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