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src/share/classes/com/sun/tools/javac/file/CacheFSInfo.java@2eb010b6cb22 (annotated)

src/share/classes/com/sun/tools/javac/file/CacheFSInfo.java

Thu, 31 Aug 2017 15:17:03 +0800

author

aoqi

date

Thu, 31 Aug 2017 15:17:03 +0800

changeset 2525

2eb010b6cb22

parent 893

8f0dcb9499db

parent 0

959103a6100f

permissions

-rw-r--r--

merge

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 2005, 2011, Oracle and/or its affiliates. All rights reserved.
aoqi@0	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0	4	*
aoqi@0	5	* This code is free software; you can redistribute it and/or modify it
aoqi@0	6	* under the terms of the GNU General Public License version 2 only, as
aoqi@0	7	* published by the Free Software Foundation. Oracle designates this
aoqi@0	8	* particular file as subject to the "Classpath" exception as provided
aoqi@0	9	* by Oracle in the LICENSE file that accompanied this code.
aoqi@0	10	*
aoqi@0	11	* This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0	12	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0	13	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
aoqi@0	14	* version 2 for more details (a copy is included in the LICENSE file that
aoqi@0	15	* accompanied this code).
aoqi@0	16	*
aoqi@0	17	* You should have received a copy of the GNU General Public License version
aoqi@0	18	* 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0	19	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0	20	*
aoqi@0	21	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0	22	* or visit www.oracle.com if you need additional information or have any
aoqi@0	23	* questions.
aoqi@0	24	*/
aoqi@0	25
aoqi@0	26	package com.sun.tools.javac.file;
aoqi@0	27
aoqi@0	28	import java.io.File;
aoqi@0	29	import java.io.IOException;
aoqi@0	30	import java.util.List;
aoqi@0	31	import java.util.Map;
aoqi@0	32	import java.util.concurrent.ConcurrentHashMap;
aoqi@0	33
aoqi@0	34	import com.sun.tools.javac.util.Context;
aoqi@0	35
aoqi@0	36	/**
aoqi@0	37	* Caching implementation of FSInfo.
aoqi@0	38	*
aoqi@0	39	* <p><b>This is NOT part of any supported API.
aoqi@0	40	* If you write code that depends on this, you do so at your own risk.
aoqi@0	41	* This code and its internal interfaces are subject to change or
aoqi@0	42	* deletion without notice.</b>
aoqi@0	43	*/
aoqi@0	44	public class CacheFSInfo extends FSInfo {
aoqi@0	45
aoqi@0	46	/**
aoqi@0	47	* Register a Context.Factory to create a CacheFSInfo.
aoqi@0	48	*/
aoqi@0	49	public static void preRegister(Context context) {
aoqi@0	50	context.put(FSInfo.class, new Context.Factory<FSInfo>() {
aoqi@0	51	public FSInfo make(Context c) {
aoqi@0	52	FSInfo instance = new CacheFSInfo();
aoqi@0	53	c.put(FSInfo.class, instance);
aoqi@0	54	return instance;
aoqi@0	55	}
aoqi@0	56	});
aoqi@0	57	}
aoqi@0	58
aoqi@0	59	public void clearCache() {
aoqi@0	60	cache.clear();
aoqi@0	61	}
aoqi@0	62
aoqi@0	63	@Override
aoqi@0	64	public File getCanonicalFile(File file) {
aoqi@0	65	Entry e = getEntry(file);
aoqi@0	66	return e.canonicalFile;
aoqi@0	67	}
aoqi@0	68
aoqi@0	69	@Override
aoqi@0	70	public boolean exists(File file) {
aoqi@0	71	Entry e = getEntry(file);
aoqi@0	72	return e.exists;
aoqi@0	73	}
aoqi@0	74
aoqi@0	75	@Override
aoqi@0	76	public boolean isDirectory(File file) {
aoqi@0	77	Entry e = getEntry(file);
aoqi@0	78	return e.isDirectory;
aoqi@0	79	}
aoqi@0	80
aoqi@0	81	@Override
aoqi@0	82	public boolean isFile(File file) {
aoqi@0	83	Entry e = getEntry(file);
aoqi@0	84	return e.isFile;
aoqi@0	85	}
aoqi@0	86
aoqi@0	87	@Override
aoqi@0	88	public List<File> getJarClassPath(File file) throws IOException {
aoqi@0	89	// don't bother to lock the cache, because it is thread-safe, and
aoqi@0	90	// because the worst that can happen would be to create two identical
aoqi@0	91	// jar class paths together and have one overwrite the other.
aoqi@0	92	Entry e = getEntry(file);
aoqi@0	93	if (e.jarClassPath == null)
aoqi@0	94	e.jarClassPath = super.getJarClassPath(file);
aoqi@0	95	return e.jarClassPath;
aoqi@0	96	}
aoqi@0	97
aoqi@0	98	private Entry getEntry(File file) {
aoqi@0	99	// don't bother to lock the cache, because it is thread-safe, and
aoqi@0	100	// because the worst that can happen would be to create two identical
aoqi@0	101	// entries together and have one overwrite the other.
aoqi@0	102	Entry e = cache.get(file);
aoqi@0	103	if (e == null) {
aoqi@0	104	e = new Entry();
aoqi@0	105	e.canonicalFile = super.getCanonicalFile(file);
aoqi@0	106	e.exists = super.exists(file);
aoqi@0	107	e.isDirectory = super.isDirectory(file);
aoqi@0	108	e.isFile = super.isFile(file);
aoqi@0	109	cache.put(file, e);
aoqi@0	110	}
aoqi@0	111	return e;
aoqi@0	112	}
aoqi@0	113
aoqi@0	114	// could also be a Map<File,SoftReference<Entry>> ?
aoqi@0	115	private Map<File,Entry> cache = new ConcurrentHashMap<File,Entry>();
aoqi@0	116
aoqi@0	117	private static class Entry {
aoqi@0	118	File canonicalFile;
aoqi@0	119	boolean exists;
aoqi@0	120	boolean isFile;
aoqi@0	121	boolean isDirectory;
aoqi@0	122	List<File> jarClassPath;
aoqi@0	123	}
aoqi@0	124	}