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

 /*

  * Copyright (c) 2009, 2010, 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

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  */

 package com.sun.xml.internal.ws.util;

 import com.sun.istack.internal.NotNull;

 import com.sun.istack.internal.Nullable;

 import java.io.File;

 import java.io.FileInputStream;

 import java.io.FileOutputStream;

 import java.io.IOException;

 import java.io.InputStream;

 /**

  * Reads a input stream completely and creates a new stream

  * by keeping some data in memory and the rest on the file system.

  *

  * @author Jitendra Kotamraju

  */

 public class ReadAllStream extends InputStream {

     private final @NotNull MemoryStream memStream;

     private final @NotNull FileStream fileStream;

     private boolean readAll;

     private boolean closed;

     public ReadAllStream() {

         memStream = new MemoryStream();

         fileStream = new FileStream();

     }

     /**

      * Reads the data from input stream completely. It keeps

      * inMemory size in the memory, and the rest on the file

      * system.

      *

      * Caller's responsibility to close the InputStream. This

      * method can be called only once.

      *

      * @param in from which to be read

      * @param inMemory this much data is kept in the memory

      * @throws IOException in case of exception

      */

     public void readAll(InputStream in, long inMemory) throws IOException {

         assert !readAll;

         readAll = true;

         boolean eof = memStream.readAll(in, inMemory);

         if (!eof) {

             fileStream.readAll(in);

         }

     }

     public int read() throws IOException {

         int ch = memStream.read();

         if (ch == -1) {

             ch = fileStream.read();

         }

         return ch;

     }

     @Override

     public int read(byte b[], int off, int sz) throws IOException {

         int len = memStream.read(b, off, sz);

         if (len == -1) {

             len = fileStream.read(b, off, sz);

         }

         return len;

     }

     public void close() throws IOException {

         if (!closed) {

             memStream.close();

             fileStream.close();

             closed = true;

         }

     }

     // Keeps the rest of the data on the file system

     private static class FileStream extends InputStream {

         private @Nullable File tempFile;

         private @Nullable FileInputStream fin;

         void readAll(InputStream in) throws IOException {

             tempFile = File.createTempFile("jaxws",".bin");

             FileOutputStream fileOut = new FileOutputStream(tempFile);

             try {

                 byte[] buf = new byte[8192];

                 int len;

                 while((len=in.read(buf)) != -1) {

                     fileOut.write(buf, 0, len);

                 }

             } finally {

                 fileOut.close();

             }

             fin = new FileInputStream(tempFile);

         }

         public int read() throws IOException {

             return (fin != null) ? fin.read() : -1;

         }

         @Override

         public int read(byte b[], int off, int sz) throws IOException {

             return (fin != null) ? fin.read(b, off, sz) : -1;

         }

         @Override

         public void close() throws IOException {

             if (fin != null) {

                 fin.close();

             }

             if (tempFile != null) {

                 tempFile.delete();

             }

         }

     }

     // Keeps data in memory until certain size

     private static class MemoryStream extends InputStream {

         private Chunk head, tail;

         private int curOff;

         private void add(byte[] buf, int len) {

             if (tail != null) {

                 tail = tail.createNext(buf, 0, len);

             } else {

                 head = tail = new Chunk(buf, 0, len);

             }

         }

         /**

          * Reads until the size specified

          *

          * @param in stream from which to be read

          * @param inMemory reads until this size

          * @return true if eof

          *         false otherwise

          * @throws IOException in case of exception

          */

         boolean readAll(InputStream in, long inMemory) throws IOException {

             long total = 0;

             while(true) {

                 byte[] buf = new byte[8192];

                 int read = fill(in, buf);

                 total += read;

                 if (read != 0)

                     add(buf, read);

                 if (read != buf.length)

                     return true;        // EOF

                 if (total > inMemory)

                     return false;       // Reached in-memory size

             }

         }

         private int fill(InputStream in, byte[] buf) throws IOException {

             int read;

             int total = 0;

             while(total < buf.length && (read=in.read(buf, total, buf.length-total)) != -1) {

                 total += read;

             }

             return total;

         }

         public int read() throws IOException {

             if (!fetch()) {

                 return -1;

             }

             return (head.buf[curOff++] & 0xff);

         }

         @Override

         public int read(byte b[], int off, int sz) throws IOException {

             if (!fetch()) {

                 return -1;

             }

             sz = Math.min(sz, head.len-(curOff-head.off));

             System.arraycopy(head.buf,curOff,b,off,sz);

             curOff += sz;

             return sz;

         }

         // if eof, return false else true

         private boolean fetch() {

             if (head == null) {

                 return false;

             }

             if (curOff == head.off+head.len) {

                 head = head.next;

                 if (head == null) {

                     return false;

                 }

                 curOff = head.off;

             }

             return true;

         }

         private static final class Chunk {

             Chunk next;

             final byte[] buf;

             final int off;

             final int len;

             public Chunk(byte[] buf, int off, int len) {

                 this.buf = buf;

                 this.off = off;

                 this.len = len;

             }

             public Chunk createNext(byte[] buf, int off, int len) {

                 return next = new Chunk(buf, off, len);

             }

         }

     }

 }