[tomcat] 03/03: Add implementation comment

[ma...@apache.org]

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markt pushed a commit to branch main
in repository https://gitbox.apache.org/repos/asf/tomcat.git

commit 4b0392eec304a181332931c590feb75fb77ea39b
Author: Mark Thomas <ma...@apache.org>
AuthorDate: Thu Oct 6 14:02:45 2022 +0100

    Add implementation comment
---
 java/org/apache/catalina/ssi/ExpressionParseTree.java | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/java/org/apache/catalina/ssi/ExpressionParseTree.java b/java/org/apache/catalina/ssi/ExpressionParseTree.java
index a6b7afc9e7..c6bb29ffa6 100644
--- a/java/org/apache/catalina/ssi/ExpressionParseTree.java
+++ b/java/org/apache/catalina/ssi/ExpressionParseTree.java
@@ -35,12 +35,12 @@ public class ExpressionParseTree {
     private static final StringManager sm = StringManager.getManager(ExpressionParseTree.class);
     /**
      * Contains the current set of completed nodes. This is a workspace for the
-     * parser.
+     * parser. Needs to be LinkedList since it can contain {@code null}s.
      */
     private final LinkedList<Node> nodeStack = new LinkedList<>();
     /**
      * Contains operator nodes that don't yet have values. This is a workspace
-     * for the parser.
+     * for the parser. Needs to be LinkedList since it can contain {@code null}s.
      */
     private final LinkedList<OppNode> oppStack = new LinkedList<>();
     /**


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