edu.umn.cs.spatialHadoop.io.MemoryInputStream.java Source code

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Here is the source code for edu.umn.cs.spatialHadoop.io.MemoryInputStream.java

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/***********************************************************************
* Copyright (c) 2015 by Regents of the University of Minnesota.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Apache License, Version 2.0 which 
* accompanies this distribution and is available at
* http://www.opensource.org/licenses/apache2.0.php.
*
*************************************************************************/
package edu.umn.cs.spatialHadoop.io;

import java.io.ByteArrayInputStream;
import java.io.IOException;

import org.apache.hadoop.fs.PositionedReadable;
import org.apache.hadoop.fs.Seekable;

public class MemoryInputStream extends ByteArrayInputStream implements Seekable, PositionedReadable {

    int originalOffset;

    public MemoryInputStream(byte[] buf, int offset, int length) {
        super(buf, offset, length);
        originalOffset = offset;
    }

    public MemoryInputStream(byte[] buf) {
        super(buf);
    }

    public long getPos() {
        return pos - originalOffset;
    }

    @Override
    public void seek(long pos) throws IOException {
        this.mark = originalOffset;
        this.reset();
        this.skip(pos);
    }

    @Override
    public boolean seekToNewSource(long targetPos) throws IOException {
        return false;
    }

    @Override
    public int read(long position, byte[] buffer, int offset, int length) throws IOException {
        // TODO Auto-generated method stub
        return 0;
    }

    @Override
    public void readFully(long position, byte[] buffer, int offset, int length) throws IOException {
        System.arraycopy(buf, (int) (originalOffset + position), buffer, offset, length);
    }

    @Override
    public void readFully(long position, byte[] buffer) throws IOException {
        readFully(position, buffer, 0, buffer.length);
    }
}