jdk8-mips64-public/langtools: src/share/classes/com/sun/tools/javac/util/BaseFileManager.java@c44234f680da

6900037: javac should warn if earlier -source is used and bootclasspath not set
Reviewed-by: darcy

     1 /*

     2  * Copyright (c) 2009, 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 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 abstract 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     }

   167     public abstract boolean isDefaultBootClassPath();

   169     // </editor-fold>

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

   172     private String defaultEncodingName;

   173     private String getDefaultEncodingName() {

   174         if (defaultEncodingName == null) {

   175             defaultEncodingName =

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

   177         }

   178         return defaultEncodingName;

   179     }

   181     public String getEncodingName() {

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

   183         if (encName == null)

   184             return getDefaultEncodingName();

   185         else

   186             return encName;

   187     }

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

   190         String encodingName = getEncodingName();

   191         CharsetDecoder decoder;

   192         try {

   193             decoder = getDecoder(encodingName, ignoreEncodingErrors);

   194         } catch (IllegalCharsetNameException e) {

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

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

   197         } catch (UnsupportedCharsetException e) {

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

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

   200         }

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

   203         float factor =

   204             decoder.averageCharsPerByte() * 0.8f +

   205             decoder.maxCharsPerByte() * 0.2f;

   206         CharBuffer dest = CharBuffer.

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

   209         while (true) {

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

   211             dest.flip();

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

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

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

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

   217                     dest.flip();

   218                 }

   219                 return dest;

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

   221                 int newCapacity =

   222                     10 + dest.capacity() +

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

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

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

   226                 // bad character in input

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

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

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

   231                               "illegal.char.for.encoding",

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

   233                 } else {

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

   235                                 "illegal.char.for.encoding",

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

   237                 }

   239                 // skip past the coding error

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

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

   243                 // for more translation

   244                 dest.position(dest.limit());

   245                 dest.limit(dest.capacity());

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

   247             } else {

   248                 throw new AssertionError(result);

   249             }

   250         }

   251         // unreached

   252     }

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

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

   256             ? Charset.forName(encodingName)

   257             : this.charset;

   258         CharsetDecoder decoder = cs.newDecoder();

   260         CodingErrorAction action;

   261         if (ignoreEncodingErrors)

   262             action = CodingErrorAction.REPLACE;

   263         else

   264             action = CodingErrorAction.REPORT;

   266         return decoder

   267             .onMalformedInput(action)

   268             .onUnmappableCharacter(action);

   269     }

   270     // </editor-fold>

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

   273     /**

   274      * Make a byte buffer from an input stream.

   275      */

   276     public ByteBuffer makeByteBuffer(InputStream in)

   277         throws IOException {

   278         int limit = in.available();

   279         if (limit < 1024) limit = 1024;

   280         ByteBuffer result = byteBufferCache.get(limit);

   281         int position = 0;

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

   283             if (position >= limit)

   284                 // expand buffer

   285                 result = ByteBuffer.

   286                     allocate(limit <<= 1).

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

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

   289                 position,

   290                 limit - position);

   291             if (count < 0) break;

   292             result.position(position += count);

   293         }

   294         return (ByteBuffer)result.flip();

   295     }

   297     public void recycleByteBuffer(ByteBuffer bb) {

   298         byteBufferCache.put(bb);

   299     }

   301     /**

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

   303      */

   304     private static class ByteBufferCache {

   305         private ByteBuffer cached;

   306         ByteBuffer get(int capacity) {

   307             if (capacity < 20480) capacity = 20480;

   308             ByteBuffer result =

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

   310                 ? (ByteBuffer)cached.clear()

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

   312             cached = null;

   313             return result;

   314         }

   315         void put(ByteBuffer x) {

   316             cached = x;

   317         }

   318     }

   320     private final ByteBufferCache byteBufferCache;

   321     // </editor-fold>

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

   324     public CharBuffer getCachedContent(JavaFileObject file) {

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

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

   327     }

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

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

   331     }

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

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

   335     // </editor-fold>

   337     public static Kind getKind(String name) {

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

   339             return Kind.CLASS;

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

   341             return Kind.SOURCE;

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

   343             return Kind.HTML;

   344         else

   345             return Kind.OTHER;

   346     }

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

   349         o.getClass(); // null check

   350         return o;

   351     }

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

   354         for (T t : it)

   355             t.getClass(); // null check

   356         return it;

   357     }

   358 }

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

src/share/classes/com/sun/tools/javac/util/BaseFileManager.java@c44234f680da

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