/*
* Copyright 2008 Fedora Commons, 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 org.mulgara.sparql;
import org.mulgara.query.Variable;
/**
* Creates variables to use for constants.
*
* @created Jun 30, 2008
* @author Paula Gearon
* @copyright © 2008 <a href="http://www.fedora-commons.org/">Fedora Commons</a>
*/
public class ConstantVarFactory {
/** A label to use for all "constant" variables. */
private static final String PREFIX = "c";
/** The internal incrementing counter for identifying variables. */
private int id;
/** Creates a new factory, with a fresh counter. */
ConstantVarFactory() {
id = 0;
}
/**
* Allocate a new variable.
* @return The new variable.
*/
public Variable newVar() {
return new Variable(PREFIX + id++);
}
}