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package org.aksw.jena_sparql_api.views;

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


public class VarDef {
    private Expr expr;
    private RestrictionSetImpl restrictions = new RestrictionSetImpl();


    public VarDef(Expr expr) {
        this.expr = expr;
    }




    public VarDef(Expr expr, RestrictionImpl restriction) {
        this.expr = expr;

        if(restriction != null) {
            this.restrictions.stateRestriction(restriction);
        }
    }


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


    public Expr getExpr() {
        return expr;
    }


    public boolean isTermCtorExpr() {
        return expr instanceof E_RdfTerm;
    }


    public boolean isConstant() {
        return expr.isConstant();
    }


    public E_RdfTerm getTermCtorExpr() {
        return (E_RdfTerm)expr;
    }


    public NodeValue getConstant() {
        return expr.getConstant();
    }


    public RestrictionSetImpl getRestrictions() {
        return 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;
        VarDef other = (VarDef) 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;
    }
}