/*
* 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.library;
import com.hp.hpl.jena.sparql.ARQInternalErrorException ;
import com.hp.hpl.jena.sparql.engine.binding.Binding ;
import com.hp.hpl.jena.sparql.expr.E_Regex ;
import com.hp.hpl.jena.sparql.expr.Expr ;
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.function.Function ;
import com.hp.hpl.jena.sparql.function.FunctionEnv ;
/** Function for XPath fn:matches */
public class FN_Matches implements Function
{
// Wrapper around an E_Regex. Maybe move actual regex to Function.regex.
E_Regex regex = null;
ExprList myArgs = null ;
@Override
public void build(String uri, ExprList args)
{
if ( args.size() != 3 && args.size() != 2 )
throw new ExprEvalException("matches: Wrong number of arguments: Wanted 2 or 3, got "+args.size()) ;
myArgs = args ;
}
@Override
public NodeValue exec(Binding binding, ExprList args, String uri, FunctionEnv env)
{
if ( myArgs != args )
throw new ARQInternalErrorException("matches: Arguments have changed since checking") ;
Expr expr = args.get(0) ;
E_Regex regexEval = regex ;
if ( regexEval == null )
{
Expr e1 = args.get(1) ;
Expr e2 = null ;
if ( args.size() == 3 )
e2 = args.get(2) ;
String pattern = e1.eval(binding, env).getString() ;
String flags = (e2==null)?null : e2.eval(binding, env).getString() ;
regexEval = new E_Regex(expr, pattern, flags) ;
// Cache if the pattern is fixed and the flags are fixed or non-existant
if ( e1 instanceof NodeValue && ( e2 == null || e2 instanceof NodeValue ) )
regex = regexEval ;
}
NodeValue nv = regexEval.eval(binding, env) ;
return nv ;
}
}