gecko-dev/dom/indexedDB/IDBKeyRange.h

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=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/. */

#ifndef mozilla_dom_indexeddb_idbkeyrange_h__
#define mozilla_dom_indexeddb_idbkeyrange_h__

#include "mozilla/dom/indexedDB/IndexedDatabase.h"
#include "mozilla/dom/indexedDB/Key.h"

#include "nsISupports.h"

#include "mozilla/ErrorResult.h"
#include "nsCycleCollectionParticipant.h"

class mozIStorageStatement;

namespace mozilla {
namespace dom {
class GlobalObject;
} // namespace dom
} // namespace mozilla

BEGIN_INDEXEDDB_NAMESPACE

namespace ipc {
class KeyRange;
} // namespace ipc

class IDBKeyRange MOZ_FINAL : public nsISupports
{
public:
  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(IDBKeyRange)

  static nsresult FromJSVal(JSContext* aCx,
                            JS::Handle<JS::Value> aVal,
                            IDBKeyRange** aKeyRange);

  template <class T>
  static already_AddRefed<IDBKeyRange>
  FromSerializedKeyRange(const T& aKeyRange);

  const Key& Lower() const
  {
    return mLower;
  }

  Key& Lower()
  {
    return mLower;
  }

  const Key& Upper() const
  {
    return mIsOnly ? mLower : mUpper;
  }

  Key& Upper()
  {
    return mIsOnly ? mLower : mUpper;
  }

  // TODO: Remove these in favour of LowerOpen() / UpperOpen(), bug 900578.
  bool IsLowerOpen() const
  {
    return mLowerOpen;
  }

  bool IsUpperOpen() const
  {
    return mUpperOpen;
  }

  bool IsOnly() const
  {
    return mIsOnly;
  }

  void GetBindingClause(const nsACString& aKeyColumnName,
                        nsACString& _retval) const
  {
    NS_NAMED_LITERAL_CSTRING(andStr, " AND ");
    NS_NAMED_LITERAL_CSTRING(spacecolon, " :");
    NS_NAMED_LITERAL_CSTRING(lowerKey, "lower_key");

    if (IsOnly()) {
      // Both keys are set and they're equal.
      _retval = andStr + aKeyColumnName + NS_LITERAL_CSTRING(" =") +
                spacecolon + lowerKey;
    }
    else {
      nsAutoCString clause;

      if (!Lower().IsUnset()) {
        // Lower key is set.
        clause.Append(andStr + aKeyColumnName);
        clause.AppendLiteral(" >");
        if (!IsLowerOpen()) {
          clause.AppendLiteral("=");
        }
        clause.Append(spacecolon + lowerKey);
      }

      if (!Upper().IsUnset()) {
        // Upper key is set.
        clause.Append(andStr + aKeyColumnName);
        clause.AppendLiteral(" <");
        if (!IsUpperOpen()) {
          clause.AppendLiteral("=");
        }
        clause.Append(spacecolon + NS_LITERAL_CSTRING("upper_key"));
      }

      _retval = clause;
    }
  }

  nsresult BindToStatement(mozIStorageStatement* aStatement) const
  {
    NS_NAMED_LITERAL_CSTRING(lowerKey, "lower_key");

    if (IsOnly()) {
      return Lower().BindToStatement(aStatement, lowerKey);
    }

    nsresult rv;

    if (!Lower().IsUnset()) {
      rv = Lower().BindToStatement(aStatement, lowerKey);
      NS_ENSURE_SUCCESS(rv, NS_ERROR_DOM_INDEXEDDB_UNKNOWN_ERR);
    }

    if (!Upper().IsUnset()) {
      rv = Upper().BindToStatement(aStatement, NS_LITERAL_CSTRING("upper_key"));
      NS_ENSURE_SUCCESS(rv, NS_ERROR_DOM_INDEXEDDB_UNKNOWN_ERR);
    }

    return NS_OK;
  }

  template <class T>
  void ToSerializedKeyRange(T& aKeyRange);

  void DropJSObjects();

  // WebIDL
  JSObject*
  WrapObject(JSContext* aCx);

  nsISupports*
  GetParentObject() const
  {
    return mGlobal;
  }

  JS::Value
  GetLower(JSContext* aCx, ErrorResult& aRv);

  JS::Value
  GetUpper(JSContext* aCx, ErrorResult& aRv);

  bool
  LowerOpen() const
  {
    return mLowerOpen;
  }

  bool
  UpperOpen() const
  {
    return mUpperOpen;
  }

  static already_AddRefed<IDBKeyRange>
  Only(const GlobalObject& aGlobal, JSContext* aCx,
       JS::Handle<JS::Value> aValue, ErrorResult& aRv);

  static already_AddRefed<IDBKeyRange>
  LowerBound(const GlobalObject& aGlobal, JSContext* aCx,
             JS::Handle<JS::Value> aValue, bool aOpen, ErrorResult& aRv);

  static already_AddRefed<IDBKeyRange>
  UpperBound(const GlobalObject& aGlobal, JSContext* aCx,
             JS::Handle<JS::Value> aValue, bool aOpen, ErrorResult& aRv);

  static already_AddRefed<IDBKeyRange>
  Bound(const GlobalObject& aGlobal, JSContext* aCx,
        JS::Handle<JS::Value> aLower, JS::Handle<JS::Value> aUpper,
        bool aLowerOpen, bool aUpperOpen, ErrorResult& aRv);

private:
  IDBKeyRange(nsISupports* aGlobal,
              bool aLowerOpen,
              bool aUpperOpen,
              bool aIsOnly)
  : mGlobal(aGlobal), mCachedLowerVal(JSVAL_VOID), mCachedUpperVal(JSVAL_VOID),
    mLowerOpen(aLowerOpen), mUpperOpen(aUpperOpen), mIsOnly(aIsOnly),
    mHaveCachedLowerVal(false), mHaveCachedUpperVal(false), mRooted(false)
  { }

  ~IDBKeyRange();

  nsCOMPtr<nsISupports> mGlobal;
  Key mLower;
  Key mUpper;
  JS::Heap<JS::Value> mCachedLowerVal;
  JS::Heap<JS::Value> mCachedUpperVal;
  const bool mLowerOpen;
  const bool mUpperOpen;
  const bool mIsOnly;
  bool mHaveCachedLowerVal;
  bool mHaveCachedUpperVal;
  bool mRooted;
};

END_INDEXEDDB_NAMESPACE

#endif // mozilla_dom_indexeddb_idbkeyrange_h__