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8201178: Remove sun.nio.cs.FastCharsetProvider

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Reviewed-by: alanb
This commit is contained in:
Claes Redestad 2018-04-09 13:35:19 +02:00
parent d9c5e142c0
commit 48f96d897a
1 changed files with 0 additions and 161 deletions
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161
src/java.base/share/classes/sun/nio/cs/FastCharsetProvider.java
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@ -1,161 +0,0 @@
/*
* Copyright (c) 2004, 2011, 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.nio.cs;
import java.nio.charset.Charset;
import java.nio.charset.spi.CharsetProvider;
import java.util.Iterator;
import java.util.Map;
/**
* Abstract base class for fast charset providers.
*
* @author Mark Reinhold
*/
public class FastCharsetProvider
extends CharsetProvider
{
// Maps canonical names to class names
private Map<String,String> classMap;
// Maps alias names to canonical names
private Map<String,String> aliasMap;
// Maps canonical names to cached instances
private Map<String,Charset> cache;
private String packagePrefix;
protected FastCharsetProvider(String pp,
Map<String,String> am,
Map<String,String> cm,
Map<String,Charset> c)
{
packagePrefix = pp;
aliasMap = am;
classMap = cm;
cache = c;
}
private String canonicalize(String csn) {
String acn = aliasMap.get(csn);
return (acn != null) ? acn : csn;
}
// Private ASCII-only version, optimized for interpretation during startup
//
private static String toLower(String s) {
int n = s.length();
boolean allLower = true;
for (int i = 0; i < n; i++) {
int c = s.charAt(i);
if (((c - 'A') | ('Z' - c)) >= 0) {
allLower = false;
break;
}
}
if (allLower)
return s;
char[] ca = new char[n];
for (int i = 0; i < n; i++) {
int c = s.charAt(i);
if (((c - 'A') | ('Z' - c)) >= 0)
ca[i] = (char)(c + 0x20);
else
ca[i] = (char)c;
}
return new String(ca);
}
private Charset lookup(String charsetName) {
String csn = canonicalize(toLower(charsetName));
// Check cache first
Charset cs = cache.get(csn);
if (cs != null)
return cs;
// Do we even support this charset?
String cln = classMap.get(csn);
if (cln == null)
return null;
if (cln.equals("US_ASCII")) {
cs = new US_ASCII();
cache.put(csn, cs);
return cs;
}
// Instantiate the charset and cache it
try {
@SuppressWarnings("deprecation")
Object o= Class.forName(packagePrefix + "." + cln,
true,
this.getClass().getClassLoader()).newInstance();
cs = (Charset)o;
cache.put(csn, cs);
return cs;
} catch (ClassNotFoundException |
IllegalAccessException |
InstantiationException x) {
return null;
}
}
public final Charset charsetForName(String charsetName) {
synchronized (this) {
return lookup(canonicalize(charsetName));
}
}
public final Iterator<Charset> charsets() {
return new Iterator<Charset>() {
Iterator<String> i = classMap.keySet().iterator();
public boolean hasNext() {
return i.hasNext();
}
public Charset next() {
String csn = i.next();
return lookup(csn);
}
public void remove() {
throw new UnsupportedOperationException();
}
};
}
}