private void checkDuplicateAttribute(XmlTag tag, final XmlAttribute attribute) {
    if (skipValidation(tag)) {
      return;
    }

    final XmlAttribute[] attributes = tag.getAttributes();
    final PsiFile containingFile = tag.getContainingFile();
    final XmlExtension extension =
        containingFile instanceof XmlFile
            ? XmlExtension.getExtension(containingFile)
            : XmlExtension.DEFAULT_EXTENSION;
    for (XmlAttribute tagAttribute : attributes) {
      ProgressManager.checkCanceled();
      if (attribute != tagAttribute
          && Comparing.strEqual(attribute.getName(), tagAttribute.getName())) {
        final String localName = attribute.getLocalName();

        if (extension.canBeDuplicated(tagAttribute))
          continue; // multiple import attributes are allowed in jsp directive

        HighlightInfo highlightInfo =
            HighlightInfo.createHighlightInfo(
                getTagProblemInfoType(tag),
                XmlChildRole.ATTRIBUTE_NAME_FINDER.findChild(
                    SourceTreeToPsiMap.psiElementToTree(attribute)),
                XmlErrorMessages.message("duplicate.attribute", localName));
        addToResults(highlightInfo);

        IntentionAction intentionAction = new RemoveAttributeIntentionFix(localName, attribute);

        QuickFixAction.registerQuickFixAction(highlightInfo, intentionAction);
      }
    }
  }
 @NotNull
 public Map<String, String> getLocalNamespaceDeclarations() {
   Map<String, String> namespaces = new THashMap<String, String>();
   for (final XmlAttribute attribute : getAttributes()) {
     if (!attribute.isNamespaceDeclaration() || attribute.getValue() == null) continue;
     // xmlns -> "", xmlns:a -> a
     final String localName = attribute.getLocalName();
     namespaces.put(localName.equals(attribute.getName()) ? "" : localName, attribute.getValue());
   }
   return namespaces;
 }
 private static boolean canBeExtracted(@NotNull XmlAttribute attribute) {
   if (!(SdkConstants.NS_RESOURCES.equals(attribute.getNamespace()))) {
     return false;
   }
   final String name = attribute.getLocalName();
   if (ArrayUtil.find(NON_EXTRACTABLE_ATTRIBUTES, name) >= 0) {
     return false;
   }
   if (name.startsWith(AndroidDomUtil.ATTR_STYLE)) {
     return false;
   }
   return true;
 }
  private static void inlineSingleTag(
      XmlTag includeTag, XmlTag includeParentTag, XmlTag layoutRootTag) {
    final Map<String, String> attributesToAdd = new HashMap<String, String>();

    for (XmlAttribute attribute : includeTag.getAttributes()) {
      final String namespace = attribute.getNamespace();

      if (SdkConstants.NS_RESOURCES.equals(namespace)) {
        attributesToAdd.put(attribute.getLocalName(), attribute.getValue());
      }
    }
    final XmlTag newTag = (XmlTag) includeTag.replace(layoutRootTag.copy());
    final List<XmlAttribute> toDelete = new ArrayList<XmlAttribute>();

    for (XmlAttribute attribute : newTag.getAttributes()) {
      if (attribute.isNamespaceDeclaration()) {
        final String localName = attribute.getLocalName();
        final String prefix = localName.equals(attribute.getName()) ? "" : localName;
        final String namespace = attribute.getValue();

        if (includeParentTag != null
            && namespace.equals(includeParentTag.getNamespaceByPrefix(prefix))) {
          toDelete.add(attribute);
        }
      }
    }

    for (XmlAttribute attribute : toDelete) {
      attribute.delete();
    }

    for (Map.Entry<String, String> entry : attributesToAdd.entrySet()) {
      final String localName = entry.getKey();
      final String value = entry.getValue();
      newTag.setAttribute(localName, SdkConstants.NS_RESOURCES, value);
    }
    CodeStyleManager.getInstance(newTag.getManager()).reformat(newTag);
  }