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classlib: improve performance of several String methods

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This commit is contained in:
Alexey Andreev 2023-06-07 11:22:01 +02:00
parent cb67595f5b
commit 9dd9fc3a8a
1 changed files with 41 additions and 23 deletions
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64
classlib/src/main/java/org/teavm/classlib/java/lang/TString.java
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@ -15,7 +15,6 @@
*/
package org.teavm.classlib.java.lang;
import java.util.Iterator;
import java.util.Locale;
import org.teavm.backend.javascript.spi.GeneratedBy;
import org.teavm.classlib.java.io.TSerializable;
@ -33,12 +32,14 @@ import org.teavm.dependency.PluggableDependency;
import org.teavm.interop.NoSideEffects;
public class TString extends TObject implements TSerializable, TComparable<TString>, TCharSequence {
private static final char[] EMPTY_CHARS = new char[0];
private static final TString EMPTY = new TString();
public static final TComparator<TString> CASE_INSENSITIVE_ORDER = (o1, o2) -> o1.compareToIgnoreCase(o2);
private char[] characters;
private transient int hashCode;
public TString() {
this.characters = new char[0];
this.characters = EMPTY_CHARS;
}
public TString(TString other) {
@ -59,6 +60,12 @@ public class TString extends TObject implements TSerializable, TComparable<TStri
}
}
static TString fromArray(char[] characters) {
var s = new TString();
s.characters = characters;
return s;
}
public TString(byte[] bytes, int offset, int length, TString charsetName) throws TUnsupportedEncodingException {
this(bytes, offset, length, TCharset.forName(charsetName.toString()));
}
@ -157,7 +164,6 @@ public class TString extends TObject implements TSerializable, TComparable<TStri
}
public boolean isBlank() {
for (int i = 0; i < characters.length; i++) {
if (characters[i] != ' ') {
return false;
@ -392,6 +398,12 @@ public class TString extends TObject implements TSerializable, TComparable<TStri
if (beginIndex > endIndex) {
throw new TIndexOutOfBoundsException();
}
if (beginIndex == endIndex) {
return EMPTY;
}
if (beginIndex == 0 && endIndex == length()) {
return this;
}
return new TString(characters, beginIndex, endIndex - beginIndex);
}
@ -408,7 +420,11 @@ public class TString extends TObject implements TSerializable, TComparable<TStri
if (str.isEmpty()) {
return this;
}
char[] buffer = new char[length() + str.length()];
if (isEmpty()) {
return str;
}
var buffer = new char[length() + str.length()];
int index = 0;
for (int i = 0; i < length(); ++i) {
buffer[index++] = charAt(i);
@ -416,18 +432,18 @@ public class TString extends TObject implements TSerializable, TComparable<TStri
for (int i = 0; i < str.length(); ++i) {
buffer[index++] = str.charAt(i);
}
return new TString(buffer);
return TString.fromArray(buffer);
}
public TString replace(char oldChar, char newChar) {
if (oldChar == newChar) {
return this;
}
char[] buffer = new char[length()];
var buffer = new char[length()];
for (int i = 0; i < length(); ++i) {
buffer[i] = charAt(i) == oldChar ? newChar : charAt(i);
}
return new TString(buffer);
return TString.fromArray(buffer);
}
public boolean contains(TCharSequence s) {
@ -445,7 +461,7 @@ public class TString extends TObject implements TSerializable, TComparable<TStri
}
public String replace(TCharSequence target, TCharSequence replacement) {
StringBuilder sb = new StringBuilder();
var sb = new StringBuilder();
int sz = length() - target.length();
int i = 0;
outer:
@ -706,19 +722,19 @@ public class TString extends TObject implements TSerializable, TComparable<TStri
return new TFormatter(l).format(format, args).toString();
}
public static String join(CharSequence delimiter, CharSequence... elements) {
public static TString join(CharSequence delimiter, CharSequence... elements) {
if (elements.length == 0) {
return "";
return EMPTY;
}
int resultLength = 0;
for (CharSequence element : elements) {
for (var element : elements) {
resultLength += element.length();
}
resultLength += (elements.length - 1) * delimiter.length();
char[] chars = new char[resultLength];
var chars = new char[resultLength];
int index = 0;
CharSequence firstElement = elements[0];
var firstElement = elements[0];
for (int i = 0; i < firstElement.length(); ++i) {
chars[index++] = firstElement.charAt(i);
}
@ -726,22 +742,22 @@ public class TString extends TObject implements TSerializable, TComparable<TStri
for (int j = 0; j < delimiter.length(); ++j) {
chars[index++] = delimiter.charAt(j);
}
CharSequence element = elements[i];
var element = elements[i];
for (int j = 0; j < element.length(); ++j) {
chars[index++] = element.charAt(j);
}
}
return new String(chars);
return TString.fromArray(chars);
}
public static String join(CharSequence delimiter, Iterable<? extends CharSequence> elements) {
Iterator<? extends CharSequence> iter = elements.iterator();
var iter = elements.iterator();
if (!iter.hasNext()) {
return "";
}
StringBuilder sb = new StringBuilder();
var sb = new StringBuilder();
sb.append(iter.next());
while (iter.hasNext()) {
sb.append(delimiter);
@ -750,20 +766,22 @@ public class TString extends TObject implements TSerializable, TComparable<TStri
return sb.toString();
}
public String repeat(int count) {
public TString repeat(int count) {
if (count < 0) {
throw new IllegalArgumentException();
}
if (count == 1) {
return this.toString();
return this;
}
if (characters.length == 0 || count == 0) {
return "";
return EMPTY;
}
TStringBuilder builder = new TStringBuilder(characters.length * count);
var chars = new char[characters.length * count];
var j = 0;
for (int i = 0; i < count; i++) {
builder.append(this.toString());
getChars(0, length(), chars, j);
j += length();
}
return builder.toString();
return TString.fromArray(chars);
}
}