| /* |
| * Copyright (c) 1998, 2006, 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 |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package sun.io; |
| |
| import java.io.UnsupportedEncodingException; |
| import java.lang.ref.SoftReference; |
| import java.util.Properties; |
| |
| /** |
| * Package-private utility class that caches the default converter classes and |
| * provides other logic common to both the ByteToCharConverter and |
| * CharToByteConverter classes. |
| * |
| * @author Mark Reinhold |
| * @since 1.2 |
| * |
| * @deprecated Replaced by {@link java.nio.charset}. THIS API WILL BE |
| * REMOVED IN J2SE 1.6. |
| */ |
| @Deprecated |
| public class Converters { |
| |
| private Converters() { } /* To prevent instantiation */ |
| |
| /* Lock for all static fields in this class */ |
| private static Object lock = Converters.class; |
| |
| /* Cached values of system properties */ |
| private static String converterPackageName = null; /* file.encoding.pkg */ |
| private static String defaultEncoding = null; /* file.encoding */ |
| |
| /* Converter type constants and names */ |
| public static final int BYTE_TO_CHAR = 0; |
| public static final int CHAR_TO_BYTE = 1; |
| private static final String[] converterPrefix = { "ByteToChar", |
| "CharToByte" }; |
| |
| |
| // -- Converter class cache -- |
| |
| private static final int CACHE_SIZE = 3; |
| |
| /* For the default charset, whatever it turns out to be */ |
| private static final Object DEFAULT_NAME = new Object(); |
| |
| /* Cached converter classes, CACHE_SIZE per converter type. Each cache |
| * entry is a soft reference to a two-object array; the first element of |
| * the array is the converter class, the second is an object (typically a |
| * string) representing the encoding name that was used to request the |
| * converter, e.g., |
| * |
| * ((Object[])classCache[CHAR_TO_BYTE][i].get())[0] |
| * |
| * will be a CharToByteConverter and |
| * |
| * ((Object[])classCache[CHAR_TO_BYTE][i].get())[1] |
| * |
| * will be the string encoding name used to request it, assuming that cache |
| * entry i is valid. |
| * |
| * Ordinarily we'd do this with a private static utility class, but since |
| * this code can be involved in the startup sequence it's important to keep |
| * the footprint down. |
| */ |
| @SuppressWarnings("unchecked") |
| private static SoftReference<Object[]>[][] classCache |
| = (SoftReference<Object[]>[][]) new SoftReference<?>[][] { |
| new SoftReference<?>[CACHE_SIZE], |
| new SoftReference<?>[CACHE_SIZE] |
| }; |
| |
| private static void moveToFront(Object[] oa, int i) { |
| Object ob = oa[i]; |
| for (int j = i; j > 0; j--) |
| oa[j] = oa[j - 1]; |
| oa[0] = ob; |
| } |
| |
| private static Class<?> cache(int type, Object encoding) { |
| SoftReference<Object[]>[] srs = classCache[type]; |
| for (int i = 0; i < CACHE_SIZE; i++) { |
| SoftReference<Object[]> sr = srs[i]; |
| if (sr == null) |
| continue; |
| Object[] oa = sr.get(); |
| if (oa == null) { |
| srs[i] = null; |
| continue; |
| } |
| if (oa[1].equals(encoding)) { |
| moveToFront(srs, i); |
| return (Class<?>)oa[0]; |
| } |
| } |
| return null; |
| } |
| |
| private static Class<?> cache(int type, Object encoding, Class<?> c) { |
| SoftReference<Object[]>[] srs = classCache[type]; |
| srs[CACHE_SIZE - 1] = new SoftReference<Object[]>(new Object[] { c, encoding }); |
| moveToFront(srs, CACHE_SIZE - 1); |
| return c; |
| } |
| |
| /* Used to avoid doing expensive charset lookups for charsets that are not |
| * yet directly supported by NIO. |
| */ |
| public static boolean isCached(int type, String encoding) { |
| synchronized (lock) { |
| SoftReference<Object[]>[] srs = classCache[type]; |
| for (int i = 0; i < CACHE_SIZE; i++) { |
| SoftReference<Object[]> sr = srs[i]; |
| if (sr == null) |
| continue; |
| Object[] oa = sr.get(); |
| if (oa == null) { |
| srs[i] = null; |
| continue; |
| } |
| if (oa[1].equals(encoding)) |
| return true; |
| } |
| return false; |
| } |
| } |
| |
| |
| |
| /** Get the name of the converter package */ |
| private static String getConverterPackageName() { |
| String cp = converterPackageName; |
| if (cp != null) return cp; |
| java.security.PrivilegedAction<String> pa = |
| new sun.security.action.GetPropertyAction("file.encoding.pkg"); |
| cp = java.security.AccessController.doPrivileged(pa); |
| if (cp != null) { |
| /* Property is set, so take it as the true converter package */ |
| converterPackageName = cp; |
| } else { |
| /* Fall back to sun.io */ |
| cp = "sun.io"; |
| } |
| return cp; |
| } |
| |
| public static String getDefaultEncodingName() { |
| synchronized (lock) { |
| if (defaultEncoding == null) { |
| java.security.PrivilegedAction<String> pa = |
| new sun.security.action.GetPropertyAction("file.encoding"); |
| defaultEncoding = java.security.AccessController.doPrivileged(pa); |
| } |
| } |
| return defaultEncoding; |
| } |
| |
| public static void resetDefaultEncodingName() { |
| // This method should only be called during VM initialization. |
| if (sun.misc.VM.isBooted()) |
| return; |
| |
| synchronized (lock) { |
| defaultEncoding = "ISO-8859-1"; |
| Properties p = System.getProperties(); |
| p.setProperty("file.encoding", defaultEncoding); |
| System.setProperties(p); |
| } |
| } |
| |
| /** |
| * Get the class that implements the given type of converter for the named |
| * encoding, or throw an UnsupportedEncodingException if no such class can |
| * be found |
| */ |
| private static Class<?> getConverterClass(int type, String encoding) |
| throws UnsupportedEncodingException |
| { |
| String enc = null; |
| |
| /* "ISO8859_1" is the canonical name for the ISO-Latin-1 encoding. |
| Native code in the JDK commonly uses the alias "8859_1" instead of |
| "ISO8859_1". We hardwire this alias here in order to avoid loading |
| the full alias table just for this case. */ |
| if (!encoding.equals("ISO8859_1")) { |
| if (encoding.equals("8859_1")) { |
| enc = "ISO8859_1"; |
| /* |
| * On Solaris with nl_langinfo() called in GetJavaProperties(): |
| * |
| * locale undefined -> NULL -> hardcoded default |
| * "C" locale -> "" -> hardcoded default (on 2.6) |
| * "C" locale -> "646" (on 2.7) |
| * "en_US" locale -> "ISO8859-1" |
| * "en_GB" locale -> "ISO8859-1" (on 2.7) |
| * "en_UK" locale -> "ISO8859-1" (on 2.6) |
| */ |
| } else if (encoding.equals("ISO8859-1")) { |
| enc = "ISO8859_1"; |
| } else if (encoding.equals("646")) { |
| enc = "ASCII"; |
| } else { |
| enc = CharacterEncoding.aliasName(encoding); |
| } |
| } |
| if (enc == null) { |
| enc = encoding; |
| } |
| |
| try { |
| return Class.forName(getConverterPackageName() |
| + "." + converterPrefix[type] + enc); |
| } catch(ClassNotFoundException e) { |
| throw new UnsupportedEncodingException(enc); |
| } |
| |
| } |
| |
| /** |
| * Instantiate the given converter class, or throw an |
| * UnsupportedEncodingException if it cannot be instantiated |
| */ |
| private static Object newConverter(String enc, Class<?> c) |
| throws UnsupportedEncodingException |
| { |
| try { |
| return c.newInstance(); |
| } catch(InstantiationException e) { |
| throw new UnsupportedEncodingException(enc); |
| } catch(IllegalAccessException e) { |
| throw new UnsupportedEncodingException(enc); |
| } |
| } |
| |
| /** |
| * Create a converter object that implements the given type of converter |
| * for the given encoding, or throw an UnsupportedEncodingException if no |
| * appropriate converter class can be found and instantiated |
| */ |
| static Object newConverter(int type, String enc) |
| throws UnsupportedEncodingException |
| { |
| Class<?> c; |
| synchronized (lock) { |
| c = cache(type, enc); |
| if (c == null) { |
| c = getConverterClass(type, enc); |
| if (!c.getName().equals("sun.io.CharToByteUTF8")) |
| cache(type, enc, c); |
| } |
| } |
| return newConverter(enc, c); |
| } |
| |
| /** |
| * Find the class that implements the given type of converter for the |
| * default encoding. If the default encoding cannot be determined or is |
| * not yet defined, return a class that implements the fallback default |
| * encoding, which is just ISO 8859-1. |
| */ |
| private static Class<?> getDefaultConverterClass(int type) { |
| boolean fillCache = false; |
| Class<?> c; |
| |
| /* First check the class cache */ |
| c = cache(type, DEFAULT_NAME); |
| if (c != null) |
| return c; |
| |
| /* Determine the encoding name */ |
| String enc = getDefaultEncodingName(); |
| if (enc != null) { |
| /* file.encoding has been set, so cache the converter class */ |
| fillCache = true; |
| } else { |
| /* file.encoding has not been set, so use a default encoding which |
| will not be cached */ |
| enc = "ISO8859_1"; |
| } |
| |
| /* We have an encoding name; try to find its class */ |
| try { |
| c = getConverterClass(type, enc); |
| if (fillCache) { |
| cache(type, DEFAULT_NAME, c); |
| } |
| } catch (UnsupportedEncodingException x) { |
| /* Can't find the default class, so fall back to ISO 8859-1 */ |
| try { |
| c = getConverterClass(type, "ISO8859_1"); |
| } catch (UnsupportedEncodingException y) { |
| throw new InternalError("Cannot find default " |
| + converterPrefix[type] |
| + " converter class"); |
| } |
| } |
| return c; |
| |
| } |
| |
| /** |
| * Create a converter object that implements the given type of converter |
| * for the default encoding, falling back to ISO 8859-1 if the default |
| * encoding cannot be determined. |
| */ |
| static Object newDefaultConverter(int type) { |
| Class<?> c; |
| synchronized (lock) { |
| c = getDefaultConverterClass(type); |
| } |
| try { |
| return newConverter("", c); |
| } catch (UnsupportedEncodingException x) { |
| throw new InternalError("Cannot instantiate default converter" |
| + " class " + c.getName()); |
| } |
| } |
| |
| } |
