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.core.metamodel.facets.param.name;
  
  import java.util.regex.Pattern;
  
  import jakarta.inject.Inject;
  
  import org.apache.causeway.commons.internal.base._Strings;
  import org.apache.causeway.core.metamodel.context.MetaModelContext;
  import org.apache.causeway.core.metamodel.facetapi.FacetUtil;
  import org.apache.causeway.core.metamodel.facetapi.FeatureType;
  import org.apache.causeway.core.metamodel.facets.FacetFactoryAbstract;
  
  /**
   * Uses JDK8+ reflection API to derive the parameter name from the code.
   * <p>
   * For Java code compiled with {@code javac} requires to be compiled with the
   * {@code -parameters} flag.
   * <p>
   * For Java code compiled with Eclipse requires to be compiled with the
   * {@code Preferences>Java>Compiler} ... {@code Store information about method parameters}
   * flag set.
   *
   * @since 2.0
   */
  public class ParameterNameFacetFactoryUsingReflection
  extends FacetFactoryAbstract {
  
      private final Pattern argXPattern = Pattern.compile("arg\\d+");
  
      @Inject
      public ParameterNameFacetFactoryUsingReflection(final MetaModelContext mmc) {
          super(mmc, FeatureType.PARAMETERS_ONLY);
      }
  
      @Override
      public void processParams(final ProcessParameterContext processParameterContext) {
  
          var parameterName = processParameterContext.getParameterName();
  
          // if not compiled with -parameters flag or synthetic, then ignore
          var argXMatcher = argXPattern.matcher(parameterName);
          if (argXMatcher.matches()){
              return;
          }
  
          var naturalName = _Strings.asNaturalName.apply(parameterName);
          var facetHolder = processParameterContext.getFacetHolder();
  
          FacetUtil.addFacet(
                  new NamedFacetForParameterUsingReflection(naturalName, facetHolder));
      }
  
  }
  