gecko-dev/xpcom/ds/nsHashtable.h

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/*
* The contents of this file are subject to the Netscape 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/NPL/
*
* 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 mozilla.org code.
*
* The Initial Developer of the Original Code is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
*/
#ifndef nsHashtable_h__
#define nsHashtable_h__
#include "plhash.h"
#include "prlock.h"
#include "nsCom.h"
class NS_COM nsHashKey {
protected:
nsHashKey(void);
public:
virtual ~nsHashKey(void);
virtual PRUint32 HashValue(void) const = 0;
virtual PRBool Equals(const nsHashKey *aKey) const = 0;
virtual nsHashKey *Clone(void) const = 0;
};
// Enumerator callback function. Use
typedef PRBool (*nsHashtableEnumFunc)(nsHashKey *aKey, void *aData, void* closure);
class NS_COM nsHashtable {
protected:
// members
PLHashTable *hashtable;
PRLock *mLock;
public:
nsHashtable(PRUint32 aSize = 256, PRBool threadSafe = PR_FALSE);
~nsHashtable();
PRInt32 Count(void) { return hashtable->nentries; }
PRBool Exists(nsHashKey *aKey);
void *Put(nsHashKey *aKey, void *aData);
void *Get(nsHashKey *aKey);
void *Remove(nsHashKey *aKey);
nsHashtable *Clone();
void Enumerate(nsHashtableEnumFunc aEnumFunc, void* closure = NULL);
void Reset();
void Reset(nsHashtableEnumFunc destroyFunc, void* closure = NULL);
};
////////////////////////////////////////////////////////////////////////////////
// nsObjectHashtable: an nsHashtable where the elements are C++ objects to be
// deleted
typedef void* (*nsHashtableCloneElementFunc)(nsHashKey *aKey, void *aData, void* closure);
class NS_COM nsObjectHashtable : public nsHashtable {
public:
nsObjectHashtable(nsHashtableCloneElementFunc cloneElementFun,
void* cloneElementClosure,
nsHashtableEnumFunc destroyElementFun,
void* destroyElementClosure,
PRUint32 aSize = 256, PRBool threadSafe = PR_FALSE);
~nsObjectHashtable();
nsHashtable *Clone();
void Reset();
PRBool RemoveAndDelete(nsHashKey *aKey);
protected:
static PR_CALLBACK PRIntn CopyElement(PLHashEntry *he, PRIntn i, void *arg);
nsHashtableCloneElementFunc mCloneElementFun;
void* mCloneElementClosure;
nsHashtableEnumFunc mDestroyElementFun;
void* mDestroyElementClosure;
};
////////////////////////////////////////////////////////////////////////////////
// nsSupportsHashtable: an nsHashtable where the elements are nsISupports*
class NS_COM nsSupportsHashtable : public nsHashtable {
public:
nsSupportsHashtable(PRUint32 aSize = 256, PRBool threadSafe = PR_FALSE)
: nsHashtable(aSize, threadSafe) {}
~nsSupportsHashtable();
void *Put(nsHashKey *aKey, void *aData);
void *Get(nsHashKey *aKey);
void *Remove(nsHashKey *aKey);
nsHashtable *Clone();
void Reset();
};
////////////////////////////////////////////////////////////////////////////////
// nsISupportsKey: Where keys are nsISupports objects that get refcounted.
#include "nsISupports.h"
class nsISupportsKey : public nsHashKey {
protected:
nsISupports* mKey;
public:
nsISupportsKey(nsISupports* key) {
mKey = key;
NS_IF_ADDREF(mKey);
}
~nsISupportsKey(void) {
NS_IF_RELEASE(mKey);
}
PRUint32 HashValue(void) const {
return (PRUint32)mKey;
}
PRBool Equals(const nsHashKey *aKey) const {
return (mKey == ((nsISupportsKey *) aKey)->mKey);
}
nsHashKey *Clone(void) const {
return new nsISupportsKey(mKey);
}
};
////////////////////////////////////////////////////////////////////////////////
// nsVoidKey: Where keys are void* objects that don't get refcounted.
class nsVoidKey : public nsHashKey {
protected:
const void* mKey;
public:
nsVoidKey(const void* key) {
mKey = key;
}
PRUint32 HashValue(void) const {
return (PRUint32)mKey;
}
PRBool Equals(const nsHashKey *aKey) const {
return (mKey == ((const nsVoidKey *) aKey)->mKey);
}
nsHashKey *Clone(void) const {
return new nsVoidKey(mKey);
}
};
////////////////////////////////////////////////////////////////////////////////
// nsIDKey: Where keys are nsIDs (e.g. nsIID, nsCID).
#include "nsID.h"
class nsIDKey : public nsHashKey {
protected:
nsID mID;
public:
nsIDKey(const nsID &aID) {
mID = aID;
}
PRUint32 HashValue(void) const {
return mID.m0;
}
PRBool Equals(const nsHashKey *aKey) const {
return (mID.Equals(((const nsIDKey *) aKey)->mID));
}
nsHashKey *Clone(void) const {
return new nsIDKey(mID);
}
};
////////////////////////////////////////////////////////////////////////////////
// nsStringKey: Where keys are PRUnichar* or char*
// Some uses: hashing ProgIDs, filenames, URIs
#include "nsString.h"
class NS_COM nsStringKey : public nsHashKey {
protected:
nsAutoString mStr;
public:
nsStringKey(const char* str);
nsStringKey(const PRUnichar* str);
nsStringKey(const nsStr& str);
~nsStringKey(void);
PRUint32 HashValue(void) const;
PRBool Equals(const nsHashKey* aKey) const;
nsHashKey* Clone() const;
// For when the owner of the hashtable wants to peek at the actual
// string in the key. No copy is made, so be careful.
const nsString& GetString() const;
};
////////////////////////////////////////////////////////////////////////////////
// nsOpaqueKey: Where keys are opaque byte-array blobs
#include "nsString.h"
class NS_COM nsOpaqueKey : public nsHashKey {
protected:
const char* mOpaqueKey; // Byte array of opaque data
PRUint32 mKeyLength; // Length, in bytes, of mOpaqueKey
public:
// Note opaque keys are not copied by this constructor. If you want a private
// copy in each hash key, you must create one and pass it in to this function.
nsOpaqueKey(const char* aOpaqueKey, PRUint32 aKeyLength);
~nsOpaqueKey(void);
PRUint32 HashValue(void) const;
PRBool Equals(const nsHashKey* aKey) const;
nsHashKey* Clone() const;
// For when the owner of the hashtable wants to peek at the actual
// opaque array in the key. No copy is made, so be careful.
const char* GetKey() const;
PRUint32 GetKeyLength() const;
};
#endif