gecko-dev/xpcom/ds/nsCheapSets.cpp

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Mozilla Communicator client code.
 *
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 * Contributor(s):
 *
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#include "nsCheapSets.h"

nsCheapStringSet::~nsCheapStringSet()
{
  nsStringHashSet* set = GetHash();
  if (set) {
    delete set;
  } else {
    delete GetStr();
  }
}

/**
 * Put a string into the table
 */
nsresult
nsCheapStringSet::Put(const nsAString& aVal)
{
  // Add the value to the hash if it is there
  nsStringHashSet* set = GetHash();
  if (set) {
    return set->Put(aVal);
  }

  // If a string is already there, create a hashtable and both of these to it
  if (GetStr()) {
    nsAString* oldStr = GetStr();
    nsresult rv = InitHash(&set);
    NS_ENSURE_SUCCESS(rv, rv);

    rv = set->Put(*oldStr);
    delete oldStr;
    NS_ENSURE_SUCCESS(rv, rv);

    return set->Put(aVal);
  }

  // Nothing exists in the hash right now, so just set the single string
  return SetStr(aVal);
}

void
nsCheapStringSet::Remove(const nsAString& aVal)
{
  // Remove from the hash if the hash is there
  nsStringHashSet* set = GetHash();
  if (set) {
    set->Remove(aVal);
    return;
  }

  // Remove the string if there is just a string
  nsAString* str = GetStr();
  if (str && str->Equals(aVal)) {
    delete str;
    mValOrHash = nsnull;
  }
}

nsresult
nsCheapStringSet::InitHash(nsStringHashSet** aSet)
{
  nsStringHashSet* newSet = new nsStringHashSet();
  if (!newSet) {
    return NS_ERROR_OUT_OF_MEMORY;
  }

  nsresult rv = newSet->Init(10);
  NS_ENSURE_SUCCESS(rv, rv);

  mValOrHash = newSet;
  *aSet = newSet;
  return NS_OK;
}


nsCheapInt32Set::~nsCheapInt32Set()
{
  delete GetHash();
}

nsresult
nsCheapInt32Set::Put(PRInt32 aVal)
{
  // Add the value to the hash or set the pointer as an int
  nsInt32HashSet* set = GetHash();
  if (set) {
    return set->Put(aVal);
  }

  // Create the hash and add the value to it if there is an int already
  if (IsInt()) {
    PRInt32 oldInt = GetInt();

    nsresult rv = InitHash(&set);
    NS_ENSURE_SUCCESS(rv, rv);

    rv = set->Put(oldInt);
    NS_ENSURE_SUCCESS(rv, rv);

    return set->Put(aVal);
  }

  // Create the hash anyway if the int is negative (negative numbers cannot
  // fit into our PtrBits abstraction)
  if (aVal < 0) {
    nsresult rv = InitHash(&set);
    NS_ENSURE_SUCCESS(rv, rv);

    return set->Put(aVal);
  }

  // Finally, just set the int if we can't do anything with hashes
  SetInt(aVal);
  return NS_OK;
}
 
void
nsCheapInt32Set::Remove(PRInt32 aVal)
{
  nsInt32HashSet* set = GetHash();
  if (set) {
    set->Remove(aVal);
  } else if (IsInt() && GetInt() == aVal) {
    mValOrHash = nsnull;
  }
}

nsresult
nsCheapInt32Set::InitHash(nsInt32HashSet** aSet)
{
  nsInt32HashSet* newSet = new nsInt32HashSet();
  if (!newSet) {
    return NS_ERROR_OUT_OF_MEMORY;
  }

  nsresult rv = newSet->Init(10);
  NS_ENSURE_SUCCESS(rv, rv);

  mValOrHash = newSet;
  *aSet = newSet;
  return NS_OK;
}