code: package it.unibz.inf.ontop.model.term.impl;
  
  /*
   * #%L
   * ontop-obdalib-core
   * %%
   * Copyright (C) 2009 - 2014 Free University of Bozen-Bolzano
   * %%
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   * 
   *      http://www.apache.org/licenses/LICENSE-2.0
   * 
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   * #L%
   */
  
  import it.unibz.inf.ontop.model.term.functionsymbol.Predicate;
  
  import javax.annotation.Nonnull;
  
  
  public class PredicateImpl implements Predicate {
  
  	private final int arity;
  	private final String name;
  
  	protected PredicateImpl(@Nonnull String name, int arity) {
  		this.name = name;
  		this.arity = arity;
  	}
  
  	@Override
  	public int getArity() {
  		return arity;
  	}
  
  	@Override
  	public String getName() {
  		return name;
  	}
  
  	/**
  	 * TODO: also check arity?
  	 */
  	@Override
  	public boolean equals(Object other) {
  		return (other instanceof PredicateImpl &&
  					this.name.equals(((PredicateImpl) other).name));
  	}
  
  	@Override
  	public int hashCode() {
  		return name.hashCode();
  	}
  
  	@Override
  	public String toString() {
  		return name;
  	}
  }
  