@Nonnull
static List<RemovedMapping> readRemovedMappings(@Nonnull Element e) {
  List<Element> children = e.getChildren(ELEMENT_REMOVED_MAPPING);
  if (children.isEmpty()) {
    return Collections.emptyList();
  }

  List<RemovedMapping> result = new ArrayList<>();
  for (Element mapping : children) {
    String ext = mapping.getAttributeValue(AbstractFileType.ATTRIBUTE_EXT);
    FileNameMatcher matcher = ext == null ? FileTypeManager.parseFromString(mapping.getAttributeValue(AbstractFileType.ATTRIBUTE_PATTERN)) : new ExtensionFileNameMatcher(ext);
    boolean approved = Boolean.parseBoolean(mapping.getAttributeValue(ATTRIBUTE_APPROVED));
    String fileTypeName = mapping.getAttributeValue(ATTRIBUTE_TYPE);
    if (fileTypeName == null) continue;

    RemovedMapping removedMapping = new RemovedMapping(matcher, fileTypeName, approved);
    result.add(removedMapping);
  }
  return result;
}
 

private static Element writeRemovedMapping(@Nonnull String fileTypeName, @Nonnull FileNameMatcher matcher, boolean specifyTypeName, boolean approved) {
  Element mapping = new Element(ELEMENT_REMOVED_MAPPING);
  if (matcher instanceof ExtensionFileNameMatcher) {
    mapping.setAttribute(AbstractFileType.ATTRIBUTE_EXT, ((ExtensionFileNameMatcher)matcher).getExtension());
  }
  else if (AbstractFileType.writePattern(matcher, mapping)) {
    return null;
  }
  if (approved) {
    mapping.setAttribute(ATTRIBUTE_APPROVED, "true");
  }
  if (specifyTypeName) {
    mapping.setAttribute(ATTRIBUTE_TYPE, fileTypeName);
  }

  return mapping;
}
 

boolean removeAssociation(@Nonnull FileNameMatcher matcher, @Nonnull T type) {
  if (matcher instanceof ExtensionFileNameMatcher) {
    String extension = ((ExtensionFileNameMatcher)matcher).getExtension();
    if (myExtensionMappings.get(extension) == type) {
      myExtensionMappings.remove(extension);
      return true;
    }
    return false;
  }

  if (matcher instanceof ExactFileNameMatcher) {
    final ExactFileNameMatcher exactFileNameMatcher = (ExactFileNameMatcher)matcher;
    String fileName = exactFileNameMatcher.getFileName();

    final Map<CharSequence, T> mapToUse = exactFileNameMatcher.isIgnoreCase() ? myExactFileNameAnyCaseMappings : myExactFileNameMappings;
    if (mapToUse.get(fileName) == type) {
      mapToUse.remove(fileName);
      return true;
    }
    return false;
  }

  return myMatchingMappings.removeIf(assoc -> matcher.equals(assoc.getFirst()));
}
 

@Nullable
T findAssociatedFileType(@Nonnull FileNameMatcher matcher) {
  if (matcher instanceof ExtensionFileNameMatcher) {
    return findByExtension(((ExtensionFileNameMatcher)matcher).getExtension());
  }

  if (matcher instanceof ExactFileNameMatcher) {
    final ExactFileNameMatcher exactFileNameMatcher = (ExactFileNameMatcher)matcher;

    Map<CharSequence, T> mapToUse = exactFileNameMatcher.isIgnoreCase() ? myExactFileNameAnyCaseMappings : myExactFileNameMappings;
    return mapToUse.get(exactFileNameMatcher.getFileName());
  }

  for (Pair<FileNameMatcher, T> mapping : myMatchingMappings) {
    if (matcher.equals(mapping.getFirst())) return mapping.getSecond();
  }

  return null;
}
 

@NotNull
private List<FileNameMatcher> parse(@Nullable String semicolonDelimited) {
    if (semicolonDelimited == null) {
        return Collections.emptyList();
    }

    StringTokenizer tokenizer = new StringTokenizer(semicolonDelimited, FileTypeConsumer.EXTENSION_DELIMITER, false);
    ArrayList<FileNameMatcher> list = new ArrayList<>();
    while (tokenizer.hasMoreTokens()) {
        list.add(new ExtensionFileNameMatcher(tokenizer.nextToken().trim()));
    }
    return list;
}
 

/** Returns the list of file types recognized as build system files. */
default ImmutableList<FileNameMatcher> buildLanguageFileTypeMatchers() {
  ImmutableList.Builder<FileNameMatcher> list = ImmutableList.builder();
  possibleBuildFileNames().forEach(s -> list.add(new ExactFileNameMatcher(s)));
  possibleWorkspaceFileNames().forEach(s -> list.add(new ExactFileNameMatcher(s)));
  list.add(new ExtensionFileNameMatcher("bzl"));
  return list.build();
}
 

@Override
public void createFileTypes(@NotNull final FileTypeConsumer consumer) {
  FileNameMatcher[] matchers =
      ProjectViewStorageManager.VALID_EXTENSIONS
          .stream()
          .map(ExtensionFileNameMatcher::new)
          .toArray(ExtensionFileNameMatcher[]::new);
  consumer.consume(ProjectViewFileType.INSTANCE, matchers);
}
 

@Override
public void createFileTypes(@NotNull FileTypeConsumer fileTypeConsumer) {
  fileTypeConsumer.consume(
      BcfgFileType.INSTANCE,
      new ExtensionFileNameMatcher(BcfgFileType.DEFAULT_EXTENSION),
      new ExactFileNameMatcher(".buckconfig.local"),
      new ExtensionFileNameMatcher("bcfg"));
}
 

@Override
public void createFileTypes(@NotNull FileTypeConsumer fileTypeConsumer) {
  fileTypeConsumer.consume(
      BuckFileType.INSTANCE,
      new ExactFileNameMatcher(BuckFileType.DEFAULT_FILENAME),
      new ExtensionFileNameMatcher(BuckFileType.DEFAULT_FILENAME),
      new ExtensionFileNameMatcher(BuckFileType.DEFAULT_EXTENSION));
}
 

boolean isAssociatedWith(@Nonnull T type, @Nonnull FileNameMatcher matcher) {
  if (matcher instanceof ExtensionFileNameMatcher || matcher instanceof ExactFileNameMatcher) {
    return findAssociatedFileType(matcher) == type;
  }

  for (Pair<FileNameMatcher, T> mapping : myMatchingMappings) {
    if (matcher.equals(mapping.getFirst()) && type == mapping.getSecond()) return true;
  }

  return false;
}
 

public void addAssociation(@Nonnull FileNameMatcher matcher, @Nonnull T type) {
  if (matcher instanceof ExtensionFileNameMatcher) {
    myExtensionMappings.put(((ExtensionFileNameMatcher)matcher).getExtension(), type);
  }
  else if (matcher instanceof ExactFileNameMatcher) {
    final ExactFileNameMatcher exactFileNameMatcher = (ExactFileNameMatcher)matcher;

    Map<CharSequence, T> mapToUse = exactFileNameMatcher.isIgnoreCase() ? myExactFileNameAnyCaseMappings : myExactFileNameMappings;
    mapToUse.put(exactFileNameMatcher.getFileName(), type);
  }
  else {
    myMatchingMappings.add(Pair.create(matcher, type));
  }
}
 

public void createFileTypes(@NotNull FileTypeConsumer consumer) {
  consumer.consume(
    HaxeFileType.HAXE_FILE_TYPE,
    new ExtensionFileNameMatcher(HaxeFileType.DEFAULT_EXTENSION));
}
 

public void createFileTypes(@NotNull FileTypeConsumer consumer) {
  consumer.consume(
    HXMLFileType.INSTANCE,
    new ExtensionFileNameMatcher(HXMLFileType.DEFAULT_EXTENSION));
}