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

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

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

Mon, 14 Nov 2011 15:11:10 -0800

author: ksrini
date: Mon, 14 Nov 2011 15:11:10 -0800
changeset 1138: 7375d4979bd3
parent 1136: ae361e7f435a
child 1157: 3809292620c9
permissions: -rw-r--r--

7106166: (javac) re-factor EndPos parser
Reviewed-by: jjg

 /*
  * Copyright (c) 2009, 2011, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.  Oracle designates this
  * particular file as subject to the "Classpath" exception as provided
  * by Oracle in the LICENSE file that accompanied this code.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  */
 package com.sun.tools.javac.util;
 import java.io.ByteArrayOutputStream;
 import java.io.Closeable;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStreamWriter;
 import java.lang.ref.SoftReference;
 import java.lang.reflect.Constructor;
 import java.net.URL;
 import java.net.URLClassLoader;
 import java.nio.ByteBuffer;
 import java.nio.CharBuffer;
 import java.nio.charset.Charset;
 import java.nio.charset.CharsetDecoder;
 import java.nio.charset.CoderResult;
 import java.nio.charset.CodingErrorAction;
 import java.nio.charset.IllegalCharsetNameException;
 import java.nio.charset.UnsupportedCharsetException;
 import java.util.Collection;
 import java.util.HashMap;
 import java.util.Iterator;
 import java.util.Map;
 import javax.tools.JavaFileObject;
 import javax.tools.JavaFileObject.Kind;
 import com.sun.tools.javac.code.Lint;
 import com.sun.tools.javac.code.Source;
 import com.sun.tools.javac.file.FSInfo;
 import com.sun.tools.javac.file.Locations;
 import com.sun.tools.javac.main.JavacOption;
 import com.sun.tools.javac.main.OptionName;
 import com.sun.tools.javac.main.RecognizedOptions;
 import com.sun.tools.javac.util.JCDiagnostic.SimpleDiagnosticPosition;
 /**
  * Utility methods for building a filemanager.
  * There are no references here to file-system specific objects such as
  * java.io.File or java.nio.file.Path.
  */
 public abstract class BaseFileManager {
     protected BaseFileManager(Charset charset) {
         this.charset = charset;
         byteBufferCache = new ByteBufferCache();
         locations = createLocations();
     }
     /**
      * Set the context for JavacPathFileManager.
      */
     public void setContext(Context context) {
         log = Log.instance(context);
         options = Options.instance(context);
         classLoaderClass = options.get("procloader");
         locations.update(log, options, Lint.instance(context), FSInfo.instance(context));
     }
     protected Locations createLocations() {
         return new Locations();
     }
     /**
      * The log to be used for error reporting.
      */
     public Log log;
     /**
      * User provided charset (through javax.tools).
      */
     protected Charset charset;
     protected Options options;
     protected String classLoaderClass;
     protected Locations locations;
     protected Source getSource() {
         String sourceName = options.get(OptionName.SOURCE);
         Source source = null;
         if (sourceName != null)
             source = Source.lookup(sourceName);
         return (source != null ? source : Source.DEFAULT);
     }
     protected ClassLoader getClassLoader(URL[] urls) {
         ClassLoader thisClassLoader = getClass().getClassLoader();
         // Bug: 6558476
         // Ideally, ClassLoader should be Closeable, but before JDK7 it is not.
         // On older versions, try the following, to get a closeable classloader.
         // 1: Allow client to specify the class to use via hidden option
         if (classLoaderClass != null) {
             try {
                 Class<? extends ClassLoader> loader =
                         Class.forName(classLoaderClass).asSubclass(ClassLoader.class);
                 Class<?>[] constrArgTypes = { URL[].class, ClassLoader.class };
                 Constructor<? extends ClassLoader> constr = loader.getConstructor(constrArgTypes);
                 return constr.newInstance(new Object[] { urls, thisClassLoader });
             } catch (Throwable t) {
                 // ignore errors loading user-provided class loader, fall through
             }
         }
         // 2: If URLClassLoader implements Closeable, use that.
         if (Closeable.class.isAssignableFrom(URLClassLoader.class))
             return new URLClassLoader(urls, thisClassLoader);
         // 3: Try using private reflection-based CloseableURLClassLoader
         try {
             return new CloseableURLClassLoader(urls, thisClassLoader);
         } catch (Throwable t) {
             // ignore errors loading workaround class loader, fall through
         }
         // 4: If all else fails, use plain old standard URLClassLoader
         return new URLClassLoader(urls, thisClassLoader);
     }
     // <editor-fold defaultstate="collapsed" desc="Option handling">
     public boolean handleOption(String current, Iterator<String> remaining) {
         for (JavacOption o: javacFileManagerOptions) {
             if (o.matches(current))  {
                 if (o.hasArg()) {
                     if (remaining.hasNext()) {
                         if (!o.process(options, current, remaining.next()))
                             return true;
                     }
                 } else {
                     if (!o.process(options, current))
                         return true;
                 }
                 // operand missing, or process returned false
                 throw new IllegalArgumentException(current);
             }
         }
         return false;
     }
     // where
         private static JavacOption[] javacFileManagerOptions =
             RecognizedOptions.getJavacFileManagerOptions(
             new RecognizedOptions.GrumpyHelper(Log.instance(new Context())));
     public int isSupportedOption(String option) {
         for (JavacOption o : javacFileManagerOptions) {
             if (o.matches(option))
                 return o.hasArg() ? 1 : 0;
         }
         return -1;
     }
     public abstract boolean isDefaultBootClassPath();
     // </editor-fold>
     // <editor-fold defaultstate="collapsed" desc="Encoding">
     private String defaultEncodingName;
     private String getDefaultEncodingName() {
         if (defaultEncodingName == null) {
             defaultEncodingName =
                 new OutputStreamWriter(new ByteArrayOutputStream()).getEncoding();
         }
         return defaultEncodingName;
     }
     public String getEncodingName() {
         String encName = options.get(OptionName.ENCODING);
         if (encName == null)
             return getDefaultEncodingName();
         else
             return encName;
     }
     public CharBuffer decode(ByteBuffer inbuf, boolean ignoreEncodingErrors) {
         String encodingName = getEncodingName();
         CharsetDecoder decoder;
         try {
             decoder = getDecoder(encodingName, ignoreEncodingErrors);
         } catch (IllegalCharsetNameException e) {
             log.error("unsupported.encoding", encodingName);
             return (CharBuffer)CharBuffer.allocate(1).flip();
         } catch (UnsupportedCharsetException e) {
             log.error("unsupported.encoding", encodingName);
             return (CharBuffer)CharBuffer.allocate(1).flip();
         }
         // slightly overestimate the buffer size to avoid reallocation.
         float factor =
             decoder.averageCharsPerByte() * 0.8f +
             decoder.maxCharsPerByte() * 0.2f;
         CharBuffer dest = CharBuffer.
             allocate(10 + (int)(inbuf.remaining()*factor));
         while (true) {
             CoderResult result = decoder.decode(inbuf, dest, true);
             dest.flip();
             if (result.isUnderflow()) { // done reading
                 // make sure there is at least one extra character
                 if (dest.limit() == dest.capacity()) {
                     dest = CharBuffer.allocate(dest.capacity()+1).put(dest);
                     dest.flip();
                 }
                 return dest;
             } else if (result.isOverflow()) { // buffer too small; expand
                 int newCapacity =
 + dest.capacity() +
                     (int)(inbuf.remaining()*decoder.maxCharsPerByte());
                 dest = CharBuffer.allocate(newCapacity).put(dest);
             } else if (result.isMalformed() || result.isUnmappable()) {
                 // bad character in input
                 // report coding error (warn only pre 1.5)
                 if (!getSource().allowEncodingErrors()) {
                     log.error(new SimpleDiagnosticPosition(dest.limit()),
                               "illegal.char.for.encoding",
                               charset == null ? encodingName : charset.name());
                 } else {
                     log.warning(new SimpleDiagnosticPosition(dest.limit()),
                                 "illegal.char.for.encoding",
                                 charset == null ? encodingName : charset.name());
                 }
                 // skip past the coding error
                 inbuf.position(inbuf.position() + result.length());
                 // undo the flip() to prepare the output buffer
                 // for more translation
                 dest.position(dest.limit());
                 dest.limit(dest.capacity());
                 dest.put((char)0xfffd); // backward compatible
             } else {
                 throw new AssertionError(result);
             }
         }
         // unreached
     }
     public CharsetDecoder getDecoder(String encodingName, boolean ignoreEncodingErrors) {
         Charset cs = (this.charset == null)
             ? Charset.forName(encodingName)
             : this.charset;
         CharsetDecoder decoder = cs.newDecoder();
         CodingErrorAction action;
         if (ignoreEncodingErrors)
             action = CodingErrorAction.REPLACE;
         else
             action = CodingErrorAction.REPORT;
         return decoder
             .onMalformedInput(action)
             .onUnmappableCharacter(action);
     }
     // </editor-fold>
     // <editor-fold defaultstate="collapsed" desc="ByteBuffers">
     /**
      * Make a byte buffer from an input stream.
      */
     public ByteBuffer makeByteBuffer(InputStream in)
         throws IOException {
         int limit = in.available();
         if (limit < 1024) limit = 1024;
         ByteBuffer result = byteBufferCache.get(limit);
         int position = 0;
         while (in.available() != 0) {
             if (position >= limit)
                 // expand buffer
                 result = ByteBuffer.
                     allocate(limit <<= 1).
                     put((ByteBuffer)result.flip());
             int count = in.read(result.array(),
                 position,
                 limit - position);
             if (count < 0) break;
             result.position(position += count);
         }
         return (ByteBuffer)result.flip();
     }
     public void recycleByteBuffer(ByteBuffer bb) {
         byteBufferCache.put(bb);
     }
     /**
      * A single-element cache of direct byte buffers.
      */
     private static class ByteBufferCache {
         private ByteBuffer cached;
         ByteBuffer get(int capacity) {
             if (capacity < 20480) capacity = 20480;
             ByteBuffer result =
                 (cached != null && cached.capacity() >= capacity)
                 ? (ByteBuffer)cached.clear()
                 : ByteBuffer.allocate(capacity + capacity>>1);
             cached = null;
             return result;
         }
         void put(ByteBuffer x) {
             cached = x;
         }
     }
     private final ByteBufferCache byteBufferCache;
     // </editor-fold>
     // <editor-fold defaultstate="collapsed" desc="Content cache">
     public CharBuffer getCachedContent(JavaFileObject file) {
         ContentCacheEntry e = contentCache.get(file);
         if (e == null)
             return null;
         if (!e.isValid(file)) {
             contentCache.remove(file);
             return null;
         }
         return e.getValue();
     }
     public void cache(JavaFileObject file, CharBuffer cb) {
         contentCache.put(file, new ContentCacheEntry(file, cb));
     }
     public void flushCache(JavaFileObject file) {
         contentCache.remove(file);
     }
     protected final Map<JavaFileObject, ContentCacheEntry> contentCache
             = new HashMap<JavaFileObject, ContentCacheEntry>();
     protected static class ContentCacheEntry {
         final long timestamp;
         final SoftReference<CharBuffer> ref;
         ContentCacheEntry(JavaFileObject file, CharBuffer cb) {
             this.timestamp = file.getLastModified();
             this.ref = new SoftReference<CharBuffer>(cb);
         }
         boolean isValid(JavaFileObject file) {
             return timestamp == file.getLastModified();
         }
         CharBuffer getValue() {
             return ref.get();
         }
     }
     // </editor-fold>
     public static Kind getKind(String name) {
         if (name.endsWith(Kind.CLASS.extension))
             return Kind.CLASS;
         else if (name.endsWith(Kind.SOURCE.extension))
             return Kind.SOURCE;
         else if (name.endsWith(Kind.HTML.extension))
             return Kind.HTML;
         else
             return Kind.OTHER;
     }
     protected static <T> T nullCheck(T o) {
         o.getClass(); // null check
         return o;
     }
     protected static <T> Collection<T> nullCheck(Collection<T> it) {
         for (T t : it)
             t.getClass(); // null check
         return it;
     }
 }

Mercurial > jdk8-mips64-public > langtools / annotate

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

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