jdk8-mips64-public/jaxws: src/share/jaxws_classes/com/sun/xml/internal/org/jvnet/mimepull/DataHead.java@9c07ef4934dd (annotated)

src/share/jaxws_classes/com/sun/xml/internal/org/jvnet/mimepull/DataHead.java@9c07ef4934dd (annotated)

src/share/jaxws_classes/com/sun/xml/internal/org/jvnet/mimepull/DataHead.java

Thu, 31 Aug 2017 15:18:52 +0800

author: aoqi
date: Thu, 31 Aug 2017 15:18:52 +0800
changeset 637: 9c07ef4934dd
parent 384: 8f2986ff0235
parent 0: 373ffda63c9a
permissions: -rw-r--r--

merge

 /*
  * Copyright (c) 1997, 2013, 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.xml.internal.org.jvnet.mimepull;
 import java.io.*;
 import java.nio.ByteBuffer;
 /**
  * Represents an attachment part in a MIME message. MIME message parsing is done
  * lazily using a pull parser, so the part may not have all the data. {@link #read}
  * and {@link #readOnce} may trigger the actual parsing the message. In fact,
  * parsing of an attachment part may be triggered by calling {@link #read} methods
  * on some other attachment parts. All this happens behind the scenes so the
  * application developer need not worry about these details.
  *
  * @author Jitendra Kotamraju
  */
 final class DataHead {
     /**
      * Linked list to keep the part's content
      */
     volatile Chunk head, tail;
     /**
      * If the part is stored in a file, non-null.
      */
     DataFile dataFile;
     private final MIMEPart part;
     boolean readOnce;
     volatile long inMemory;
     /**
      * Used only for debugging. This records where readOnce() is called.
      */
     private Throwable consumedAt;
     DataHead(MIMEPart part) {
         this.part = part;
     }
     void addBody(ByteBuffer buf) {
         synchronized(this) {
             inMemory += buf.limit();
         }
         if (tail != null) {
             tail = tail.createNext(this, buf);
         } else {
             head = tail = new Chunk(new MemoryData(buf, part.msg.config));
         }
     }
     void doneParsing() {
     }
     void moveTo(File f) {
         if (dataFile != null) {
             dataFile.renameTo(f);
         } else {
             try {
                 OutputStream os = new FileOutputStream(f);
                 try {
                     InputStream in = readOnce();
                     byte[] buf = new byte[8192];
                     int len;
                     while((len=in.read(buf)) != -1) {
                         os.write(buf, 0, len);
                     }
                 } finally {
                     if (os != null) {
                         os.close();
                     }
                 }
             } catch(IOException ioe) {
                 throw new MIMEParsingException(ioe);
             }
         }
     }
     void close() {
         head = tail = null;
         if (dataFile != null) {
             dataFile.close();
         }
     }
     /**
      * Can get the attachment part's content multiple times. That means
      * the full content needs to be there in memory or on the file system.
      * Calling this method would trigger parsing for the part's data. So
      * do not call this unless it is required(otherwise, just wrap MIMEPart
      * into a object that returns InputStream for e.g DataHandler)
      *
      * @return data for the part's content
      */
     public InputStream read() {
         if (readOnce) {
             throw new IllegalStateException("readOnce() is called before, read() cannot be called later.");
         }
         // Trigger parsing for the part
         while(tail == null) {
             if (!part.msg.makeProgress()) {
                 throw new IllegalStateException("No such MIME Part: "+part);
             }
         }
         if (head == null) {
             throw new IllegalStateException("Already read. Probably readOnce() is called before.");
         }
         return new ReadMultiStream();
     }
     /**
      * Used for an assertion. Returns true when readOnce() is not already called.
      * or otherwise throw an exception.
      *
      * <p>
      * Calling this method also marks the stream as 'consumed'
      *
      * @return true if readOnce() is not called before
      */
     @SuppressWarnings("ThrowableInitCause")
     private boolean unconsumed() {
         if (consumedAt != null) {
             AssertionError error = new AssertionError("readOnce() is already called before. See the nested exception from where it's called.");
             error.initCause(consumedAt);
             throw error;
         }
         consumedAt = new Exception().fillInStackTrace();
         return true;
     }
     /**
      * Can get the attachment part's content only once. The content
      * will be lost after the method. Content data is not be stored
      * on the file system or is not kept in the memory for the
      * following case:
      *   - Attachement parts contents are accessed sequentially
      *
      * In general, take advantage of this when the data is used only
      * once.
      *
      * @return data for the part's content
      */
     public InputStream readOnce() {
         assert unconsumed();
         if (readOnce) {
             throw new IllegalStateException("readOnce() is called before. It can only be called once.");
         }
         readOnce = true;
         // Trigger parsing for the part
         while(tail == null) {
             if (!part.msg.makeProgress() && tail == null) {
                 throw new IllegalStateException("No such Part: "+part);
             }
         }
         InputStream in = new ReadOnceStream();
         head = null;
         return in;
     }
     class ReadMultiStream extends InputStream {
         Chunk current;
         int offset;
         int len;
         byte[] buf;
         boolean closed;
         public ReadMultiStream() {
             this.current = head;
             len = current.data.size();
             buf = current.data.read();
         }
         @Override
         public int read(byte b[], int off, int sz) throws IOException {
             if (!fetch()) {
                 return -1;
             }
             sz = Math.min(sz, len-offset);
             System.arraycopy(buf,offset,b,off,sz);
             offset += sz;
             return sz;
         }
         @Override
         public int read() throws IOException {
             if (!fetch()) {
                 return -1;
             }
             return (buf[offset++] & 0xff);
         }
         void adjustInMemoryUsage() {
             // Nothing to do in this case.
         }
         /**
          * Gets to the next chunk if we are done with the current one.
          * @return true if any data available
          * @throws IOException when i/o error
          */
         private boolean fetch() throws IOException {
             if (closed) {
                 throw new IOException("Stream already closed");
             }
             if (current == null) {
                 return false;
             }
             while(offset==len) {
                 while(!part.parsed && current.next == null) {
                     part.msg.makeProgress();
                 }
                 current = current.next;
                 if (current == null) {
                     return false;
                 }
                 adjustInMemoryUsage();
                 this.offset = 0;
                 this.buf = current.data.read();
                 this.len = current.data.size();
             }
             return true;
         }
         @Override
         public void close() throws IOException {
             super.close();
             current = null;
             closed = true;
         }
     }
     final class ReadOnceStream extends ReadMultiStream {
         @Override
         void adjustInMemoryUsage() {
             synchronized(DataHead.this) {
                 inMemory -= current.data.size();    // adjust current memory usage
             }
         }
     }
 }

Mercurial > jdk8-mips64-public > jaxws / annotate

src/share/jaxws_classes/com/sun/xml/internal/org/jvnet/mimepull/DataHead.java@9c07ef4934dd (annotated)

src/share/jaxws_classes/com/sun/xml/internal/org/jvnet/mimepull/DataHead.java