Merge branch 'faster-symboltable' of https://github.com/Monits/pmd into pr-333

pmd-java/src/main/java/net/sourceforge/pmd/lang/java/symboltable/SourceFileScope.java

@@ -26,6 +26,7 @@ public class SourceFileScope extends AbstractJavaScope {
 
     private final String packageImage;
     private final TypeSet types;
+    private Map<String, Node> qualifiedTypeNames;
 
     public SourceFileScope(final ClassLoader classLoader) {
         this(classLoader, "");
@@ -136,7 +137,12 @@ public class SourceFileScope extends AbstractJavaScope {
      * @return set of all types in this source file.
      */
     public Map<String, Node> getQualifiedTypeNames() {
-        return getSubTypes(null, this);
+        if (qualifiedTypeNames != null) {
+            return qualifiedTypeNames;
+        }
+
+        qualifiedTypeNames = getSubTypes(null, this);
+        return qualifiedTypeNames;
     }
 
     private Map<String, Node> getSubTypes(String qualifyingName, Scope subType) {

src/site/markdown/overview/changelog.md

@@ -20,7 +20,7 @@ than a 50% speedup). Future releases will keep improving on this area.
 Once again, *Symbol Table* has been an area of great performance improvements.
 This time we were able to further improve it's performance by roughly 10% on all
 supported languages. In *Java* in particular, several more improvements were possible,
-improving *Symbol Table* performance by a whooping 30%, that's over 5X faster
+improving *Symbol Table* performance by a whooping 80%, that's over 15X faster
 than PMD 5.5.1, when we first started working on it.
 
 Java developers will also appreciate the revamp of `CloneMethodMustImplementCloneable`,