Added Feign Support

app/build.gradle

@@ -24,6 +24,11 @@ android {
     lintOptions {
         abortOnError false
     }
+
+    compileOptions {
+        sourceCompatibility 1.8
+        targetCompatibility 1.8
+    }
 }
 
 sourceSets {
@@ -62,6 +67,8 @@ dependencies {
     implementation "com.squareup.retrofit2:adapter-rxjava2:$retrofitVersion"
     implementation "com.squareup.retrofit2:converter-gson:$retrofitVersion"
 
+    //implementation 'io.github.openfeign:feign-core:10.2.3'
+
     implementation 'com.squareup.okhttp3:logging-interceptor:3.12.1'
 
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"

generator/build.gradle

@@ -49,7 +49,9 @@ dependencies {
 
     compile 'com.squareup:kotlinpoet:1.3.0'
     compile "io.reactivex.rxjava2:rxjava:2.2.10"
-    compile 'com.squareup.retrofit2:retrofit:2.6.0'
+
+    compileOnly 'com.squareup.retrofit2:retrofit:2.6.0'
+    compileOnly 'io.github.openfeign:feign-core:10.2.3'
 
     def jacksonVersion = '2.8.4'
     compile "com.fasterxml.jackson.core:jackson-core:$jacksonVersion"

generator/src/main/java/com/schibsted/spain/retroswagger/RetroswaggerGenerator.kt

@@ -2,8 +2,9 @@ package com.schibsted.spain.retroswagger
 
 import com.google.auto.service.AutoService
 import com.schibsted.spain.retroswagger.annotation.Retroswagger
+import com.schibsted.spain.retroswagger.lib.FeignApiBuilder
 import com.schibsted.spain.retroswagger.lib.RetroswaggerErrorTracking
-import com.schibsted.spain.retroswagger.lib.RetroswaggerApiBuilder
+import com.schibsted.spain.retroswagger.lib.RetrofitApiBuilder
 import com.schibsted.spain.retroswagger.lib.RetroswaggerApiConfiguration
 import com.squareup.kotlinpoet.FileSpec
 import com.squareup.kotlinpoet.TypeSpec
@@ -150,7 +151,33 @@ class RetroswaggerGenerator : AbstractProcessor() {
             overrideInterfaceSlash
         )
 
-        val kotlinApiBuilder = RetroswaggerApiBuilder(
+        val isRetrofitAvailable = try {
+            Class.forName("retrofit2.Retrofit")
+            true
+        } catch (exception: ClassNotFoundException) {
+            false
+        }
+
+        val isFeignAvailable = try {
+            Class.forName("feign.Param")
+            true
+        } catch (exception: ClassNotFoundException) {
+            false
+        }
+
+        if (isRetrofitAvailable) {
+            generateRetrofitCode(configuration, className, pack)
+        } else if (isFeignAvailable) {
+            generateFeignCode(configuration, className, pack)
+        }
+    }
+
+    private fun generateRetrofitCode(
+        configuration: RetroswaggerApiConfiguration,
+        className: String,
+        pack: String
+    ) {
+        val kotlinApiBuilder = RetrofitApiBuilder(
             configuration,
             DummyRetroswaggerErrorTracking()
         )
@@ -165,6 +192,27 @@ class RetroswaggerGenerator : AbstractProcessor() {
         }
     }
 
+    private fun generateFeignCode(
+        configuration: RetroswaggerApiConfiguration,
+        className: String,
+        pack: String
+    ) {
+        val feignApiBuilder = FeignApiBuilder(
+            configuration,
+            DummyRetroswaggerErrorTracking()
+        )
+        feignApiBuilder.build()
+
+        generateClass(className, pack, feignApiBuilder.getGeneratedApiInterfaceTypeSpec())
+        for (typeSpec in feignApiBuilder.getGeneratedModelListTypeSpec()) {
+            generateClass(className, pack, typeSpec)
+        }
+        for (typeSpec in feignApiBuilder.getGeneratedEnumListTypeSpec()) {
+            generateClass(className, pack, typeSpec)
+        }
+    }
+
+
     private fun generateClass(
         className: String,
         pack: String,