/*
* ====================================================================
* 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
* .
*
*/
package org.apache.hc.core5.http.nio.entity;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.Charset;
import java.nio.charset.CharsetEncoder;
import java.nio.charset.CoderResult;
import java.nio.charset.StandardCharsets;
import java.util.Set;
import org.apache.hc.core5.http.ContentType;
import org.apache.hc.core5.http.nio.AsyncEntityProducer;
import org.apache.hc.core5.http.nio.DataStreamChannel;
import org.apache.hc.core5.http.nio.StreamChannel;
import org.apache.hc.core5.util.Args;
/**
* @since 5.0
*/
public abstract class AbstractCharAsyncEntityProducer implements AsyncEntityProducer {
private enum State { ACTIVE, FLUSHING, END_STREAM }
private static final CharBuffer EMPTY = CharBuffer.wrap(new char[0]);
private final ByteBuffer bytebuf;
private final int fragmentSizeHint;
private final ContentType contentType;
private final CharsetEncoder charsetEncoder;
private final StreamChannel charDataStream;
private volatile State state;
public AbstractCharAsyncEntityProducer(
final int bufferSize,
final int fragmentSizeHint,
final ContentType contentType) {
Args.positive(bufferSize, "Buffer size");
this.fragmentSizeHint = fragmentSizeHint >= 0 ? fragmentSizeHint : bufferSize / 2;
this.bytebuf = ByteBuffer.allocate(bufferSize);
this.contentType = contentType;
Charset charset = contentType != null ? contentType.getCharset() : null;
if (charset == null) {
charset = StandardCharsets.US_ASCII;
}
this.charsetEncoder = charset.newEncoder();
this.charDataStream = new StreamChannel() {
@Override
public int write(final CharBuffer src) throws IOException {
Args.notNull(src, "Buffer");
final int p = src.position();
final CoderResult result = charsetEncoder.encode(src, bytebuf, false);
if (result.isError()) {
result.throwException();
}
return src.position() - p;
}
@Override
public void endStream() throws IOException {
state = State.FLUSHING;
}
};
this.state = State.ACTIVE;
}
protected abstract void produceData(StreamChannel channel) throws IOException;
@Override
public final String getContentType() {
return contentType != null ? contentType.toString() : null;
}
@Override
public String getContentEncoding() {
return null;
}
@Override
public boolean isChunked() {
return false;
}
@Override
public Set getTrailerNames() {
return null;
}
@Override
public final void produce(final DataStreamChannel channel) throws IOException {
if (state.compareTo(State.ACTIVE) == 0) {
produceData(charDataStream);
}
if (state.compareTo(State.ACTIVE) > 0 || !bytebuf.hasRemaining() || bytebuf.position() >= fragmentSizeHint) {
bytebuf.flip();
channel.write(bytebuf);
bytebuf.compact();
}
if (state.compareTo(State.FLUSHING) == 0) {
final CoderResult result = charsetEncoder.encode(EMPTY, bytebuf, true);
if (result.isError()) {
result.throwException();
} else if (result.isUnderflow()) {
final CoderResult result2 = charsetEncoder.flush(bytebuf);
if (result2.isError()) {
result.throwException();
} else if (result2.isUnderflow()) {
state = State.END_STREAM;
}
}
}
if (bytebuf.position() == 0 && state.compareTo(State.END_STREAM) == 0) {
channel.endStream();
}
}
}