storage/mozStorageBindingParamsArray.h
author Chris H-C <chutten@mozilla.com>
Mon, 04 Jul 2016 11:16:05 -0400
changeset 312997 df28918fe2361f0b54ca9ce4773a29c4c0675d06
parent 279106 fd2b9869729288b7e236410a45b45e80ba4c7ad6
permissions -rw-r--r--
bug 1218576 - Support remote accumulation via JS histograms. r=gfritzsche The JS histograms, too, need to dispatch their accumulations from child to parent. JSHistograms_Add now only supports histograms that are in gHistogramsMap or that were created in the parent process. After bug 1288745, maybe we'll be able to change this to be less convoluted. MozReview-Commit-ID: 3qTH89YKbGP

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 * vim: sw=2 ts=2 et lcs=trail\:.,tab\:>~ :
 * 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 mozStorageBindingParamsArray_h
#define mozStorageBindingParamsArray_h

#include "nsAutoPtr.h"
#include "nsTArray.h"
#include "mozilla/Attributes.h"

#include "mozIStorageBindingParamsArray.h"

namespace mozilla {
namespace storage {

class StorageBaseStatementInternal;

class BindingParamsArray final : public mozIStorageBindingParamsArray
{
  typedef nsTArray< nsCOMPtr<mozIStorageBindingParams> > array_type;

  ~BindingParamsArray() {}

public:
  NS_DECL_THREADSAFE_ISUPPORTS
  NS_DECL_MOZISTORAGEBINDINGPARAMSARRAY

  explicit BindingParamsArray(StorageBaseStatementInternal *aOwningStatement);

  typedef array_type::size_type size_type;

  /**
   * Locks the array and prevents further modification to it (such as adding
   * more elements to it).
   */
  void lock();

  /**
   * @return the pointer to the owning BindingParamsArray.
   */
  const StorageBaseStatementInternal *getOwner() const;

  /**
   * @return the number of elemets the array contains.
   */
  size_type length() const { return mArray.Length(); }

  class iterator {
  public:
    iterator(BindingParamsArray *aArray,
             uint32_t aIndex)
    : mArray(aArray)
    , mIndex(aIndex)
    {
    }

    iterator &operator++(int)
    {
      mIndex++;
      return *this;
    }

    bool operator==(const iterator &aOther) const
    {
      return mIndex == aOther.mIndex;
    }
    bool operator!=(const iterator &aOther) const
    {
      return !(*this == aOther);
    }
    mozIStorageBindingParams *operator*()
    {
      NS_ASSERTION(mIndex < mArray->length(),
                   "Dereferenceing an invalid value!");
      return mArray->mArray[mIndex].get();
    }
  private:
    void operator--() { }
    BindingParamsArray *mArray;
    uint32_t mIndex;
  };

  /**
   * Obtains an iterator pointing to the beginning of the array.
   */
  inline iterator begin()
  {
    NS_ASSERTION(length() != 0,
                 "Obtaining an iterator to the beginning with no elements!");
    return iterator(this, 0);
  }

  /**
   * Obtains an iterator pointing to the end of the array.
   */
  inline iterator end()
  {
    NS_ASSERTION(mLocked,
                 "Obtaining an iterator to the end when we are not locked!");
    return iterator(this, length());
  }
private:
  nsCOMPtr<StorageBaseStatementInternal> mOwningStatement;
  array_type mArray;
  bool mLocked;

  friend class iterator;
};

} // namespace storage
} // namespace mozilla

#endif // mozStorageBindingParamsArray_h