Perform clean code of e4tools/bundles/org.eclipse.e4.tools.emf.ui

Author: eclipse-pde-bot

e4tools/bundles/org.eclipse.e4.tools.emf.ui/src/org/eclipse/e4/tools/emf/ui/internal/common/resourcelocator/TargetPlatformContributionCollector.java

@@ -91,7 +91,7 @@ public abstract class TargetPlatformContributionCollector extends ClassContribut
 	HashSet<String> cacheBundleId = new HashSet<>();
 	HashSet<String> cachePackage = new HashSet<>();
 	HashSet<String> cacheLocation = new HashSet<>();
-	private Pattern patternFile;
+	private final Pattern patternFile;
 	protected String cacheName;
 	protected boolean stopFiltering;