@Nullable
@Override
public String getElementDescription(PsiElement element, ElementDescriptionLocation location) {
  if (!(element instanceof BuildElement)) {
    return null;
  }
  if (location instanceof UsageViewLongNameLocation) {
    return ((BuildElement) element).getPresentableText();
  }
  if (location instanceof UsageViewShortNameLocation) {
    if (element instanceof PsiNameIdentifierOwner) {
      // this is used by rename operations, so needs to be accurate
      return ((PsiNameIdentifierOwner) element).getName();
    }
    if (element instanceof PsiFile) {
      return ((PsiFile) element).getName();
    }
    return ((BuildElement) element).getPresentableText();
  }
  return null;
}
 

@Override
    @Nullable
    public String getElementDescription(@NotNull PsiElement element, @NotNull ElementDescriptionLocation location) {
        if (!(element instanceof GLSLDeclarator)) return null;
        GLSLDeclarator declarator = (GLSLDeclarator) element;
        GLSLDeclaration declaration = declarator.getParentDeclaration();
        if (declaration == null) return null;

        if (location instanceof UsageViewTypeLocation) {
            return declaration.getDeclarationDescription();
        }

        if (location instanceof UsageViewLongNameLocation) {
            return declaration.getDeclarationDescription() + " '" + declarator.getName() + "'";
        }

        if (location instanceof UsageViewNodeTextLocation) {
            return declarator.getName();
        }
        return null;
//        return location.toString();
    }
 

@Nullable
@Override
public String getElementDescription(@NotNull PsiElement element, @NotNull ElementDescriptionLocation location) {
    if (!element.getLanguage().is(HaskellLanguage.INSTANCE)) return null;
    if (!(element instanceof HaskellNamedElement)) return null;
    return ((HaskellNamedElement) element).getName();
}
 

@Nullable
@Override
@RequiredReadAction
public String getElementDescription(@Nonnull PsiElement element, @Nonnull ElementDescriptionLocation location)
{
	if(location == UsageViewShortNameLocation.INSTANCE && element instanceof CSharpNamedElement)
	{
		return ((CSharpNamedElement) element).getNameWithAt();
	}
	return null;
}
 

@Override
@Nullable
public String getElementDescription(@Nonnull PsiElement element, @Nonnull ElementDescriptionLocation location) {
  if (element instanceof PomTargetPsiElement) {
    return getElementDescription(((PomTargetPsiElement)element).getTarget(), location);
  }
  return null;
}
 

@Override
public ElementDescriptionProvider getDefaultProvider() {
  return new ElementDescriptionProvider() {
    @Override
    public String getElementDescription(@Nonnull PsiElement element, @Nonnull ElementDescriptionLocation location) {
      if (element instanceof PsiPresentableMetaData) {
        return ((PsiPresentableMetaData)element).getTypeName();
      }
      return null;
    }
  };
}
 

@Override
public String getElementDescription(@Nonnull final PsiElement element, @Nonnull final ElementDescriptionLocation location) {
  if (location instanceof UsageViewLongNameLocation) {
    if (element instanceof PsiDirectory) {
      return PsiPackageHelper.getInstance(element.getProject()).getQualifiedName((PsiDirectory)element, true);
    }
    return "";
  }
  return null;
}
 

@Override
public String getElementDescription(@Nonnull final PsiElement element, @Nonnull final ElementDescriptionLocation location) {
  if (!(location instanceof UsageViewShortNameLocation)) return null;

  if (element instanceof PsiMetaOwner) {
    PsiMetaData metaData = ((PsiMetaOwner)element).getMetaData();
    if (metaData!=null) return DescriptiveNameUtil.getMetaDataName(metaData);
  }

  if (element instanceof PsiNamedElement) {
    return ((PsiNamedElement)element).getName();
  }
  return "";
}
 

@Override
public String getElementDescription(@Nonnull PomTarget element, @Nonnull ElementDescriptionLocation location) {
  if (element instanceof PsiElement) return null;

  if (location == UsageViewTypeLocation.INSTANCE) {
    return getTypeName(element);
  }
  if (location == UsageViewNodeTextLocation.INSTANCE) {
    return getTypeName(element) + " " + StringUtil.notNullize(element instanceof PomNamedTarget ? ((PomNamedTarget)element).getName() : null, "''");
  }
  if (location instanceof HighlightUsagesDescriptionLocation) {
    return getTypeName(element);
  }
  return null;
}
 

@Override
public String getElementDescription(@Nonnull final PsiElement element, @Nonnull final ElementDescriptionLocation location) {
  if (location instanceof DeleteNameDescriptionLocation) {
    if (element instanceof PsiNamedElement) {
      return ((PsiNamedElement)element).getName();
    }
  }
  return null;
}
 

@Nullable
public abstract String getElementDescription(@Nonnull PomTarget element, @Nonnull ElementDescriptionLocation location);
 

@Override
public String getElementDescription(@Nonnull final PsiElement element, @Nonnull final ElementDescriptionLocation location) {
  final String typeString = UsageViewUtil.getType(element);
  final String name = DescriptiveNameUtil.getDescriptiveName(element);
  return typeString + " " + CommonRefactoringUtil.htmlEmphasize(name);
}