/*
* ====================================================================
* 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.io.UnsupportedEncodingException;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.Charset;
import java.nio.charset.CharsetDecoder;
import java.nio.charset.CoderResult;
import java.nio.charset.StandardCharsets;
import java.nio.charset.UnsupportedCharsetException;
import java.util.List;
import org.apache.hc.core5.concurrent.FutureCallback;
import org.apache.hc.core5.http.EntityDetails;
import org.apache.hc.core5.http.Header;
import org.apache.hc.core5.http.HttpException;
import org.apache.hc.core5.http.ContentType;
import org.apache.hc.core5.http.nio.AsyncEntityConsumer;
import org.apache.hc.core5.util.Args;
/**
* @since 5.0
*/
public abstract class AbstractCharAsyncEntityConsumer implements AsyncEntityConsumer {
private static final ByteBuffer EMPTY = ByteBuffer.wrap(new byte[0]);
private volatile ContentType contentType;
private volatile CharsetDecoder charsetDecoder;
private volatile CharBuffer charbuf;
protected abstract void dataStart(ContentType contentType, FutureCallback resultCallback) throws HttpException, IOException;
protected abstract void consumeData(CharBuffer src) throws IOException;
protected abstract void dataEnd() throws IOException;
@Override
public final void streamStart(
final EntityDetails entityDetails,
final FutureCallback resultCallback) throws IOException, HttpException {
Args.notNull(resultCallback, "Result callback");
try {
this.contentType = entityDetails != null ? ContentType.parse(entityDetails.getContentType()) : null;
dataStart(this.contentType, resultCallback);
} catch (UnsupportedCharsetException ex) {
throw new UnsupportedEncodingException(ex.getMessage());
}
}
private void checkResult(final CoderResult result) throws IOException {
if (result.isError()) {
result.throwException();
}
}
private void doDecode() throws IOException {
charbuf.flip();
final int chunk = charbuf.remaining();
if (chunk > 0) {
consumeData(charbuf);
}
charbuf.clear();
}
@Override
public final int consume(final ByteBuffer src) throws IOException {
Args.notNull(src, "ByteBuffer");
if (charsetDecoder == null) {
Charset charset = contentType != null ? contentType.getCharset() : null;
if (charset == null) {
charset = StandardCharsets.US_ASCII;
}
charsetDecoder = charset.newDecoder();
}
if (charbuf == null) {
charbuf = CharBuffer.allocate(2048);
}
while (src.hasRemaining()) {
checkResult(charsetDecoder.decode(src, charbuf, false));
doDecode();
}
return Integer.MAX_VALUE;
}
@Override
public final void streamEnd(final List extends Header> trailers) throws IOException {
if (charsetDecoder != null) {
if (charbuf == null) {
charbuf = CharBuffer.allocate(512);
}
checkResult(charsetDecoder.decode(EMPTY, charbuf, true));
doDecode();
checkResult(charsetDecoder.flush(charbuf));
doDecode();
}
dataEnd();
}
}