/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.jena.sparql.function.library;
import org.apache.jena.sparql.expr.ExprEvalException ;
import org.apache.jena.sparql.expr.NodeValue ;
import org.apache.jena.sparql.function.FunctionBase1 ;
/** Example function - checks for even integers. */
public class evenInteger extends FunctionBase1
{
@Override
public NodeValue exec(NodeValue x)
{
if ( ! x.isInteger() )
throw new ExprEvalException("evenInteger: Not an intger: "+x) ;
int i = x.getInteger().getLowestSetBit() ;
boolean b = (i == -1) || ( i != 0 ) ;
return NodeValue.makeNodeBoolean( b ) ;
}
}