# RdfQueryParserFactory.java

    /*
     * Copyright 2009 Niclas Hedhman.
     *
     * Licensed  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.qi4j.index.rdf.query;

    import org.openrdf.query.QueryLanguage;
    import org.qi4j.api.injection.scope.Service;
    import org.qi4j.api.injection.scope.Structure;
    import org.qi4j.api.mixin.Mixins;
    import org.qi4j.api.service.ServiceComposite;
    import org.qi4j.api.service.qualifier.Tagged;
    import org.qi4j.api.value.ValueSerialization;
    import org.qi4j.api.value.ValueSerializer;
    import org.qi4j.index.rdf.UnsupportedLanguageException;
    import org.qi4j.index.rdf.query.internal.RdfQueryParserImpl;
    import org.qi4j.spi.Qi4jSPI;

    @Mixins( RdfQueryParserFactory.RdfQueryParserFactoryMixin.class )
    public interface RdfQueryParserFactory
        extends ServiceComposite
    {
        RdfQueryParser newQueryParser( QueryLanguage language );

        abstract class RdfQueryParserFactoryMixin
            implements RdfQueryParserFactory
        {
            @Structure
            private Qi4jSPI spi;
            @Service
            @Tagged( ValueSerialization.Formats.JSON )
            private ValueSerializer valueSerializer;

            @Override
            public RdfQueryParser newQueryParser( QueryLanguage language )
            {
                if( language.equals( QueryLanguage.SPARQL ) )
                {
                    return new RdfQueryParserImpl( spi, valueSerializer );
                }
                throw new UnsupportedLanguageException( language );
            }
        }
    }