Add @CheckResult to RequestManager methods.

annotation/compiler/src/main/java/com/bumptech/glide/annotation/compiler/RequestManagerGenerator.java

@@ -21,6 +21,7 @@ import java.util.List;
 import java.util.Set;
 import javax.annotation.Nullable;
 import javax.annotation.processing.ProcessingEnvironment;
+import javax.lang.model.element.AnnotationMirror;
 import javax.lang.model.element.ExecutableElement;
 import javax.lang.model.element.Modifier;
 import javax.lang.model.element.TypeElement;
@@ -59,6 +60,8 @@ final class RequestManagerGenerator {
       "com.bumptech.glide.manager.Lifecycle";
   private static final String REQUEST_MANAGER_TREE_NODE_QUALIFIED_NAME =
       "com.bumptech.glide.manager.RequestManagerTreeNode";
+  private static final ClassName CHECK_RESULT_CLASS_NAME =
+      ClassName.get("android.support.annotation", "CheckResult");
 
   private static final String GENERATED_REQUEST_MANAGER_SIMPLE_NAME =
       "GlideRequests";
@@ -147,6 +150,7 @@ final class RequestManagerGenerator {
         .addAnnotation(Override.class)
         .addTypeVariable(TypeVariableName.get("ResourceType"))
         .addParameter(classOfResouceType, "resourceClass")
+        .addAnnotation(AnnotationSpec.builder(CHECK_RESULT_CLASS_NAME).build())
         .returns(requestBuilderOfResourceType)
         .addStatement("return new $T<>(glide, this, resourceClass)",
             this.generatedRequestBuilderClassName)
@@ -160,10 +164,6 @@ final class RequestManagerGenerator {
     TypeMirror rawRequestBuilder = processingEnv.getTypeUtils()
         .erasure(requestBuilderType.asType());
 
-    final TypeElement classType =
-        processingEnv.getElementUtils().getTypeElement(Class.class.getCanonicalName());
-    final TypeMirror rawClassType = processingEnv.getTypeUtils().erasure(classType.asType());
-
     return FluentIterable.from(
         processorUtil.findInstanceMethodsReturning(requestManagerType, rawRequestBuilder))
         .filter(new Predicate<ExecutableElement>() {
@@ -195,7 +195,7 @@ final class RequestManagerGenerator {
     ParameterizedTypeName generatedRequestBuilderOfType =
         ParameterizedTypeName.get(generatedRequestBuilderClassName, ClassName.get(typeArgument));
 
-    return MethodSpec.overriding(methodToOverride)
+    MethodSpec.Builder builder = MethodSpec.overriding(methodToOverride)
         .returns(generatedRequestBuilderOfType)
         .addCode(CodeBlock.builder()
             .add("return ($T) super.$N(",
@@ -209,8 +209,12 @@ final class RequestManagerGenerator {
                 })
                 .join(Joiner.on(", ")))
             .add(");\n")
-            .build())
-        .build();
+            .build());
+
+    for (AnnotationMirror mirror : methodToOverride.getAnnotationMirrors()) {
+      builder.addAnnotation(AnnotationSpec.get(mirror));
+    }
+    return builder.build();
   }
 
   private List<MethodSpec> generateAdditionalRequestManagerMethods(

library/src/main/java/com/bumptech/glide/RequestManager.java

@@ -9,6 +9,7 @@ import android.graphics.Bitmap;
 import android.graphics.drawable.Drawable;
 import android.os.Handler;
 import android.os.Looper;
+import android.support.annotation.CheckResult;
 import android.support.annotation.NonNull;
 import android.support.annotation.Nullable;
 import android.view.View;
@@ -292,6 +293,7 @@ public class RequestManager implements LifecycleListener {
    *
    * @return A new request builder for loading a {@link android.graphics.Bitmap}
    */
+  @CheckResult
   public RequestBuilder<Bitmap> asBitmap() {
     return as(Bitmap.class).apply(DECODE_TYPE_BITMAP);
   }
@@ -309,6 +311,7 @@ public class RequestManager implements LifecycleListener {
    * @return A new request builder for loading a
    * {@link com.bumptech.glide.load.resource.gif.GifDrawable}.
    */
+  @CheckResult
   public RequestBuilder<GifDrawable> asGif() {
     return as(GifDrawable.class).apply(DECODE_TYPE_GIF);
   }
@@ -323,6 +326,7 @@ public class RequestManager implements LifecycleListener {
    *
    * @return A new request builder for loading a {@link Drawable}.
    */
+  @CheckResult
   public RequestBuilder<Drawable> asDrawable() {
     return as(Drawable.class);
   }
@@ -333,6 +337,7 @@ public class RequestManager implements LifecycleListener {
    *
    * @return A new request builder for loading a {@link Drawable} using the given model.
    */
+  @CheckResult
   public RequestBuilder<Drawable> load(@Nullable Object model) {
     return asDrawable().load(model);
   }
@@ -348,6 +353,7 @@ public class RequestManager implements LifecycleListener {
    *
    * @return A new request builder for downloading content to cache and returning the cache File.
    */
+  @CheckResult
   public RequestBuilder<File> downloadOnly() {
     return as(File.class).apply(DOWNLOAD_ONLY_OPTIONS);
   }
@@ -358,6 +364,7 @@ public class RequestManager implements LifecycleListener {
    *
    * @return A new request builder for loading a {@link Drawable} using the given model.
    */
+  @CheckResult
   public RequestBuilder<File> download(@Nullable Object model) {
     return downloadOnly().load(model);
   }
@@ -371,6 +378,7 @@ public class RequestManager implements LifecycleListener {
    *
    * @return A new request builder for obtaining File paths to content.
    */
+  @CheckResult
   public RequestBuilder<File> asFile() {
     return as(File.class).apply(skipMemoryCacheOf(true));
   }
@@ -383,6 +391,7 @@ public class RequestManager implements LifecycleListener {
    * @param resourceClass The resource to decode.
    * @return A new request builder for loading the given resource class.
    */
+  @CheckResult
   public <ResourceType> RequestBuilder<ResourceType> as(Class<ResourceType> resourceClass) {
     return new RequestBuilder<>(glide, this, resourceClass);
   }