jdk8-mips64-public/langtools: src/share/classes/com/sun/tools/javac/util/BaseFileManager.java@4011f49b4af8

     1 /*

     2  * Copyright 2009 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  */

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

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

    29 import com.sun.tools.javac.main.JavacOption;

    30 import com.sun.tools.javac.main.OptionName;

    31 import com.sun.tools.javac.main.RecognizedOptions;

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

    33 import java.io.ByteArrayOutputStream;

    34 import java.io.Closeable;

    35 import java.io.IOException;

    36 import java.io.InputStream;

    37 import java.io.OutputStreamWriter;

    38 import java.lang.ref.SoftReference;

    39 import java.lang.reflect.Constructor;

    40 import java.net.URL;

    41 import java.net.URLClassLoader;

    42 import java.nio.ByteBuffer;

    43 import java.nio.CharBuffer;

    44 import java.nio.charset.Charset;

    45 import java.nio.charset.CharsetDecoder;

    46 import java.nio.charset.CoderResult;

    47 import java.nio.charset.CodingErrorAction;

    48 import java.nio.charset.IllegalCharsetNameException;

    49 import java.nio.charset.UnsupportedCharsetException;

    50 import java.util.Collection;

    51 import java.util.HashMap;

    52 import java.util.Iterator;

    53 import java.util.Map;

    54 import javax.tools.JavaFileObject;

    55 import javax.tools.JavaFileObject.Kind;

    57 /**

    58  * Utility methods for building a filemanager.

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

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

    61  */

    62 public class BaseFileManager {

    63     protected BaseFileManager(Charset charset) {

    64         this.charset = charset;

    65         byteBufferCache = new ByteBufferCache();

    66     }

    68     /**

    69      * Set the context for JavacPathFileManager.

    70      */

    71     protected void setContext(Context context) {

    72         log = Log.instance(context);

    73         options = Options.instance(context);

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

    75     }

    77     /**

    78      * The log to be used for error reporting.

    79      */

    80     public Log log;

    82     /**

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

    84      */

    85     protected Charset charset;

    87     protected Options options;

    89     protected String classLoaderClass;

    91     protected Source getSource() {

    92         String sourceName = options.get(OptionName.SOURCE);

    93         Source source = null;

    94         if (sourceName != null)

    95             source = Source.lookup(sourceName);

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

    97     }

    99     protected ClassLoader getClassLoader(URL[] urls) {

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

   102         // Bug: 6558476

   103         // Ideally, ClassLoader should be Closeable, but before JDK7 it is not.

   104         // On older versions, try the following, to get a closeable classloader.

   106         // 1: Allow client to specify the class to use via hidden option

   107         if (classLoaderClass != null) {

   108             try {

   109                 Class<? extends ClassLoader> loader =

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

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

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

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

   114             } catch (Throwable t) {

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

   116             }

   117         }

   119         // 2: If URLClassLoader implements Closeable, use that.

   120         if (Closeable.class.isAssignableFrom(URLClassLoader.class))

   121             return new URLClassLoader(urls, thisClassLoader);

   123         // 3: Try using private reflection-based CloseableURLClassLoader

   124         try {

   125             return new CloseableURLClassLoader(urls, thisClassLoader);

   126         } catch (Throwable t) {

   127             // ignore errors loading workaround class loader, fall through

   128         }

   130         // 4: If all else fails, use plain old standard URLClassLoader

   131         return new URLClassLoader(urls, thisClassLoader);

   132     }

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

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

   136         for (JavacOption o: javacFileManagerOptions) {

   137             if (o.matches(current))  {

   138                 if (o.hasArg()) {

   139                     if (remaining.hasNext()) {

   140                         if (!o.process(options, current, remaining.next()))

   141                             return true;

   142                     }

   143                 } else {

   144                     if (!o.process(options, current))

   145                         return true;

   146                 }

   147                 // operand missing, or process returned false

   148                 throw new IllegalArgumentException(current);

   149             }

   150         }

   152         return false;

   153     }

   154     // where

   155         private static JavacOption[] javacFileManagerOptions =

   156             RecognizedOptions.getJavacFileManagerOptions(

   157             new RecognizedOptions.GrumpyHelper());

   159     public int isSupportedOption(String option) {

   160         for (JavacOption o : javacFileManagerOptions) {

   161             if (o.matches(option))

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

   163         }

   164         return -1;

   165     }

   166     // </editor-fold>

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

   169     private String defaultEncodingName;

   170     private String getDefaultEncodingName() {

   171         if (defaultEncodingName == null) {

   172             defaultEncodingName =

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

   174         }

   175         return defaultEncodingName;

   176     }

   178     public String getEncodingName() {

   179         String encName = options.get(OptionName.ENCODING);

   180         if (encName == null)

   181             return getDefaultEncodingName();

   182         else

   183             return encName;

   184     }

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

   187         String encodingName = getEncodingName();

   188         CharsetDecoder decoder;

   189         try {

   190             decoder = getDecoder(encodingName, ignoreEncodingErrors);

   191         } catch (IllegalCharsetNameException e) {

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

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

   194         } catch (UnsupportedCharsetException e) {

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

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

   197         }

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

   200         float factor =

   201             decoder.averageCharsPerByte() * 0.8f +

   202             decoder.maxCharsPerByte() * 0.2f;

   203         CharBuffer dest = CharBuffer.

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

   206         while (true) {

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

   208             dest.flip();

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

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

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

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

   214                     dest.flip();

   215                 }

   216                 return dest;

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

   218                 int newCapacity =

   219                     10 + dest.capacity() +

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

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

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

   223                 // bad character in input

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

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

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

   228                               "illegal.char.for.encoding",

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

   230                 } else {

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

   232                                 "illegal.char.for.encoding",

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

   234                 }

   236                 // skip past the coding error

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

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

   240                 // for more translation

   241                 dest.position(dest.limit());

   242                 dest.limit(dest.capacity());

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

   244             } else {

   245                 throw new AssertionError(result);

   246             }

   247         }

   248         // unreached

   249     }

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

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

   253             ? Charset.forName(encodingName)

   254             : this.charset;

   255         CharsetDecoder decoder = cs.newDecoder();

   257         CodingErrorAction action;

   258         if (ignoreEncodingErrors)

   259             action = CodingErrorAction.REPLACE;

   260         else

   261             action = CodingErrorAction.REPORT;

   263         return decoder

   264             .onMalformedInput(action)

   265             .onUnmappableCharacter(action);

   266     }

   267     // </editor-fold>

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

   270     /**

   271      * Make a byte buffer from an input stream.

   272      */

   273     public ByteBuffer makeByteBuffer(InputStream in)

   274         throws IOException {

   275         int limit = in.available();

   276         if (limit < 1024) limit = 1024;

   277         ByteBuffer result = byteBufferCache.get(limit);

   278         int position = 0;

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

   280             if (position >= limit)

   281                 // expand buffer

   282                 result = ByteBuffer.

   283                     allocate(limit <<= 1).

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

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

   286                 position,

   287                 limit - position);

   288             if (count < 0) break;

   289             result.position(position += count);

   290         }

   291         return (ByteBuffer)result.flip();

   292     }

   294     public void recycleByteBuffer(ByteBuffer bb) {

   295         byteBufferCache.put(bb);

   296     }

   298     /**

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

   300      */

   301     private static class ByteBufferCache {

   302         private ByteBuffer cached;

   303         ByteBuffer get(int capacity) {

   304             if (capacity < 20480) capacity = 20480;

   305             ByteBuffer result =

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

   307                 ? (ByteBuffer)cached.clear()

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

   309             cached = null;

   310             return result;

   311         }

   312         void put(ByteBuffer x) {

   313             cached = x;

   314         }

   315     }

   317     private final ByteBufferCache byteBufferCache;

   318     // </editor-fold>

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

   321     public CharBuffer getCachedContent(JavaFileObject file) {

   322         SoftReference<CharBuffer> r = contentCache.get(file);

   323         return (r == null ? null : r.get());

   324     }

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

   327         contentCache.put(file, new SoftReference<CharBuffer>(cb));

   328     }

   330     protected final Map<JavaFileObject, SoftReference<CharBuffer>> contentCache

   331             = new HashMap<JavaFileObject, SoftReference<CharBuffer>>();

   332     // </editor-fold>

   334     public static Kind getKind(String name) {

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

   336             return Kind.CLASS;

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

   338             return Kind.SOURCE;

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

   340             return Kind.HTML;

   341         else

   342             return Kind.OTHER;

   343     }

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

   346         o.getClass(); // null check

   347         return o;

   348     }

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

   351         for (T t : it)

   352             t.getClass(); // null check

   353         return it;

   354     }

   355 }

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

src/share/classes/com/sun/tools/javac/util/BaseFileManager.java@4011f49b4af8

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