125 lines
4.0 KiB
Java
125 lines
4.0 KiB
Java
/*
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* Copyright (c) 2005, 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 com.sun.tools.javac.file;
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import java.io.File;
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import java.io.IOException;
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import java.util.List;
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import java.util.Map;
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import java.util.concurrent.ConcurrentHashMap;
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import com.sun.tools.javac.util.Context;
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/**
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* Caching implementation of FSInfo.
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*
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* <p><b>This is NOT part of any supported API.
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* If you write code that depends on this, you do so at your own risk.
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* This code and its internal interfaces are subject to change or
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* deletion without notice.</b>
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*/
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public class CacheFSInfo extends FSInfo {
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/**
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* Register a Context.Factory to create a CacheFSInfo.
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*/
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public static void preRegister(Context context) {
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context.put(FSInfo.class, new Context.Factory<FSInfo>() {
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public FSInfo make(Context c) {
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FSInfo instance = new CacheFSInfo();
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c.put(FSInfo.class, instance);
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return instance;
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}
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});
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}
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public void clearCache() {
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cache.clear();
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}
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@Override
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public File getCanonicalFile(File file) {
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Entry e = getEntry(file);
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return e.canonicalFile;
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}
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@Override
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public boolean exists(File file) {
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Entry e = getEntry(file);
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return e.exists;
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}
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@Override
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public boolean isDirectory(File file) {
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Entry e = getEntry(file);
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return e.isDirectory;
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}
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@Override
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public boolean isFile(File file) {
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Entry e = getEntry(file);
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return e.isFile;
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}
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@Override
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public List<File> getJarClassPath(File file) throws IOException {
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// don't bother to lock the cache, because it is thread-safe, and
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// because the worst that can happen would be to create two identical
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// jar class paths together and have one overwrite the other.
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Entry e = getEntry(file);
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if (e.jarClassPath == null)
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e.jarClassPath = super.getJarClassPath(file);
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return e.jarClassPath;
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}
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private Entry getEntry(File file) {
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// don't bother to lock the cache, because it is thread-safe, and
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// because the worst that can happen would be to create two identical
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// entries together and have one overwrite the other.
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Entry e = cache.get(file);
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if (e == null) {
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e = new Entry();
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e.canonicalFile = super.getCanonicalFile(file);
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e.exists = super.exists(file);
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e.isDirectory = super.isDirectory(file);
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e.isFile = super.isFile(file);
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cache.put(file, e);
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}
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return e;
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}
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// could also be a Map<File,SoftReference<Entry>> ?
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private Map<File,Entry> cache = new ConcurrentHashMap<File,Entry>();
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private static class Entry {
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File canonicalFile;
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boolean exists;
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boolean isFile;
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boolean isDirectory;
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List<File> jarClassPath;
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}
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}
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