package fasttext.io;

import java.io.File;

import java.io.IOException;

import java.io.InputStream;

import java.io.Reader;

import java.io.UnsupportedEncodingException;

import java.nio.charset.Charset;

public abstract class LineReader extends Reader {

protected InputStream inputStream_ = null;

protected File file_ = null;

protected Charset charset_ = null;

protected LineReader() {

super();

}

protected LineReader(Object lock) {

super(lock);

}

public LineReader(String filename, String charsetName) throws IOException, UnsupportedEncodingException {

this();

this.file_ = new File(filename);

this.charset_ = Charset.forName(charsetName);

}

public LineReader(InputStream inputStream, String charsetName) throws UnsupportedEncodingException {

this();

this.inputStream_ = inputStream;

this.charset_ = Charset.forName(charsetName);

}

/**

* Skips lines.

*

* @param n

* The number of lines to skip

* @return The number of lines actually skipped

* @exception IOException

* If an I/O error occurs

* @exception IllegalArgumentException

* If <code>n</code> is negative.

*/

public abstract long skipLine(long n) throws IOException;

public abstract String readLine() throws IOException;

public abstract String[] readLineTokens() throws IOException;

public abstract void rewind() throws IOException;

}