/*
* 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.lang;
import org.apache.jena.query.Query ;
import org.apache.jena.query.QueryParseException ;
import org.apache.jena.query.Syntax ;
/** This class provides the root of lower level access to all the parsers.
* Each subclass hides the details of the per-language exception handlers and other
* javacc details to provide a methods that deal with setting up Query objects
* and using QueryException exceptions for problems. */
public abstract class SPARQLParser
{
public final Query parse(Query query, String queryString) throws QueryParseException
{
Query q = parse$(query, queryString) ;
validateParsedQuery(q) ;
return q ;
}
protected abstract Query parse$(Query query, String queryString) throws QueryParseException ;
public static boolean canParse(Syntax syntaxURI)
{
return SPARQLParserRegistry.get().containsFactory(syntaxURI) ;
}
public static SPARQLParser createParser(Syntax syntaxURI)
{
return SPARQLParserRegistry.get().createParser(syntaxURI) ;
}
// Do any testing of queries after the construction of the parse tree.
protected void validateParsedQuery(Query query)
{
SyntaxVarScope.check(query) ;
}
}