package it.unimi.dsi.io;
/*
* DSI utilities
*
* Copyright (C) 2006-2009 Sebastiano Vigna
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by the Free
* Software Foundation; either version 2.1 of the License, or (at your option)
* any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
*/
import it.unimi.dsi.lang.MutableString;
import java.io.IOException;
import java.io.Reader;
import java.io.Serializable;
/** A trivial {@link it.unimi.dsi.io.WordReader} that considers each line
* of a document a single word.
*
* <p>The intended usage of this class is that of indexing stuff like lists of document
* identifiers: if the identifiers contain nonalphabetical characters, the default
* {@link it.unimi.dsi.io.FastBufferedReader} might do a poor job.
*
* <p>Note that the non-word returned by {@link #next(MutableString, MutableString)} is
* always empty.
*/
public class LineWordReader implements WordReader, Serializable {
private static final long serialVersionUID = 1L;
/** An fast buffered reader wrapping the underlying reader. */
private FastBufferedReader fastBufferedReader = new FastBufferedReader();
public boolean next( final MutableString word, final MutableString nonWord ) throws IOException {
nonWord.length( 0 );
return fastBufferedReader.readLine( word ) != null;
}
public LineWordReader setReader( final Reader reader ) {
fastBufferedReader.setReader( reader );
return this;
}
public LineWordReader copy() {
return new LineWordReader();
}
}