/*
* ====================================================================
* 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.apach3.http.impl.nio.codecs;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.nio.channels.WritableByteChannel;
import org.apach3.http.annotation.NotThreadSafe;
import org.apach3.http.impl.io.HttpTransportMetricsImpl;
import org.apach3.http.nio.FileContentEncoder;
import org.apach3.http.nio.reactor.SessionOutputBuffer;
/**
* Content encoder that writes data without any transformation. The end of
* the content entity is demarcated by closing the underlying connection
* (EOF condition). Entities transferred using this input stream can be of
* unlimited length.
* <p>
* This decoder is optimized to transfer data directly from
* a {@link FileChannel} to the underlying I/O session's channel whenever
* possible avoiding intermediate buffering in the session buffer.
*
* @since 4.0
*/
@NotThreadSafe
public class IdentityEncoder extends AbstractContentEncoder
implements FileContentEncoder {
public IdentityEncoder(
final WritableByteChannel channel,
final SessionOutputBuffer buffer,
final HttpTransportMetricsImpl metrics) {
super(channel, buffer, metrics);
}
public int write(final ByteBuffer src) throws IOException {
if (src == null) {
return 0;
}
assertNotCompleted();
int bytesWritten = this.channel.write(src);
if (bytesWritten > 0) {
this.metrics.incrementBytesTransferred(bytesWritten);
}
return bytesWritten;
}
public long transfer(
final FileChannel src,
long position,
long count) throws IOException {
if (src == null) {
return 0;
}
assertNotCompleted();
long bytesWritten = src.transferTo(position, count, this.channel);
if (bytesWritten > 0) {
this.metrics.incrementBytesTransferred(bytesWritten);
}
return bytesWritten;
}
@Override
public String toString() {
StringBuilder buffer = new StringBuilder();
buffer.append("[identity; completed: ");
buffer.append(this.completed);
buffer.append("]");
return buffer.toString();
}
}