content: /**
   * Copyright (c) 2017-2018, the Alpha Team.
   * All rights reserved.
   *
   * Additional changes made by Siemens.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are met:
   *
   * 1) Redistributions of source code must retain the above copyright notice, this
   *    list of conditions and the following disclaimer.
   *
   * 2) Redistributions in binary form must reproduce the above copyright notice,
   *    this list of conditions and the following disclaimer in the documentation
   *    and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
   * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
   * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  package at.ac.tuwien.kr.alpha.core.common.fixedinterpretations;
  
  import at.ac.tuwien.kr.alpha.api.common.fixedinterpretations.PredicateInterpretation;
  import at.ac.tuwien.kr.alpha.api.programs.terms.ConstantTerm;
  import at.ac.tuwien.kr.alpha.api.programs.terms.Term;
  
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Set;
  
  /**
   * Template for predicate interpretations that do not generate new bindings but only return
   * a truth value.
   */
  public abstract class NonBindingPredicateInterpretation implements PredicateInterpretation {
  	private final int arity;
  
  	public NonBindingPredicateInterpretation(int arity) {
  		this.arity = arity;
  	}
  
  	public NonBindingPredicateInterpretation() {
  		this(1);
  	}
  
  	@Override
  	public Set<List<ConstantTerm<?>>> evaluate(List<Term> terms) {
  		if (terms.size() != arity) {
  			throw new IllegalArgumentException("Exactly " + arity + " term(s) required.");
  		}
  
  		final List<ConstantTerm<?>> constants = new ArrayList<>(terms.size());
  		for (int i = 0; i < terms.size(); i++) {
  			if (!(terms.get(i) instanceof ConstantTerm)) {
  				throw new IllegalArgumentException(
  					"Expected only constants as input, but got " +
  						"something else at position " + i + "."
  				);
  			}
  
  			constants.add((ConstantTerm<?>) terms.get(i));
  		}
  
  		try {
  			return test(constants) ? TRUE : FALSE;
  		} catch (ClassCastException e) {
  			throw new IllegalArgumentException("Argument types do not match.", e);
  		}
  	}
  
  	protected abstract boolean test(List<ConstantTerm<?>> terms);
  }
  