/**
Copyright (C) SYSTAP, LLC DBA Blazegraph 2014. All rights reserved.
Contact:
SYSTAP, LLC DBA Blazegraph
2501 Calvert ST NW #106
Washington, DC 20008
licenses@blazegraph.com
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program 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 General Public License for more details.
You should have received a copy of the GNU 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
*/
/*
* Created onJan 24, 2014
*/
package com.bigdata.rdf.model;
/**
* This class wraps a {@link BigdataStatement} and provides {@link #hashCode()}
* and {@link #equals(Object)} respecting all four fields rather than SPO as per
* the {@link org.openrdf.model.Statement} contract.
*
* @author jeremycarroll
*/
public class BigdataQuadWrapper {
private final BigdataStatement delegate;
public BigdataQuadWrapper(final BigdataStatement cspo) {
delegate = cspo;
}
@Override
public int hashCode() {
if (hash == 0) {
if ( delegate.getContext() == null ) {
hash = delegate.hashCode();
} else {
hash = delegate.getContext().hashCode() + 31 * delegate.hashCode();
}
}
return hash;
}
private int hash = 0;
@Override
public boolean equals(final Object o) {
if(this == o) return true;
if (! (o instanceof BigdataQuadWrapper)) {
return false;
}
final BigdataStatement oo = ((BigdataQuadWrapper)o).delegate;
return delegate.equals(oo) && equals(delegate.getContext(),oo.getContext());
}
private boolean equals(final BigdataResource a, final BigdataResource b) {
return a == b || (a != null && a.equals(b));
}
public BigdataStatement statement() {
return delegate;
}
}