gecko/xpcom/ds/nsProperties.cpp

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* 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/. */

#include "nsProperties.h"

////////////////////////////////////////////////////////////////////////////////

NS_IMPL_AGGREGATED(nsProperties)
NS_INTERFACE_MAP_BEGIN_AGGREGATED(nsProperties)
  NS_INTERFACE_MAP_ENTRY(nsIProperties)
NS_INTERFACE_MAP_END

NS_IMETHODIMP
nsProperties::Get(const char* prop, const nsIID& uuid, void** result)
{
  if (NS_WARN_IF(!prop)) {
    return NS_ERROR_INVALID_ARG;
  }

  nsCOMPtr<nsISupports> value;
  if (!nsProperties_HashBase::Get(prop, getter_AddRefs(value))) {
    return NS_ERROR_FAILURE;
  }
  return (value) ? value->QueryInterface(uuid, result) : NS_ERROR_NO_INTERFACE;
}

NS_IMETHODIMP
nsProperties::Set(const char* prop, nsISupports* value)
{
  if (NS_WARN_IF(!prop)) {
    return NS_ERROR_INVALID_ARG;
  }
  Put(prop, value);
  return NS_OK;
}

NS_IMETHODIMP
nsProperties::Undefine(const char* prop)
{
  if (NS_WARN_IF(!prop)) {
    return NS_ERROR_INVALID_ARG;
  }

  nsCOMPtr<nsISupports> value;
  if (!nsProperties_HashBase::Get(prop, getter_AddRefs(value))) {
    return NS_ERROR_FAILURE;
  }

  Remove(prop);
  return NS_OK;
}

NS_IMETHODIMP
nsProperties::Has(const char* prop, bool* result)
{
  if (NS_WARN_IF(!prop)) {
    return NS_ERROR_INVALID_ARG;
  }

  nsCOMPtr<nsISupports> value;
  *result = nsProperties_HashBase::Get(prop, getter_AddRefs(value));
  return NS_OK;
}

struct GetKeysEnumData
{
  char** keys;
  uint32_t next;
  nsresult res;
};

PLDHashOperator
GetKeysEnumerate(const char* aKey, nsISupports* aData, void* aArg)
{
  GetKeysEnumData* gkedp = (GetKeysEnumData*)aArg;
  gkedp->keys[gkedp->next] = strdup(aKey);

  if (!gkedp->keys[gkedp->next]) {
    gkedp->res = NS_ERROR_OUT_OF_MEMORY;
    return PL_DHASH_STOP;
  }

  gkedp->next++;
  return PL_DHASH_NEXT;
}

NS_IMETHODIMP
nsProperties::GetKeys(uint32_t* aCount, char*** aKeys)
{
  if (NS_WARN_IF(!aCount) || NS_WARN_IF(!aKeys)) {
    return NS_ERROR_INVALID_ARG;
  }

  uint32_t n = Count();
  char** k = (char**)nsMemory::Alloc(n * sizeof(char*));

  GetKeysEnumData gked;
  gked.keys = k;
  gked.next = 0;
  gked.res = NS_OK;

  EnumerateRead(GetKeysEnumerate, &gked);

  nsresult rv = gked.res;
  if (NS_FAILED(rv)) {
    // Free 'em all
    for (uint32_t i = 0; i < gked.next; i++) {
      nsMemory::Free(k[i]);
    }
    nsMemory::Free(k);
    return rv;
  }

  *aCount = n;
  *aKeys = k;
  return NS_OK;
}

////////////////////////////////////////////////////////////////////////////////