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126 lines
3.9 KiB
Java
126 lines
3.9 KiB
Java
/*
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* Copyright (c) 2005, 2007, 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 sun.net.httpserver;
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import java.io.*;
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import com.sun.net.httpserver.*;
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import com.sun.net.httpserver.spi.*;
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/**
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* a (filter) input stream which can tell us if bytes are "left over"
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* on the underlying stream which can be read (without blocking)
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* on another instance of this class.
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*
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* The class can also report if all bytes "expected" to be read
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* were read, by the time close() was called. In that case,
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* bytes may be drained to consume them (by calling drain() ).
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*
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* isEOF() returns true, when all expected bytes have been read
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*/
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abstract class LeftOverInputStream extends FilterInputStream {
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final ExchangeImpl t;
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final ServerImpl server;
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protected boolean closed = false;
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protected boolean eof = false;
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byte[] one = new byte [1];
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public LeftOverInputStream (ExchangeImpl t, InputStream src) {
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super (src);
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this.t = t;
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this.server = t.getServerImpl();
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}
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/**
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* if bytes are left over buffered on *the UNDERLYING* stream
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*/
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public boolean isDataBuffered () throws IOException {
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assert eof;
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return super.available() > 0;
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}
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public void close () throws IOException {
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if (closed) {
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return;
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}
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closed = true;
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if (!eof) {
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eof = drain (ServerConfig.getDrainAmount());
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}
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}
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public boolean isClosed () {
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return closed;
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}
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public boolean isEOF () {
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return eof;
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}
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protected abstract int readImpl (byte[]b, int off, int len) throws IOException;
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public synchronized int read () throws IOException {
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if (closed) {
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throw new IOException ("Stream is closed");
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}
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int c = readImpl (one, 0, 1);
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if (c == -1 || c == 0) {
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return c;
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} else {
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return one[0] & 0xFF;
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}
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}
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public synchronized int read (byte[]b, int off, int len) throws IOException {
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if (closed) {
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throw new IOException ("Stream is closed");
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}
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return readImpl (b, off, len);
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}
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/**
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* read and discard up to l bytes or "eof" occurs,
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* (whichever is first). Then return true if the stream
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* is at eof (ie. all bytes were read) or false if not
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* (still bytes to be read)
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*/
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public boolean drain (long l) throws IOException {
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int bufSize = 2048;
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byte[] db = new byte [bufSize];
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while (l > 0) {
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if (server.isFinishing()) {
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break;
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}
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long len = readImpl (db, 0, bufSize);
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if (len == -1) {
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eof = true;
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return true;
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} else {
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l = l - len;
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}
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}
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return false;
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}
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}
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