254 lines
7.6 KiB
Java
254 lines
7.6 KiB
Java
/*
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* Copyright (c) 2009, 2012, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package com.sun.xml.internal.ws.util;
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import com.sun.istack.internal.NotNull;
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import com.sun.istack.internal.Nullable;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.util.logging.Level;
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import java.util.logging.Logger;
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/**
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* Reads a input stream completely and creates a new stream
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* by keeping some data in memory and the rest on the file system.
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*
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* @author Jitendra Kotamraju
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*/
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public class ReadAllStream extends InputStream {
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private final @NotNull MemoryStream memStream;
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private final @NotNull FileStream fileStream;
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private boolean readAll;
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private boolean closed;
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private static final Logger LOGGER = Logger.getLogger(ReadAllStream.class.getName());
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public ReadAllStream() {
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memStream = new MemoryStream();
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fileStream = new FileStream();
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}
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/**
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* Reads the data from input stream completely. It keeps
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* inMemory size in the memory, and the rest on the file
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* system.
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*
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* Caller's responsibility to close the InputStream. This
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* method can be called only once.
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*
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* @param in from which to be read
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* @param inMemory this much data is kept in the memory
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* @throws IOException in case of exception
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*/
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public void readAll(InputStream in, long inMemory) throws IOException {
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assert !readAll;
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readAll = true;
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boolean eof = memStream.readAll(in, inMemory);
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if (!eof) {
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fileStream.readAll(in);
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}
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}
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@Override
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public int read() throws IOException {
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int ch = memStream.read();
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if (ch == -1) {
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ch = fileStream.read();
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}
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return ch;
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}
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@Override
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public int read(byte b[], int off, int sz) throws IOException {
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int len = memStream.read(b, off, sz);
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if (len == -1) {
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len = fileStream.read(b, off, sz);
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}
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return len;
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}
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@Override
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public void close() throws IOException {
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if (!closed) {
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memStream.close();
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fileStream.close();
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closed = true;
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}
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}
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// Keeps the rest of the data on the file system
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private static class FileStream extends InputStream {
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private @Nullable File tempFile;
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private @Nullable FileInputStream fin;
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void readAll(InputStream in) throws IOException {
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tempFile = File.createTempFile("jaxws",".bin");
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FileOutputStream fileOut = new FileOutputStream(tempFile);
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try {
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byte[] buf = new byte[8192];
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int len;
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while((len=in.read(buf)) != -1) {
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fileOut.write(buf, 0, len);
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}
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} finally {
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fileOut.close();
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}
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fin = new FileInputStream(tempFile);
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}
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@Override
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public int read() throws IOException {
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return (fin != null) ? fin.read() : -1;
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}
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@Override
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public int read(byte b[], int off, int sz) throws IOException {
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return (fin != null) ? fin.read(b, off, sz) : -1;
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}
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@Override
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public void close() throws IOException {
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if (fin != null) {
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fin.close();
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}
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if (tempFile != null) {
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boolean success = tempFile.delete();
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if (!success) {
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LOGGER.log(Level.INFO, "File {0} could not be deleted", tempFile);
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}
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}
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}
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}
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// Keeps data in memory until certain size
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private static class MemoryStream extends InputStream {
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private Chunk head, tail;
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private int curOff;
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private void add(byte[] buf, int len) {
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if (tail != null) {
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tail = tail.createNext(buf, 0, len);
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} else {
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head = tail = new Chunk(buf, 0, len);
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}
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}
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/**
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* Reads until the size specified
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*
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* @param in stream from which to be read
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* @param inMemory reads until this size
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* @return true if eof
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* false otherwise
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* @throws IOException in case of exception
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*/
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boolean readAll(InputStream in, long inMemory) throws IOException {
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long total = 0;
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while(true) {
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byte[] buf = new byte[8192];
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int read = fill(in, buf);
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total += read;
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if (read != 0) {
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add(buf, read);
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}
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if (read != buf.length) {
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return true;
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} // EOF
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if (total > inMemory) {
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return false; // Reached in-memory size
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}
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}
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}
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private int fill(InputStream in, byte[] buf) throws IOException {
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int read;
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int total = 0;
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while(total < buf.length && (read=in.read(buf, total, buf.length-total)) != -1) {
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total += read;
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}
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return total;
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}
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@Override
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public int read() throws IOException {
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if (!fetch()) {
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return -1;
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}
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return (head.buf[curOff++] & 0xff);
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}
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@Override
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public int read(byte b[], int off, int sz) throws IOException {
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if (!fetch()) {
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return -1;
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}
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sz = Math.min(sz, head.len-(curOff-head.off));
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System.arraycopy(head.buf,curOff,b,off,sz);
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curOff += sz;
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return sz;
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}
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// if eof, return false else true
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private boolean fetch() {
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if (head == null) {
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return false;
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}
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if (curOff == head.off+head.len) {
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head = head.next;
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if (head == null) {
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return false;
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}
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curOff = head.off;
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}
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return true;
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}
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private static final class Chunk {
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Chunk next;
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final byte[] buf;
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final int off;
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final int len;
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public Chunk(byte[] buf, int off, int len) {
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this.buf = buf;
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this.off = off;
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this.len = len;
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}
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public Chunk createNext(byte[] buf, int off, int len) {
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return next = new Chunk(buf, off, len);
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}
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}
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}
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}
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