com.microsoft.azure.kusto.ingest.ResettableFileInputStream Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of kusto-ingest Show documentation

Kusto client library for ingesting data

There is a newer version: 5.2.0

// Copyright (c) Microsoft Corporation.
// Licensed under the MIT License.

package com.microsoft.azure.kusto.ingest;

import java.io.FileInputStream;
import java.io.FilterInputStream;
import java.io.IOException;
import java.nio.channels.FileChannel;

public class ResettableFileInputStream extends FilterInputStream {
    private final FileChannel myFileChannel;
    private long mark = -1;

    public ResettableFileInputStream(FileInputStream fis) {
        super(fis);
        myFileChannel = fis.getChannel();
        mark(0);
    }

    @Override
    public boolean markSupported() {
        return true;
    }

    @Override
    public synchronized void mark(int ignored) {
        try {
            mark = myFileChannel.position();
        } catch (IOException ex) {
            mark = -1;
        }
    }

    @Override
    public synchronized void reset() throws IOException {
        if (mark == -1) {
            throw new IOException("not marked");
        }
        myFileChannel.position(mark);
    }
}