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| 1 | /* | ||
| 2 | * Copyright (c) 2001, Oracle and/or its affiliates. All rights reserved. | ||
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
| 4 | * | ||
| 5 | * This code is free software; you can redistribute it and/or modify it | ||
| 6 | * under the terms of the GNU General Public License version 2 only, as | ||
| 7 | * published by the Free Software Foundation. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle in the LICENSE file that accompanied this code. | ||
| 10 | * | ||
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT | ||
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
| 14 | * version 2 for more details (a copy is included in the LICENSE file that | ||
| 15 | * accompanied this code). | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU General Public License version | ||
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, | ||
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
| 20 | * | ||
| 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * questions. | ||
| 24 | */ | ||
| 25 | |||
| 26 | |||
| 27 | package sun.nio.cs; | ||
| 28 | |||
| 29 | import java.nio.*; | ||
| 30 | import java.nio.charset.*; | ||
| 31 | |||
| 32 | |||
| 33 | /** | ||
| 34 | * Utility class for caching per-thread decoders and encoders. | ||
| 35 | */ | ||
| 36 | |||
| 37 | public class ThreadLocalCoders { | ||
| 38 | |||
| 39 | private static final int CACHE_SIZE = 3; | ||
| 40 | |||
| 41 | private static abstract class Cache { | ||
| 42 | |||
| 43 | // Thread-local reference to array of cached objects, in LRU order | ||
| 44 | private ThreadLocal cache = new ThreadLocal(); | ||
| 45 | private final int size; | ||
| 46 | |||
| 47 | Cache(int size) { | ||
| 48 | this.size = size; | ||
| 49 | } | ||
| 50 | |||
| 51 | abstract Object create(Object name); | ||
| 52 | |||
| 53 | private void moveToFront(Object[] oa, int i) { | ||
| 54 | Object ob = oa[i]; | ||
| 55 | for (int j = i; j > 0; j--) | ||
| 56 | oa[j] = oa[j - 1]; | ||
| 57 | oa[0] = ob; | ||
| 58 | } | ||
| 59 | |||
| 60 | abstract boolean hasName(Object ob, Object name); | ||
| 61 | |||
| 62 | Object forName(Object name) { | ||
| 63 | Object[] oa = (Object[])cache.get(); | ||
| 64 | if (oa == null) { | ||
| 65 | oa = new Object[size]; | ||
| 66 | cache.set(oa); | ||
| 67 | } else { | ||
| 68 | for (int i = 0; i < oa.length; i++) { | ||
| 69 | Object ob = oa[i]; | ||
| 70 | if (ob == null) | ||
| 71 | continue; | ||
| 72 | if (hasName(ob, name)) { | ||
| 73 | if (i > 0) | ||
| 74 | moveToFront(oa, i); | ||
| 75 | return ob; | ||
| 76 | } | ||
| 77 | } | ||
| 78 | } | ||
| 79 | |||
| 80 | // Create a new object | ||
| 81 | Object ob = create(name); | ||
| 82 | oa[oa.length - 1] = ob; | ||
| 83 | moveToFront(oa, oa.length - 1); | ||
| 84 | return ob; | ||
| 85 | } | ||
| 86 | |||
| 87 | } | ||
| 88 | |||
| 89 | private static Cache decoderCache = new Cache(CACHE_SIZE) { | ||
| 90 | boolean hasName(Object ob, Object name) { | ||
| 91 | if (name instanceof String) | ||
| 92 | return (((CharsetDecoder)ob).charset().name().equals(name)); | ||
| 93 | if (name instanceof Charset) | ||
| 94 | return ((CharsetDecoder)ob).charset().equals(name); | ||
| 95 | return false; | ||
| 96 | } | ||
| 97 | Object create(Object name) { | ||
| 98 | if (name instanceof String) | ||
| 99 | return Charset.forName((String)name).newDecoder(); | ||
| 100 | if (name instanceof Charset) | ||
| 101 | return ((Charset)name).newDecoder(); | ||
| 102 | assert false; | ||
| 103 | return null; | ||
| 104 | } | ||
| 105 | }; | ||
| 106 | |||
| 107 | public static CharsetDecoder decoderFor(Object name) { | ||
| 108 | CharsetDecoder cd = (CharsetDecoder)decoderCache.forName(name); | ||
| 109 | cd.reset(); | ||
| 110 | return cd; | ||
| 111 | } | ||
| 112 | |||
| 113 | private static Cache encoderCache = new Cache(CACHE_SIZE) { | ||
| 114 | boolean hasName(Object ob, Object name) { | ||
| 115 | if (name instanceof String) | ||
| 116 | return (((CharsetEncoder)ob).charset().name().equals(name)); | ||
| 117 | if (name instanceof Charset) | ||
| 118 | return ((CharsetEncoder)ob).charset().equals(name); | ||
| 119 | return false; | ||
| 120 | } | ||
| 121 | Object create(Object name) { | ||
| 122 | if (name instanceof String) | ||
| 123 | return Charset.forName((String)name).newEncoder(); | ||
| 124 | if (name instanceof Charset) | ||
| 125 | return ((Charset)name).newEncoder(); | ||
| 126 | assert false; | ||
| 127 | return null; | ||
| 128 | } | ||
| 129 | }; | ||
| 130 | |||
| 131 | public static CharsetEncoder encoderFor(Object name) { | ||
| 132 | CharsetEncoder ce = (CharsetEncoder)encoderCache.forName(name); | ||
| 133 | ce.reset(); | ||
| 134 | return ce; | ||
| 135 | } | ||
| 136 | |||
| 137 | } | ||