content: /*
   *  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.causeway.persistence.jdo.metamodel.facets.object.query;
  
  import java.util.regex.Matcher;
  import java.util.regex.Pattern;
  
  import javax.jdo.annotations.Queries;
  import javax.jdo.annotations.Query;
  
  import jakarta.inject.Inject;
  
  import org.apache.causeway.core.metamodel.context.MetaModelContext;
  import org.apache.causeway.core.metamodel.facetapi.FacetHolder;
  import org.apache.causeway.core.metamodel.facetapi.FeatureType;
  import org.apache.causeway.core.metamodel.facetapi.MetaModelRefiner;
  import org.apache.causeway.core.metamodel.facets.FacetFactoryAbstract;
  import org.apache.causeway.core.metamodel.progmodel.ProgrammingModel;
  import org.apache.causeway.core.metamodel.progmodel.ProgrammingModel.Marker;
  import org.apache.causeway.persistence.jdo.provider.entities.JdoFacetContext;
  
  public class JdoQueryAnnotationFacetFactory extends FacetFactoryAbstract
  implements MetaModelRefiner {
  
      private final JdoFacetContext jdoFacetContext;
  
      @Inject
      public JdoQueryAnnotationFacetFactory(
              final MetaModelContext mmc,
              final JdoFacetContext jdoFacetContext) {
          super(mmc, FeatureType.OBJECTS_ONLY);
          this.jdoFacetContext = jdoFacetContext;
      }
  
      @Override
      public void process(final ProcessClassContext processClassContext) {
          var cls = processClassContext.getCls();
  
          // only applies to JDO entities; ignore any view models
          if(!jdoFacetContext.isPersistenceEnhanced(cls)) {
              return;
          }
  
          final Queries namedQueriesAnnotation = processClassContext.synthesizeOnType(Queries.class).orElse(null);
          final FacetHolder facetHolder = processClassContext.getFacetHolder();
  
          if (namedQueriesAnnotation != null) {
              addFacet(
                      new JdoQueriesFacetAnnotation(namedQueriesAnnotation.value(), facetHolder));
              return;
          }
  
          final Query namedQueryAnnotation = processClassContext.synthesizeOnType(Query.class).orElse(null);
          if (namedQueryAnnotation != null) {
              addFacet(
                      new JdoQueryFacetAnnotation(namedQueryAnnotation, facetHolder));
          }
      }
  
      @Override
      public void refineProgrammingModel(final ProgrammingModel programmingModel) {
          var isValidateFromClause =
                  getConfiguration().getCore().getMetaModel().getValidator().getJdoql().isFromClause();
          if (isValidateFromClause) {
              programmingModel.addValidator(new MetaModelValidatorForJdoqlFromClause(getMetaModelContext()), Marker.JDO);
          }
  
          var isValidateVariablesClause =
                  getConfiguration().getCore().getMetaModel().getValidator().getJdoql().isVariablesClause();
          if (isValidateVariablesClause) {
              programmingModel.addValidator(new MetaModelValidatorForJdoqlVariablesClause(getMetaModelContext()), Marker.JDO);
          }
      }
  
      private static final Pattern fromPattern = Pattern.compile("SELECT.*?FROM[\\s]+([^\\s]+).*",
              Pattern.CASE_INSENSITIVE);
  
      static String from(final String query) {
          final Matcher matcher = fromPattern.matcher(query);
          return matcher.matches() ? matcher.group(1) :  null;
      }
  
      private static final Pattern variablesPattern = Pattern.compile(".*?VARIABLES[\\s]+([^\\s]+).*",
              Pattern.CASE_INSENSITIVE);
  
      static String variables(final String query) {
          final Matcher matcher = variablesPattern.matcher(query);
          return matcher.matches() ? matcher.group(1) :  null;
      }
  
  }
  