immutableexternaltrieprefixdictionary.java

MG4J (Managing Gigabytes for Java) is a free full-text search engine for large document collections

package it.unimi.dsi.mg4j.util;

/*		 
* MG4J: Managing Gigabytes for Java
*
* Copyright (C) 2005-2007 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.mg4j.compression.HuTuckerCodec;
import it.unimi.dsi.mg4j.compression.PrefixCodec;
import it.unimi.dsi.mg4j.compression.PrefixCoder;

import java.io.IOException;
import java.io.Serializable;
import java.util.List;


/** An {@link it.unimi.dsi.mg4j.util.ImmutableExternalPrefixDictionary} that compresses words using
 * a {@link it.unimi.dsi.mg4j.compression.HuTuckerCodec} and approximates
 * intervals using an {@link it.unimi.dsi.mg4j.util.ImmutableTriePrefixTree}
 * that uses the same codec.
 * 
 * @author Sebastiano Vigna
 * @since 0.9.3
 * @deprecated Moved to <code>dsiutils</code>.
 */

@Deprecated
public class ImmutableExternalTriePrefixDictionary extends ImmutableExternalPrefixDictionary implements Serializable {
	
	public static final long serialVersionUID = -7046029254386353130L;
	
	public ImmutableExternalTriePrefixDictionary( final Iterable<? extends CharSequence> terms ) throws IOException {
		super( terms );
	}
	
	public ImmutableExternalTriePrefixDictionary( final Iterable<? extends CharSequence> terms, final CharSequence dumpFile ) throws IOException {
		super( terms, dumpFile );
	}
	
	public ImmutableExternalTriePrefixDictionary( final Iterable<? extends CharSequence> terms, final int blockSizeInBytes ) throws IOException {
		super( terms, blockSizeInBytes );
	}
	
	public ImmutableExternalTriePrefixDictionary( final Iterable<? extends CharSequence> terms, final int blockSizeInBytes, final CharSequence dumpStreamFilename ) throws IOException {
		super( terms, blockSizeInBytes, dumpStreamFilename );
	}
	
	protected PrefixCodec getPrefixCodec( final int frequency[] ) {
		return new HuTuckerCodec( frequency );
	}

	protected IntervalApproximator getIntervalApproximator( final List<? extends CharSequence> delimiters, final PrefixCoder prefixCoder ) {
		return new ImmutableTriePrefixTree( delimiters, prefixCoder, char2symbol );
	}
}