package it.unimi.dsi.mg4j.query.nodes;
/*
* MG4J: Managing Gigabytes for Java
*
* Copyright (C) 2006-2010 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 3 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, see <http://www.gnu.org/licenses/>.
*
*/
import it.unimi.dsi.lang.MutableString;
/** A node representing a set of terms defined by a common prefix.
*
* @author Sebastiano Vigna
*/
public class Prefix implements Query {
/** The common prefix of the set of terms represented by this node. */
public final CharSequence prefix;
public Prefix( final CharSequence prefix ) {
this.prefix = prefix;
}
public String toString() {
return new MutableString().append( prefix ).append( '*' ).toString();
}
public <T> T accept( final QueryBuilderVisitor<T> visitor ) throws QueryBuilderVisitorException {
return visitor.visit( this );
}
public boolean equals( final Object o ) {
if ( ! ( o instanceof Prefix) ) return false;
return prefix.equals( ((Prefix)o).prefix );
}
public int hashCode() {
return prefix.hashCode() ^ getClass().hashCode();
}
}