25 
  26 package java.lang;
  27 
  28 import java.io.UnsupportedEncodingException;
  29 import java.lang.ref.SoftReference;
  30 import java.nio.ByteBuffer;
  31 import java.nio.CharBuffer;
  32 import java.nio.charset.Charset;
  33 import java.nio.charset.CharsetDecoder;
  34 import java.nio.charset.CharsetEncoder;
  35 import java.nio.charset.CharacterCodingException;
  36 import java.nio.charset.CoderResult;
  37 import java.nio.charset.CodingErrorAction;
  38 import java.nio.charset.IllegalCharsetNameException;
  39 import java.nio.charset.UnsupportedCharsetException;
  40 import java.util.Arrays;
  41 import jdk.internal.HotSpotIntrinsicCandidate;
  42 import sun.nio.cs.HistoricallyNamedCharset;
  43 import sun.nio.cs.ArrayDecoder;
  44 import sun.nio.cs.ArrayEncoder;

  45 
  46 import static java.lang.String.LATIN1;
  47 import static java.lang.String.UTF16;
  48 import static java.lang.String.COMPACT_STRINGS;
  49 
  50 /**
  51  * Utility class for string encoding and decoding.
  52  */
  53 
  54 class StringCoding {
  55 
  56     private StringCoding() { }
  57 
  58     /** The cached coders for each thread */
  59     private static final ThreadLocal<SoftReference<StringDecoder>> decoder =
  60         new ThreadLocal<>();
  61     private static final ThreadLocal<SoftReference<StringEncoder>> encoder =
  62         new ThreadLocal<>();
  63 
  64     private static final Charset ISO_8859_1 = Charset.forName("iso-8859-1");
  65     private static final Charset US_ASCII = Charset.forName("us-ascii");
  66     private static final Charset UTF_8 = Charset.forName("utf-8");
  67 
  68     private static boolean warnUnsupportedCharset = true;
  69 
  70     private static <T> T deref(ThreadLocal<SoftReference<T>> tl) {
  71         SoftReference<T> sr = tl.get();
  72         if (sr == null)
  73             return null;
  74         return sr.get();
  75     }
  76 
  77     private static <T> void set(ThreadLocal<SoftReference<T>> tl, T ob) {
  78         tl.set(new SoftReference<>(ob));
  79     }
  80 
  81     // Trim the given byte array to the given length
  82     //
  83     private static byte[] safeTrim(byte[] ba, int len, boolean isTrusted) {
  84         if (len == ba.length && (isTrusted || System.getSecurityManager() == null))
  85             return ba;
  86         else

  25 
  26 package java.lang;
  27 
  28 import java.io.UnsupportedEncodingException;
  29 import java.lang.ref.SoftReference;
  30 import java.nio.ByteBuffer;
  31 import java.nio.CharBuffer;
  32 import java.nio.charset.Charset;
  33 import java.nio.charset.CharsetDecoder;
  34 import java.nio.charset.CharsetEncoder;
  35 import java.nio.charset.CharacterCodingException;
  36 import java.nio.charset.CoderResult;
  37 import java.nio.charset.CodingErrorAction;
  38 import java.nio.charset.IllegalCharsetNameException;
  39 import java.nio.charset.UnsupportedCharsetException;
  40 import java.util.Arrays;
  41 import jdk.internal.HotSpotIntrinsicCandidate;
  42 import sun.nio.cs.HistoricallyNamedCharset;
  43 import sun.nio.cs.ArrayDecoder;
  44 import sun.nio.cs.ArrayEncoder;
  45 import sun.nio.cs.StandardCharsets;
  46 
  47 import static java.lang.String.LATIN1;
  48 import static java.lang.String.UTF16;
  49 import static java.lang.String.COMPACT_STRINGS;
  50 
  51 /**
  52  * Utility class for string encoding and decoding.
  53  */
  54 
  55 class StringCoding {
  56 
  57     private StringCoding() { }
  58 
  59     /** The cached coders for each thread */
  60     private static final ThreadLocal<SoftReference<StringDecoder>> decoder =
  61         new ThreadLocal<>();
  62     private static final ThreadLocal<SoftReference<StringEncoder>> encoder =
  63         new ThreadLocal<>();
  64 
  65     private static final Charset ISO_8859_1 = sun.nio.cs.ISO_8859_1.INSTANCE;
  66     private static final Charset US_ASCII = sun.nio.cs.US_ASCII.INSTANCE;
  67     private static final Charset UTF_8 = sun.nio.cs.UTF_8.INSTANCE;
  68 
  69     private static boolean warnUnsupportedCharset = true;
  70 
  71     private static <T> T deref(ThreadLocal<SoftReference<T>> tl) {
  72         SoftReference<T> sr = tl.get();
  73         if (sr == null)
  74             return null;
  75         return sr.get();
  76     }
  77 
  78     private static <T> void set(ThreadLocal<SoftReference<T>> tl, T ob) {
  79         tl.set(new SoftReference<>(ob));
  80     }
  81 
  82     // Trim the given byte array to the given length
  83     //
  84     private static byte[] safeTrim(byte[] ba, int len, boolean isTrusted) {
  85         if (len == ba.length && (isTrusted || System.getSecurityManager() == null))
  86             return ba;
  87         else