/*
* 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 com.hp.hpl.jena.sparql.function;
import java.util.List ;
import com.hp.hpl.jena.query.QueryBuildException ;
import com.hp.hpl.jena.sparql.ARQInternalErrorException ;
import com.hp.hpl.jena.sparql.expr.ExprEvalException ;
import com.hp.hpl.jena.sparql.expr.ExprList ;
import com.hp.hpl.jena.sparql.expr.NodeValue ;
import com.hp.hpl.jena.sparql.util.Utils ;
/** Support for a function of one argument. */
public abstract class FunctionBase4 extends FunctionBase
{
@Override
public void checkBuild(String uri, ExprList args)
{
if ( args.size() != 4 )
throw new QueryBuildException("Function '"+Utils.className(this)+"' takes four arguments") ;
}
@Override
public final NodeValue exec(List<NodeValue> args)
{
if ( args == null )
// The contract on the function interface is that this should not happen.
throw new ARQInternalErrorException(Utils.className(this)+": Null args list") ;
if ( args.size() != 4 )
throw new ExprEvalException(Utils.className(this)+": Wrong number of arguments: Wanted 4, got "+args.size()) ;
NodeValue v1 = args.get(0) ;
NodeValue v2 = args.get(1) ;
NodeValue v3 = args.get(2) ;
NodeValue v4 = args.get(3) ;
return exec(v1, v2, v3, v4) ;
}
public abstract NodeValue exec(NodeValue v1, NodeValue v2, NodeValue v3, NodeValue v4) ;
}