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474 lines
14 KiB
C++
474 lines
14 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is C++ hashtable templates.
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*
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* The Initial Developer of the Original Code is
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* Benjamin Smedberg.
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* Portions created by the Initial Developer are Copyright (C) 2002
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef nsBaseHashtable_h__
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#define nsBaseHashtable_h__
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#include "nsTHashtable.h"
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#include "prlock.h"
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#include "nsDebug.h"
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template<class KeyClass,class DataType,class UserDataType>
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class nsBaseHashtable; // forward declaration
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/**
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* the private nsTHashtable::EntryType class used by nsBaseHashtable
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* @see nsTHashtable for the specification of this class
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* @see nsBaseHashtable for template parameters
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*/
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template<class KeyClass,class DataType>
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class nsBaseHashtableET : public KeyClass
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{
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public:
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DataType mData;
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friend class nsTHashtable< nsBaseHashtableET<KeyClass,DataType> >;
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private:
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typedef typename KeyClass::KeyType KeyType;
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typedef typename KeyClass::KeyTypePointer KeyTypePointer;
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nsBaseHashtableET(KeyTypePointer aKey);
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nsBaseHashtableET(nsBaseHashtableET<KeyClass,DataType>& toCopy);
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~nsBaseHashtableET();
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};
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/**
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* templated hashtable for simple data types
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* This class manages simple data types that do not need construction or
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* destruction.
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*
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* @param KeyClass a wrapper-class for the hashtable key, see nsHashKeys.h
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* for a complete specification.
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* @param DataType the datatype stored in the hashtable,
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* for example, PRUint32 or nsCOMPtr. If UserDataType is not the same,
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* DataType must implicitly cast to UserDataType
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* @param UserDataType the user sees, for example PRUint32 or nsISupports*
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*/
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template<class KeyClass,class DataType,class UserDataType>
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class nsBaseHashtable :
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protected nsTHashtable< nsBaseHashtableET<KeyClass,DataType> >
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{
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public:
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typedef typename KeyClass::KeyType KeyType;
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typedef nsBaseHashtableET<KeyClass,DataType> EntryType;
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// default constructor+destructor are fine
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/**
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* Initialize the object.
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* @param initSize the initial number of buckets in the hashtable,
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* default 16
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* locking on all class methods
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* @return PR_TRUE if the object was initialized properly.
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*/
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PRBool Init(PRUint32 initSize = PL_DHASH_MIN_SIZE)
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{ return nsTHashtable<EntryType>::Init(initSize); }
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/**
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* Check whether the table has been initialized.
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* This function is especially useful for static hashtables.
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* @return PR_TRUE if the table has been initialized.
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*/
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PRBool IsInitialized() const { return !!this->mTable.entrySize; }
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/**
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* Return the number of entries in the table.
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* @return number of entries
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*/
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PRUint32 Count() const
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{ return nsTHashtable<EntryType>::Count(); }
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/**
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* retrieve the value for a key.
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* @param aKey the key to retreive
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* @param pData data associated with this key will be placed at this
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* pointer. If you only need to check if the key exists, pData
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* may be null.
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* @return PR_TRUE if the key exists. If key does not exist, pData is not
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* modified.
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*/
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PRBool Get(KeyType aKey, UserDataType* pData NS_OUTPARAM) const
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{
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EntryType* ent = GetEntry(aKey);
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if (!ent)
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return PR_FALSE;
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if (pData)
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*pData = ent->mData;
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return PR_TRUE;
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}
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/**
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* For pointer types, get the value, returning NULL if the entry is not
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* present in the table.
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*
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* @param aKey the key to retrieve
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* @return The found value, or NULL if no entry was found with the given key.
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* @note If NULL values are stored in the table, it is not possible to
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* distinguish between a NULL value and a missing entry.
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*/
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UserDataType Get(KeyType aKey) const
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{
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EntryType* ent = GetEntry(aKey);
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if (!ent)
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return NULL;
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return ent->mData;
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}
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/**
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* put a new value for the associated key
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* @param aKey the key to put
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* @param aData the new data
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* @return always PR_TRUE, unless memory allocation failed
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*/
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PRBool Put(KeyType aKey, UserDataType aData)
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{
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EntryType* ent = PutEntry(aKey);
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if (!ent)
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return PR_FALSE;
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ent->mData = aData;
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return PR_TRUE;
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}
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/**
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* remove the data for the associated key
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* @param aKey the key to remove from the hashtable
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*/
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void Remove(KeyType aKey) { RemoveEntry(aKey); }
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/**
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* function type provided by the application for enumeration.
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* @param aKey the key being enumerated
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* @param aData data being enumerated
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* @parm userArg passed unchanged from Enumerate
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* @return either
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* @link PLDHashOperator::PL_DHASH_NEXT PL_DHASH_NEXT @endlink or
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* @link PLDHashOperator::PL_DHASH_STOP PL_DHASH_STOP @endlink
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*/
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typedef PLDHashOperator
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(* EnumReadFunction)(KeyType aKey,
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UserDataType aData,
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void* userArg);
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/**
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* enumerate entries in the hashtable, without allowing changes
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* @param enumFunc enumeration callback
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* @param userArg passed unchanged to the EnumReadFunction
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*/
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PRUint32 EnumerateRead(EnumReadFunction enumFunc, void* userArg) const
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{
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NS_ASSERTION(this->mTable.entrySize,
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"nsBaseHashtable was not initialized properly.");
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s_EnumReadArgs enumData = { enumFunc, userArg };
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return PL_DHashTableEnumerate(const_cast<PLDHashTable*>(&this->mTable),
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s_EnumReadStub,
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&enumData);
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}
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/**
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* function type provided by the application for enumeration.
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* @param aKey the key being enumerated
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* @param aData Reference to data being enumerated, may be altered. e.g. for
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* nsInterfaceHashtable this is an nsCOMPtr reference...
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* @parm userArg passed unchanged from Enumerate
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* @return bitflag combination of
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* @link PLDHashOperator::PL_DHASH_REMOVE @endlink,
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* @link PLDHashOperator::PL_DHASH_NEXT PL_DHASH_NEXT @endlink, or
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* @link PLDHashOperator::PL_DHASH_STOP PL_DHASH_STOP @endlink
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*/
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typedef PLDHashOperator
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(* EnumFunction)(KeyType aKey,
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DataType& aData,
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void* userArg);
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/**
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* enumerate entries in the hashtable, allowing changes. This
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* functions write-locks the hashtable.
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* @param enumFunc enumeration callback
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* @param userArg passed unchanged to the EnumFunction
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*/
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PRUint32 Enumerate(EnumFunction enumFunc, void* userArg)
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{
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NS_ASSERTION(this->mTable.entrySize,
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"nsBaseHashtable was not initialized properly.");
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s_EnumArgs enumData = { enumFunc, userArg };
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return PL_DHashTableEnumerate(&this->mTable,
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s_EnumStub,
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&enumData);
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}
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/**
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* reset the hashtable, removing all entries
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*/
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void Clear() { nsTHashtable<EntryType>::Clear(); }
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protected:
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/**
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* used internally during EnumerateRead. Allocated on the stack.
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* @param func the enumerator passed to EnumerateRead
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* @param userArg the userArg passed to EnumerateRead
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*/
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struct s_EnumReadArgs
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{
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EnumReadFunction func;
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void* userArg;
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};
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static PLDHashOperator s_EnumReadStub(PLDHashTable *table,
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PLDHashEntryHdr *hdr,
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PRUint32 number,
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void *arg);
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struct s_EnumArgs
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{
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EnumFunction func;
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void* userArg;
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};
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static PLDHashOperator s_EnumStub(PLDHashTable *table,
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PLDHashEntryHdr *hdr,
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PRUint32 number,
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void *arg);
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};
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/**
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* This class is a thread-safe version of nsBaseHashtable.
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*/
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template<class KeyClass,class DataType,class UserDataType>
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class nsBaseHashtableMT :
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protected nsBaseHashtable<KeyClass,DataType,UserDataType>
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{
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public:
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typedef typename
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nsBaseHashtable<KeyClass,DataType,UserDataType>::EntryType EntryType;
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typedef typename
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nsBaseHashtable<KeyClass,DataType,UserDataType>::KeyType KeyType;
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typedef typename
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nsBaseHashtable<KeyClass,DataType,UserDataType>::EnumFunction EnumFunction;
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typedef typename
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nsBaseHashtable<KeyClass,DataType,UserDataType>::EnumReadFunction EnumReadFunction;
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nsBaseHashtableMT() : mLock(nsnull) { }
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~nsBaseHashtableMT();
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PRBool Init(PRUint32 initSize = PL_DHASH_MIN_SIZE);
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PRBool IsInitialized() const { return mLock != nsnull; }
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PRUint32 Count() const;
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PRBool Get(KeyType aKey, UserDataType* pData) const;
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PRBool Put(KeyType aKey, UserDataType aData);
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void Remove(KeyType aKey);
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PRUint32 EnumerateRead(EnumReadFunction enumFunc, void* userArg) const;
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PRUint32 Enumerate(EnumFunction enumFunc, void* userArg);
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void Clear();
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protected:
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PRLock* mLock;
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};
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//
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// nsBaseHashtableET definitions
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//
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template<class KeyClass,class DataType>
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nsBaseHashtableET<KeyClass,DataType>::nsBaseHashtableET(KeyTypePointer aKey) :
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KeyClass(aKey)
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{ }
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template<class KeyClass,class DataType>
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nsBaseHashtableET<KeyClass,DataType>::nsBaseHashtableET
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(nsBaseHashtableET<KeyClass,DataType>& toCopy) :
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KeyClass(toCopy),
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mData(toCopy.mData)
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{ }
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template<class KeyClass,class DataType>
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nsBaseHashtableET<KeyClass,DataType>::~nsBaseHashtableET()
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{ }
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//
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// nsBaseHashtable definitions
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//
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template<class KeyClass,class DataType,class UserDataType>
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PLDHashOperator
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nsBaseHashtable<KeyClass,DataType,UserDataType>::s_EnumReadStub
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(PLDHashTable *table, PLDHashEntryHdr *hdr, PRUint32 number, void* arg)
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{
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EntryType* ent = static_cast<EntryType*>(hdr);
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s_EnumReadArgs* eargs = (s_EnumReadArgs*) arg;
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PLDHashOperator res = (eargs->func)(ent->GetKey(), ent->mData, eargs->userArg);
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NS_ASSERTION( !(res & PL_DHASH_REMOVE ),
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"PL_DHASH_REMOVE return during const enumeration; ignoring.");
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if (res & PL_DHASH_STOP)
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return PL_DHASH_STOP;
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return PL_DHASH_NEXT;
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}
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template<class KeyClass,class DataType,class UserDataType>
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PLDHashOperator
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nsBaseHashtable<KeyClass,DataType,UserDataType>::s_EnumStub
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(PLDHashTable *table, PLDHashEntryHdr *hdr, PRUint32 number, void* arg)
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{
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EntryType* ent = static_cast<EntryType*>(hdr);
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s_EnumArgs* eargs = (s_EnumArgs*) arg;
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return (eargs->func)(ent->GetKey(), ent->mData, eargs->userArg);
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}
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//
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// nsBaseHashtableMT definitions
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//
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template<class KeyClass,class DataType,class UserDataType>
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nsBaseHashtableMT<KeyClass,DataType,UserDataType>::~nsBaseHashtableMT()
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{
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if (this->mLock)
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PR_DestroyLock(this->mLock);
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}
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template<class KeyClass,class DataType,class UserDataType>
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PRBool
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nsBaseHashtableMT<KeyClass,DataType,UserDataType>::Init(PRUint32 initSize)
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{
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if (!nsTHashtable<EntryType>::IsInitialized() && !nsTHashtable<EntryType>::Init(initSize))
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return PR_FALSE;
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this->mLock = PR_NewLock();
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NS_ASSERTION(this->mLock, "Error creating lock during nsBaseHashtableL::Init()");
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return (this->mLock != nsnull);
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}
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template<class KeyClass,class DataType,class UserDataType>
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PRUint32
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nsBaseHashtableMT<KeyClass,DataType,UserDataType>::Count() const
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{
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PR_Lock(this->mLock);
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PRUint32 count = nsTHashtable<EntryType>::Count();
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PR_Unlock(this->mLock);
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return count;
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}
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template<class KeyClass,class DataType,class UserDataType>
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PRBool
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nsBaseHashtableMT<KeyClass,DataType,UserDataType>::Get(KeyType aKey,
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UserDataType* pData) const
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{
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PR_Lock(this->mLock);
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PRBool res =
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nsBaseHashtable<KeyClass,DataType,UserDataType>::Get(aKey, pData);
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PR_Unlock(this->mLock);
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return res;
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}
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template<class KeyClass,class DataType,class UserDataType>
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PRBool
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nsBaseHashtableMT<KeyClass,DataType,UserDataType>::Put(KeyType aKey,
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UserDataType aData)
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{
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PR_Lock(this->mLock);
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PRBool res =
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nsBaseHashtable<KeyClass,DataType,UserDataType>::Put(aKey, aData);
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PR_Unlock(this->mLock);
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return res;
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}
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template<class KeyClass,class DataType,class UserDataType>
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void
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nsBaseHashtableMT<KeyClass,DataType,UserDataType>::Remove(KeyType aKey)
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{
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PR_Lock(this->mLock);
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nsBaseHashtable<KeyClass,DataType,UserDataType>::Remove(aKey);
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PR_Unlock(this->mLock);
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}
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template<class KeyClass,class DataType,class UserDataType>
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PRUint32
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nsBaseHashtableMT<KeyClass,DataType,UserDataType>::EnumerateRead
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(EnumReadFunction fEnumCall, void* userArg) const
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{
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PR_Lock(this->mLock);
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PRUint32 count =
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nsBaseHashtable<KeyClass,DataType,UserDataType>::EnumerateRead(fEnumCall, userArg);
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PR_Unlock(this->mLock);
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return count;
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}
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template<class KeyClass,class DataType,class UserDataType>
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PRUint32
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nsBaseHashtableMT<KeyClass,DataType,UserDataType>::Enumerate
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(EnumFunction fEnumCall, void* userArg)
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{
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PR_Lock(this->mLock);
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PRUint32 count =
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nsBaseHashtable<KeyClass,DataType,UserDataType>::Enumerate(fEnumCall, userArg);
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PR_Unlock(this->mLock);
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return count;
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}
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template<class KeyClass,class DataType,class UserDataType>
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void
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nsBaseHashtableMT<KeyClass,DataType,UserDataType>::Clear()
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{
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PR_Lock(this->mLock);
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nsBaseHashtable<KeyClass,DataType,UserDataType>::Clear();
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PR_Unlock(this->mLock);
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}
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#endif // nsBaseHashtable_h__
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