| /* |
| * Copyright (C) 2019 The Dagger Authors. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package dagger.hilt.processor.internal; |
| |
| import com.google.auto.common.MoreElements; |
| import com.google.auto.value.AutoValue; |
| import com.google.common.base.Throwables; |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.Optional; |
| import javax.annotation.processing.Messager; |
| import javax.annotation.processing.ProcessingEnvironment; |
| import javax.lang.model.element.Element; |
| import javax.lang.model.util.Elements; |
| import javax.tools.Diagnostic.Kind; |
| |
| /** Utility class to handle keeping track of errors during processing. */ |
| final class ProcessorErrorHandler { |
| |
| private static final String FAILURE_PREFIX = "[Hilt]\n"; |
| |
| // Special characters to make the tag red and bold to draw attention since |
| // this error can get drowned out by other errors resulting from missing |
| // symbols when we can't generate code. |
| private static final String FAILURE_SUFFIX = |
| "\n\033[1;31m[Hilt] Processing did not complete. See error above for details.\033[0m"; |
| |
| private final Messager messager; |
| private final Elements elements; |
| private final List<HiltError> hiltErrors; |
| |
| ProcessorErrorHandler(ProcessingEnvironment env) { |
| this.messager = env.getMessager(); |
| this.elements = env.getElementUtils(); |
| this.hiltErrors = new ArrayList<>(); |
| } |
| |
| /** |
| * Records an error message for some exception to the messager. This can be used to handle |
| * exceptions gracefully that would otherwise be propagated out of the {@code process} method. The |
| * message is stored in order to allow the build to continue as far as it can. The build will be |
| * failed with a {@link Kind#ERROR} in {@link #checkErrors} if an error was recorded with this |
| * method. |
| */ |
| void recordError(Throwable t) { |
| // Store messages to allow the build to continue as far as it can. The build will |
| // be failed in checkErrors when processing is over. |
| |
| if (t instanceof BadInputException) { |
| BadInputException badInput = (BadInputException) t; |
| for (Element element : badInput.getBadElements()) { |
| hiltErrors.add(HiltError.of(badInput.getMessage(), element)); |
| } |
| } else if (t instanceof ErrorTypeException) { |
| ErrorTypeException badInput = (ErrorTypeException) t; |
| hiltErrors.add(HiltError.of(badInput.getMessage(), badInput.getBadElement())); |
| } else if (t.getMessage() != null) { |
| hiltErrors.add(HiltError.of(t.getMessage() + ": " + Throwables.getStackTraceAsString(t))); |
| } else { |
| hiltErrors.add(HiltError.of(t.getClass() + ": " + Throwables.getStackTraceAsString(t))); |
| } |
| } |
| |
| /** Checks for any recorded errors. This should be called at the end of process every round. */ |
| void checkErrors() { |
| if (!hiltErrors.isEmpty()) { |
| hiltErrors.forEach( |
| hiltError -> { |
| if (hiltError.element().isPresent()) { |
| Element element = hiltError.element().get(); |
| if (MoreElements.isType(element)) { |
| // If the error type is a TypeElement, get a new one just in case it was thrown in a |
| // previous round we can report the correct instance. Otherwise, this leads to |
| // issues in AndroidStudio when linking an error to the proper element. |
| // TODO(bcorso): Consider only allowing TypeElement errors when delaying errors, |
| // or maybe even removing delayed errors altogether. |
| element = |
| elements.getTypeElement( |
| MoreElements.asType(element).getQualifiedName().toString()); |
| } |
| messager.printMessage(Kind.ERROR, hiltError.message(), element); |
| } else { |
| messager.printMessage(Kind.ERROR, hiltError.message()); |
| } |
| }); |
| hiltErrors.clear(); |
| } |
| } |
| |
| @AutoValue |
| abstract static class HiltError { |
| static HiltError of(String message) { |
| return of(message, Optional.empty()); |
| } |
| |
| static HiltError of(String message, Element element) { |
| return of(message, Optional.of(element)); |
| } |
| |
| private static HiltError of(String message, Optional<Element> element) { |
| return new AutoValue_ProcessorErrorHandler_HiltError( |
| FAILURE_PREFIX + message + FAILURE_SUFFIX, element); |
| } |
| |
| abstract String message(); |
| |
| abstract Optional<Element> element(); |
| } |
| } |