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package org.aksw.jena_sparql_api.views;

import org.aksw.jena_sparql_api.restriction.RestrictionSetImpl;
import org.apache.jena.sparql.expr.Expr;

/**
 * [SPARQL level]
 *
 * A restrictedExpr is comprised of
 * - An SPARQL expression
 * - restrictions associated with its corresponding value after evaluation         (under some interpretation)
 *
 * Example:
 * Some expression can be declared to yield integers in the range [0..4]
 * or uris with certain prefixes.
 *
 *
 *
 * @author Claus Stadler 
 *
 */
public class RestrictedExpr {
    private Expr expr;
    private RestrictionSetImpl restrictions;

    public RestrictedExpr(Expr expr) {
        this(expr, new RestrictionSetImpl());
    }

    public RestrictedExpr(Expr expr, RestrictionSetImpl restrictions) {
        super();
        this.expr = expr;
        this.restrictions = restrictions;
    }

    public static RestrictedExpr create(Expr expr) {
        return new RestrictedExpr(expr);
    }

    public static RestrictedExpr create(Expr expr, RestrictionSetImpl restrictions) {
        return new RestrictedExpr(expr, restrictions);
    }


    public Expr getExpr() {
        return expr;
    }


    public RestrictionSetImpl getRestrictions() {
        return restrictions;
    }

    @Override
    public String toString() {
        return "RestrictedExpr [expr=" + expr + ", restrictions="
                + restrictions + "]";
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((expr == null) ? 0 : expr.hashCode());
        result = prime * result
                + ((restrictions == null) ? 0 : restrictions.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;
        RestrictedExpr other = (RestrictedExpr) obj;
        if (expr == null) {
            if (other.expr != null)
                return false;
        } else if (!expr.equals(other.expr))
            return false;
        if (restrictions == null) {
            if (other.restrictions != null)
                return false;
        } else if (!restrictions.equals(other.restrictions))
            return false;
        return true;
    }
}