1 files changed, 171 insertions, 0 deletions
diff --git a/dom/base/Link.h b/dom/base/Link.h
new file mode 100644
index 0000000000..42bbfa791d
--- /dev/null
+++ b/dom/base/Link.h
@@ -0,0 +1,171 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+ * This is the base class for all link classes.
+ */
+
+#ifndef mozilla_dom_Link_h__
+#define mozilla_dom_Link_h__
+
+#include "mozilla/IHistory.h"
+#include "mozilla/MemoryReporting.h"
+#include "nsIContent.h" // for nsLinkState
+
+namespace mozilla {
+
+class EventStates;
+
+namespace dom {
+
+class Element;
+
+#define MOZILLA_DOM_LINK_IMPLEMENTATION_IID               \
+{ 0xb25edee6, 0xdd35, 0x4f8b,                             \
+  { 0xab, 0x90, 0x66, 0xd0, 0xbd, 0x3c, 0x22, 0xd5 } }
+
+class Link : public nsISupports
+{
+public:
+  NS_DECLARE_STATIC_IID_ACCESSOR(MOZILLA_DOM_LINK_IMPLEMENTATION_IID)
+
+  /**
+   * aElement is the element pointer corresponding to this link.
+   */
+  explicit Link(Element* aElement);
+  virtual void SetLinkState(nsLinkState aState);
+
+  /**
+   * @return NS_EVENT_STATE_VISITED if this link is visited,
+   *         NS_EVENT_STATE_UNVISTED if this link is not visited, or 0 if this
+   *         link is not actually a link.
+   */
+  EventStates LinkState() const;
+
+  /**
+   * @return the URI this link is for, if available.
+   */
+  nsIURI* GetURI() const;
+  virtual nsIURI* GetURIExternal() const {
+    return GetURI();
+  }
+
+  /**
+   * Helper methods for modifying and obtaining parts of the URI of the Link.
+   */
+  void SetProtocol(const nsAString &aProtocol);
+  void SetUsername(const nsAString &aUsername);
+  void SetPassword(const nsAString &aPassword);
+  void SetHost(const nsAString &aHost);
+  void SetHostname(const nsAString &aHostname);
+  void SetPathname(const nsAString &aPathname);
+  void SetSearch(const nsAString &aSearch);
+  void SetPort(const nsAString &aPort);
+  void SetHash(const nsAString &aHash);
+  void GetOrigin(nsAString &aOrigin);
+  void GetProtocol(nsAString &_protocol);
+  void GetUsername(nsAString &aUsername);
+  void GetPassword(nsAString &aPassword);
+  void GetHost(nsAString &_host);
+  void GetHostname(nsAString &_hostname);
+  void GetPathname(nsAString &_pathname);
+  void GetSearch(nsAString &_search);
+  void GetPort(nsAString &_port);
+  void GetHash(nsAString &_hash);
+
+  /**
+   * Invalidates any link caching, and resets the state to the default.
+   *
+   * @param aNotify
+   *        true if ResetLinkState should notify the owning document about style
+   *        changes or false if it should not.
+   */
+  void ResetLinkState(bool aNotify, bool aHasHref);
+  
+  // This method nevers returns a null element.
+  Element* GetElement() const { return mElement; }
+
+  /**
+   * DNS prefetch has been deferred until later, e.g. page load complete.
+   */
+  virtual void OnDNSPrefetchDeferred() { /*do nothing*/ }
+  
+  /**
+   * DNS prefetch has been submitted to Host Resolver.
+   */
+  virtual void OnDNSPrefetchRequested() { /*do nothing*/ }
+
+  /**
+   * Checks if DNS Prefetching is ok
+   * 
+   * @returns boolean
+   *          Defaults to true; should be overridden for specialised cases
+   */
+  virtual bool HasDeferredDNSPrefetchRequest() { return true; }
+
+  virtual size_t
+    SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const;
+
+  bool ElementHasHref() const;
+
+  // This is called by HTMLAnchorElement.
+  void TryDNSPrefetch();
+  void CancelDNSPrefetch(nsWrapperCache::FlagsType aDeferredFlag,
+                         nsWrapperCache::FlagsType aRequestedFlag);
+
+  // This is called by HTMLLinkElement.
+  void TryDNSPrefetchPreconnectOrPrefetch();
+  void CancelPrefetch();
+
+protected:
+  virtual ~Link();
+
+  /**
+   * Return true if the link has associated URI.
+   */
+  bool HasURI() const
+  {
+    if (HasCachedURI()) {
+      return true;
+    }
+
+    return !!GetURI();
+  }
+
+  nsIURI* GetCachedURI() const { return mCachedURI; }
+  bool HasCachedURI() const { return !!mCachedURI; }
+
+private:
+  /**
+   * Unregisters from History so this node no longer gets notifications about
+   * changes to visitedness.
+   */
+  void UnregisterFromHistory();
+
+  already_AddRefed<nsIURI> GetURIToMutate();
+  void SetHrefAttribute(nsIURI *aURI);
+
+  mutable nsCOMPtr<nsIURI> mCachedURI;
+
+  Element * const mElement;
+
+  // Strong reference to History.  The link has to unregister before History
+  // can disappear.
+  nsCOMPtr<IHistory> mHistory;
+
+  uint16_t mLinkState;
+
+  bool mNeedsRegistration;
+
+  bool mRegistered;
+};
+
+NS_DEFINE_STATIC_IID_ACCESSOR(Link, MOZILLA_DOM_LINK_IMPLEMENTATION_IID)
+
+} // namespace dom
+} // namespace mozilla
+
+#endif // mozilla_dom_Link_h__