jdk8-mips64-public/langtools: src/share/classes/com/sun/tools/javac/util/BaseFileManager.java@959103a6100f

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http://hg.openjdk.java.net/jdk8u/jdk8u/langtools/
changeset: 2573:53ca196be1ae
tag: jdk8u25-b17

     1 /*

     2  * Copyright (c) 2009, 2013, 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.util;

    28 import java.io.ByteArrayOutputStream;

    29 import java.io.Closeable;

    30 import java.io.IOException;

    31 import java.io.InputStream;

    32 import java.io.OutputStreamWriter;

    33 import java.lang.ref.SoftReference;

    34 import java.lang.reflect.Constructor;

    35 import java.net.URL;

    36 import java.net.URLClassLoader;

    37 import java.nio.ByteBuffer;

    38 import java.nio.CharBuffer;

    39 import java.nio.charset.Charset;

    40 import java.nio.charset.CharsetDecoder;

    41 import java.nio.charset.CoderResult;

    42 import java.nio.charset.CodingErrorAction;

    43 import java.nio.charset.IllegalCharsetNameException;

    44 import java.nio.charset.UnsupportedCharsetException;

    45 import java.util.Collection;

    46 import java.util.HashMap;

    47 import java.util.Iterator;

    48 import java.util.Map;

    49 import java.util.Set;

    50 import javax.tools.JavaFileObject;

    51 import javax.tools.JavaFileObject.Kind;

    53 import com.sun.tools.javac.code.Lint;

    54 import com.sun.tools.javac.code.Source;

    55 import com.sun.tools.javac.file.FSInfo;

    56 import com.sun.tools.javac.file.Locations;

    57 import com.sun.tools.javac.main.Option;

    58 import com.sun.tools.javac.main.OptionHelper;

    59 import com.sun.tools.javac.main.OptionHelper.GrumpyHelper;

    60 import com.sun.tools.javac.util.JCDiagnostic.SimpleDiagnosticPosition;

    62 /**

    63  * Utility methods for building a filemanager.

    64  * There are no references here to file-system specific objects such as

    65  * java.io.File or java.nio.file.Path.

    66  */

    67 public abstract class BaseFileManager {

    68     protected BaseFileManager(Charset charset) {

    69         this.charset = charset;

    70         byteBufferCache = new ByteBufferCache();

    71         locations = createLocations();

    72     }

    74     /**

    75      * Set the context for JavacPathFileManager.

    76      */

    77     public void setContext(Context context) {

    78         log = Log.instance(context);

    79         options = Options.instance(context);

    80         classLoaderClass = options.get("procloader");

    81         locations.update(log, options, Lint.instance(context), FSInfo.instance(context));

    82     }

    84     protected Locations createLocations() {

    85         return new Locations();

    86     }

    88     /**

    89      * The log to be used for error reporting.

    90      */

    91     public Log log;

    93     /**

    94      * User provided charset (through javax.tools).

    95      */

    96     protected Charset charset;

    98     protected Options options;

   100     protected String classLoaderClass;

   102     protected Locations locations;

   104     protected Source getSource() {

   105         String sourceName = options.get(Option.SOURCE);

   106         Source source = null;

   107         if (sourceName != null)

   108             source = Source.lookup(sourceName);

   109         return (source != null ? source : Source.DEFAULT);

   110     }

   112     protected ClassLoader getClassLoader(URL[] urls) {

   113         ClassLoader thisClassLoader = getClass().getClassLoader();

   115         // Allow the following to specify a closeable classloader

   116         // other than URLClassLoader.

   118         // 1: Allow client to specify the class to use via hidden option

   119         if (classLoaderClass != null) {

   120             try {

   121                 Class<? extends ClassLoader> loader =

   122                         Class.forName(classLoaderClass).asSubclass(ClassLoader.class);

   123                 Class<?>[] constrArgTypes = { URL[].class, ClassLoader.class };

   124                 Constructor<? extends ClassLoader> constr = loader.getConstructor(constrArgTypes);

   125                 return constr.newInstance(new Object[] { urls, thisClassLoader });

   126             } catch (Throwable t) {

   127                 // ignore errors loading user-provided class loader, fall through

   128             }

   129         }

   130         return new URLClassLoader(urls, thisClassLoader);

   131     }

   133     // <editor-fold defaultstate="collapsed" desc="Option handling">

   134     public boolean handleOption(String current, Iterator<String> remaining) {

   135         OptionHelper helper = new GrumpyHelper(log) {

   136             @Override

   137             public String get(Option option) {

   138                 return options.get(option.getText());

   139             }

   141             @Override

   142             public void put(String name, String value) {

   143                 options.put(name, value);

   144             }

   146             @Override

   147             public void remove(String name) {

   148                 options.remove(name);

   149             }

   150         };

   151         for (Option o: javacFileManagerOptions) {

   152             if (o.matches(current))  {

   153                 if (o.hasArg()) {

   154                     if (remaining.hasNext()) {

   155                         if (!o.process(helper, current, remaining.next()))

   156                             return true;

   157                     }

   158                 } else {

   159                     if (!o.process(helper, current))

   160                         return true;

   161                 }

   162                 // operand missing, or process returned false

   163                 throw new IllegalArgumentException(current);

   164             }

   165         }

   167         return false;

   168     }

   169     // where

   170         private static final Set<Option> javacFileManagerOptions =

   171             Option.getJavacFileManagerOptions();

   173     public int isSupportedOption(String option) {

   174         for (Option o : javacFileManagerOptions) {

   175             if (o.matches(option))

   176                 return o.hasArg() ? 1 : 0;

   177         }

   178         return -1;

   179     }

   181     public abstract boolean isDefaultBootClassPath();

   183     // </editor-fold>

   185     // <editor-fold defaultstate="collapsed" desc="Encoding">

   186     private String defaultEncodingName;

   187     private String getDefaultEncodingName() {

   188         if (defaultEncodingName == null) {

   189             defaultEncodingName =

   190                 new OutputStreamWriter(new ByteArrayOutputStream()).getEncoding();

   191         }

   192         return defaultEncodingName;

   193     }

   195     public String getEncodingName() {

   196         String encName = options.get(Option.ENCODING);

   197         if (encName == null)

   198             return getDefaultEncodingName();

   199         else

   200             return encName;

   201     }

   203     public CharBuffer decode(ByteBuffer inbuf, boolean ignoreEncodingErrors) {

   204         String encodingName = getEncodingName();

   205         CharsetDecoder decoder;

   206         try {

   207             decoder = getDecoder(encodingName, ignoreEncodingErrors);

   208         } catch (IllegalCharsetNameException e) {

   209             log.error("unsupported.encoding", encodingName);

   210             return (CharBuffer)CharBuffer.allocate(1).flip();

   211         } catch (UnsupportedCharsetException e) {

   212             log.error("unsupported.encoding", encodingName);

   213             return (CharBuffer)CharBuffer.allocate(1).flip();

   214         }

   216         // slightly overestimate the buffer size to avoid reallocation.

   217         float factor =

   218             decoder.averageCharsPerByte() * 0.8f +

   219             decoder.maxCharsPerByte() * 0.2f;

   220         CharBuffer dest = CharBuffer.

   221             allocate(10 + (int)(inbuf.remaining()*factor));

   223         while (true) {

   224             CoderResult result = decoder.decode(inbuf, dest, true);

   225             dest.flip();

   227             if (result.isUnderflow()) { // done reading

   228                 // make sure there is at least one extra character

   229                 if (dest.limit() == dest.capacity()) {

   230                     dest = CharBuffer.allocate(dest.capacity()+1).put(dest);

   231                     dest.flip();

   232                 }

   233                 return dest;

   234             } else if (result.isOverflow()) { // buffer too small; expand

   235                 int newCapacity =

   236                     10 + dest.capacity() +

   237                     (int)(inbuf.remaining()*decoder.maxCharsPerByte());

   238                 dest = CharBuffer.allocate(newCapacity).put(dest);

   239             } else if (result.isMalformed() || result.isUnmappable()) {

   240                 // bad character in input

   242                 // report coding error (warn only pre 1.5)

   243                 if (!getSource().allowEncodingErrors()) {

   244                     log.error(new SimpleDiagnosticPosition(dest.limit()),

   245                               "illegal.char.for.encoding",

   246                               charset == null ? encodingName : charset.name());

   247                 } else {

   248                     log.warning(new SimpleDiagnosticPosition(dest.limit()),

   249                                 "illegal.char.for.encoding",

   250                                 charset == null ? encodingName : charset.name());

   251                 }

   253                 // skip past the coding error

   254                 inbuf.position(inbuf.position() + result.length());

   256                 // undo the flip() to prepare the output buffer

   257                 // for more translation

   258                 dest.position(dest.limit());

   259                 dest.limit(dest.capacity());

   260                 dest.put((char)0xfffd); // backward compatible

   261             } else {

   262                 throw new AssertionError(result);

   263             }

   264         }

   265         // unreached

   266     }

   268     public CharsetDecoder getDecoder(String encodingName, boolean ignoreEncodingErrors) {

   269         Charset cs = (this.charset == null)

   270             ? Charset.forName(encodingName)

   271             : this.charset;

   272         CharsetDecoder decoder = cs.newDecoder();

   274         CodingErrorAction action;

   275         if (ignoreEncodingErrors)

   276             action = CodingErrorAction.REPLACE;

   277         else

   278             action = CodingErrorAction.REPORT;

   280         return decoder

   281             .onMalformedInput(action)

   282             .onUnmappableCharacter(action);

   283     }

   284     // </editor-fold>

   286     // <editor-fold defaultstate="collapsed" desc="ByteBuffers">

   287     /**

   288      * Make a byte buffer from an input stream.

   289      */

   290     public ByteBuffer makeByteBuffer(InputStream in)

   291         throws IOException {

   292         int limit = in.available();

   293         if (limit < 1024) limit = 1024;

   294         ByteBuffer result = byteBufferCache.get(limit);

   295         int position = 0;

   296         while (in.available() != 0) {

   297             if (position >= limit)

   298                 // expand buffer

   299                 result = ByteBuffer.

   300                     allocate(limit <<= 1).

   301                     put((ByteBuffer)result.flip());

   302             int count = in.read(result.array(),

   303                 position,

   304                 limit - position);

   305             if (count < 0) break;

   306             result.position(position += count);

   307         }

   308         return (ByteBuffer)result.flip();

   309     }

   311     public void recycleByteBuffer(ByteBuffer bb) {

   312         byteBufferCache.put(bb);

   313     }

   315     /**

   316      * A single-element cache of direct byte buffers.

   317      */

   318     private static class ByteBufferCache {

   319         private ByteBuffer cached;

   320         ByteBuffer get(int capacity) {

   321             if (capacity < 20480) capacity = 20480;

   322             ByteBuffer result =

   323                 (cached != null && cached.capacity() >= capacity)

   324                 ? (ByteBuffer)cached.clear()

   325                 : ByteBuffer.allocate(capacity + capacity>>1);

   326             cached = null;

   327             return result;

   328         }

   329         void put(ByteBuffer x) {

   330             cached = x;

   331         }

   332     }

   334     private final ByteBufferCache byteBufferCache;

   335     // </editor-fold>

   337     // <editor-fold defaultstate="collapsed" desc="Content cache">

   338     public CharBuffer getCachedContent(JavaFileObject file) {

   339         ContentCacheEntry e = contentCache.get(file);

   340         if (e == null)

   341             return null;

   343         if (!e.isValid(file)) {

   344             contentCache.remove(file);

   345             return null;

   346         }

   348         return e.getValue();

   349     }

   351     public void cache(JavaFileObject file, CharBuffer cb) {

   352         contentCache.put(file, new ContentCacheEntry(file, cb));

   353     }

   355     public void flushCache(JavaFileObject file) {

   356         contentCache.remove(file);

   357     }

   359     protected final Map<JavaFileObject, ContentCacheEntry> contentCache

   360             = new HashMap<JavaFileObject, ContentCacheEntry>();

   362     protected static class ContentCacheEntry {

   363         final long timestamp;

   364         final SoftReference<CharBuffer> ref;

   366         ContentCacheEntry(JavaFileObject file, CharBuffer cb) {

   367             this.timestamp = file.getLastModified();

   368             this.ref = new SoftReference<CharBuffer>(cb);

   369         }

   371         boolean isValid(JavaFileObject file) {

   372             return timestamp == file.getLastModified();

   373         }

   375         CharBuffer getValue() {

   376             return ref.get();

   377         }

   378     }

   379     // </editor-fold>

   381     public static Kind getKind(String name) {

   382         if (name.endsWith(Kind.CLASS.extension))

   383             return Kind.CLASS;

   384         else if (name.endsWith(Kind.SOURCE.extension))

   385             return Kind.SOURCE;

   386         else if (name.endsWith(Kind.HTML.extension))

   387             return Kind.HTML;

   388         else

   389             return Kind.OTHER;

   390     }

   392     protected static <T> T nullCheck(T o) {

   393         o.getClass(); // null check

   394         return o;

   395     }

   397     protected static <T> Collection<T> nullCheck(Collection<T> it) {

   398         for (T t : it)

   399             t.getClass(); // null check

   400         return it;

   401     }

   402 }

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

src/share/classes/com/sun/tools/javac/util/BaseFileManager.java@959103a6100f

src/share/classes/com/sun/tools/javac/util/BaseFileManager.java