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/*
* JBoss, Home of Professional Open Source
*
* Copyright 2013 Red Hat, Inc. and/or its affiliates.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.xnio.conduits;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.util.Arrays;
import org.xnio.Buffers;
import org.xnio.Pooled;
import org.xnio.channels.StreamSinkChannel;
/**
* A stream source conduit which buffers input.
*
* @author David M. Lloyd
*/
public final class BufferedStreamSourceConduit extends AbstractStreamSourceConduit {
private final Pooled pooledBuffer;
/**
* Construct a new instance.
*
* @param next the delegate conduit to set
* @param pooledBuffer the buffer to use
*/
public BufferedStreamSourceConduit(final StreamSourceConduit next, final Pooled pooledBuffer) {
super(next);
this.pooledBuffer = pooledBuffer;
}
public long transferTo(final long position, final long count, final FileChannel target) throws IOException {
try {
final ByteBuffer buffer = pooledBuffer.getResource();
final int lim = buffer.limit();
final int pos = buffer.position();
final int rem = lim - pos;
if (rem > 0) {
if ((long)rem > count) {
buffer.limit(pos + (int)count);
try {
return target.write(buffer, position);
} finally {
buffer.limit(lim);
}
} else {
return target.write(buffer, position);
}
} else {
return super.transferTo(position, count, target);
}
} catch (IllegalStateException ignored) {
return 0L;
}
}
public long transferTo(final long count, final ByteBuffer throughBuffer, final StreamSinkChannel target) throws IOException {
try {
final ByteBuffer buffer = pooledBuffer.getResource();
int lim;
int pos;
int rem;
lim = buffer.limit();
pos = buffer.position();
rem = lim - pos;
throughBuffer.clear();
int res;
long t = 0L;
while (rem > 0) {
if ((long)rem > count) {
buffer.limit(pos + (int)count);
try {
t += res = target.write(buffer);
} finally {
buffer.limit(lim);
}
} else {
t += res = target.write(buffer);
}
if (res == 0) {
return t;
}
pos = buffer.position();
rem = lim - pos;
}
final long lres = Conduits.transfer(next, count, throughBuffer, target);
if (lres > 0) t += lres;
return t == 0L && lres == -1L ? -1L : t;
} catch (IllegalStateException ignored) {
return -1L;
}
}
public int read(final ByteBuffer dst) throws IOException {
try {
final ByteBuffer buffer = pooledBuffer.getResource();
final int lim = buffer.limit();
final int pos = buffer.position();
final int rem = lim - pos;
if (rem > 0) {
return Buffers.copy(dst, buffer);
} else {
final int dstRem = dst.remaining();
buffer.clear();
try {
final long rres = next.read(new ByteBuffer[] { dst, buffer }, 0, 2);
if (rres == -1L) {
return -1;
}
} finally {
buffer.flip();
}
return dst.remaining() - dstRem;
}
} catch (IllegalStateException ignored) {
return -1;
}
}
public long read(final ByteBuffer[] dsts, final int offs, final int len) throws IOException {
if (len == 0) {
return 0L;
} else if (len == 1) {
return read(dsts[offs]);
} else try {
final ByteBuffer buffer = pooledBuffer.getResource();
final int lim = buffer.limit();
final int pos = buffer.position();
final int rem = lim - pos;
if (rem > 0) {
return Buffers.copy(dsts, offs, len, buffer);
} else {
final long dstRem = Buffers.remaining(dsts, offs, len);
buffer.clear();
try {
final ByteBuffer[] buffers = Arrays.copyOfRange(dsts, offs, offs + len + 1);
buffers[buffers.length - 1] = buffer;
final long rres = next.read(buffers, 0, buffers.length);
if (rres == -1) {
return -1L;
}
} finally {
buffer.flip();
}
return Buffers.remaining(dsts, offs, len) - dstRem;
}
} catch (IllegalStateException ignored) {
return -1;
}
}
public void terminateReads() throws IOException {
pooledBuffer.free();
super.terminateReads();
}
}
