8272805: Avoid looking up standard charsets

Reviewed-by: weijun, naoto, dfuchs, azvegint, erikj

make/jdk/src/classes/build/tools/generatelsrequivmaps/EquivMapsGenerator.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2012, 2020, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2012, 2021, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -27,7 +27,6 @@
 
 import java.io.BufferedWriter;
 import java.io.IOException;
-import java.nio.charset.Charset;
 import java.nio.file.Files;
 import java.nio.file.Paths;
 import java.time.ZoneId;
@@ -79,8 +78,7 @@ private static void readLSRfile(String filename) throws Exception {
         String preferred = null;
         String prefix = null;
 
-        for (String line : Files.readAllLines(Paths.get(filename),
-                                              Charset.forName("UTF-8"))) {
+        for (String line : Files.readAllLines(Paths.get(filename))) {
             line = line.toLowerCase(Locale.ROOT);
             int index = line.indexOf(' ') + 1;
             if (line.startsWith("file-date:")) {

src/demo/share/jfc/Font2DTest/Font2DTest.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1999, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1999, 2021, Oracle and/or its affiliates. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -72,6 +72,8 @@
 import javax.swing.*;
 import javax.swing.event.*;
 
+import static java.nio.charset.StandardCharsets.UTF_16;
+
 /**
  * Font2DTest.java
  *
@@ -589,7 +591,7 @@ private void readTextFile( String fileName ) {
             if (numBytes >= 2 &&
                 (( byteData[0] == (byte) 0xFF && byteData[1] == (byte) 0xFE ) ||
                  ( byteData[0] == (byte) 0xFE && byteData[1] == (byte) 0xFF )))
-              fileText = new String( byteData, "UTF-16" );
+              fileText = new String(byteData, UTF_16);
             /// Otherwise, use system default encoding
             else
               fileText = new String( byteData );
@@ -647,7 +649,7 @@ private void writeCurrentOptions( String fileName ) {
                 showFontInfoCBMI.getState() + "\n" +
                 rm.getSelectedItem() + "\n" +
                 range[0] + "\n" + range[1] + "\n" + curOptions + tFileName);
-            byte[] toBeWritten = completeOptions.getBytes( "UTF-16" );
+            byte[] toBeWritten = completeOptions.getBytes(UTF_16);
             bos.write( toBeWritten, 0, toBeWritten.length );
             bos.close();
         }
@@ -712,7 +714,7 @@ private void loadOptions( String fileName ) {
                 (byteData[0] != (byte) 0xFE || byteData[1] != (byte) 0xFF) )
               throw new Exception( "Not a Font2DTest options file" );
 
-            String options = new String( byteData, "UTF-16" );
+            String options = new String(byteData, UTF_16);
             StringTokenizer perLine = new StringTokenizer( options, "\n" );
             String title = perLine.nextToken();
             if ( !title.equals( "Font2DTest Option File" ))

src/demo/share/jfc/Font2DTest/FontPanel.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2000, 2021, Oracle and/or its affiliates. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -80,6 +80,7 @@
 import javax.swing.*;
 
 import static java.awt.RenderingHints.*;
+import static java.nio.charset.StandardCharsets.ISO_8859_1;
 
 /**
  * FontPanel.java
@@ -643,7 +644,7 @@ private void modeSpecificDrawLine( Graphics2D g2, String line,
                 break;
               case DRAW_BYTES:
                 try {
-                    byte[] lineBytes = line.getBytes( "ISO-8859-1" );
+                    byte[] lineBytes = line.getBytes(ISO_8859_1);
                     g2.drawBytes( lineBytes, 0, lineBytes.length, 0, 0 );
                 }
                 catch ( Exception e ) {

src/demo/share/jfc/SwingSet2/DemoModule.java

@@ -1,6 +1,5 @@
 /*
- *
- * Copyright (c) 2007, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2007, 2021, Oracle and/or its affiliates. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -46,6 +45,8 @@
 import java.applet.*;
 import java.net.*;
 
+import static java.nio.charset.StandardCharsets.UTF_8;
+
 /**
  * A generic SwingSet2 demo module
  *
@@ -155,7 +156,7 @@ public void loadSourceCode() {
             try {
                 url = getClass().getResource(filename);
                 is = url.openStream();
-                isr = new InputStreamReader(is, "UTF-8");
+                isr = new InputStreamReader(is, UTF_8);
                 BufferedReader reader = new BufferedReader(isr);
 
                 // Read one line at a time, htmlize using super-spiffy

src/demo/share/jfc/SwingSet2/TreeDemo.java

@@ -1,6 +1,5 @@
 /*
- *
- * Copyright (c) 2007, 2019, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2007, 2021, Oracle and/or its affiliates. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -44,6 +43,8 @@
 import java.applet.*;
 import java.net.*;
 
+import static java.nio.charset.StandardCharsets.UTF_8;
+
 /**
  * JTree Demo
  *
@@ -84,7 +85,7 @@ public JScrollPane createTree() {
         try {
             // convert url to buffered string
             InputStream is = url.openStream();
-            InputStreamReader isr = new InputStreamReader(is, "UTF-8");
+            InputStreamReader isr = new InputStreamReader(is, UTF_8);
             BufferedReader reader = new BufferedReader(isr);
 
             // read one line at a time, put into tree

src/java.base/share/classes/sun/security/util/DerOutputStream.java

@@ -37,7 +37,10 @@
 import java.util.Arrays;
 import java.util.Locale;
 
-import static java.nio.charset.StandardCharsets.*;
+import static java.nio.charset.StandardCharsets.ISO_8859_1;
+import static java.nio.charset.StandardCharsets.US_ASCII;
+import static java.nio.charset.StandardCharsets.UTF_16BE;
+import static java.nio.charset.StandardCharsets.UTF_8;
 
 /**
  * Output stream marshaling DER-encoded data.  This is eventually provided

src/java.base/share/classes/sun/security/util/DerValue.java

@@ -34,7 +34,10 @@
 import java.nio.charset.Charset;
 import java.util.*;
 
-import static java.nio.charset.StandardCharsets.*;
+import static java.nio.charset.StandardCharsets.ISO_8859_1;
+import static java.nio.charset.StandardCharsets.US_ASCII;
+import static java.nio.charset.StandardCharsets.UTF_16BE;
+import static java.nio.charset.StandardCharsets.UTF_8;
 
 /**
  * Represents a single DER-encoded value.  DER encoding rules are a subset

src/java.datatransfer/share/classes/sun/datatransfer/DataFlavorUtil.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2015, 2021, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -51,6 +51,13 @@
 import java.util.TreeSet;
 import java.util.function.Supplier;
 
+import static java.nio.charset.StandardCharsets.ISO_8859_1;
+import static java.nio.charset.StandardCharsets.US_ASCII;
+import static java.nio.charset.StandardCharsets.UTF_16;
+import static java.nio.charset.StandardCharsets.UTF_16BE;
+import static java.nio.charset.StandardCharsets.UTF_16LE;
+import static java.nio.charset.StandardCharsets.UTF_8;
+
 /**
  * Utility class with different datatransfer helper functions.
  *
@@ -115,12 +122,12 @@ private static class StandardEncodingsHolder {
 
         private static SortedSet<String> load() {
             final SortedSet<String> tempSet = new TreeSet<>(getCharsetComparator().reversed());
-            tempSet.add("US-ASCII");
-            tempSet.add("ISO-8859-1");
-            tempSet.add("UTF-8");
-            tempSet.add("UTF-16BE");
-            tempSet.add("UTF-16LE");
-            tempSet.add("UTF-16");
+            tempSet.add(US_ASCII.name());
+            tempSet.add(ISO_8859_1.name());
+            tempSet.add(UTF_8.name());
+            tempSet.add(UTF_16BE.name());
+            tempSet.add(UTF_16LE.name());
+            tempSet.add(UTF_16.name());
             tempSet.add(Charset.defaultCharset().name());
             return Collections.unmodifiableSortedSet(tempSet);
         }
@@ -318,13 +325,13 @@ private static class CharsetComparator implements Comparator<String> {
             Map<String, Integer> charsetsMap = new HashMap<>(8, 1.0f);
 
             // we prefer Unicode charsets
-            charsetsMap.put(canonicalName("UTF-16LE"), 4);
-            charsetsMap.put(canonicalName("UTF-16BE"), 5);
-            charsetsMap.put(canonicalName("UTF-8"), 6);
-            charsetsMap.put(canonicalName("UTF-16"), 7);
+            charsetsMap.put(UTF_16LE.name(), 4);
+            charsetsMap.put(UTF_16BE.name(), 5);
+            charsetsMap.put(UTF_8.name(), 6);
+            charsetsMap.put(UTF_16.name(), 7);
 
             // US-ASCII is the worst charset supported
-            charsetsMap.put(canonicalName("US-ASCII"), WORST_CHARSET_INDEX);
+            charsetsMap.put(US_ASCII.name(), WORST_CHARSET_INDEX);
 
             charsetsMap.putIfAbsent(Charset.defaultCharset().name(), DEFAULT_CHARSET_INDEX);
 

src/java.desktop/macosx/classes/sun/font/CFontConfiguration.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2011, 2014, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2011, 2021, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -27,9 +27,10 @@
 
 import java.nio.charset.Charset;
 import java.util.HashMap;
+
 import sun.awt.FontConfiguration;
-import sun.font.CompositeFontDescriptor;
-import sun.font.SunFontManager;
+
+import static java.nio.charset.StandardCharsets.ISO_8859_1;
 
 class CFontConfiguration extends FontConfiguration {
 
@@ -79,7 +80,7 @@ protected String mapFileName(String fileName) {
 
     @Override
     protected Charset getDefaultFontCharset(String fontName) {
-        return Charset.forName("ISO8859_1");
+        return ISO_8859_1;
     }
 
     @Override

src/java.desktop/share/classes/com/sun/imageio/plugins/png/PNGImageReader.java

@@ -42,6 +42,7 @@
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.SequenceInputStream;
+import java.nio.charset.Charset;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Enumeration;
@@ -216,7 +217,7 @@ public void setInput(Object input,
         resetStreamSettings();
     }
 
-    private String readNullTerminatedString(String charset, int maxLen) throws IOException {
+    private String readNullTerminatedString(Charset charset, int maxLen) throws IOException {
         ByteArrayOutputStream baos = new ByteArrayOutputStream();
         int b = 0;
         int count = 0;
@@ -438,7 +439,7 @@ private void parse_hIST_chunk(int chunkLength) throws IOException,
     }
 
     private void parse_iCCP_chunk(int chunkLength) throws IOException {
-        String keyword = readNullTerminatedString("ISO-8859-1", 80);
+        String keyword = readNullTerminatedString(ISO_8859_1, 80);
         int compressedProfileLength = chunkLength - keyword.length() - 2;
         if (compressedProfileLength <= 0) {
             throw new IIOException("iCCP chunk length is not proper");
@@ -458,7 +459,7 @@ private void parse_iCCP_chunk(int chunkLength) throws IOException {
     private void parse_iTXt_chunk(int chunkLength) throws IOException {
         long chunkStart = stream.getStreamPosition();
 
-        String keyword = readNullTerminatedString("ISO-8859-1", 80);
+        String keyword = readNullTerminatedString(ISO_8859_1, 80);
         metadata.iTXt_keyword.add(keyword);
 
         int compressionFlag = stream.readUnsignedByte();
@@ -469,7 +470,7 @@ private void parse_iTXt_chunk(int chunkLength) throws IOException {
 
         long pos = stream.getStreamPosition();
         int remainingLen = (int)(chunkStart + chunkLength - pos);
-        String languageTag = readNullTerminatedString("UTF8", remainingLen);
+        String languageTag = readNullTerminatedString(UTF_8, remainingLen);
         metadata.iTXt_languageTag.add(languageTag);
 
         pos = stream.getStreamPosition();
@@ -478,7 +479,7 @@ private void parse_iTXt_chunk(int chunkLength) throws IOException {
             throw new IIOException("iTXt chunk length is not proper");
         }
         String translatedKeyword =
-            readNullTerminatedString("UTF8", remainingLen);
+            readNullTerminatedString(UTF_8, remainingLen);
         metadata.iTXt_translatedKeyword.add(translatedKeyword);
 
         String text;
@@ -538,7 +539,7 @@ private void parse_sBIT_chunk() throws IOException {
 
     private void parse_sPLT_chunk(int chunkLength)
         throws IOException, IIOException {
-        metadata.sPLT_paletteName = readNullTerminatedString("ISO-8859-1", 80);
+        metadata.sPLT_paletteName = readNullTerminatedString(ISO_8859_1, 80);
         int remainingChunkLength = chunkLength -
                 (metadata.sPLT_paletteName.length() + 1);
         if (remainingChunkLength <= 0) {
@@ -585,7 +586,7 @@ private void parse_sRGB_chunk() throws IOException {
     }
 
     private void parse_tEXt_chunk(int chunkLength) throws IOException {
-        String keyword = readNullTerminatedString("ISO-8859-1", 80);
+        String keyword = readNullTerminatedString(ISO_8859_1, 80);
         int textLength = chunkLength - keyword.length() - 1;
         if (textLength < 0) {
             throw new IIOException("tEXt chunk length is not proper");
@@ -683,7 +684,7 @@ private static byte[] inflate(byte[] b) throws IOException {
     }
 
     private void parse_zTXt_chunk(int chunkLength) throws IOException {
-        String keyword = readNullTerminatedString("ISO-8859-1", 80);
+        String keyword = readNullTerminatedString(ISO_8859_1, 80);
         int textLength = chunkLength - keyword.length() - 2;
         if (textLength < 0) {
             throw new IIOException("zTXt chunk length is not proper");

src/java.desktop/unix/classes/sun/font/FcFontConfiguration.java

@@ -158,7 +158,7 @@ public String getFileNameFromPlatformName(String platformName) {
 
     @Override
     protected Charset getDefaultFontCharset(String fontName) {
-        return Charset.forName("ISO8859_1");
+        return ISO_8859_1;
     }
 
     @Override

src/java.desktop/unix/classes/sun/font/MFontConfiguration.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2000, 2020, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2000, 2021, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -39,6 +39,8 @@
 import java.util.Properties;
 import java.util.Scanner;
 
+import static java.nio.charset.StandardCharsets.ISO_8859_1;
+
 public class MFontConfiguration extends FontConfiguration {
 
     private static FontConfiguration fontConfig = null;
@@ -180,7 +182,7 @@ protected String getEncoding(String awtFontName,
     }
 
     protected Charset getDefaultFontCharset(String fontName) {
-        return Charset.forName("ISO8859_1");
+        return ISO_8859_1;
     }
 
     protected String getFaceNameFromComponentFontName(String componentFontName) {

src/java.security.jgss/share/classes/sun/security/krb5/internal/PAData.java

@@ -34,7 +34,8 @@
 import java.io.IOException;
 import java.util.Vector;
 
-import static java.nio.charset.StandardCharsets.*;
+import static java.nio.charset.StandardCharsets.ISO_8859_1;
+import static java.nio.charset.StandardCharsets.UTF_8;
 
 import sun.security.krb5.Asn1Exception;
 import sun.security.krb5.internal.util.KerberosString;

src/java.security.jgss/share/classes/sun/security/krb5/internal/crypto/dk/DkCrypto.java

@@ -36,15 +36,15 @@
 import java.util.Arrays;
 import java.io.ByteArrayInputStream;
 import java.io.ByteArrayOutputStream;
-import java.nio.charset.Charset;
 import java.nio.CharBuffer;
 import java.nio.ByteBuffer;
 import sun.security.util.HexDumpEncoder;
 import sun.security.krb5.Confounder;
 import sun.security.krb5.internal.crypto.KeyUsage;
 import sun.security.krb5.KrbCryptoException;
 
-import static java.nio.charset.StandardCharsets.*;
+import static java.nio.charset.StandardCharsets.UTF_16LE;
+import static java.nio.charset.StandardCharsets.UTF_8;
 
 /**
  * Implements Derive Key cryptography functionality as defined in RFC 3961.