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8200310: Avoid charset lookup machinery in java.nio.charset.StandardCharsets

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Reviewed-by: sherman, ulfzibis
This commit is contained in:
Martin Buchholz 2018-03-28 21:14:06 -07:00
parent 08adfe31b3
commit 4546512c19
11 changed files with 31 additions and 30 deletions
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7
src/java.base/share/classes/java/lang/StringCoding.java
View file

@ -52,6 +52,9 @@ import static java.lang.Character.highSurrogate;
import static java.lang.Character.lowSurrogate;
import static java.lang.Character.isSupplementaryCodePoint;
import static java.lang.StringUTF16.putChar;
import static java.nio.charset.StandardCharsets.ISO_8859_1;
import static java.nio.charset.StandardCharsets.US_ASCII;
import static java.nio.charset.StandardCharsets.UTF_8;
/**
* Utility class for string encoding and decoding.
@ -67,10 +70,6 @@ class StringCoding {
private static final ThreadLocal<SoftReference<StringEncoder>> encoder =
new ThreadLocal<>();
private static final Charset ISO_8859_1 = sun.nio.cs.ISO_8859_1.INSTANCE;
private static final Charset US_ASCII = sun.nio.cs.US_ASCII.INSTANCE;
private static final Charset UTF_8 = sun.nio.cs.UTF_8.INSTANCE;
private static <T> T deref(ThreadLocal<SoftReference<T>> tl) {
SoftReference<T> sr = tl.get();
if (sr == null)

6
src/java.base/share/classes/java/nio/charset/Charset.java
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@ -26,7 +26,6 @@
package java.nio.charset;
import jdk.internal.misc.VM;
import sun.nio.cs.StandardCharsets;
import sun.nio.cs.ThreadLocalCoders;
import sun.security.action.GetPropertyAction;
@ -311,7 +310,8 @@ public abstract class Charset
}
/* The standard set of charsets */
private static final CharsetProvider standardProvider = new StandardCharsets();
private static final CharsetProvider standardProvider
= new sun.nio.cs.StandardCharsets();
private static final String[] zeroAliases = new String[0];
@ -609,7 +609,7 @@ public abstract class Charset
if (cs != null)
defaultCharset = cs;
else
defaultCharset = sun.nio.cs.UTF_8.INSTANCE;
defaultCharset = StandardCharsets.UTF_8;
}
}
return defaultCharset;

12
src/java.base/share/classes/java/nio/charset/StandardCharsets.java
View file

@ -41,26 +41,26 @@ public final class StandardCharsets {
* Seven-bit ASCII, a.k.a. ISO646-US, a.k.a. the Basic Latin block of the
* Unicode character set
*/
public static final Charset US_ASCII = sun.nio.cs.US_ASCII.INSTANCE;
public static final Charset US_ASCII = new sun.nio.cs.US_ASCII();
/**
* ISO Latin Alphabet No. 1, a.k.a. ISO-LATIN-1
*/
public static final Charset ISO_8859_1 = sun.nio.cs.ISO_8859_1.INSTANCE;
public static final Charset ISO_8859_1 = new sun.nio.cs.ISO_8859_1();
/**
* Eight-bit UCS Transformation Format
*/
public static final Charset UTF_8 = sun.nio.cs.UTF_8.INSTANCE;
public static final Charset UTF_8 = new sun.nio.cs.UTF_8();
/**
* Sixteen-bit UCS Transformation Format, big-endian byte order
*/
public static final Charset UTF_16BE = Charset.forName("UTF-16BE");
public static final Charset UTF_16BE = new sun.nio.cs.UTF_16BE();
/**
* Sixteen-bit UCS Transformation Format, little-endian byte order
*/
public static final Charset UTF_16LE = Charset.forName("UTF-16LE");
public static final Charset UTF_16LE = new sun.nio.cs.UTF_16LE();
/**
* Sixteen-bit UCS Transformation Format, byte order identified by an
* optional byte-order mark
*/
public static final Charset UTF_16 = Charset.forName("UTF-16");
public static final Charset UTF_16 = new sun.nio.cs.UTF_16();
}

3
src/java.base/share/classes/sun/nio/cs/ISO_8859_1.java
View file

@ -39,9 +39,6 @@ public class ISO_8859_1
extends Charset
implements HistoricallyNamedCharset
{
public static final ISO_8859_1 INSTANCE = new ISO_8859_1();
public ISO_8859_1() {
super("ISO-8859-1", StandardCharsets.aliases_ISO_8859_1());
}

15
src/java.base/share/classes/sun/nio/cs/StandardCharsets.java.template
View file

@ -83,9 +83,12 @@ public class StandardCharsets extends CharsetProvider {
Map<String,Charset> map = cache;
if (map == null) {
map = new Cache();
map.put("utf-8", UTF_8.INSTANCE);
map.put("iso-8859-1", ISO_8859_1.INSTANCE);
map.put("us-ascii", US_ASCII.INSTANCE);
map.put("utf-8", java.nio.charset.StandardCharsets.UTF_8);
map.put("iso-8859-1", java.nio.charset.StandardCharsets.ISO_8859_1);
map.put("us-ascii", java.nio.charset.StandardCharsets.US_ASCII);
map.put("utf-16", java.nio.charset.StandardCharsets.UTF_16);
map.put("utf-16be", java.nio.charset.StandardCharsets.UTF_16BE);
map.put("utf-16le", java.nio.charset.StandardCharsets.UTF_16LE);
cache = map;
}
return map;
@ -123,11 +126,11 @@ public class StandardCharsets extends CharsetProvider {
// Classes eagerly during bootstrap
String csn;
if (charsetName.equals("UTF-8")) {
return UTF_8.INSTANCE;
return java.nio.charset.StandardCharsets.UTF_8;
} else if (charsetName.equals("US-ASCII")) {
return US_ASCII.INSTANCE;
return java.nio.charset.StandardCharsets.US_ASCII;
} else if (charsetName.equals("ISO-8859-1")) {
return ISO_8859_1.INSTANCE;
return java.nio.charset.StandardCharsets.ISO_8859_1;
} else {
csn = canonicalize(toLower(charsetName));
}

2
src/java.base/share/classes/sun/nio/cs/US_ASCII.java
View file

@ -36,8 +36,6 @@ public class US_ASCII
extends Charset
implements HistoricallyNamedCharset
{
public static final US_ASCII INSTANCE = new US_ASCII();
public US_ASCII() {
super("US-ASCII", StandardCharsets.aliases_US_ASCII());
}

2
src/java.base/share/classes/sun/nio/cs/UTF_16.java
View file

@ -29,7 +29,7 @@ import java.nio.charset.Charset;
import java.nio.charset.CharsetDecoder;
import java.nio.charset.CharsetEncoder;
class UTF_16 extends Unicode
public class UTF_16 extends Unicode
{
public UTF_16() {

2
src/java.base/share/classes/sun/nio/cs/UTF_16BE.java
View file

@ -29,7 +29,7 @@ import java.nio.charset.Charset;
import java.nio.charset.CharsetDecoder;
import java.nio.charset.CharsetEncoder;
class UTF_16BE extends Unicode
public class UTF_16BE extends Unicode
{
public UTF_16BE() {

2
src/java.base/share/classes/sun/nio/cs/UTF_16LE.java
View file

@ -29,7 +29,7 @@ import java.nio.charset.Charset;
import java.nio.charset.CharsetDecoder;
import java.nio.charset.CharsetEncoder;
class UTF_16LE extends Unicode
public class UTF_16LE extends Unicode
{
public UTF_16LE() {

3
src/java.base/share/classes/sun/nio/cs/UTF_8.java
View file

@ -55,9 +55,6 @@ import java.nio.charset.CodingErrorAction;
*/
public final class UTF_8 extends Unicode {
public static final UTF_8 INSTANCE = new UTF_8();
public UTF_8() {
super("UTF-8", StandardCharsets.aliases_UTF_8());
}

7
test/jdk/java/nio/charset/StandardCharsets/Standard.java
View file

@ -58,6 +58,13 @@ public class Standard {
check("UTF-16LE".equals(StandardCharsets.UTF_16LE.name()));
check("UTF-16".equals(StandardCharsets.UTF_16.name()));
check(Charset.forName("US-ASCII") == StandardCharsets.US_ASCII);
check(Charset.forName("ISO-8859-1") == StandardCharsets.ISO_8859_1);
check(Charset.forName("UTF-8") == StandardCharsets.UTF_8);
check(Charset.forName("UTF-16BE") == StandardCharsets.UTF_16BE);
check(Charset.forName("UTF-16LE") == StandardCharsets.UTF_16LE);
check(Charset.forName("UTF-16") == StandardCharsets.UTF_16);
Set<String> charsets = new HashSet<>();
Field standardCharsetFields[] = StandardCharsets.class.getFields();