/*
* 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 java.util.List ;
import org.apache.jena.atlas.lib.Lib ;
import org.apache.jena.query.QueryBuildException ;
import org.apache.jena.sparql.expr.ExprEvalException ;
import org.apache.jena.sparql.expr.ExprList ;
import org.apache.jena.sparql.expr.NodeValue ;
import org.apache.jena.sparql.expr.nodevalue.XSDFuncOp ;
import org.apache.jena.sparql.function.FunctionBase ;
/** substring(string, start[, finish]) - Java style */
public class substring extends FunctionBase
{
public substring() { super() ; }
@Override
public void checkBuild(String uri, ExprList args)
{
if ( args.size() != 2 && args.size() != 3 )
throw new QueryBuildException("Function '"+Lib.className(this)+"' takes two or three arguments") ;
}
@Override
public NodeValue exec(List<NodeValue> args)
{
if ( args.size() != 2 && args.size() != 3 )
throw new ExprEvalException("substring: Wrong number of arguments: "+args.size()+" : [wanted 2 or 3]") ;
NodeValue v1 = args.get(0) ;
NodeValue v2 = args.get(1) ;
NodeValue v3 = null ;
if ( args.size() == 3 )
{
v3 = args.get(2) ;
return XSDFuncOp.javaSubstring(v1, v2, v3) ;
}
return XSDFuncOp.javaSubstring(v1, v2) ;
}
}