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Optimize StringSequence.startsWith #21259

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Optimize StringSequence.startsWith #21259

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12 changes: 8 additions & 4 deletions .../spring-boot-loader/src/main/java/org/springframework/boot/loader/jar/StringSequence.java
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Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
/*
* Copyright 2012-2019 the original author or authors.
* Copyright 2012-2020 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
Expand Down Expand Up @@ -98,15 +98,19 @@ int indexOf(String str, int fromIndex) {
return this.source.indexOf(str, this.start + fromIndex) - this.start;
}

boolean startsWith(CharSequence prefix) {
boolean startsWith(String prefix) {
return startsWith(prefix, 0);
}

boolean startsWith(CharSequence prefix, int offset) {
boolean startsWith(String prefix, int offset) {
int prefixLength = prefix.length();
if (length() - prefixLength - offset < 0) {
int length = length();
if (length - prefixLength - offset < 0) {
return false;
}
if (length == this.source.length()) {
return this.source.startsWith(prefix, offset);
}
int prefixOffset = 0;
int sourceOffset = offset;
while (prefixLength-- != 0) {
Expand Down