From f9e50b62a2e0670c3856e10a24744e877a266474 Mon Sep 17 00:00:00 2001
From: Rob Stryker <stryker@redhat.com>
Date: Wed, 27 Nov 2024 15:34:28 -0500
Subject: [PATCH] Speed improvement in test classes. May contribute to upstream

Signed-off-by: Rob Stryker <stryker@redhat.com>
---
 .../jdt/core/compiler/CharOperation.java      | 51 ++-----------------
 1 file changed, 4 insertions(+), 47 deletions(-)

diff --git a/org.eclipse.jdt.core.compiler.batch/src/org/eclipse/jdt/core/compiler/CharOperation.java b/org.eclipse.jdt.core.compiler.batch/src/org/eclipse/jdt/core/compiler/CharOperation.java
index 5933dbd1958..1b27107d4ec 100644
--- a/org.eclipse.jdt.core.compiler.batch/src/org/eclipse/jdt/core/compiler/CharOperation.java
+++ b/org.eclipse.jdt.core.compiler.batch/src/org/eclipse/jdt/core/compiler/CharOperation.java
@@ -3738,55 +3738,12 @@ public static final char[] replace(
 	char[] toBeReplaced,
 	char[] replacementChars) {
 
-	int max = array.length;
-	int replacedLength = toBeReplaced.length;
-	int replacementLength = replacementChars.length;
-
-	int[] starts = new int[5];
-	int occurrenceCount = 0;
-
-	if (!equals(toBeReplaced, replacementChars)) {
-
-		next : for (int i = 0; i < max;) {
-			int index = indexOf(toBeReplaced, array, true, i);
-			if (index == -1) {
-				i++;
-				continue next;
-			}
-			if (occurrenceCount == starts.length) {
-				System.arraycopy(
-					starts,
-					0,
-					starts = new int[occurrenceCount * 2],
-					0,
-					occurrenceCount);
-			}
-			starts[occurrenceCount++] = index;
-			i = index + replacedLength;
-		}
-	}
-	if (occurrenceCount == 0)
+	String s1 = new String(array);
+	String myRet = s1.replace(new String(toBeReplaced), new String(replacementChars));
+	if( myRet.equals(s1)) {
 		return array;
-	char[] result =
-		new char[max
-			+ occurrenceCount * (replacementLength - replacedLength)];
-	int inStart = 0, outStart = 0;
-	for (int i = 0; i < occurrenceCount; i++) {
-		int offset = starts[i] - inStart;
-		System.arraycopy(array, inStart, result, outStart, offset);
-		inStart += offset;
-		outStart += offset;
-		System.arraycopy(
-			replacementChars,
-			0,
-			result,
-			outStart,
-			replacementLength);
-		inStart += replacedLength;
-		outStart += replacementLength;
 	}
-	System.arraycopy(array, inStart, result, outStart, max - inStart);
-	return result;
+	return myRet.toCharArray();
 }
 
 /**