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.methods;
  
  import java.util.Optional;
  import java.util.stream.Stream;
  
  import org.springframework.util.ClassUtils;
  
  import org.apache.causeway.commons.collections.Can;
  import org.apache.causeway.commons.internal.reflection._ClassCache;
  import org.apache.causeway.commons.internal.reflection._GenericResolver.ResolvedConstructor;
  import org.apache.causeway.commons.internal.reflection._GenericResolver.ResolvedMethod;
  import org.apache.causeway.commons.internal.reflection._Reflect;
  import org.apache.causeway.core.metamodel.commons.MethodUtil;
  
  import org.jspecify.annotations.NonNull;
  import lombok.experimental.UtilityClass;
  
  /**
   * In support of <i>Parameters as a Tuple</i> (PAT).
   */
  @UtilityClass
  public final class MethodFinderPAT {
  
      // -- PAT SUPPORT
  
      public record MethodAndPatConstructor(
          @NonNull ResolvedMethod supportingMethod,
          @NonNull ResolvedConstructor patConstructor) {
      }
  
      // -- SEARCH FOR MULTIPLE NAME CANDIDATES (PAT)
  
      public Stream<MethodAndPatConstructor> findMethodWithPATArg(
              final MethodFinder finder,
              final Class<?>[] signature,
              final Can<Class<?>> additionalParamTypes) {
  
          return finder.streamMethodsIgnoringSignature()
              .filter(MethodUtil.Predicates.paramCount(1 + additionalParamTypes.size()))
              .filter(MethodUtil.Predicates.matchParamTypes(1, additionalParamTypes))
              .map(method->lookupPatConstructor(method, signature))
              .flatMap(Optional::stream);
      }
  
      // -- HELPER
  
      private Optional<MethodAndPatConstructor> lookupPatConstructor(
              final ResolvedMethod supportingMethod,
              final Class<?>[] signature) {
  
          var patCandidate = supportingMethod.paramType(0);
  
          // just an optimization, not strictly required
          if(ClassUtils.isPrimitiveOrWrapper(patCandidate)
                  || _Reflect.isJavaApiClass(patCandidate)) {
              return Optional.empty();
          }
  
          var classCache = _ClassCache.getInstance();
  
          return classCache
                  .lookupPublicConstructor(patCandidate, signature)
                  .map(constructor->new MethodAndPatConstructor(supportingMethod, constructor));
      }
  
  }
  