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/*
 * This file is part of the OWL API.
 *
 * The contents of this file are subject to the LGPL License, Version 3.0.
 *
 * Copyright (C) 2011, The University of Manchester
 *
 * 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, either version 3 of the License, or
 * (at your option) any later version.
 *
 * 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, see http://www.gnu.org/licenses/.
 *
 *
 * Alternatively, the contents of this file may be used under the terms of the Apache License, Version 2.0
 * in which case, the provisions of the Apache License Version 2.0 are applicable instead of those above.
 *
 * Copyright 2011, University of Manchester
 *
 * 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.
 */
package org.coode.owlapi.rdf.model;

import static org.semanticweb.owlapi.vocab.OWLRDFVocabulary.*;

import java.util.Arrays;
import java.util.List;

import org.semanticweb.owlapi.model.IRI;

/**
 * Represents an RDF triple (S, P, O)
 * 
 * @author Matthew Horridge, The University Of Manchester, Bio-Health
 *         Informatics Group, Date: 06-Dec-2006
 */
public class RDFTriple implements Comparable {

    private RDFResourceNode subject;
    private RDFResourceNode property;
    private RDFNode object;
    private int hashCode = 0;

    /**
     * @param subject
     *        subject of triple
     * @param property
     *        property of triple
     * @param object
     *        object of triple
     */
    public RDFTriple(RDFResourceNode subject, RDFResourceNode property,
            RDFNode object) {
        this.object = object;
        this.property = property;
        this.subject = subject;
    }

    /** @return subject */
    public RDFResourceNode getSubject() {
        return subject;
    }

    /** @return property */
    public RDFResourceNode getProperty() {
        return property;
    }

    /** @return object */
    public RDFNode getObject() {
        return object;
    }

    @Override
    public int hashCode() {
        if (hashCode == 0) {
            hashCode = 17;
            hashCode = hashCode * 37 + subject.hashCode();
            hashCode = hashCode * 37 + property.hashCode();
            hashCode = hashCode * 37 + object.hashCode();
        }
        return hashCode;
    }

    @Override
    public boolean equals(Object obj) {
        if (!(obj instanceof RDFTriple)) {
            return false;
        }
        RDFTriple other = (RDFTriple) obj;
        return other.subject.equals(subject) && other.property.equals(property)
                && other.object.equals(object);
    }

    @Override
    public String toString() {
        StringBuilder sb = new StringBuilder();
        sb.append(subject.toString());
        sb.append(" -> ");
        sb.append(property.toString());
        sb.append(" -> ");
        sb.append(object.toString());
        return sb.toString();
    }

    private static final List orderedURIs = Arrays.asList(
            RDF_TYPE.getIRI(), RDFS_LABEL.getIRI(),
            OWL_EQUIVALENT_CLASS.getIRI(), RDFS_SUBCLASS_OF.getIRI(),
            OWL_DISJOINT_WITH.getIRI(), OWL_ON_PROPERTY.getIRI(),
            OWL_DATA_RANGE.getIRI(), OWL_ON_CLASS.getIRI());

    private int getIndex(IRI iri) {
        int index = orderedURIs.indexOf(iri);
        if (index == -1) {
            index = orderedURIs.size();
        }
        return index;
    }

    @Override
    public int compareTo(RDFTriple b) {
        // compare by predicate, then subject, then object
        int diff = getIndex(getProperty().getIRI())
                - getIndex(b.getProperty().getIRI());
        if (diff == 0) {
            diff = getSubject().compareTo(b.getSubject());
        }
        if (diff == 0) {
            diff = getObject().compareTo(b.getObject());
        }
        return diff;
    }
}