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package it.unibz.inf.ontop.si.repository.impl;

import it.unibz.inf.ontop.model.type.ObjectRDFType;
import it.unibz.inf.ontop.model.type.RDFTermType;
import it.unibz.inf.ontop.model.type.TermType;

/*
 * #%L
 * ontop-reformulation-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%
 */


/***
 * A record to keep track of which tables in the semantic index tables have rows
 * in it. It allows allows to know the type of rows each has, as in, for which
 * indexes and which type of object.
 */

public class SemanticIndexViewID {
	
	private final ObjectRDFType type1;
	private final RDFTermType type2;
	private final int hashCode;

	public SemanticIndexViewID(ObjectRDFType type1, RDFTermType type2) {
		this.type1 = type1;
		this.type2 = type2;
		this.hashCode  = type2.hashCode() ^ (type1.hashCode() << 16);
	}
	
	public SemanticIndexViewID(ObjectRDFType type1) {
		this.type1 = type1;
		this.type2 = null;
		this.hashCode  = type1.hashCode();
	}

	public ObjectRDFType getType1() {
		return type1;
	}

	public RDFTermType getType2() {
		return type2;
	}
	
	@Override
	public int hashCode() {
		return hashCode;
	}
	
	@Override
	public boolean equals(Object obj) {
		if (!(obj instanceof SemanticIndexViewID))
			return false;
		
		SemanticIndexViewID r2 = (SemanticIndexViewID) obj;
		return this.type1.equals(r2.type1)
				&& ((this.type2 == null && r2.type2 == null)
				|| (this.type2 != null && r2.type2 != null
					&& this.type2.equals(r2.type2)));
	}
	

	@Override
	public String toString() {
		StringBuilder b = new StringBuilder();
		b.append(" T1: ");
		b.append(type1);
		if (type2 != null) {
			b.append(" T2: ");
			b.append(type2);
		}
		return b.toString();
	}
}