package it.unibz.krdb.obda.model;

/*
 * #%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 java.io.Serializable;

//import com.hp.hpl.jena.iri.IRI;

/**
 * A predicate is a property that the elements of the set have in common.
 * <p>
 * The notation {@code P(x)} is used to denote a sentence or statement {@code P}
 * concerning the variable object {@code x}. Also, the set defined by
 * {@code P(x)} written <code>{x|P(x)</code> is just a collection of all the
 * objects for which {@code P} is true.
 */
public interface Predicate extends Cloneable, Serializable {

	public enum COL_TYPE {
		OBJECT, BNODE, LITERAL, LITERAL_LANG, INTEGER, INT, NON_NEGATIVE_INTEGER, POSITIVE_INTEGER, NEGATIVE_INTEGER, NON_POSITIVE_INTEGER,UNSIGNED_INT, DECIMAL, DOUBLE, FLOAT, STRING, DATETIME, BOOLEAN, UNSUPPORTED, DATE, TIME, YEAR,  LONG
    };

	/**
	 * Get the name of the predicate. In practice, the predicate name is
	 * constructed as a URI to indicate a unique resource.
	 * 
	 * @return the resource identifier (URI).
	 */
	public String getName();

	/**
	 * Get the number of elements of the predicate.
	 * 
	 * @return an integer number.
	 */
	public int getArity();

	/***
	 * Returns the typing of the component given by component. Types can be
	 * "Object" or "Literal", defined by the inner enumerator PRED_TYPE
	 * 
	 * @param column
	 */
	public COL_TYPE getType(int column);

	/**
	 * Duplicate the object by performing a deep cloning.
	 * 
	 * @return the copy of the object.
	 */
	public Predicate clone();

	boolean isClass();

	boolean isObjectProperty();

	boolean isDataProperty();
	
	boolean isDataPredicate();
	
	boolean isBooleanPredicate();
	
	boolean isAlgebraPredicate();
	
	boolean isArithmeticPredicate();
	
	boolean isDataTypePredicate();

	boolean isTriplePredicate();
}

@@ -1446,16 +1446,24 @@
 R,  LONG
+, NULL ;
 %0A    %7D;%0A

Add COL_TYPE NULL