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/gecko_api/include/nsClassHashtable.h

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  1/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
  2/* ***** BEGIN LICENSE BLOCK *****
  3 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
  4 *
  5 * The contents of this file are subject to the Mozilla Public License Version
  6 * 1.1 (the "License"); you may not use this file except in compliance with
  7 * the License. You may obtain a copy of the License at
  8 * http://www.mozilla.org/MPL/
  9 *
 10 * Software distributed under the License is distributed on an "AS IS" basis,
 11 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 12 * for the specific language governing rights and limitations under the
 13 * License.
 14 *
 15 * The Original Code is C++ hashtable templates.
 16 *
 17 * The Initial Developer of the Original Code is
 18 * Benjamin Smedberg.
 19 * Portions created by the Initial Developer are Copyright (C) 2002
 20 * the Initial Developer. All Rights Reserved.
 21 *
 22 * Contributor(s):
 23 *
 24 * Alternatively, the contents of this file may be used under the terms of
 25 * either the GNU General Public License Version 2 or later (the "GPL"), or
 26 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 27 * in which case the provisions of the GPL or the LGPL are applicable instead
 28 * of those above. If you wish to allow use of your version of this file only
 29 * under the terms of either the GPL or the LGPL, and not to allow others to
 30 * use your version of this file under the terms of the MPL, indicate your
 31 * decision by deleting the provisions above and replace them with the notice
 32 * and other provisions required by the GPL or the LGPL. If you do not delete
 33 * the provisions above, a recipient may use your version of this file under
 34 * the terms of any one of the MPL, the GPL or the LGPL.
 35 *
 36 * ***** END LICENSE BLOCK ***** */
 37
 38#ifndef nsClassHashtable_h__
 39#define nsClassHashtable_h__
 40
 41#include "nsBaseHashtable.h"
 42#include "nsHashKeys.h"
 43#include "nsAutoPtr.h"
 44
 45/**
 46 * templated hashtable class maps keys to C++ object pointers.
 47 * See nsBaseHashtable for complete declaration.
 48 * @param KeyClass a wrapper-class for the hashtable key, see nsHashKeys.h
 49 *   for a complete specification.
 50 * @param Class the class-type being wrapped
 51 * @see nsInterfaceHashtable, nsClassHashtable
 52 */
 53template<class KeyClass,class T>
 54class nsClassHashtable :
 55  public nsBaseHashtable< KeyClass, nsAutoPtr<T>, T* >
 56{
 57public:
 58  typedef typename KeyClass::KeyType KeyType;
 59  typedef T* UserDataType;
 60
 61  /**
 62   * @copydoc nsBaseHashtable::Get
 63   * @param pData if the key doesn't exist, pData will be set to nsnull.
 64   */
 65  PRBool Get(KeyType aKey, UserDataType* pData) const;
 66};
 67
 68
 69/**
 70 * Thread-safe version of nsClassHashtable
 71 * @param KeyClass a wrapper-class for the hashtable key, see nsHashKeys.h
 72 *   for a complete specification.
 73 * @param Class the class-type being wrapped
 74 * @see nsInterfaceHashtable, nsClassHashtable
 75 */
 76template<class KeyClass,class T>
 77class nsClassHashtableMT :
 78  public nsBaseHashtableMT< KeyClass, nsAutoPtr<T>, T* >
 79{
 80public:
 81  typedef typename KeyClass::KeyType KeyType;
 82  typedef T* UserDataType;
 83
 84  /**
 85   * @copydoc nsBaseHashtable::Get
 86   * @param pData if the key doesn't exist, pData will be set to nsnull.
 87   */
 88  PRBool Get(KeyType aKey, UserDataType* pData) const;
 89};
 90
 91
 92//
 93// nsClassHashtable definitions
 94//
 95
 96template<class KeyClass,class T>
 97PRBool
 98nsClassHashtable<KeyClass,T>::Get(KeyType aKey, T** retVal) const
 99{
100  typename nsBaseHashtable<KeyClass,nsAutoPtr<T>,T*>::EntryType* ent =
101    GetEntry(aKey);
102
103  if (ent)
104  {
105    if (retVal)
106      *retVal = ent->mData;
107
108    return PR_TRUE;
109  }
110
111  if (retVal)
112    *retVal = nsnull;
113
114  return PR_FALSE;
115}
116
117
118//
119// nsClassHashtableMT definitions
120//
121
122template<class KeyClass,class T>
123PRBool
124nsClassHashtableMT<KeyClass,T>::Get(KeyType aKey, T** retVal) const
125{
126  PR_Lock(this->mLock);
127
128  typename nsBaseHashtableMT<KeyClass,nsAutoPtr<T>,T*>::EntryType* ent =
129    GetEntry(aKey);
130
131  if (ent)
132  {
133    if (retVal)
134      *retVal = ent->mData;
135
136    PR_Unlock(this->mLock);
137
138    return PR_TRUE;
139  }
140
141  if (retVal)
142    *retVal = nsnull;
143
144  PR_Unlock(this->mLock);
145
146  return PR_FALSE;
147}
148
149#endif // nsClassHashtable_h__