/*
* ====================================================================
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
*/
package org.apache.http.impl.nio.reactor;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.channels.ReadableByteChannel;
import java.nio.channels.WritableByteChannel;
import java.nio.charset.CharacterCodingException;
import java.nio.charset.Charset;
import java.nio.charset.CharsetEncoder;
import java.nio.charset.CoderResult;
import java.nio.charset.CodingErrorAction;
import org.apache.http.annotation.NotThreadSafe;
import org.apache.http.nio.reactor.SessionOutputBuffer;
import org.apache.http.nio.util.ByteBufferAllocator;
import org.apache.http.nio.util.ExpandableBuffer;
import org.apache.http.nio.util.HeapByteBufferAllocator;
import org.apache.http.params.CoreProtocolPNames;
import org.apache.http.params.HttpParams;
import org.apache.http.protocol.HTTP;
import org.apache.http.util.Args;
import org.apache.http.util.CharArrayBuffer;
import org.apache.http.util.CharsetUtils;
/**
* Default implementation of {@link SessionOutputBuffer} based on
* the {@link ExpandableBuffer} class.
*
* @since 4.0
*/
@SuppressWarnings("deprecation")
@NotThreadSafe
public class SessionOutputBufferImpl extends ExpandableBuffer implements SessionOutputBuffer {
private static final byte[] CRLF = new byte[] {HTTP.CR, HTTP.LF};
private final CharsetEncoder charencoder;
private final int lineBuffersize;
private CharBuffer charbuffer;
/**
* Creates SessionOutputBufferImpl instance.
*
* @param buffersize input buffer size
* @param lineBuffersize buffer size for line operations. Has effect only if
* {@code charencoder} is not {@code null}.
* @param charencoder charencoder to be used for encoding HTTP protocol elements.
* If {@code null} simple type cast will be used for char to byte conversion.
* @param allocator memory allocator.
* If {@code null} {@link HeapByteBufferAllocator#INSTANCE} will be used.
*
* @since 4.3
*/
public SessionOutputBufferImpl(
final int buffersize,
final int lineBuffersize,
final CharsetEncoder charencoder,
final ByteBufferAllocator allocator) {
super(buffersize, allocator != null ? allocator : HeapByteBufferAllocator.INSTANCE);
this.lineBuffersize = Args.positive(lineBuffersize, "Line buffer size");
this.charencoder = charencoder;
}
/**
* @deprecated (4.3) use
* {@link SessionOutputBufferImpl#SessionOutputBufferImpl(int, int, CharsetEncoder,
* ByteBufferAllocator)}
*/
@Deprecated
public SessionOutputBufferImpl(
final int buffersize,
final int lineBuffersize,
final ByteBufferAllocator allocator,
final HttpParams params) {
super(buffersize, allocator);
this.lineBuffersize = Args.positive(lineBuffersize, "Line buffer size");
final String charsetName = (String) params.getParameter(CoreProtocolPNames.HTTP_ELEMENT_CHARSET);
final Charset charset = CharsetUtils.lookup(charsetName);
if (charset != null) {
this.charencoder = charset.newEncoder();
final CodingErrorAction a1 = (CodingErrorAction) params.getParameter(
CoreProtocolPNames.HTTP_MALFORMED_INPUT_ACTION);
this.charencoder.onMalformedInput(a1 != null ? a1 : CodingErrorAction.REPORT);
final CodingErrorAction a2 = (CodingErrorAction) params.getParameter(
CoreProtocolPNames.HTTP_UNMAPPABLE_INPUT_ACTION);
this.charencoder.onUnmappableCharacter(a2 != null? a2 : CodingErrorAction.REPORT);
} else {
this.charencoder = null;
}
}
/**
* @deprecated (4.3) use
* {@link SessionOutputBufferImpl#SessionOutputBufferImpl(int, int, Charset)}
*/
@Deprecated
public SessionOutputBufferImpl(
final int buffersize,
final int linebuffersize,
final HttpParams params) {
this(buffersize, linebuffersize, HeapByteBufferAllocator.INSTANCE, params);
}
/**
* @since 4.3
*/
public SessionOutputBufferImpl(final int buffersize) {
this(buffersize, 256, null, HeapByteBufferAllocator.INSTANCE);
}
/**
* @since 4.3
*/
public SessionOutputBufferImpl(
final int buffersize,
final int linebuffersize,
final Charset charset) {
this(buffersize, linebuffersize,
charset != null ? charset.newEncoder() : null, HeapByteBufferAllocator.INSTANCE);
}
/**
* @since 4.3
*/
public SessionOutputBufferImpl(
final int buffersize,
final int linebuffersize) {
this(buffersize, linebuffersize, null, HeapByteBufferAllocator.INSTANCE);
}
public void reset(final HttpParams params) {
clear();
}
@Override
public int flush(final WritableByteChannel channel) throws IOException {
Args.notNull(channel, "Channel");
setOutputMode();
return channel.write(this.buffer);
}
@Override
public void write(final ByteBuffer src) {
if (src == null) {
return;
}
setInputMode();
final int requiredCapacity = this.buffer.position() + src.remaining();
ensureCapacity(requiredCapacity);
this.buffer.put(src);
}
@Override
public void write(final ReadableByteChannel src) throws IOException {
if (src == null) {
return;
}
setInputMode();
src.read(this.buffer);
}
private void write(final byte[] b) {
if (b == null) {
return;
}
setInputMode();
final int off = 0;
final int len = b.length;
final int requiredCapacity = this.buffer.position() + len;
ensureCapacity(requiredCapacity);
this.buffer.put(b, off, len);
}
private void writeCRLF() {
write(CRLF);
}
@Override
public void writeLine(final CharArrayBuffer linebuffer) throws CharacterCodingException {
if (linebuffer == null) {
return;
}
setInputMode();
// Do not bother if the buffer is empty
if (linebuffer.length() > 0 ) {
if (this.charencoder == null) {
final int requiredCapacity = this.buffer.position() + linebuffer.length();
ensureCapacity(requiredCapacity);
if (this.buffer.hasArray()) {
final byte[] b = this.buffer.array();
final int len = linebuffer.length();
final int off = this.buffer.position();
for (int i = 0; i < len; i++) {
b[off + i] = (byte) linebuffer.charAt(i);
}
this.buffer.position(off + len);
} else {
for (int i = 0; i < linebuffer.length(); i++) {
this.buffer.put((byte) linebuffer.charAt(i));
}
}
} else {
if (this.charbuffer == null) {
this.charbuffer = CharBuffer.allocate(this.lineBuffersize);
}
this.charencoder.reset();
// transfer the string in small chunks
int remaining = linebuffer.length();
int offset = 0;
while (remaining > 0) {
int l = this.charbuffer.remaining();
boolean eol = false;
if (remaining <= l) {
l = remaining;
// terminate the encoding process
eol = true;
}
this.charbuffer.put(linebuffer.buffer(), offset, l);
this.charbuffer.flip();
boolean retry = true;
while (retry) {
final CoderResult result = this.charencoder.encode(this.charbuffer, this.buffer, eol);
if (result.isError()) {
result.throwException();
}
if (result.isOverflow()) {
expand();
}
retry = !result.isUnderflow();
}
this.charbuffer.compact();
offset += l;
remaining -= l;
}
// flush the encoder
boolean retry = true;
while (retry) {
final CoderResult result = this.charencoder.flush(this.buffer);
if (result.isError()) {
result.throwException();
}
if (result.isOverflow()) {
expand();
}
retry = !result.isUnderflow();
}
}
}
writeCRLF();
}
@Override
public void writeLine(final String s) throws IOException {
if (s == null) {
return;
}
if (s.length() > 0) {
final CharArrayBuffer tmp = new CharArrayBuffer(s.length());
tmp.append(s);
writeLine(tmp);
} else {
write(CRLF);
}
}
}