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Rule base analysis for InteGraal. This is imported from Graal
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/*
 * Copyright (C) Inria Sophia Antipolis - Méditerranée / LIRMM
 * (Université de Montpellier & CNRS) (2014 - 2017)
 *
 * Contributors :
 *
 * Clément SIPIETER 
 * Mélanie KÖNIG
 * Swan ROCHER
 * Jean-François BAGET
 * Michel LECLÈRE
 * Marie-Laure MUGNIER 
 *
 *
 * This file is part of Graal .
 *
 * This software is governed by the CeCILL  license under French law and
 * abiding by the rules of distribution of free software.  You can  use,
 * modify and/ or redistribute the software under the terms of the CeCILL
 * license as circulated by CEA, CNRS and INRIA at the following URL
 * "http://www.cecill.info".
 *
 * As a counterpart to the access to the source code and  rights to copy,
 * modify and redistribute granted by the license, users are provided only
 * with a limited warranty  and the software's author,  the holder of the
 * economic rights,  and the successive licensors  have only  limited
 * liability.
 *
 * In this respect, the user's attention is drawn to the risks associated
 * with loading,  using,  modifying and/or developing or reproducing the
 * software by the user in light of its specific status of free software,
 * that may mean  that it is complicated to manipulate,  and  that  also
 * therefore means  that it is reserved for developers  and  experienced
 * professionals having in-depth computer knowledge. Users are therefore
 * encouraged to load and test the software's suitability as regards their
 * requirements in conditions enabling the security of their systems and/or
 * data to be ensured and,  more generally, to use and operate it in the
 * same conditions as regards security.
 *
 * The fact that you are presently reading this means that you have had
 * knowledge of the CeCILL license and that you accept its terms.
 */
/**
* 
*/
package fr.lirmm.graphik.integraal.core;

import java.util.Collection;
import java.util.LinkedList;
import java.util.List;

import fr.lirmm.graphik.integraal.api.core.ConjunctiveQuery;
import fr.lirmm.graphik.integraal.api.core.EffectiveConjunctiveQuery;
import fr.lirmm.graphik.integraal.api.core.Term;
import fr.lirmm.graphik.integraal.api.core.UnionOfConjunctiveQueries;
import fr.lirmm.graphik.util.stream.CloseableIterator;
import fr.lirmm.graphik.util.stream.CloseableIteratorAdapter;
import fr.lirmm.graphik.util.stream.CloseableIteratorWithoutException;
import fr.lirmm.graphik.util.stream.IteratorException;

/**
 * This class represents query which is the union of conjunctive queries.
 * 
 * @author Clément Sipieter (INRIA) [email protected]
 *
 */
public class DefaultUnionOfConjunctiveQueries implements UnionOfConjunctiveQueries {

	private String label = "";
	private Collection queries;
	private List ans;

	// /////////////////////////////////////////////////////////////////////////
	// CONSTRUCTORS
	// /////////////////////////////////////////////////////////////////////////

	public DefaultUnionOfConjunctiveQueries(List ans, Collection queries) {
		this.ans = ans;
		this.queries = new LinkedList();

		for (ConjunctiveQuery cq : queries)
			this.queries.add(new DefaultEffectiveConjunctiveQuery(cq, null));
	}

	public DefaultUnionOfConjunctiveQueries(List ans, CloseableIteratorWithoutException queries) {
		this.ans = ans;
		this.queries = new LinkedList();

		while (queries.hasNext()) {
			this.queries.add(queries.next());
		}
		queries.close();
	}

	public DefaultUnionOfConjunctiveQueries(List ans, CloseableIterator queries) throws IteratorException {
		this.ans = ans;
		this.queries = new LinkedList();

		while (queries.hasNext()) {
			this.queries.add(queries.next());
		}
		queries.close();
	}

	public DefaultUnionOfConjunctiveQueries(List ans, ConjunctiveQuery... queries) {
		this.ans = ans;
		this.queries = new LinkedList();

		for (ConjunctiveQuery cq : queries)
			this.queries.add(new DefaultEffectiveConjunctiveQuery(cq, null));
	}

	// /////////////////////////////////////////////////////////////////////////
	// PUBLIC METHODS
	// /////////////////////////////////////////////////////////////////////////

	@Override
	public List getAnswerVariables() {
		return this.ans;
	}

	@Override
	public List getConjunctiveQueries() {
		List ret = new LinkedList<>();

		for (EffectiveConjunctiveQuery item : queries) {
			ret.add(item.getQuery());
		}
		return ret;
	}

	@Override
	public CloseableIteratorWithoutException iterator() {
		return new CloseableIteratorAdapter(this.queries.iterator());
	}

	@Override
	public boolean isEmpty() {
		return this.queries.isEmpty();
	}

	@Override
	public int size() {
		return this.queries.size();
	}

	@Override
	public boolean isBoolean() {
		return this.ans.isEmpty();
	}

	public void setLabel(String label) {
		this.label = label;
	}

	@Override
	public String getLabel() {
		return this.label;
	}

	// /////////////////////////////////////////////////////////////////////////
	// OBJECT METHODS
	// /////////////////////////////////////////////////////////////////////////

	@Override
	public String toString() {
		StringBuilder sb = new StringBuilder();
		this.appendTo(sb);
		return sb.toString();
	}

	@Override
	public void appendTo(StringBuilder sb) {
		for (EffectiveConjunctiveQuery q : this.queries) {
			sb.append(q.getQuery());
			sb.append(q.getSubstitution());
			sb.append("\n| ");
		}
	}

}