From 3badd996bf40d25400ce40bf89aea92cd90b1b35 Mon Sep 17 00:00:00 2001
From: Rick Giles <rickgiles>
Date: Wed, 25 Dec 2002 13:07:08 +0000
Subject: [PATCH] performance improvement - eliminate multiple instance
 creation for context HashMap. Still at the top of the performance list of
 Checkstyle non-parsing methods.

---
 .../com/puppycrawl/tools/checkstyle/TreeWalker.java         | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/checkstyle/com/puppycrawl/tools/checkstyle/TreeWalker.java b/src/checkstyle/com/puppycrawl/tools/checkstyle/TreeWalker.java
index 5fe38d4c4..00ca51e96 100644
--- a/src/checkstyle/com/puppycrawl/tools/checkstyle/TreeWalker.java
+++ b/src/checkstyle/com/puppycrawl/tools/checkstyle/TreeWalker.java
@@ -118,6 +118,8 @@ public final class TreeWalker
 
     /** context of child components */
     private Context mChildContext;
+    
+    private Map mContext = new HashMap();
 
     /**
      * HACK - a reference to a private "mParent" field in DetailAST.
@@ -439,10 +441,10 @@ public final class TreeWalker
             (ArrayList) mTokenToChecks.get(
                 TokenTypes.getTokenName(aAST.getType()));
         if (visitors != null) {
-            final Map ctx = new HashMap();
+            mContext.clear();
             for (int i = 0; i < visitors.size(); i++) {
                 final Check check = (Check) visitors.get(i);
-                check.setTokenContext(ctx);
+                check.setTokenContext(mContext);
                 check.visitToken(aAST);
             }
         }