8201178: Remove sun.nio.cs.FastCharsetProvider
Reviewed-by: alanb
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/*
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* Copyright (c) 2004, 2011, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package sun.nio.cs;
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import java.nio.charset.Charset;
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import java.nio.charset.spi.CharsetProvider;
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import java.util.Iterator;
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import java.util.Map;
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/**
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* Abstract base class for fast charset providers.
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*
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* @author Mark Reinhold
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*/
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public class FastCharsetProvider
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extends CharsetProvider
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{
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// Maps canonical names to class names
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private Map<String,String> classMap;
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// Maps alias names to canonical names
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private Map<String,String> aliasMap;
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// Maps canonical names to cached instances
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private Map<String,Charset> cache;
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private String packagePrefix;
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protected FastCharsetProvider(String pp,
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Map<String,String> am,
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Map<String,String> cm,
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Map<String,Charset> c)
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{
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packagePrefix = pp;
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aliasMap = am;
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classMap = cm;
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cache = c;
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}
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private String canonicalize(String csn) {
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String acn = aliasMap.get(csn);
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return (acn != null) ? acn : csn;
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}
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// Private ASCII-only version, optimized for interpretation during startup
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//
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private static String toLower(String s) {
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int n = s.length();
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boolean allLower = true;
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for (int i = 0; i < n; i++) {
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int c = s.charAt(i);
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if (((c - 'A') | ('Z' - c)) >= 0) {
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allLower = false;
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break;
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}
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}
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if (allLower)
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return s;
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char[] ca = new char[n];
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for (int i = 0; i < n; i++) {
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int c = s.charAt(i);
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if (((c - 'A') | ('Z' - c)) >= 0)
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ca[i] = (char)(c + 0x20);
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else
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ca[i] = (char)c;
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}
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return new String(ca);
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}
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private Charset lookup(String charsetName) {
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String csn = canonicalize(toLower(charsetName));
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// Check cache first
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Charset cs = cache.get(csn);
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if (cs != null)
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return cs;
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// Do we even support this charset?
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String cln = classMap.get(csn);
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if (cln == null)
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return null;
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if (cln.equals("US_ASCII")) {
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cs = new US_ASCII();
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cache.put(csn, cs);
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return cs;
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}
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// Instantiate the charset and cache it
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try {
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@SuppressWarnings("deprecation")
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Object o= Class.forName(packagePrefix + "." + cln,
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true,
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this.getClass().getClassLoader()).newInstance();
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cs = (Charset)o;
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cache.put(csn, cs);
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return cs;
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} catch (ClassNotFoundException |
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IllegalAccessException |
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InstantiationException x) {
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return null;
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}
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}
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public final Charset charsetForName(String charsetName) {
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synchronized (this) {
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return lookup(canonicalize(charsetName));
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}
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}
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public final Iterator<Charset> charsets() {
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return new Iterator<Charset>() {
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Iterator<String> i = classMap.keySet().iterator();
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public boolean hasNext() {
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return i.hasNext();
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}
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public Charset next() {
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String csn = i.next();
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return lookup(csn);
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}
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public void remove() {
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throw new UnsupportedOperationException();
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}
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};
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}
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}
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