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A web service test double for all occasions - standalone edition

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/*
 * Copyright (C) 2014-2023 Thomas Akehurst
 *
 * 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.tomakehurst.wiremock.extension;

import static com.github.tomakehurst.wiremock.common.Exceptions.throwUnchecked;

import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.function.Function;
import java.util.function.Predicate;
import java.util.stream.Collectors;

public class ExtensionLoader {

  private ExtensionLoader() {}

  @SuppressWarnings("unchecked")
  public static  Map loadExtension(String... classNames) {
    return (Map)
        asMap(
            Arrays.stream(classNames)
                .map(toClasses())
                .map(toExtensions())
                .collect(Collectors.toList()));
  }

  public static Map load(String... classNames) {
    return loadExtension(classNames);
  }

  public static Map asMap(List extensions) {
    return extensions.stream()
        .map(extension -> Map.entry(extension.getName(), extension))
        .collect(Collectors.toUnmodifiableMap(Map.Entry::getKey, Map.Entry::getValue));
  }

  @SafeVarargs
  public static Map load(Class... classes) {
    return asMap(Arrays.stream(classes).map(toExtensions()).collect(Collectors.toList()));
  }

  private static Function, Extension> toExtensions() {
    return extensionClass -> {
      try {
        return extensionClass.getDeclaredConstructor().newInstance();
      } catch (Exception e) {
        return throwUnchecked(e, Extension.class);
      }
    };
  }

  @SuppressWarnings("unchecked")
  private static Function> toClasses() {
    return className -> {
      try {
        return (Class) Class.forName(className);
      } catch (ClassNotFoundException e) {
        return throwUnchecked(e, Class.class);
      }
    };
  }

  public static  Predicate> valueAssignableFrom(
      final Class extensionType) {
    return input -> extensionType.isAssignableFrom(input.getValue().getClass());
  }
}