/**
* 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.Arrays;
import java.util.Collection;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import lupos.datastructures.bindings.Bindings;
import lupos.datastructures.items.Variable;
import lupos.rdf.Prefix;
import lupos.rif.IExpression;
import lupos.rif.IRuleVisitor;
import lupos.rif.RIFException;
import com.google.common.collect.Multimap;
/**
* Represents a Variable, as used in a Rule. Internally a Lupos Variable is
* used.
*
* @author jenskluttig
*
*/
public class RuleVariable extends AbstractRuleNode implements IExpression {
private Variable internalVariable;
public RuleVariable(String name) {
internalVariable = new Variable(name);
}
public String getName() {
return internalVariable.getName();
}
public Variable getVariable() {
return internalVariable;
}
public void setVariable(String name) {
internalVariable = new Variable(name);
}
@Override
public int hashCode() {
return getVariable().hashCode();
}
public <R, A> R accept(IRuleVisitor<R, A> visitor, A arg) throws RIFException {
return visitor.visit(this, arg);
}
public String getLabel() {
return internalVariable.toString();
}
public boolean containsOnlyVariables() {
return true;
}
public Set<RuleVariable> getVariables() {
Set<RuleVariable> ret = new HashSet<RuleVariable>();
ret.add(this);
return ret;
}
public List<Uniterm> getPredicates() {
return Arrays.asList();
}
public Object evaluate(Bindings binding) {
Object ret = binding.get(internalVariable);
if (ret == null)
return getVariable();
else
return ret;
}
public boolean isBound(RuleVariable var, Collection<RuleVariable> boundVars) {
return false;
}
public boolean isPossibleAssignment() {
return false;
}
public String toString(Prefix prefixInstance) {
return toString();
}
public boolean equals(Object expr) {
if (expr instanceof RuleVariable)
return ((RuleVariable) expr).getVariable().equals(internalVariable);
else
return false;
}
public Object evaluate(Bindings binding, Object optionalResult) {
return evaluate(binding);
}
public Object evaluate(Bindings binding, Object optionalResult, Multimap<IExpression, IExpression> equalities) {
return evaluate(binding);
}
}