it.tidalwave.semantic.io.impl.StatementComparator Maven / Gradle / Ivy
/***********************************************************************************************************************
*
* blueBill Core - open source birding
* Copyright (C) 2009-2011 by Tidalwave s.a.s. (http://www.tidalwave.it)
*
***********************************************************************************************************************
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
* an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
* specific language governing permissions and limitations under the License.
*
***********************************************************************************************************************
*
* WWW: http://bluebill.tidalwave.it
* SCM: https://kenai.com/hg/bluebill~core-src
*
**********************************************************************************************************************/
package it.tidalwave.semantic.io.impl;
import javax.annotation.Nonnull;
import java.util.Comparator;
import org.openrdf.model.Statement;
/***********************************************************************************************************************
*
* @author Fabrizio Giudici
* @version $Id$
*
**********************************************************************************************************************/
public class StatementComparator implements Comparator
{
public int compare (final @Nonnull Statement s1, final @Nonnull Statement s2)
{
int d = s1.getSubject().stringValue().compareTo(s2.getSubject().stringValue());
if (d == 0)
{
d = fixed(s1.getPredicate().stringValue()).compareTo(fixed(s2.getPredicate().stringValue()));
}
if (d == 0)
{
d = s1.getObject().stringValue().compareTo(s2.getObject().stringValue());
}
return d;
}
@Nonnull
private String fixed (final @Nonnull String string) // puts rdf:type on top
{
return string.equals("http://www.w3.org/1999/02/22-rdf-syntax-ns#type") ? "____" + string : string;
}
}