--- a/src/java.base/share/classes/sun/nio/cs/FastCharsetProvider.java	Sun Apr 08 17:01:20 2018 +0800
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -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();
-                }
-
-            };
-
-    }
-
-}