/*
* Copyright 2011 Revelytix Inc.
*
* 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.
*/
package spark.spi;
import java.math.BigInteger;
import java.net.URI;
import java.util.Collections;
import java.util.Date;
import java.util.List;
import spark.api.Command;
import spark.api.Solutions;
import spark.api.exception.SparqlException;
import spark.api.rdf.BlankNode;
import spark.api.rdf.Literal;
import spark.api.rdf.NamedNode;
import spark.api.rdf.RDFNode;
/**
* @author Alex Hall
* @date Jul 28, 2011
*/
public abstract class BaseSolutions extends BaseResults implements Solutions {
protected final List<String> vars;
/**
* @param command
*/
public BaseSolutions(Command command, List<String> vars) {
super(command);
this.vars = Collections.unmodifiableList(vars);
}
@Override
public boolean isBound(String variable) {
return getResult().get(variable) != null;
}
@Override
public List<String> getVariables() {
return this.vars;
}
@Override
public RDFNode getBinding(String variable) {
return getResult().get(variable);
}
@Override
public NamedNode getNamedNode(String variable) throws SparqlException {
Object value = this.getBinding(variable);
if(value == null) {
return null;
} else if(value instanceof NamedNode) {
return (NamedNode) value;
} else {
throw new SparqlException("Node for variable " + variable + " contains a " + value.getClass().getName() + ", not a NamedNode.");
}
}
@Override
public URI getURI(String variable) throws SparqlException {
return getNamedNode(variable).getURI();
}
@Override
public BlankNode getBlankNode(String variable) throws SparqlException {
Object value = this.getBinding(variable);
if(value == null) {
return null;
} else if(value instanceof BlankNode) {
return (BlankNode) value;
} else {
throw new SparqlException("Node for variable " + variable + " contains a " + value.getClass().getName() + ", not a BlankNode.");
}
}
@Override
public Literal getLiteral(String variable) throws SparqlException {
Object value = this.getBinding(variable);
if(value == null) {
return null;
} else if(value instanceof Literal) {
return (Literal) value;
} else {
throw new SparqlException("Node for variable " + variable + " contains a " + value.getClass().getName() + ", not a Literal.");
}
}
@Override
public Date getDateTime(String variable) throws SparqlException {
return Conversions.toDateTime(getLiteral(variable).getLexical());
}
@Override
public BigInteger getInteger(String variable) throws SparqlException {
return Conversions.toBigInteger(getLiteral(variable).getLexical());
}
@Override
public boolean getBoolean(String variable) throws SparqlException {
return Conversions.toBoolean(getLiteral(variable).getLexical());
}
@Override
public double getDouble(String variable) throws SparqlException {
return Conversions.toDouble(getLiteral(variable).getLexical());
}
@Override
public float getFloat(String variable) throws SparqlException {
return Conversions.toFloat(getLiteral(variable).getLexical());
}
@Override
public int getInt(String variable) throws SparqlException {
return Conversions.toInteger(getLiteral(variable).getLexical());
}
@Override
public String getString(String variable) throws SparqlException {
return getLiteral(variable).getLexical();
}
}