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.objectvalue.mustsatisfyspec;
  
  import org.apache.causeway.applib.services.i18n.TranslatableString;
  import org.apache.causeway.applib.services.i18n.TranslationContext;
  import org.apache.causeway.applib.services.i18n.TranslationService;
  import org.apache.causeway.applib.spec.Specification;
  import org.apache.causeway.applib.spec.Specification2;
  import org.apache.causeway.applib.util.ReasonBuffer;
  
  /**
   * Encapsulates the algorithm for evaluating {@link Specification}s that might optionally be
   * translatable (ie extend {@link Specification2}).
   */
  public class SpecificationEvaluator {
  
      private final TranslationService translationService;
      private final TranslationContext translationContext;
  
      public SpecificationEvaluator(
              final TranslationService translationService,
              final TranslationContext translationContext) {
          this.translationService = translationService;
          this.translationContext = translationContext;
      }
  
      public Evaluation evaluation() {
          return new Evaluation();
      }
  
      public class Evaluation {
  
          final ReasonBuffer reasonBuffer = new ReasonBuffer();
  
          public Evaluation evaluate(final Iterable<Specification> specifications, final Object proposedObject) {
              for (final Specification specification : specifications) {
                  evaluate(specification, proposedObject);
              }
              return this;
          }
  
          public Evaluation evaluate(final Specification specification, final Object proposedObject) {
              if (specification instanceof Specification2) {
                  final Specification2 specification2 = (Specification2) specification;
                  final TranslatableString translatableReason = specification2.satisfiesTranslatable(proposedObject);
                  if (translatableReason != null) {
                      final String translatedReason = translatableReason.translate(translationService, translationContext);
                      reasonBuffer.append(translatedReason);
                  }
              } else {
                  final String satisfies = specification.satisfies(proposedObject);
                  reasonBuffer.append(satisfies);
              }
              return this;
          }
  
          public String getReason() {
              return reasonBuffer.getReason();
          }
      }
  
  }
  