/*
* 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.engine.binding.Binding ;
import org.apache.jena.sparql.expr.E_Call ;
import org.apache.jena.sparql.expr.ExprList ;
import org.apache.jena.sparql.expr.NodeValue ;
import org.apache.jena.sparql.function.Function ;
import org.apache.jena.sparql.function.FunctionEnv ;
/** Function that evaluates an expression.
* To convert errors to true or false, use COALESCE.
*/
public class eval implements Function
{
@Override
public void build(String uri, ExprList args) {}
/** Processes unevaluated arguments */
@Override
public NodeValue exec(Binding binding, ExprList args, String uri, FunctionEnv env)
{
E_Call e = new E_Call(args) ;
NodeValue nv = e.evalSpecial(binding, env) ;
if ( nv != null )
return nv ;
return e.eval(binding, env) ;
}
}