroupLayout.Group)}
+	*/
+	void doSomething();
 }
         ]]></code>
     </test-code>