jdk8-mips64-public/langtools: src/share/classes/com/sun/tools/javac/util/BaseFileManager.java@7375d4979bd3

     1 /*

     2  * Copyright (c) 2009, 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.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 javax.tools.JavaFileObject;

    50 import javax.tools.JavaFileObject.Kind;

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

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

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

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

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

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

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

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

    61 /**

    62  * Utility methods for building a filemanager.

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

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

    65  */

    66 public abstract class BaseFileManager {

    67     protected BaseFileManager(Charset charset) {

    68         this.charset = charset;

    69         byteBufferCache = new ByteBufferCache();

    70         locations = createLocations();

    71     }

    73     /**

    74      * Set the context for JavacPathFileManager.

    75      */

    76     public void setContext(Context context) {

    77         log = Log.instance(context);

    78         options = Options.instance(context);

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

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

    81     }

    83     protected Locations createLocations() {

    84         return new Locations();

    85     }

    87     /**

    88      * The log to be used for error reporting.

    89      */

    90     public Log log;

    92     /**

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

    94      */

    95     protected Charset charset;

    97     protected Options options;

    99     protected String classLoaderClass;

   101     protected Locations locations;

   103     protected Source getSource() {

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

   105         Source source = null;

   106         if (sourceName != null)

   107             source = Source.lookup(sourceName);

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

   109     }

   111     protected ClassLoader getClassLoader(URL[] urls) {

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

   114         // Bug: 6558476

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

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

   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         }

   131         // 2: If URLClassLoader implements Closeable, use that.

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

   133             return new URLClassLoader(urls, thisClassLoader);

   135         // 3: Try using private reflection-based CloseableURLClassLoader

   136         try {

   137             return new CloseableURLClassLoader(urls, thisClassLoader);

   138         } catch (Throwable t) {

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

   140         }

   142         // 4: If all else fails, use plain old standard URLClassLoader

   143         return new URLClassLoader(urls, thisClassLoader);

   144     }

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

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

   148         for (JavacOption o: javacFileManagerOptions) {

   149             if (o.matches(current))  {

   150                 if (o.hasArg()) {

   151                     if (remaining.hasNext()) {

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

   153                             return true;

   154                     }

   155                 } else {

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

   157                         return true;

   158                 }

   159                 // operand missing, or process returned false

   160                 throw new IllegalArgumentException(current);

   161             }

   162         }

   164         return false;

   165     }

   166     // where

   167         private static JavacOption[] javacFileManagerOptions =

   168             RecognizedOptions.getJavacFileManagerOptions(

   169             new RecognizedOptions.GrumpyHelper(Log.instance(new Context())));

   171     public int isSupportedOption(String option) {

   172         for (JavacOption o : javacFileManagerOptions) {

   173             if (o.matches(option))

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

   175         }

   176         return -1;

   177     }

   179     public abstract boolean isDefaultBootClassPath();

   181     // </editor-fold>

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

   184     private String defaultEncodingName;

   185     private String getDefaultEncodingName() {

   186         if (defaultEncodingName == null) {

   187             defaultEncodingName =

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

   189         }

   190         return defaultEncodingName;

   191     }

   193     public String getEncodingName() {

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

   195         if (encName == null)

   196             return getDefaultEncodingName();

   197         else

   198             return encName;

   199     }

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

   202         String encodingName = getEncodingName();

   203         CharsetDecoder decoder;

   204         try {

   205             decoder = getDecoder(encodingName, ignoreEncodingErrors);

   206         } catch (IllegalCharsetNameException e) {

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

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

   209         } catch (UnsupportedCharsetException e) {

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

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

   212         }

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

   215         float factor =

   216             decoder.averageCharsPerByte() * 0.8f +

   217             decoder.maxCharsPerByte() * 0.2f;

   218         CharBuffer dest = CharBuffer.

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

   221         while (true) {

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

   223             dest.flip();

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

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

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

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

   229                     dest.flip();

   230                 }

   231                 return dest;

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

   233                 int newCapacity =

   234                     10 + dest.capacity() +

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

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

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

   238                 // bad character in input

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

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

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

   243                               "illegal.char.for.encoding",

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

   245                 } else {

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

   247                                 "illegal.char.for.encoding",

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

   249                 }

   251                 // skip past the coding error

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

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

   255                 // for more translation

   256                 dest.position(dest.limit());

   257                 dest.limit(dest.capacity());

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

   259             } else {

   260                 throw new AssertionError(result);

   261             }

   262         }

   263         // unreached

   264     }

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

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

   268             ? Charset.forName(encodingName)

   269             : this.charset;

   270         CharsetDecoder decoder = cs.newDecoder();

   272         CodingErrorAction action;

   273         if (ignoreEncodingErrors)

   274             action = CodingErrorAction.REPLACE;

   275         else

   276             action = CodingErrorAction.REPORT;

   278         return decoder

   279             .onMalformedInput(action)

   280             .onUnmappableCharacter(action);

   281     }

   282     // </editor-fold>

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

   285     /**

   286      * Make a byte buffer from an input stream.

   287      */

   288     public ByteBuffer makeByteBuffer(InputStream in)

   289         throws IOException {

   290         int limit = in.available();

   291         if (limit < 1024) limit = 1024;

   292         ByteBuffer result = byteBufferCache.get(limit);

   293         int position = 0;

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

   295             if (position >= limit)

   296                 // expand buffer

   297                 result = ByteBuffer.

   298                     allocate(limit <<= 1).

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

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

   301                 position,

   302                 limit - position);

   303             if (count < 0) break;

   304             result.position(position += count);

   305         }

   306         return (ByteBuffer)result.flip();

   307     }

   309     public void recycleByteBuffer(ByteBuffer bb) {

   310         byteBufferCache.put(bb);

   311     }

   313     /**

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

   315      */

   316     private static class ByteBufferCache {

   317         private ByteBuffer cached;

   318         ByteBuffer get(int capacity) {

   319             if (capacity < 20480) capacity = 20480;

   320             ByteBuffer result =

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

   322                 ? (ByteBuffer)cached.clear()

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

   324             cached = null;

   325             return result;

   326         }

   327         void put(ByteBuffer x) {

   328             cached = x;

   329         }

   330     }

   332     private final ByteBufferCache byteBufferCache;

   333     // </editor-fold>

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

   336     public CharBuffer getCachedContent(JavaFileObject file) {

   337         ContentCacheEntry e = contentCache.get(file);

   338         if (e == null)

   339             return null;

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

   342             contentCache.remove(file);

   343             return null;

   344         }

   346         return e.getValue();

   347     }

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

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

   351     }

   353     public void flushCache(JavaFileObject file) {

   354         contentCache.remove(file);

   355     }

   357     protected final Map<JavaFileObject, ContentCacheEntry> contentCache

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

   360     protected static class ContentCacheEntry {

   361         final long timestamp;

   362         final SoftReference<CharBuffer> ref;

   364         ContentCacheEntry(JavaFileObject file, CharBuffer cb) {

   365             this.timestamp = file.getLastModified();

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

   367         }

   369         boolean isValid(JavaFileObject file) {

   370             return timestamp == file.getLastModified();

   371         }

   373         CharBuffer getValue() {

   374             return ref.get();

   375         }

   376     }

   377     // </editor-fold>

   379     public static Kind getKind(String name) {

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

   381             return Kind.CLASS;

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

   383             return Kind.SOURCE;

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

   385             return Kind.HTML;

   386         else

   387             return Kind.OTHER;

   388     }

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

   391         o.getClass(); // null check

   392         return o;

   393     }

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

   396         for (T t : it)

   397             t.getClass(); // null check

   398         return it;

   399     }

   400 }

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

src/share/classes/com/sun/tools/javac/util/BaseFileManager.java@7375d4979bd3

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