From 1bc86e4d7c41c8e637b408ae7307e351208692ab Mon Sep 17 00:00:00 2001
From: Rikard Pavelic <rikard@ngs.hr>
Date: Sun, 7 Apr 2019 17:22:03 +0200
Subject: [PATCH] Lazy allocate NamespaceMappings

This greatly reduces the memory usage while doing transform to output stream.
---
 src/org/apache/xalan/xsltc/trax/DOM2TO.java | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/org/apache/xalan/xsltc/trax/DOM2TO.java b/src/org/apache/xalan/xsltc/trax/DOM2TO.java
index 705dc34fa..dd52b1293 100644
--- a/src/org/apache/xalan/xsltc/trax/DOM2TO.java
+++ b/src/org/apache/xalan/xsltc/trax/DOM2TO.java
@@ -160,7 +160,7 @@ private void parse(Node node)
 	    }
             
 	    // Process all non-namespace attributes next
-            NamespaceMappings nm = new NamespaceMappings();
+            NamespaceMappings nm = null;
 	    for (int i = 0; i < length; i++) {
 		final Node attr = map.item(i);
 		final String qnameAttr = attr.getNodeName();
@@ -176,6 +176,7 @@ private void parse(Node node)
                         // For attributes not given an prefix explictly
                         // but having a namespace uri we need
                         // to explicitly generate the prefix
+                        if (nm == null) nm = new NamespaceMappings();
                         String newPrefix = nm.lookupPrefix(uriAttr);
                         if (newPrefix == null) 
                             newPrefix = nm.generateNextPrefix();