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Merge pull request #15473 from dreis2211 

* pr/15473:
  Optimize StringSequence
This commit is contained in:
Stephane Nicoll 2018-12-20 17:59:19 +01:00
parent 0741c90489 27e89bbb8a
commit 8d0ad03b6d
1 changed files with 13 additions and 2 deletions
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15
spring-boot-project/spring-boot-tools/spring-boot-loader/src/main/java/org/springframework/boot/loader/jar/StringSequence.java
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@ -66,6 +66,9 @@ final class StringSequence implements CharSequence {
if (subSequenceEnd > this.end) { if (subSequenceEnd > this.end) {
throw new StringIndexOutOfBoundsException(end); throw new StringIndexOutOfBoundsException(end);
} }
if (start == 0 && subSequenceEnd == this.end) {
return this;
}
return new StringSequence(this.source, subSequenceStart, subSequenceEnd); return new StringSequence(this.source, subSequenceStart, subSequenceEnd);
} }
@ -100,10 +103,18 @@ final class StringSequence implements CharSequence {
} }
public boolean startsWith(CharSequence prefix, int offset) { public boolean startsWith(CharSequence prefix, int offset) {
if (length() - prefix.length() - offset < 0) { int prefixLength = prefix.length();
if (length() - prefixLength - offset < 0) {
return false; return false;
} }
return subSequence(offset, offset + prefix.length()).equals(prefix); int prefixOffset = 0;
int sourceOffset = offset;
while (prefixLength-- != 0) {
if (charAt(sourceOffset++) != prefix.charAt(prefixOffset++)) {
return false;
}
}
return true;
} }
@Override @Override