[github-215] Improve Performance of OperandResolver#parseDouble. Thanks to Robert Wenzel. This closes #215

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1885651 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 4 insertions, 4 deletions

diff --git a/src/java/org/apache/poi/ss/formula/eval/OperandResolver.java b/src/java/org/apache/poi/ss/formula/eval/OperandResolver.java
index 162410f159..59a383c3e1 100644
--- a/src/java/org/apache/poi/ss/formula/eval/OperandResolver.java
+++ b/src/java/org/apache/poi/ss/formula/eval/OperandResolver.java
@@ -41,8 +41,8 @@ public final class OperandResolver {
                  "[+-]?(" +
                    "("+Digits+"(\\.)?("+Digits+"?)("+Exp+")?)|"+
                  "(\\."+Digits+"("+Exp+")?))"+
-                 "[\\x00-\\x20]*"); 
-            
+                 "[\\x00-\\x20]*");
+    private static final Pattern fpPattern = Pattern.compile(fpRegex);
     
     private OperandResolver() {
         // no instances of this class
@@ -291,8 +291,8 @@ public final class OperandResolver {
      * @return <code>null</code> if the specified text cannot be parsed as a number
      */
     public static Double parseDouble(String pText) {
-        
-        if (Pattern.matches(fpRegex, pText))
+
+        if (fpPattern.matcher(pText).matches())
             try {
                 return Double.parseDouble(pText);
             } catch (NumberFormatException e) {