/*
* 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 java.util.HashMap ;
import java.util.Map ;
import org.apache.jena.query.Syntax ;
public class UpdateParserRegistry
{
// the map contains the registered factories hashed by the syntaxes
Map<Syntax, UpdateParserFactory> factories = new HashMap<>() ;
// Singleton
static UpdateParserRegistry registry = null ;
static synchronized public UpdateParserRegistry get()
{
if ( registry == null )
init() ;
return registry;
}
private UpdateParserRegistry() { }
private static synchronized void init()
{
UpdateParserRegistry reg = new UpdateParserRegistry() ;
reg.add(Syntax.syntaxSPARQL_11,
new UpdateParserFactory() {
@Override
public boolean accept( Syntax syntax ) { return Syntax.syntaxSPARQL_11.equals(syntax) ; }
@Override
public UpdateParser create( Syntax syntax ) { return new ParserSPARQL11Update() ; } }) ;
reg.add(Syntax.syntaxARQ,
new UpdateParserFactory() {
@Override
public boolean accept(Syntax syntax ) { return Syntax.syntaxARQ.equals(syntax) ; }
@Override
public UpdateParser create ( Syntax syntax ) { return new ParserARQUpdate() ; } }) ;
registry = reg ;
}
/** Return a suitable factory for the given syntax
*
* @param syntax the syntax to be processed
* @return a parser factory or null if none accept the request
*/
public static UpdateParserFactory findFactory(Syntax syntax)
{ return get().getFactory(syntax) ; }
/** Return a suitable parser for the given syntax
*
* @param syntax the syntax to be processed
* @return a parser or null if none accept the request
*/
public static UpdateParser parser(Syntax syntax)
{ return get().createParser(syntax) ; }
/** Return a suitable parser factory for the given syntax
*
* @param syntax the syntax to be processed
* @return a parser factory or null if none accept the request
*/
public UpdateParserFactory getFactory(Syntax syntax)
{ return factories.get(syntax) ; }
/** Return a suitable parser for the given syntax
*
* @param syntax the syntax to be processed
* @return a parser or null if none accept the request
*/
public UpdateParser createParser(Syntax syntax)
{
UpdateParserFactory f = getFactory(syntax) ;
return ( f != null ) ? f.create(syntax) : null ;
}
/** Register the given parser factory for the specified syntax.
* If another factory is registered for the syntax it is replaced by the
* given one.
*/
public static void addFactory(Syntax syntax, UpdateParserFactory f)
{ get().add(syntax, f) ; }
/** Register the given parser factory for the specified syntax.
* If another factory is registered for the syntax it is replaced by the
* given one.
*/
public void add(Syntax syntax, UpdateParserFactory f)
{
if ( ! f.accept(syntax) )
throw new IllegalArgumentException( "The given parser factory does not accept the specified syntax." );
factories.put(syntax, f) ;
}
/** Unregister the parser factory associated with the given syntax */
public static void removeFactory(Syntax syntax)
{ get().remove(syntax) ; }
/** Unregister the parser factory associated with the given syntax */
public void remove(Syntax syntax)
{ factories.remove(syntax) ; }
/** Checks whether a parser factory is registered for the given syntax */
public static boolean containsParserFactory(Syntax syntax)
{ return get().containsFactory(syntax) ; }
/** Checks whether a parser factory is registered for the given syntax */
public boolean containsFactory(Syntax syntax)
{ return factories.containsKey(syntax) ; }
}