DefaultFileRegion.java — netty Source File

Source Code

/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project 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:
 *
 *   https://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 io.netty.channel;

import io.netty.util.AbstractReferenceCounted;
import io.netty.util.IllegalReferenceCountException;
import io.netty.util.internal.ObjectUtil;
import io.netty.util.internal.logging.InternalLogger;
import io.netty.util.internal.logging.InternalLoggerFactory;

import java.io.File;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.channels.FileChannel;
import java.nio.channels.WritableByteChannel;

import static io.netty.util.internal.ObjectUtil.checkPositiveOrZero;

/**
 * Default {@link FileRegion} implementation which transfer data from a {@link FileChannel} or {@link File}.
 *
 * Be aware that the {@link FileChannel} will be automatically closed once {@link #refCnt()} returns
 * {@code 0}.
 */
public class DefaultFileRegion extends AbstractReferenceCounted implements FileRegion {

    private static final InternalLogger logger = InternalLoggerFactory.getInstance(DefaultFileRegion.class);
    private final File f;
    private final long position;
    private final long count;
    private long transferred;
    private FileChannel file;

    /**
     * Create a new instance
     *
     * @param fileChannel      the {@link FileChannel} which should be transferred
     * @param position         the position from which the transfer should start
     * @param count            the number of bytes to transfer
     */
    public DefaultFileRegion(FileChannel fileChannel, long position, long count) {
        this.file = ObjectUtil.checkNotNull(fileChannel, "fileChannel");
        this.position = checkPositiveOrZero(position, "position");
        this.count = checkPositiveOrZero(count, "count");
        this.f = null;
    }

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