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/*

Copyright (C) SYSTAP, LLC DBA Blazegraph 2006-2016.  All rights reserved.

Contact:
     SYSTAP, LLC DBA Blazegraph
     2501 Calvert ST NW #106
     Washington, DC 20008
     [email protected]

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

*/
package com.bigdata.rdf.store;

import org.openrdf.model.Resource;
import org.openrdf.model.URI;
import org.openrdf.model.Value;

/**
 * A simple class that represents a triple (or quad) pattern.
 * 
 * @see  Efficient batch remove of
 *      a collection of triple patterns 
 */
public class BigdataTriplePattern {

//    private static final long serialVersionUID = 1L;

    private final Resource s;
    private final URI p;
    private final Value o;
    private final Resource c;

    public BigdataTriplePattern(final Resource subject,
            final URI predicate, final Value object) {

        this(subject, predicate, object, (Resource) null);

    }

    public BigdataTriplePattern(final Resource subject,
            final URI predicate, final Value object,
            final Resource context) {

        this.s = subject;

        this.p = predicate;
        
        this.o = object;
        
        this.c = context;
        
    }

    final public Resource getSubject() {

        return s;
        
    }
    
    final public URI getPredicate() {

        return p;
        
    }

    final public Value getObject() {
     
        return o;
        
    }

    final public Resource getContext() {
        
        return c;
        
    }

	@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result + ((c == null) ? 0 : c.hashCode());
		result = prime * result + ((o == null) ? 0 : o.hashCode());
		result = prime * result + ((p == null) ? 0 : p.hashCode());
		result = prime * result + ((s == null) ? 0 : s.hashCode());
		return result;
	}

	@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (getClass() != obj.getClass())
			return false;
		BigdataTriplePattern other = (BigdataTriplePattern) obj;
		if (c == null) {
			if (other.c != null)
				return false;
		} else if (!c.equals(other.c))
			return false;
		if (o == null) {
			if (other.o != null)
				return false;
		} else if (!o.equals(other.o))
			return false;
		if (p == null) {
			if (other.p != null)
				return false;
		} else if (!p.equals(other.p))
			return false;
		if (s == null) {
			if (other.s != null)
				return false;
		} else if (!s.equals(other.s))
			return false;
		return true;
	}
    
}