SeekableInputStream.java Source code

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Here is the source code for SeekableInputStream.java

Source

/**
 * Copyright 2011 Yusuke Matsubara
 *
 * 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.
 */

import java.io.FilterInputStream;
import java.io.IOException;

import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.Seekable;
import org.apache.hadoop.io.compress.CompressionCodecFactory;
import org.apache.hadoop.mapred.FileSplit;

//hello
public class SeekableInputStream extends FilterInputStream implements Seekable {
    private final Seekable seek;

    public SeekableInputStream(FSDataInputStream in) {
        super(in);
        this.seek = in;

    }

    public static SeekableInputStream getInstance(Path path, long start, long end, FileSystem fs,
            CompressionCodecFactory compressionCodecs) throws IOException {
        FSDataInputStream din = fs.open(path);
        din.seek(start);
        return new SeekableInputStream(din);
    }

    public static SeekableInputStream getInstance(FileSplit split, FileSystem fs,
            CompressionCodecFactory compressionCodecs) throws IOException {
        return getInstance(split.getPath(), split.getStart(), split.getStart() + split.getLength(), fs,
                compressionCodecs);
    }

    public long getPos() throws IOException {
        return this.seek.getPos();
    }

    public void seek(long pos) throws IOException {
        this.seek.seek(pos);
    }

    public boolean seekToNewSource(long targetPos) throws IOException {
        return this.seek.seekToNewSource(targetPos);
    }

    @Override
    public String toString() {
        return this.in.toString();
    }
}