library-mv-pt-2

libraries-http/src/main/java/com/baeldung/retrofitguide/GitHubServiceGenerator.java

@@ -0,0 +1,51 @@
+package com.baeldung.retrofitguide;
+
+import java.io.IOException;
+import okhttp3.Interceptor;
+import okhttp3.OkHttpClient;
+import okhttp3.Request;
+import okhttp3.Response;
+import okhttp3.logging.HttpLoggingInterceptor;
+import retrofit2.Retrofit;
+import retrofit2.converter.gson.GsonConverterFactory;
+
+public class GitHubServiceGenerator {
+
+    private static final String BASE_URL = "https://api.github.com/";
+
+    private static Retrofit.Builder builder = new Retrofit.Builder().baseUrl(BASE_URL).addConverterFactory(GsonConverterFactory.create());
+
+    private static Retrofit retrofit = builder.build();
+
+    private static OkHttpClient.Builder httpClient = new OkHttpClient.Builder();
+
+    private static HttpLoggingInterceptor logging = new HttpLoggingInterceptor().setLevel(HttpLoggingInterceptor.Level.BASIC);
+
+    public static <S> S createService(Class<S> serviceClass) {
+        if (!httpClient.interceptors().contains(logging)) {
+            httpClient.addInterceptor(logging);
+            builder.client(httpClient.build());
+            retrofit = builder.build();
+        }
+        return retrofit.create(serviceClass);
+    }
+
+    public static <S> S createService(Class<S> serviceClass, final String token) {
+        if (token != null) {
+            httpClient.interceptors().clear();
+            httpClient.addInterceptor(new Interceptor() {
+                @Override
+                public Response intercept(Interceptor.Chain chain) throws IOException {
+                    Request original = chain.request();
+                    Request.Builder builder = original.newBuilder().header("Authorization", token);
+                    Request request = builder.build();
+                    return chain.proceed(request);
+                }
+            });
+            builder.client(httpClient.build());
+            retrofit = builder.build();
+        }
+        return retrofit.create(serviceClass);
+    }
+
+}