RequestBuilderGenerator.java 文件源码

/**
 * Generates an override of a particular method in {@link com.bumptech.glide.RequestBuilder} that
 * returns {@link com.bumptech.glide.RequestBuilder} so that it returns our generated subclass
 * instead.
 */
private MethodSpec generateRequestBuilderOverride(ExecutableElement methodToOverride) {
  // We've already verified that this method returns a RequestBuilder and RequestBuilders have
  // exactly one type argument, so this is safe unless those assumptions change.
  TypeMirror typeArgument =
      ((DeclaredType) methodToOverride.getReturnType()).getTypeArguments().get(0);

  ParameterizedTypeName generatedRequestBuilderOfType =
      ParameterizedTypeName.get(generatedRequestBuilderClassName, ClassName.get(typeArgument));

  return MethodSpec.overriding(methodToOverride)
      .returns(generatedRequestBuilderOfType)
      .addCode(CodeBlock.builder()
          .add("return ($T) super.$N(",
              generatedRequestBuilderOfType, methodToOverride.getSimpleName())
          .add(FluentIterable.from(methodToOverride.getParameters())
              .transform(new Function<VariableElement, String>() {
                @Override
                public String apply(VariableElement input) {
                  return input.getSimpleName().toString();
                }
              })
              .join(Joiner.on(", ")))
          .add(");\n")
          .build())
      .build();
}