<commit_before>
package no.uio.ifi.qure.relation;

import java.util.List;
import java.util.ArrayList;
import java.util.Set;
import java.util.HashSet;
import java.util.Map;
import java.util.HashMap;
import java.util.Arrays;

import no.uio.ifi.qure.Config;
import no.uio.ifi.qure.util.*;
import no.uio.ifi.qure.traversal.*;
import no.uio.ifi.qure.space.*;

public class Before extends AtomicRelation {

	private final int a1, a2, r1, r2;

	public Before(int r1, int r2, int a1, int a2) {
		this.a1 = a1;
		this.a2 = a2;
		this.r1 = r1;
		this.r2 = r2;
	}

	public int getArity() { return 2; }

	public Integer getArgRole(Integer pos) { return (pos.equals(a1)) ? r1 : r2; }
	
	public Set<Integer> getArguments() {
		Set<Integer> res = new HashSet<Integer>();
		res.add(a1);
		res.add(a2);
		return res;
	}

	public boolean relatesArg(int arg) {
		return a1 == arg || a2 == arg;
	}

	public String toString() {
		return "bf(<" + r1 + "," + a1 + ">, <" + r2 + "," + a2 + ">)";
	}

	public String toBTSQL(Integer[] vals, Config config) { //TODO
		return null;
	}

	public String toGeoSQL(Integer[] vals, Config config, SpaceProvider sp) {
		return sp.toSQL(this, vals, config);
	}

	public boolean isValid() {
		return false;
	}

	public boolean isIntrinsic(Integer[] tuple) {
		return tuple[a1] == tuple[a2] && strictnessRelated(r1, r2);
	}

	public Set<Map<Integer, Integer>> impliesNonEmpty(AtomicRelation r) {

		if (r instanceof Before) {
			Before bfr = (Before) r;
			if (a1 == bfr.a1 && stricterRole(bfr.r1, r1) &&<commit_msg>Added toSQL<commit_after>
package no.uio.ifi.qure.relation;

import java.util.List;
import java.util.ArrayList;
import java.util.Set;
import java.util.HashSet;
import java.util.Map;
import java.util.HashMap;
import java.util.Arrays;

import no.uio.ifi.qure.Config;
import no.uio.ifi.qure.util.*;
import no.uio.ifi.qure.traversal.*;
import no.uio.ifi.qure.space.*;

public class Before extends AtomicRelation {

	private final int a1, a2, r1, r2;

	public Before(int r1, int r2, int a1, int a2) {
		this.a1 = a1;
		this.a2 = a2;
		this.r1 = r1;
		this.r2 = r2;
	}

	public int getArity() { return 2; }

	public Integer getArgRole(Integer pos) { return (pos.equals(a1)) ? r1 : r2; }
	
	public Set<Integer> getArguments() {
		Set<Integer> res = new HashSet<Integer>();
		res.add(a1);
		res.add(a2);
		return res;
	}

	public boolean relatesArg(int arg) {
		return a1 == arg || a2 == arg;
	}

	public String toString() {
		return "bf(<" + r1 + "," + a1 + ">, <" + r2 + "," + a2 + ">)";
	}

	public String toBTSQL(Integer[] vals, Config config) { //TODO
		String[] selFroWhe = makeSelectFromWhereParts(config.btTableName, config.uriColumn, vals);
		String query = "    SELECT DISTINCT " + selFroWhe[0] + "\n";
		query += "    FROM " + selFroWhe[1] + "\n";
		query += "    WHERE ";
		if (!selFroWhe[2].equals("")) query += selFroWhe[2] + " AND\n";
		if (r0 != 0) query += "      T" + a0 + ".role & " + (r0 << 1) + " != 0 AND\n";
		if (r1 != 0) query += "      T" + a1 + ".role & " + (r1 << 1) + " != 0 AND\n";
		query += "      T" + a0 + ".block < T" + a1 + ".block";
		return query;
	}

	public String toGeoSQL(Integer[] vals, Config config, SpaceProvider sp) {
		return sp.toSQL(this, vals, config);
	}

	public boolean isValid() {
		return false;
	}

	public boolean isIntrinsic(Integer[] tuple) {
		return tuple[a1] == tuple[a2] && strictnessRelated(r1, r2);
	}

	public Set<Map<Integer, Integer>> impliesNonEmpty(AtomicRelation r) {

		if (r instanceof Before) {
			Before bfr = (Before) r;
			if (a1 == bfr.a1 && stricterRole(bfr.r1, r1) &&
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