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Avoid temporary String creation in StringUtils.starts/endsWithIgnoreCase

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Issue: SPR-16095
This commit is contained in:
Juergen Hoeller
2017-10-22 14:31:17 +02:00
parent 9a88ebdeba
commit 5d41e0f012
2 changed files with 60 additions and 48 deletions
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41
spring-core/src/main/java/org/springframework/util/StringUtils.java
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@@ -164,7 +164,7 @@ public abstract class StringUtils {
}
}
return false;
}
}
/**
* Check whether the given {@code CharSequence} contains any whitespace characters.
@@ -314,7 +314,6 @@ public abstract class StringUtils {
return sb.toString();
}
/**
* Test if the given {@code String} starts with the specified prefix,
* ignoring upper/lower case.
@@ -323,19 +322,8 @@ public abstract class StringUtils {
* @see java.lang.String#startsWith
*/
public static boolean startsWithIgnoreCase(@Nullable String str, @Nullable String prefix) {
if (str == null || prefix == null) {
return false;
}
if (str.startsWith(prefix)) {
return true;
}
if (str.length() < prefix.length()) {
return false;
}
String lcStr = str.substring(0, prefix.length()).toLowerCase();
String lcPrefix = prefix.toLowerCase();
return lcStr.equals(lcPrefix);
return (str != null && prefix != null && str.length() >= prefix.length() &&
str.regionMatches(true, 0, prefix, 0, prefix.length()));
}
/**
@@ -346,19 +334,8 @@ public abstract class StringUtils {
* @see java.lang.String#endsWith
*/
public static boolean endsWithIgnoreCase(@Nullable String str, @Nullable String suffix) {
if (str == null || suffix == null) {
return false;
}
if (str.endsWith(suffix)) {
return true;
}
if (str.length() < suffix.length()) {
return false;
}
String lcStr = str.substring(str.length() - suffix.length()).toLowerCase();
String lcSuffix = suffix.toLowerCase();
return lcStr.equals(lcSuffix);
return (str != null && suffix != null && str.length() >= suffix.length() &&
str.regionMatches(true, str.length() - suffix.length(), suffix, 0, suffix.length()));
}
/**
@@ -369,9 +346,11 @@ public abstract class StringUtils {
* @param substring the substring to match at the given index
*/
public static boolean substringMatch(CharSequence str, int index, CharSequence substring) {
for (int j = 0; j < substring.length(); j++) {
int i = index + j;
if (i >= str.length() || str.charAt(i) != substring.charAt(j)) {
if (index + substring.length() > str.length()) {
return false;
}
for (int i = 0; i < substring.length(); i++) {
if (str.charAt(index + i) != substring.charAt(i)) {
return false;
}
}