jdk8-mips64-public/langtools: src/share/classes/com/sun/tools/javac/file/CacheFSInfo.java@99d23c0ef8ee

7196464: upgrade JavaCompiler.shouldStopPolicy to accomodate policies in face of error and no error
Reviewed-by: mcimadamore

     1 /*

     2  * Copyright (c) 2005, 2011, 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  */

    26 package com.sun.tools.javac.file;

    28 import java.io.File;

    29 import java.io.IOException;

    30 import java.util.List;

    31 import java.util.Map;

    32 import java.util.concurrent.ConcurrentHashMap;

    34 import com.sun.tools.javac.util.Context;

    36 /**

    37  * Caching implementation of FSInfo.

    38  *

    39  * <p><b>This is NOT part of any supported API.

    40  * If you write code that depends on this, you do so at your own risk.

    41  * This code and its internal interfaces are subject to change or

    42  * deletion without notice.</b>

    43  */

    44 public class CacheFSInfo extends FSInfo {

    46     /**

    47      * Register a Context.Factory to create a CacheFSInfo.

    48      */

    49     public static void preRegister(Context context) {

    50         context.put(FSInfo.class, new Context.Factory<FSInfo>() {

    51             public FSInfo make(Context c) {

    52                 FSInfo instance = new CacheFSInfo();

    53                 c.put(FSInfo.class, instance);

    54                 return instance;

    55             }

    56         });

    57     }

    59     public void clearCache() {

    60         cache.clear();

    61     }

    63     @Override

    64     public File getCanonicalFile(File file) {

    65         Entry e = getEntry(file);

    66         return e.canonicalFile;

    67     }

    69     @Override

    70     public boolean exists(File file) {

    71         Entry e = getEntry(file);

    72         return e.exists;

    73     }

    75     @Override

    76     public boolean isDirectory(File file) {

    77         Entry e = getEntry(file);

    78         return e.isDirectory;

    79     }

    81     @Override

    82     public boolean isFile(File file) {

    83         Entry e = getEntry(file);

    84         return e.isFile;

    85     }

    87     @Override

    88     public List<File> getJarClassPath(File file) throws IOException {

    89         // don't bother to lock the cache, because it is thread-safe, and

    90         // because the worst that can happen would be to create two identical

    91         // jar class paths together and have one overwrite the other.

    92         Entry e = getEntry(file);

    93         if (e.jarClassPath == null)

    94             e.jarClassPath = super.getJarClassPath(file);

    95         return e.jarClassPath;

    96     }

    98     private Entry getEntry(File file) {

    99         // don't bother to lock the cache, because it is thread-safe, and

   100         // because the worst that can happen would be to create two identical

   101         // entries together and have one overwrite the other.

   102         Entry e = cache.get(file);

   103         if (e == null) {

   104             e = new Entry();

   105             e.canonicalFile = super.getCanonicalFile(file);

   106             e.exists = super.exists(file);

   107             e.isDirectory = super.isDirectory(file);

   108             e.isFile = super.isFile(file);

   109             cache.put(file, e);

   110         }

   111         return e;

   112     }

   114     // could also be a Map<File,SoftReference<Entry>> ?

   115     private Map<File,Entry> cache = new ConcurrentHashMap<File,Entry>();

   117     private static class Entry {

   118         File canonicalFile;

   119         boolean exists;

   120         boolean isFile;

   121         boolean isDirectory;

   122         List<File> jarClassPath;

   123     }

   124 }

Mercurial > jdk8-mips64-public > langtools / file revision