/*
 * Copyright 2012-2019 the original author or authors.
 *
 * 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
 *
 *      https://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.springframework.boot.web.client;

import java.util.function.Consumer;
import java.util.function.Supplier;

import org.springframework.aot.hint.RuntimeHints;
import org.springframework.aot.hint.TypeHint.Builder;
import org.springframework.aot.hint.TypeReference;
import org.springframework.http.client.ClientHttpRequestFactory;
import org.springframework.http.client.HttpComponentsClientHttpRequestFactory;
import org.springframework.http.client.OkHttp3ClientHttpRequestFactory;
import org.springframework.http.client.SimpleClientHttpRequestFactory;
import org.springframework.util.ClassUtils;

/**
 * A supplier for {@link ClientHttpRequestFactory} that detects the preferred candidate
 * based on the available implementations on the classpath.
 *
 * @author Stephane Nicoll
 * @author Moritz Halbritter
 * @since 2.1.0
 */
public class ClientHttpRequestFactorySupplier implements Supplier<ClientHttpRequestFactory> {

	private static final boolean APACHE_HTTP_CLIENT_PRESENT = ClassUtils.isPresent("org.apache.http.client.HttpClient",
			null);

	private static final boolean OKHTTP_CLIENT_PRESENT = ClassUtils.isPresent("okhttp3.OkHttpClient", null);

	@Override
	public ClientHttpRequestFactory get() {
		if (APACHE_HTTP_CLIENT_PRESENT) {
			return new HttpComponentsClientHttpRequestFactory();
		}
		if (OKHTTP_CLIENT_PRESENT) {
			return new OkHttp3ClientHttpRequestFactory();
		}
		return new SimpleClientHttpRequestFactory();
	}

	static class ClientHttpRequestFactorySupplierRuntimeHints {

		static void registerHints(RuntimeHints hints, ClassLoader classLoader, Consumer<Builder> callback) {
			hints.reflection().registerType(HttpComponentsClientHttpRequestFactory.class, (hint) -> callback
					.accept(hint.onReachableType(TypeReference.of("org.apache.http.client.HttpClient"))));
			hints.reflection().registerType(OkHttp3ClientHttpRequestFactory.class,
					(hint) -> callback.accept(hint.onReachableType(TypeReference.of("okhttp3.OkHttpClient"))));
			hints.reflection().registerType(SimpleClientHttpRequestFactory.class, (hint) -> callback
					.accept(hint.onReachableType(TypeReference.of(SimpleClientHttpRequestFactory.class))));
		}

	}

}

@@ -1574,90 +1574,256 @@
 nal 
-boolean APACHE_HTTP_CLIENT_PRESENT = ClassUtils.isPresent(%22org.apache.http.client.
+String APACHE_HTTP_CLIENT_CLASS = %22org.apache.http.client.HttpClient%22;%0A%0A%09private static final boolean APACHE_HTTP_CLIENT_PRESENT = ClassUtils.isPresent(APACHE_HTTP_CLIENT_CLASS, null);%0A%0A%09private static final String OKHTTP_CLIENT_CLASS = %22okhttp3.Ok
 Http
@@ -1833,18 +1833,8 @@
 ent%22
-,%0A%09%09%09null)
 ;%0A%0A%09
@@ -1907,38 +1907,35 @@
 Present(
-%22okhttp3.OkHttpClient%22
+OKHTTP_CLIENT_CLASS
 , null);
@@ -2384,16 +2384,87 @@
 back) %7B%0A
+%09%09%09if (ClassUtils.isPresent(APACHE_HTTP_CLIENT_CLASS, classLoader)) %7B%0A%09
 %09%09%09hints
@@ -2527,33 +2527,39 @@
 stFactory.class,
- 
+%0A%09%09%09%09%09%09
 (hint) -%3E callba
@@ -2552,38 +2552,32 @@
 int) -%3E callback
-%0A%09%09%09%09%09
 .accept(hint.onR
@@ -2610,49 +2610,109 @@
 .of(
-%22org.apache.http.client.HttpClient%22))));%0A
+APACHE_HTTP_CLIENT_CLASS))));%0A%09%09%09%7D%0A%09%09%09if (ClassUtils.isPresent(OKHTTP_CLIENT_CLASS, classLoader)) %7B%0A%09
 %09%09%09h
@@ -2782,24 +2782,25 @@
 class,%0A%09%09%09%09%09
+%09
 (hint) -%3E ca
@@ -2855,35 +2855,37 @@
 .of(
-%22okhttp3.OkHttpClient%22))));
+OKHTTP_CLIENT_CLASS))));%0A%09%09%09%7D
 %0A%09%09%09

Add classpath checks for runtime hints