/**
* Copyright (c) 2013, Institute of Information Systems (Sven Groppe and contributors of LUPOSDATE), University of Luebeck
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
* following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice, this list of conditions and the following
* disclaimer.
* - 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.
* - Neither the name of the University of Luebeck nor the names of its contributors may be used to endorse or promote
* products derived from this software without specific prior written permission.
*
* 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 lupos.rif.model;
import java.util.Collection;
import lupos.datastructures.bindings.Bindings;
import lupos.rif.IExpression;
import lupos.rif.IRuleVisitor;
import lupos.rif.RIFException;
import lupos.rif.builtin.BooleanLiteral;
import com.google.common.collect.Multimap;
public class Disjunction extends AbstractExpressionContainer {
public void addExpr(IExpression expr) {
if (expr instanceof Disjunction)
for (IExpression obj : ((AbstractExpressionContainer) expr).exprs)
addExpr(obj);
else if (expr != null) {
if (!exprs.contains(expr)) {
expr.setParent(this);
exprs.add(expr);
}
}
}
public <R, A> R accept(IRuleVisitor<R, A> visitor, A arg) throws RIFException {
return visitor.visit(this, arg);
}
public String getLabel() {
return "Or";
}
public Object evaluate(Bindings binding) {
return evaluate(binding, null);
}
public Object evaluate(Bindings binding, Object optionalResult) {
return evaluate(binding, optionalResult, null);
}
public Object evaluate(Bindings binding, Object optionalResult, Multimap<IExpression, IExpression> equalities) {
for (IExpression expr : exprs) {
Object result = expr.evaluate(binding);
if (result instanceof BooleanLiteral) {
if (((BooleanLiteral) result).value)
return result;
} else
throw new RIFException(
"In Disjunction, only Boolean Resulttypes are allowed!");
}
return BooleanLiteral.create(false);
}
public boolean isBound(RuleVariable var, Collection<RuleVariable> boundVars) {
// In jedem Element muss die Variable gebunden sein
for (IExpression expr : exprs) {
if (!expr.isBound(var, boundVars))
return false;
}
return true;
}
public boolean isPossibleAssignment() {
return false;
}
}