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/*
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* Copyright (c) 2016, 2017, 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 jdk.incubator.http;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.UncheckedIOException;
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import java.nio.ByteBuffer;
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import java.nio.charset.Charset;
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import java.nio.file.Path;
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import java.security.AccessControlContext;
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import java.security.AccessController;
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import java.security.PrivilegedAction;
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import java.security.PrivilegedActionException;
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import java.security.PrivilegedExceptionAction;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.Iterator;
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import java.util.List;
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import java.util.NoSuchElementException;
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import java.util.concurrent.ConcurrentLinkedQueue;
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import java.util.concurrent.Flow;
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import java.util.function.Supplier;
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import jdk.incubator.http.HttpRequest.BodyPublisher;
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import jdk.incubator.http.internal.common.Utils;
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class RequestPublishers {
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static class ByteArrayPublisher implements HttpRequest.BodyPublisher {
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private volatile Flow.Publisher<ByteBuffer> delegate;
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private final int length;
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private final byte[] content;
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private final int offset;
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private final int bufSize;
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ByteArrayPublisher(byte[] content) {
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this(content, 0, content.length);
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}
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ByteArrayPublisher(byte[] content, int offset, int length) {
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this(content, offset, length, Utils.BUFSIZE);
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}
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/* bufSize exposed for testing purposes */
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ByteArrayPublisher(byte[] content, int offset, int length, int bufSize) {
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this.content = content;
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this.offset = offset;
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this.length = length;
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this.bufSize = bufSize;
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}
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List<ByteBuffer> copy(byte[] content, int offset, int length) {
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List<ByteBuffer> bufs = new ArrayList<>();
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while (length > 0) {
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ByteBuffer b = ByteBuffer.allocate(Math.min(bufSize, length));
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int max = b.capacity();
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int tocopy = Math.min(max, length);
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b.put(content, offset, tocopy);
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offset += tocopy;
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length -= tocopy;
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b.flip();
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bufs.add(b);
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}
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return bufs;
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}
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@Override
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public void subscribe(Flow.Subscriber<? super ByteBuffer> subscriber) {
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List<ByteBuffer> copy = copy(content, offset, length);
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this.delegate = new PullPublisher<>(copy);
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delegate.subscribe(subscriber);
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}
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@Override
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public long contentLength() {
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return length;
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}
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}
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// This implementation has lots of room for improvement.
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static class IterablePublisher implements HttpRequest.BodyPublisher {
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private volatile Flow.Publisher<ByteBuffer> delegate;
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private final Iterable<byte[]> content;
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private volatile long contentLength;
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IterablePublisher(Iterable<byte[]> content) {
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this.content = content;
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}
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// The ByteBufferIterator will iterate over the byte[] arrays in
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// the content one at the time.
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//
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class ByteBufferIterator implements Iterator<ByteBuffer> {
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final ConcurrentLinkedQueue<ByteBuffer> buffers = new ConcurrentLinkedQueue<>();
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final Iterator<byte[]> iterator = content.iterator();
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@Override
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public boolean hasNext() {
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return !buffers.isEmpty() || iterator.hasNext();
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}
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@Override
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public ByteBuffer next() {
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ByteBuffer buffer = buffers.poll();
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while (buffer == null) {
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copy();
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buffer = buffers.poll();
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}
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return buffer;
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}
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ByteBuffer getBuffer() {
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return Utils.getBuffer();
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}
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void copy() {
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byte[] bytes = iterator.next();
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int length = bytes.length;
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if (length == 0 && iterator.hasNext()) {
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// avoid inserting empty buffers, except
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// if that's the last.
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return;
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}
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int offset = 0;
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do {
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ByteBuffer b = getBuffer();
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int max = b.capacity();
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int tocopy = Math.min(max, length);
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b.put(bytes, offset, tocopy);
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offset += tocopy;
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length -= tocopy;
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b.flip();
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buffers.add(b);
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} while (length > 0);
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}
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}
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public Iterator<ByteBuffer> iterator() {
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return new ByteBufferIterator();
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}
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@Override
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public void subscribe(Flow.Subscriber<? super ByteBuffer> subscriber) {
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Iterable<ByteBuffer> iterable = this::iterator;
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this.delegate = new PullPublisher<>(iterable);
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delegate.subscribe(subscriber);
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}
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static long computeLength(Iterable<byte[]> bytes) {
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long len = 0;
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for (byte[] b : bytes) {
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len = Math.addExact(len, (long)b.length);
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}
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return len;
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}
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@Override
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public long contentLength() {
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if (contentLength == 0) {
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synchronized(this) {
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if (contentLength == 0) {
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contentLength = computeLength(content);
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}
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}
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}
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return contentLength;
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}
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}
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static class StringPublisher extends ByteArrayPublisher {
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public StringPublisher(String content, Charset charset) {
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super(content.getBytes(charset));
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}
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}
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static class EmptyPublisher implements HttpRequest.BodyPublisher {
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private final Flow.Publisher<ByteBuffer> delegate =
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new PullPublisher<ByteBuffer>(Collections.emptyList(), null);
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@Override
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public long contentLength() {
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return 0;
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}
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@Override
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public void subscribe(Flow.Subscriber<? super ByteBuffer> subscriber) {
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delegate.subscribe(subscriber);
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}
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}
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static class FilePublisher implements BodyPublisher {
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private final File file;
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private volatile AccessControlContext acc;
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FilePublisher(Path name) {
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file = name.toFile();
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}
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void setAccessControlContext(AccessControlContext acc) {
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this.acc = acc;
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}
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@Override
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public void subscribe(Flow.Subscriber<? super ByteBuffer> subscriber) {
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if (System.getSecurityManager() != null && acc == null)
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throw new InternalError(
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"Unexpected null acc when security manager has been installed");
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InputStream is;
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try {
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PrivilegedExceptionAction<FileInputStream> pa =
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() -> new FileInputStream(file);
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is = AccessController.doPrivileged(pa, acc);
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} catch (PrivilegedActionException pae) {
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throw new UncheckedIOException((IOException)pae.getCause());
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}
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PullPublisher<ByteBuffer> publisher =
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new PullPublisher<>(() -> new StreamIterator(is));
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publisher.subscribe(subscriber);
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}
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@Override
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public long contentLength() {
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assert System.getSecurityManager() != null ? acc != null: true;
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PrivilegedAction<Long> pa = () -> file.length();
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return AccessController.doPrivileged(pa, acc);
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}
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}
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/**
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* Reads one buffer ahead all the time, blocking in hasNext()
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*/
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static class StreamIterator implements Iterator<ByteBuffer> {
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final InputStream is;
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final Supplier<? extends ByteBuffer> bufSupplier;
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volatile ByteBuffer nextBuffer;
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volatile boolean need2Read = true;
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volatile boolean haveNext;
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StreamIterator(InputStream is) {
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this(is, Utils::getBuffer);
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}
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StreamIterator(InputStream is, Supplier<? extends ByteBuffer> bufSupplier) {
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this.is = is;
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this.bufSupplier = bufSupplier;
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}
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// Throwable error() {
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// return error;
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// }
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private int read() {
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nextBuffer = bufSupplier.get();
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nextBuffer.clear();
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byte[] buf = nextBuffer.array();
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int offset = nextBuffer.arrayOffset();
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int cap = nextBuffer.capacity();
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try {
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int n = is.read(buf, offset, cap);
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if (n == -1) {
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is.close();
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return -1;
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}
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//flip
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nextBuffer.limit(n);
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nextBuffer.position(0);
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return n;
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} catch (IOException ex) {
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return -1;
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}
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}
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@Override
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public synchronized boolean hasNext() {
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if (need2Read) {
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haveNext = read() != -1;
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if (haveNext) {
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need2Read = false;
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}
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return haveNext;
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}
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return haveNext;
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}
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@Override
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public synchronized ByteBuffer next() {
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if (!hasNext()) {
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throw new NoSuchElementException();
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}
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need2Read = true;
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return nextBuffer;
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}
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}
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static class InputStreamPublisher implements BodyPublisher {
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private final Supplier<? extends InputStream> streamSupplier;
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InputStreamPublisher(Supplier<? extends InputStream> streamSupplier) {
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this.streamSupplier = streamSupplier;
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}
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@Override
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public void subscribe(Flow.Subscriber<? super ByteBuffer> subscriber) {
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PullPublisher<ByteBuffer> publisher;
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InputStream is = streamSupplier.get();
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if (is == null) {
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Throwable t = new IOException("streamSupplier returned null");
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publisher = new PullPublisher<>(null, t);
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} else {
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publisher = new PullPublisher<>(iterableOf(is), null);
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}
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publisher.subscribe(subscriber);
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}
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protected Iterable<ByteBuffer> iterableOf(InputStream is) {
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return () -> new StreamIterator(is);
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}
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@Override
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public long contentLength() {
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return -1;
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}
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}
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}
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