/* * Copyright (c) 2004, 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.lang.ref.SoftReference;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 { Class c = Class.forName(packagePrefix + "." + cln, true, this.getClass().getClassLoader()); cs = (Charset)c.newInstance(); cache.put(csn, cs); return cs; } catch (ClassNotFoundException x) { return null; } catch (IllegalAccessException x) { return null; } catch (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(); } }; }}
/*
* Copyright (c) 2004, 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.lang.ref.SoftReference;
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 {
Class c = Class.forName(packagePrefix + "." + cln,
true,
this.getClass().getClassLoader());
cs = (Charset)c.newInstance();
cache.put(csn, cs);
return cs;
} catch (ClassNotFoundException x) {
return null;
} catch (IllegalAccessException x) {
return null;
} catch (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();
}
};
}
}