/*
    * #%L
    * prolobjectlink-jpi-jtrolog
    * %%
    * Copyright (C) 2021 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.OBJECT_TYPE;
  
  import io.github.prolobjectlink.prolog.PrologProvider;
  import io.github.prolobjectlink.prolog.PrologReference;
  import io.github.prolobjectlink.prolog.PrologTerm;
  import jTrolog.terms.Struct;
  import jTrolog.terms.StructAtom;
  import jTrolog.terms.Term;
  
  public final class JTrologReference extends JTrologTerm implements PrologReference {
  
  	protected final Object reference;
  
  	protected JTrologReference(PrologProvider provider, Object reference) {
  		super(OBJECT_TYPE, provider, new Struct("'@'", new Term[] { new StructAtom("'" + reference + "'") }));
  		this.reference = reference;
  	}
  
  	@Override
  	public int getArity() {
  		return 1;
  	}
  
  	@Override
  	public String getFunctor() {
  		return "@";
  	}
  
  	@Override
  	public PrologTerm[] getArguments() {
  		String string = reference.toString();
  		PrologTerm tag = provider.newAtom(string);
  		return new PrologTerm[] { tag };
  	}
  
  	@Override
  	public PrologTerm getTerm() {
  		String string = reference.toString();
  		PrologTerm tag = provider.newAtom(string);
  		return provider.newStructure(getFunctor(), tag);
  	}
  
  	@Override
  	public Class<?> getReferenceType() {
  		return reference.getClass();
  	}
  
  	public Object getObject() {
  		return reference;
  	}
  
  	@Override
  	public String toString() {
  		return "" + getTerm() + "";
  	}
  
  	@Override
  	public int hashCode() {
  		final int prime = 31;
  		int result = 1;
  		result = prime * result + ((reference == null) ? 0 : reference.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;
  		JTrologReference other = (JTrologReference) obj;
  		if (reference == null) {
  			if (other.reference != null)
  				return false;
 		} else if (!reference.equals(other.reference)) {
 			return false;
 		}
 		return true;
 	}
 }