/*
    * #%L
    * prolobjectlink-jpi-jtrolog
    * %%
    * Copyright (C) 2019 Prolobjectlink Project
    * %%
    * This program is free software: you can redistribute it and/or modify
    * it under the terms of the GNU Lesser General Public License as
    * published by the Free Software Foundation, either version 2.1 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 Lesser Public License for more details.
   * 
   * You should have received a copy of the GNU General Lesser Public
   * License along with this program.  If not, see
   * <http://www.gnu.org/licenses/lgpl-2.1.html>.
   * #L%
   */
  package io.github.prolobjectlink.prolog.jtrolog;
  
  import static io.github.prolobjectlink.prolog.PrologTermType.VARIABLE_TYPE;
  
  import io.github.prolobjectlink.prolog.ArityError;
  import io.github.prolobjectlink.prolog.FunctorError;
  import io.github.prolobjectlink.prolog.PrologProvider;
  import io.github.prolobjectlink.prolog.PrologTerm;
  import io.github.prolobjectlink.prolog.PrologVariable;
  import jTrolog.terms.Term;
  import jTrolog.terms.Var;
  
  /**
   * 
   * @author Jose Zalacain
   * @since 1.0
   */
  class JTrologVariable extends JTrologTerm implements PrologVariable {
  
  	private String name;
  
  	JTrologVariable(PrologProvider provider, int n) {
  		this(provider, "_", n);
  		this.name = "_";
  	}
  
  	JTrologVariable(PrologProvider provider, String name, int n) {
  		super(VARIABLE_TYPE, provider, name, n);
  		this.name = name;
  	}
  
  	JTrologVariable(int type, PrologProvider provider) {
  		super(type, provider);
  	}
  
  	JTrologVariable(int type, PrologProvider provider, String name, int n) {
  		super(type, provider, name, n);
  		this.name = name;
  	}
  
  	JTrologVariable(int type, PrologProvider provider, Term var) {
  		super(type, provider, var);
  	}
  
  	public boolean isAnonymous() {
  		return ((Var) value).isAnonymous();
  	}
  
  	public String getName() {
  		return name;
  	}
  
  	public void setName(String name) {
  		this.name = name;
  	}
  
  	public PrologTerm[] getArguments() {
  		return new JTrologVariable[0];
  	}
  
  	public int getArity() {
  		throw new ArityError(this);
  	}
  
  	public String getFunctor() {
  		throw new FunctorError(this);
  	}
  
  	public int getPosition() {
  		return vIndex;
  	}
  
  	@Override
  	public int hashCode() {
  		final int prime = 31;
  		int result = super.hashCode();
  		result = prime * result + ((name == null) ? 0 : name.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;
 		JTrologVariable other = (JTrologVariable) obj;
 		if (name == null) {
 			if (other.name != null)
 				return false;
 		} else if (!name.equals(other.name)) {
 			return false;
 		}
 		return true;
 	}
 
 }