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.commons;
  
  import java.util.function.Predicate;
  
  import org.apache.causeway.core.metamodel.spec.ObjectSpecification;
  
  /**
   * Base for visiting the meta-model.
   */
  @FunctionalInterface
  public interface MetaModelVisitor {
  
      /** whether this validator should run at all; eg. could be disabled via configuration */
      default boolean isEnabled() {
          return true;
      }
  
      /** this validator only processes {@link ObjectSpecification}(s) that pass this filter */
      Predicate<ObjectSpecification> getFilter();
  
      // -- PREDEFINED FILTERS
  
      /** all types pass this filter */
      public final static Predicate<ObjectSpecification> ALL = __->true;
  
      /** no types pass this filter */
      public final static Predicate<ObjectSpecification> NONE = __->false;
  
      /** types pass this filter, if not-injectable (aka not managed by Spring) */
      public final static Predicate<ObjectSpecification> SKIP_MANAGED_BEANS =
              spec->!spec.isInjectable();
  
      /**
       * non-abstract types pass this filter, if introspect-able
       */
      public final static Predicate<ObjectSpecification> SKIP_ABSTRACT =
              spec->!spec.isAbstract()
                  && spec.getBeanSort().policy().isIntrospectionAllowed();
  
      /** types pass this filter, if is NOT a mixin */
      public final static Predicate<ObjectSpecification> SKIP_MIXINS =
              spec->!spec.isMixin();
  
      /** types pass this filter, if IS a mixin */
      public final static Predicate<ObjectSpecification> MIXINS =
              spec->spec.isMixin();
  
      /** types pass this filter, if member-annotation is not required */
      public final static Predicate<ObjectSpecification> SKIP_WHEN_MEMBER_ANNOT_REQUIRED =
              spec->!spec
                      .getIntrospectionPolicy()
                      .getMemberAnnotationPolicy()
                      .isMemberAnnotationsRequired();
  }
  