/// <summary>
/// Determines whether a category exists.
/// </summary>
/// <param name="category">The category to check.</param>
/// <returns><c>true</c> if the category exists, <c>false</c> otherwise.</returns>
private bool CategoryExists(CategoryInfo category)
{
lock(this) {
CategoryInfo[] cats = GetCategories(FindNamespace(NameTools.GetNamespace(category.FullName), GetNamespaces()));
CategoryNameComparer comp = new CategoryNameComparer();
for(int i = 0; i < cats.Length; i++) {
if(comp.Compare(cats[i], category) == 0) return true;
}
}
return false;
}
/// <summary>
/// Renames a Category.
/// </summary>
/// <param name="category">The Category to rename.</param>
/// <param name="newName">The new Name.</param>
/// <returns>The correct CategoryInfo object.</returns>
/// <exception cref="ArgumentNullException">If <paramref name="category"/> or <paramref name="newName"/> are <c>null</c>.</exception>
/// <exception cref="ArgumentException">If <paramref name="newName"/> is empty.</exception>
public CategoryInfo RenameCategory(CategoryInfo category, string newName)
{
if(category == null) throw new ArgumentNullException("category");
if(newName == null) throw new ArgumentNullException("newName");
if(newName.Length == 0) throw new ArgumentException("New Name cannot be empty", "newName");
lock(this) {
CategoryInfo result = new CategoryInfo(NameTools.GetFullName(NameTools.GetNamespace(category.FullName), newName), this);
if(CategoryExists(result)) return null;
CategoryInfo[] cats = GetAllCategories();
CategoryNameComparer comp = new CategoryNameComparer();
for(int i = 0; i < cats.Length; i++) {
if(comp.Compare(cats[i], category) == 0) {
result.Pages = cats[i].Pages;
cats[i] = result;
DumpCategories(cats);
categoriesCache = null;
return result;
}
}
}
return null;
}
/// <summary>
/// Binds a Page with one or more Categories.
/// </summary>
/// <param name="page">The Page to bind.</param>
/// <param name="categories">The Categories to bind the Page with (full name).</param>
/// <returns>True if the binding succeeded.</returns>
/// <remarks>After a successful operation, the Page is bound with all and only the categories passed as argument.</remarks>
/// <exception cref="ArgumentNullException">If <paramref name="page"/> or <paramref name="categories"/> are <c>null</c>.</exception>
public bool RebindPage(PageInfo page, string[] categories)
{
if(page == null) throw new ArgumentNullException("page");
if(categories == null) throw new ArgumentNullException("categories");
lock(this) {
if(!PageExists(page)) return false;
CategoryInfo[] cats = GetAllCategories();
// Check all categories (they all must exist and be valid)
foreach(string cat in categories) {
if(cat == null) throw new ArgumentNullException("categories", "A category name cannot be null");
if(cat.Length == 0) throw new ArgumentException("A category name cannot be empty", "categories");
CategoryNameComparer comp = new CategoryNameComparer();
if(Array.Find<CategoryInfo>(cats, delegate(CategoryInfo x) {
return comp.Compare(x, new CategoryInfo(cat, this)) == 0;
}) == null) return false;
}
// Operations:
// - Remove the Page from every Category
// - For each specified category, add (if needed) the Page
List<string> pages;
CategoryNameComparer catComp = new CategoryNameComparer();
for(int i = 0; i < cats.Length; i++) {
pages = new List<string>(cats[i].Pages);
int idx = GetIndex(pages, page.FullName);
if(idx != -1) pages.Remove(pages[idx]);
cats[i].Pages = pages.ToArray();
}
for(int i = 0; i < cats.Length; i++) {
for(int k = 0; k < categories.Length; k++) {
if(catComp.Compare(cats[i], new CategoryInfo(categories[k], this)) == 0) {
pages = new List<string>(cats[i].Pages);
pages.Add(page.FullName);
cats[i].Pages = pages.ToArray();
}
}
}
DumpCategories(cats);
pagesCache = null;
categoriesCache = null;
}
return true;
}
/// <summary>
/// Removes a Category.
/// </summary>
/// <param name="category">The Category to remove.</param>
/// <returns>True if the Category has been removed successfully.</returns>
/// <exception cref="ArgumentNullException">If <paramref name="category"/> is <c>null</c>.</exception>
public bool RemoveCategory(CategoryInfo category)
{
if(category == null) throw new ArgumentNullException("category");
lock(this) {
CategoryInfo[] cats = GetAllCategories();
CategoryNameComparer comp = new CategoryNameComparer();
for(int i = 0; i < cats.Length; i++) {
if(comp.Compare(cats[i], category) == 0) {
List<CategoryInfo> tmp = new List<CategoryInfo>(cats);
tmp.Remove(tmp[i]);
DumpCategories(tmp.ToArray());
categoriesCache = null;
return true;
}
}
}
return false;
}
/// <summary>
/// Merges two Categories.
/// </summary>
/// <param name="source">The source Category.</param>
/// <param name="destination">The destination Category.</param>
/// <returns>True if the Categories have been merged successfully.</returns>
/// <remarks>The destination Category remains, while the source Category is deleted, and all its Pages re-bound in the destination Category.</remarks>
/// <exception cref="ArgumentNullException">If <paramref name="source"/> or <paramref name="destination"/> are <c>null</c>.</exception>
public CategoryInfo MergeCategories(CategoryInfo source, CategoryInfo destination)
{
if(source == null) throw new ArgumentNullException("source");
if(destination == null) throw new ArgumentNullException("destination");
lock(this) {
NamespaceInfo[] allNamespaces = GetNamespaces();
NamespaceInfo sourceNs = FindNamespace(NameTools.GetNamespace(source.FullName), allNamespaces);
NamespaceInfo destinationNs = FindNamespace(NameTools.GetNamespace(destination.FullName), allNamespaces);
NamespaceComparer nsComp = new NamespaceComparer();
if(!(sourceNs == null && destinationNs == null) && nsComp.Compare(sourceNs, destinationNs) != 0) {
// Different namespaces
return null;
}
CategoryInfo[] cats = GetAllCategories();
int idxSource = -1, idxDest = -1;
CategoryNameComparer comp = new CategoryNameComparer();
for(int i = 0; i < cats.Length; i++) {
if(comp.Compare(cats[i], source) == 0) idxSource = i;
if(comp.Compare(cats[i], destination) == 0) idxDest = i;
if(idxSource != -1 && idxDest != -1) break;
}
if(idxSource == -1 || idxDest == -1) return null;
List<CategoryInfo> tmp = new List<CategoryInfo>(cats);
List<string> newPages = new List<string>(cats[idxDest].Pages);
for(int i = 0; i < cats[idxSource].Pages.Length; i++) {
bool found = false;
for(int k = 0; k < newPages.Count; k++) {
if(StringComparer.OrdinalIgnoreCase.Compare(newPages[k], cats[idxSource].Pages[i]) == 0) {
found = true;
break;
}
}
if(!found) {
newPages.Add(cats[idxSource].Pages[i]);
}
}
tmp[idxDest].Pages = newPages.ToArray();
tmp.Remove(tmp[idxSource]);
DumpCategories(tmp.ToArray());
CategoryInfo newCat = new CategoryInfo(destination.FullName, this);
newCat.Pages = newPages.ToArray();
categoriesCache = null;
return newCat;
}
}
