content: /*
   * Copyright ©2015-2023 Jaemon. All Rights Reserved.
   *
   * Licensed 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 com.github.jaemon.dinger.core;
  
  import java.lang.reflect.Constructor;
  import java.lang.reflect.Method;
  import java.util.LinkedList;
  import java.util.List;
  
  import org.springframework.core.ParameterNameDiscoverer;
  
  /**
   * {@link ParameterNameDiscoverer} implementation that tries several discoverer
   * delegates in succession. Those added first in the {@code addDiscoverer} method
   * have highest priority. If one returns {@code null}, the next will be tried.
   *
   * <p>The default behavior is to return {@code null} if no discoverer matches.
   *
   * @author Jaemon
   * @since 1.2
   * @see org.springframework.core.PrioritizedParameterNameDiscoverer
   */
  public class PrioritizedParameterNameDiscoverer implements ParameterNameDiscoverer {
  
      private final List<ParameterNameDiscoverer> parameterNameDiscoverers = new LinkedList<>();
  
  
      /**
       * Add a further {@link ParameterNameDiscoverer} delegate to the list of
       * discoverers that this {@code PrioritizedParameterNameDiscoverer} checks.
       * @param pnd pnd
       */
      public void addDiscoverer(ParameterNameDiscoverer pnd) {
          this.parameterNameDiscoverers.add(pnd);
      }
  
  
      @Override
      public String[] getParameterNames(Method method) {
          for (ParameterNameDiscoverer pnd : this.parameterNameDiscoverers) {
              String[] result = pnd.getParameterNames(method);
              if (result != null) {
                  return result;
              }
          }
          return null;
      }
  
      @Override
      public String[] getParameterNames(Constructor<?> ctor) {
          for (ParameterNameDiscoverer pnd : this.parameterNameDiscoverers) {
              String[] result = pnd.getParameterNames(ctor);
              if (result != null) {
                  return result;
              }
          }
          return null;
      }
  
  }