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434 lines
13 KiB
C++
434 lines
13 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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* This Original Code has been modified by IBM Corporation.
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* Modifications made by IBM described herein are
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* Copyright (c) International Business Machines
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* Corporation, 2000
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*
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* Modifications to Mozilla code or documentation
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* identified per MPL Section 3.3
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*
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* Date Modified by Description of modification
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* 04/20/2000 IBM Corp. Added PR_CALLBACK for Optlink use in OS2
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*/
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#ifndef nsHashtable_h__
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#define nsHashtable_h__
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#include "plhash.h"
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#include "prlock.h"
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#include "nscore.h"
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#include "nsCom.h"
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#include "nsString.h"
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#include "nsFixedSizeAllocator.h"
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class nsIObjectInputStream;
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class nsIObjectOutputStream;
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class nsHashtable;
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class nsStringKey;
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class NS_COM nsHashKey {
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protected:
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nsHashKey(void) {
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#ifdef DEBUG
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mKeyType = UnknownKey;
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#endif
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MOZ_COUNT_CTOR(nsHashKey);
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}
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public:
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virtual ~nsHashKey(void);
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virtual PRUint32 HashCode(void) const = 0;
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virtual PRBool Equals(const nsHashKey *aKey) const = 0;
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virtual nsHashKey *Clone() const = 0;
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virtual nsresult Write(nsIObjectOutputStream* aStream) const;
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#ifdef DEBUG
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public:
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// used for verification that we're casting to the correct key type
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enum nsHashKeyType {
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UnknownKey,
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SupportsKey,
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PRUint32Key,
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VoidKey,
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IDKey,
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CStringKey,
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StringKey,
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OpaqueKey
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};
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nsHashKeyType GetKeyType() const { return mKeyType; }
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protected:
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nsHashKeyType mKeyType;
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#endif
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};
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// Enumerator and Read/Write callback functions.
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typedef PRBool
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(*PR_CALLBACK nsHashtableEnumFunc)(nsHashKey *aKey, void *aData, void* aClosure);
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typedef nsresult
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(*PR_CALLBACK nsHashtableReadEntryFunc)(nsIObjectInputStream *aStream,
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nsHashKey **aKey,
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void **aData);
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// NB: may be called with null aKey or aData, to free just one of the two.
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typedef void
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(*PR_CALLBACK nsHashtableFreeEntryFunc)(nsIObjectInputStream *aStream,
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nsHashKey *aKey,
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void *aData);
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typedef nsresult
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(*PR_CALLBACK nsHashtableWriteDataFunc)(nsIObjectOutputStream *aStream,
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void *aData);
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class NS_COM nsHashtable {
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protected:
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// members
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PRLock* mLock;
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PLHashTable mHashtable;
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PRBool mEnumerating;
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nsFixedSizeAllocator mPool;
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public:
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nsHashtable(PRUint32 aSize = 16, PRBool threadSafe = PR_FALSE);
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virtual ~nsHashtable();
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PRInt32 Count(void) { return mHashtable.nentries; }
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PRBool Exists(nsHashKey *aKey);
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void *Put(nsHashKey *aKey, void *aData);
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void *Get(nsHashKey *aKey);
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void *Remove(nsHashKey *aKey);
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nsHashtable *Clone();
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void Enumerate(nsHashtableEnumFunc aEnumFunc, void* aClosure = NULL);
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void Reset();
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void Reset(nsHashtableEnumFunc destroyFunc, void* aClosure = NULL);
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nsHashtable(nsIObjectInputStream* aStream,
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nsHashtableReadEntryFunc aReadEntryFunc,
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nsHashtableFreeEntryFunc aFreeEntryFunc,
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nsresult *aRetVal);
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nsresult Write(nsIObjectOutputStream* aStream,
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nsHashtableWriteDataFunc aWriteDataFunc) const;
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};
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////////////////////////////////////////////////////////////////////////////////
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// nsObjectHashtable: an nsHashtable where the elements are C++ objects to be
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// deleted
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typedef void* (*PR_CALLBACK nsHashtableCloneElementFunc)(nsHashKey *aKey, void *aData, void* aClosure);
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class NS_COM nsObjectHashtable : public nsHashtable {
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public:
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nsObjectHashtable(nsHashtableCloneElementFunc cloneElementFun,
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void* cloneElementClosure,
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nsHashtableEnumFunc destroyElementFun,
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void* destroyElementClosure,
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PRUint32 aSize = 16, PRBool threadSafe = PR_FALSE);
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~nsObjectHashtable();
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nsHashtable *Clone();
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void Reset();
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PRBool RemoveAndDelete(nsHashKey *aKey);
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protected:
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static PRIntn PR_CALLBACK CopyElement(PLHashEntry *he, PRIntn i, void *arg);
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nsHashtableCloneElementFunc mCloneElementFun;
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void* mCloneElementClosure;
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nsHashtableEnumFunc mDestroyElementFun;
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void* mDestroyElementClosure;
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};
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////////////////////////////////////////////////////////////////////////////////
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// nsSupportsHashtable: an nsHashtable where the elements are nsISupports*
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class nsISupports;
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class NS_COM nsSupportsHashtable
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: private nsHashtable
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{
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public:
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typedef PRBool (* PR_CALLBACK EnumFunc) (nsHashKey *aKey, void *aData, void* aClosure);
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nsSupportsHashtable(PRUint32 aSize = 16, PRBool threadSafe = PR_FALSE)
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: nsHashtable(aSize, threadSafe) {}
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~nsSupportsHashtable();
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PRInt32 Count(void) {
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return nsHashtable::Count();
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}
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PRBool Exists(nsHashKey *aKey) {
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return nsHashtable::Exists (aKey);
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}
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PRBool Put(nsHashKey *aKey,
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nsISupports *aData,
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nsISupports **value = nsnull);
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nsISupports* Get(nsHashKey *aKey);
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PRBool Remove(nsHashKey *aKey, nsISupports **value = nsnull);
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nsHashtable *Clone();
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void Enumerate(EnumFunc aEnumFunc, void* aClosure = NULL) {
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nsHashtable::Enumerate(aEnumFunc, aClosure);
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}
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void Reset();
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private:
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static PRBool PR_CALLBACK ReleaseElement(nsHashKey *, void *, void *);
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static PRIntn PR_CALLBACK EnumerateCopy(PLHashEntry *, PRIntn, void *);
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};
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////////////////////////////////////////////////////////////////////////////////
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// nsISupportsKey: Where keys are nsISupports objects that get refcounted.
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#include "nsISupports.h"
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class NS_COM nsISupportsKey : public nsHashKey {
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protected:
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nsISupports* mKey;
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public:
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nsISupportsKey(nsISupports* key) {
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#ifdef DEBUG
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mKeyType = SupportsKey;
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#endif
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mKey = key;
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NS_IF_ADDREF(mKey);
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}
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~nsISupportsKey(void) {
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NS_IF_RELEASE(mKey);
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}
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PRUint32 HashCode(void) const {
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return NS_PTR_TO_INT32(mKey);
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}
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PRBool Equals(const nsHashKey *aKey) const {
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NS_ASSERTION(aKey->GetKeyType() == SupportsKey, "mismatched key types");
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return (mKey == ((nsISupportsKey *) aKey)->mKey);
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}
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nsHashKey *Clone() const {
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return new nsISupportsKey(mKey);
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}
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nsISupportsKey(nsIObjectInputStream* aStream, nsresult *aResult);
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nsresult Write(nsIObjectOutputStream* aStream) const;
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};
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class nsPRUint32Key : public nsHashKey {
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protected:
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PRUint32 mKey;
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public:
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nsPRUint32Key(PRUint32 key) {
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#ifdef DEBUG
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mKeyType = PRUint32Key;
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#endif
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mKey = key;
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}
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PRUint32 HashCode(void) const {
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return mKey;
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}
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PRBool Equals(const nsHashKey *aKey) const {
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return mKey == ((const nsPRUint32Key *) aKey)->mKey;
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}
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nsHashKey *Clone() const {
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return new nsPRUint32Key(mKey);
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}
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PRUint32 GetValue() { return mKey; }
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};
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////////////////////////////////////////////////////////////////////////////////
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// nsVoidKey: Where keys are void* objects that don't get refcounted.
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class nsVoidKey : public nsHashKey {
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protected:
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void* mKey;
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public:
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nsVoidKey(void* key) {
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#ifdef DEBUG
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mKeyType = VoidKey;
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#endif
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mKey = key;
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}
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PRUint32 HashCode(void) const {
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return NS_PTR_TO_INT32(mKey);
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}
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PRBool Equals(const nsHashKey *aKey) const {
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NS_ASSERTION(aKey->GetKeyType() == VoidKey, "mismatched key types");
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return (mKey == ((const nsVoidKey *) aKey)->mKey);
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}
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nsHashKey *Clone() const {
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return new nsVoidKey(mKey);
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}
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void* GetValue() { return mKey; }
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};
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////////////////////////////////////////////////////////////////////////////////
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// nsIDKey: Where keys are nsIDs (e.g. nsIID, nsCID).
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#include "nsID.h"
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class NS_COM nsIDKey : public nsHashKey {
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protected:
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nsID mID;
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public:
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nsIDKey(const nsID &aID) {
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#ifdef DEBUG
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mKeyType = IDKey;
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#endif
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mID = aID;
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}
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PRUint32 HashCode(void) const {
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return mID.m0;
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}
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PRBool Equals(const nsHashKey *aKey) const {
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NS_ASSERTION(aKey->GetKeyType() == IDKey, "mismatched key types");
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return (mID.Equals(((const nsIDKey *) aKey)->mID));
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}
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nsHashKey *Clone() const {
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return new nsIDKey(mID);
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}
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nsIDKey(nsIObjectInputStream* aStream, nsresult *aResult);
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nsresult Write(nsIObjectOutputStream* aStream) const;
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};
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////////////////////////////////////////////////////////////////////////////////
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#include "nsString.h"
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// for null-terminated c-strings
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class NS_COM nsCStringKey : public nsHashKey {
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public:
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// NB: when serializing, NEVER_OWN keys are deserialized as OWN.
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enum Ownership {
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NEVER_OWN, // very long lived, even clones don't need to copy it.
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OWN_CLONE, // as long lived as this key. But clones make a copy.
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OWN // to be free'd in key dtor. Clones make their own copy.
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};
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nsCStringKey(const char* str, PRInt32 strLen = -1, Ownership own = OWN_CLONE);
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nsCStringKey(const nsAFlatCString& str);
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nsCStringKey(const nsACString& str);
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~nsCStringKey(void);
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PRUint32 HashCode(void) const;
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PRBool Equals(const nsHashKey* aKey) const;
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nsHashKey* Clone() const;
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nsCStringKey(nsIObjectInputStream* aStream, nsresult *aResult);
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nsresult Write(nsIObjectOutputStream* aStream) const;
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// For when the owner of the hashtable wants to peek at the actual
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// string in the key. No copy is made, so be careful.
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const char* GetString() const { return mStr; }
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PRUint32 GetStringLength() const { return mStrLen; }
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protected:
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char* mStr;
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PRUint32 mStrLen;
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Ownership mOwnership;
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};
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// for null-terminated unicode strings
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class NS_COM nsStringKey : public nsHashKey {
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public:
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// NB: when serializing, NEVER_OWN keys are deserialized as OWN.
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enum Ownership {
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NEVER_OWN, // very long lived, even clones don't need to copy it.
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OWN_CLONE, // as long lived as this key. But clones make a copy.
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OWN // to be free'd in key dtor. Clones make their own copy.
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};
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nsStringKey(const PRUnichar* str, PRInt32 strLen = -1, Ownership own = OWN_CLONE);
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nsStringKey(const nsAFlatString& str);
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nsStringKey(const nsAString& str);
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~nsStringKey(void);
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PRUint32 HashCode(void) const;
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PRBool Equals(const nsHashKey* aKey) const;
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nsHashKey* Clone() const;
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nsStringKey(nsIObjectInputStream* aStream, nsresult *aResult);
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nsresult Write(nsIObjectOutputStream* aStream) const;
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// For when the owner of the hashtable wants to peek at the actual
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// string in the key. No copy is made, so be careful.
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const PRUnichar* GetString() const { return mStr; }
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PRUint32 GetStringLength() const { return mStrLen; }
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protected:
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PRUnichar* mStr;
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PRUint32 mStrLen;
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Ownership mOwnership;
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};
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// for opaque buffers of data which may contain nulls
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class NS_COM nsOpaqueKey : public nsHashKey {
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public:
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// NB: when serializing, NEVER_OWN keys are deserialized as OWN.
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enum Ownership {
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NEVER_OWN, // very long lived, even clones don't need to copy it.
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OWN_CLONE, // as long lived as this key. But clones make a copy.
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OWN // to be free'd in key dtor. Clones make their own copy.
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};
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nsOpaqueKey(const char* buf, PRUint32 bufLen, Ownership own = OWN_CLONE);
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~nsOpaqueKey(void);
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PRUint32 HashCode(void) const;
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PRBool Equals(const nsHashKey* aKey) const;
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nsHashKey* Clone() const;
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nsOpaqueKey(nsIObjectInputStream* aStream, nsresult *aResult);
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nsresult Write(nsIObjectOutputStream* aStream) const;
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// For when the owner of the hashtable wants to peek at the actual
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// string in the key. No copy is made, so be careful.
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const char* GetBuffer() const { return mBuf; }
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PRUint32 GetBufferLength() const { return mBufLen; }
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protected:
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char* mBuf;
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PRUint32 mBufLen;
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Ownership mOwnership;
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};
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////////////////////////////////////////////////////////////////////////////////
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#endif // nsHashtable_h__
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