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The Async Http Client (AHC) classes.

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/*
 *    Copyright (c) 2014-2024 AsyncHttpClient Project. All rights reserved.
 *
 *    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.asynchttpclient.netty.request.body;

import io.netty.channel.FileRegion;
import io.netty.util.AbstractReferenceCounted;
import org.asynchttpclient.request.body.RandomAccessBody;

import java.io.IOException;
import java.nio.channels.WritableByteChannel;

import static java.util.Objects.requireNonNull;
import static org.asynchttpclient.util.MiscUtils.closeSilently;

/**
 * Adapts a {@link RandomAccessBody} to Netty's {@link FileRegion}.
 */
class BodyFileRegion extends AbstractReferenceCounted implements FileRegion {

    private final RandomAccessBody body;
    private long transferred;

    BodyFileRegion(RandomAccessBody body) {
        this.body = requireNonNull(body, "body");
    }

    @Override
    public long position() {
        return 0;
    }

    @Override
    public long count() {
        return body.getContentLength();
    }

    @Override
    public long transfered() {
        return transferred();
    }

    @Override
    public long transferred() {
        return transferred;
    }

    @Override
    public FileRegion retain() {
        super.retain();
        return this;
    }

    @Override
    public FileRegion retain(int increment) {
        super.retain(increment);
        return this;
    }

    @Override
    public FileRegion touch() {
        return this;
    }

    @Override
    public FileRegion touch(Object hint) {
        return this;
    }

    @Override
    public long transferTo(WritableByteChannel target, long position) throws IOException {
        long written = body.transferTo(target);
        if (written > 0) {
            transferred += written;
        }
        return written;
    }

    @Override
    protected void deallocate() {
        closeSilently(body);
    }
}