Workaround for Name Too Long violations with responseBased code generation

intellij-plugin/src/main/kotlin/com/apollographql/ijplugin/telemetry/TelemetryService.kt

@@ -246,6 +246,7 @@ private fun ApolloGradleToolingModel.toTelemetryProperties(): Set<TelemetryPrope
       it.jsExport?.let { add(ApolloJsExport(it)) }
       it.addTypename?.let { add(ApolloAddTypename(it)) }
       it.flattenModels?.let { add(ApolloFlattenModels(it)) }
+      it.flattenModelsExplicitly?.let { add(TelemetryProperty.ApolloFlattenModelsExplicitly(it)) }
       it.fieldsOnDisjointTypesMustMerge?.let { add(ApolloFieldsOnDisjointTypesMustMerge(it)) }
       it.generateApolloMetadata?.let { add(ApolloGenerateApolloMetadata(it)) }
       add(ApolloUsedOptions(it.usedOptions.toList()))

intellij-plugin/src/main/kotlin/com/apollographql/ijplugin/telemetry/TelemetrySession.kt

@@ -188,6 +188,11 @@ sealed class TelemetryProperty(
    */
   class ApolloFlattenModels(flattenModels: Boolean) : TelemetryProperty("ak_flatten_models", flattenModels)
 
+  /**
+   * Value of the Apollo Kotlin option `flattenModelsExplicitly` if set.
+   */
+  class ApolloFlattenModelsExplicitly(flattenModelsExplicitly: String) : TelemetryProperty("ak_flatten_models_explicitly", flattenModelsExplicitly)
+
   /**
    * Value of the Apollo Kotlin option `fieldsOnDisjointTypesMustMerge` if set.
    */

libraries/apollo-compiler/api/apollo-compiler.api

@@ -187,6 +187,7 @@ public final class com/apollographql/apollo3/compiler/OptionsKt {
 	public static final field defaultFailOnWarnings Z
 	public static final field defaultFieldsOnDisjointTypesMustMerge Z
 	public static final field defaultFlattenModels Z
+	public static final field defaultFlattenModelsExplicitly Ljava/lang/String;
 	public static final field defaultGenerateAsInternal Z
 	public static final field defaultGenerateDataBuilders Z
 	public static final field defaultGenerateFilterNotNull Z
@@ -397,6 +398,29 @@ public final class com/apollographql/apollo3/compiler/codegen/java/adapter/Adapt
 	public static synthetic fun singletonAdapterInitializer$default (Lcom/squareup/javapoet/TypeName;Lcom/squareup/javapoet/TypeName;ZILjava/lang/Object;)Lcom/squareup/javapoet/CodeBlock;
 }
 
+public final class com/apollographql/apollo3/compiler/codegen/kotlin/experimental/ExplicitlyRemovedNode$Companion {
+	public final fun buildTree (Ljava/util/List;)Lcom/apollographql/apollo3/compiler/codegen/kotlin/experimental/ExplicitlyRemovedNode;
+}
+
+public final class com/apollographql/apollo3/compiler/codegen/kotlin/experimental/ExplicitlyRemovedSubClasses$$serializer : kotlinx/serialization/internal/GeneratedSerializer {
+	public static final field INSTANCE Lcom/apollographql/apollo3/compiler/codegen/kotlin/experimental/ExplicitlyRemovedSubClasses$$serializer;
+	public fun childSerializers ()[Lkotlinx/serialization/KSerializer;
+	public fun deserialize (Lkotlinx/serialization/encoding/Decoder;)Lcom/apollographql/apollo3/compiler/codegen/kotlin/experimental/ExplicitlyRemovedSubClasses;
+	public synthetic fun deserialize (Lkotlinx/serialization/encoding/Decoder;)Ljava/lang/Object;
+	public fun getDescriptor ()Lkotlinx/serialization/descriptors/SerialDescriptor;
+	public fun serialize (Lkotlinx/serialization/encoding/Encoder;Lcom/apollographql/apollo3/compiler/codegen/kotlin/experimental/ExplicitlyRemovedSubClasses;)V
+	public synthetic fun serialize (Lkotlinx/serialization/encoding/Encoder;Ljava/lang/Object;)V
+	public fun typeParametersSerializers ()[Lkotlinx/serialization/KSerializer;
+}
+
+public final class com/apollographql/apollo3/compiler/codegen/kotlin/experimental/ExplicitlyRemovedSubClasses$Companion {
+	public final fun serializer ()Lkotlinx/serialization/KSerializer;
+}
+
+public final class com/apollographql/apollo3/compiler/codegen/kotlin/experimental/ExplicitlyRemovedSubClassesKt {
+	public static final fun buildFileFromUserDir (Ljava/lang/String;)Ljava/io/File;
+}
+
 public final class com/apollographql/apollo3/compiler/ir/IrCatchTo : java/lang/Enum {
 	public static final field Companion Lcom/apollographql/apollo3/compiler/ir/IrCatchTo$Companion;
 	public static final field NoCatch Lcom/apollographql/apollo3/compiler/ir/IrCatchTo;

libraries/apollo-compiler/src/main/kotlin/com/apollographql/apollo3/compiler/ApolloCompiler.kt

@@ -243,6 +243,7 @@ object ApolloCompiler {
         codegenModels = codegenModels,
         generateOptionalOperationVariables = options.generateOptionalOperationVariables,
         flattenModels = options.flattenModels,
+        flattenModelsExplicitly = options.flattenModelsExplicitly,
         decapitalizeFields = options.decapitalizeFields,
         alwaysGenerateTypesMatching = options.alwaysGenerateTypesMatching,
         generateDataBuilders = options.codegenSchema.generateDataBuilders,
@@ -363,6 +364,11 @@ object ApolloCompiler {
           "enclosing one.")
     }
 
+    if (ir.flattenModelsExplicitly != "") {
+      error("Java codegen does not support flattening nested models explicitly as it could trigger name clashes when a nested class has " +
+          "the same name as an enclosing one.")
+    }
+
     return CodegenMetadata(
         JavaCodeGen(
             commonCodegenOptions = commonCodegenOptions,
@@ -412,6 +418,7 @@ object ApolloCompiler {
       failOnWarnings: Boolean = defaultFailOnWarnings,
       logger: Logger = defaultLogger,
       flattenModels: Boolean = defaultFlattenModels,
+      flattenModelsExplicitly: String = defaultFlattenModelsExplicitly,
       codegenModels: String = defaultCodegenModels,
       addTypename: String = defaultAddTypename,
       decapitalizeFields: Boolean = defaultDecapitalizeFields,
@@ -469,6 +476,7 @@ object ApolloCompiler {
         failOnWarnings = failOnWarnings,
         logger = logger,
         flattenModels = flattenModels,
+        flattenModelsExplicitly = flattenModelsExplicitly,
         incomingFragments = emptyList(),
         addTypename = addTypename,
         decapitalizeFields = decapitalizeFields,

libraries/apollo-compiler/src/main/kotlin/com/apollographql/apollo3/compiler/Options.kt

@@ -183,6 +183,8 @@ class IrOptions(
 
     val flattenModels: Boolean,
 
+    val flattenModelsExplicitly: String,
+
     val warnOnDeprecatedUsages: Boolean,
     val failOnWarnings: Boolean,
     val logger: ApolloCompiler.Logger,
@@ -431,6 +433,7 @@ const val defaultCodegenModels = MODELS_OPERATION_BASED
 const val defaultAddTypename = ADD_TYPENAME_IF_FRAGMENTS
 const val defaultRequiresOptInAnnotation = "none"
 const val defaultFlattenModels = true
+const val defaultFlattenModelsExplicitly = ""
 val defaultTargetLanguage = TargetLanguage.KOTLIN_1_5
 const val defaultGenerateSchema = false
 const val defaultGeneratedSchemaName = "__Schema"