Mercurial > jdk8-mips64-public > langtools / file comparison
comparison: src/share/classes/com/sun/tools/javac/file/CacheFSInfo.java
src/share/classes/com/sun/tools/javac/file/CacheFSInfo.java
- changeset 106
- ceaa6549687a
- child 333
- 7c2d6da61646
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| 104:5e89c4ca637c | 106:ceaa6549687a |
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| 1 /* | |
| 2 * Copyright 2005-2008 Sun Microsystems, Inc. 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. Sun designates this | |
| 8 * particular file as subject to the "Classpath" exception as provided | |
| 9 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 22 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 23 * have any questions. | |
| 24 */ | |
| 25 | |
| 26 package com.sun.tools.javac.file; | |
| 27 | |
| 28 import java.io.File; | |
| 29 import java.io.IOException; | |
| 30 import java.util.List; | |
| 31 | |
| 32 import com.sun.tools.javac.util.Context; | |
| 33 import java.util.Map; | |
| 34 import java.util.concurrent.ConcurrentHashMap; | |
| 35 | |
| 36 /** | |
| 37 * Caching implementation of FSInfo | |
| 38 */ | |
| 39 public class CacheFSInfo extends FSInfo { | |
| 40 | |
| 41 /** | |
| 42 * Register a Context.Factory to create a singleton CacheFSInfo. | |
| 43 */ | |
| 44 public static void preRegister(final Context context) { | |
| 45 context.put(FSInfo.class, new Context.Factory<FSInfo>() { | |
| 46 public FSInfo make() { | |
| 47 if (singleton == null) | |
| 48 singleton = new CacheFSInfo(); | |
| 49 context.put(FSInfo.class, singleton); | |
| 50 return singleton; | |
| 51 } | |
| 52 }); | |
| 53 } | |
| 54 | |
| 55 static CacheFSInfo singleton; | |
| 56 | |
| 57 public void clearCache() { | |
| 58 cache.clear(); | |
| 59 } | |
| 60 | |
| 61 @Override | |
| 62 public File getCanonicalFile(File file) { | |
| 63 Entry e = getEntry(file); | |
| 64 return e.canonicalFile; | |
| 65 } | |
| 66 | |
| 67 @Override | |
| 68 public boolean exists(File file) { | |
| 69 Entry e = getEntry(file); | |
| 70 return e.exists; | |
| 71 } | |
| 72 | |
| 73 @Override | |
| 74 public boolean isDirectory(File file) { | |
| 75 Entry e = getEntry(file); | |
| 76 return e.isDirectory; | |
| 77 } | |
| 78 | |
| 79 @Override | |
| 80 public boolean isFile(File file) { | |
| 81 Entry e = getEntry(file); | |
| 82 return e.isFile; | |
| 83 } | |
| 84 | |
| 85 @Override | |
| 86 public List<File> getJarClassPath(File file) throws IOException { | |
| 87 // don't bother to lock the cache, because it is thread-safe, and | |
| 88 // because the worst that can happen would be to create two identical | |
| 89 // jar class paths together and have one overwrite the other. | |
| 90 Entry e = getEntry(file); | |
| 91 if (e.jarClassPath == null) | |
| 92 e.jarClassPath = super.getJarClassPath(file); | |
| 93 return e.jarClassPath; | |
| 94 } | |
| 95 | |
| 96 private Entry getEntry(File file) { | |
| 97 // don't bother to lock the cache, because it is thread-safe, and | |
| 98 // because the worst that can happen would be to create two identical | |
| 99 // entries together and have one overwrite the other. | |
| 100 Entry e = cache.get(file); | |
| 101 if (e == null) { | |
| 102 e = new Entry(); | |
| 103 e.canonicalFile = super.getCanonicalFile(file); | |
| 104 e.exists = super.exists(file); | |
| 105 e.isDirectory = super.isDirectory(file); | |
| 106 e.isFile = super.isFile(file); | |
| 107 cache.put(file, e); | |
| 108 } | |
| 109 return e; | |
| 110 } | |
| 111 | |
| 112 // could also be a Map<File,SoftReference<Entry>> ? | |
| 113 private Map<File,Entry> cache = new ConcurrentHashMap<File,Entry>(); | |
| 114 | |
| 115 private static class Entry { | |
| 116 File canonicalFile; | |
| 117 boolean exists; | |
| 118 boolean isFile; | |
| 119 boolean isDirectory; | |
| 120 List<File> jarClassPath; | |
| 121 } | |
| 122 } |
