/*
* 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.pfunction;
import org.apache.jena.graph.Node ;
import org.apache.jena.sparql.core.Substitute ;
import org.apache.jena.sparql.engine.ExecutionContext ;
import org.apache.jena.sparql.engine.QueryIterator ;
import org.apache.jena.sparql.engine.binding.Binding ;
/** Basic property function handler that calls the implementation
* subclass one binding at a time after evaluating the arguments (if bound). */
public abstract class PropertyFunctionEval extends PropertyFunctionBase
{
protected PropertyFunctionEval(PropFuncArgType subjArgType, PropFuncArgType objFuncArgType)
{
super(subjArgType, objFuncArgType) ;
}
@Override
public final QueryIterator exec(Binding binding, PropFuncArg argSubject, Node predicate, PropFuncArg argObject, ExecutionContext execCxt)
{
argSubject = Substitute.substitute(argSubject, binding) ;
argObject = Substitute.substitute(argObject, binding) ;
return execEvaluated(binding, argSubject, predicate, argObject, execCxt) ;
}
public abstract QueryIterator execEvaluated(Binding binding, PropFuncArg argSubject, Node predicate, PropFuncArg argObject, ExecutionContext execCxt) ;
}