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155 lines
4.1 KiB
C++
155 lines
4.1 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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#include "nsIAtom.h"
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#include "nsString.h"
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#include "nsCRT.h"
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#include "plhash.h"
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#include "nsISizeOfHandler.h"
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/**
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* The shared hash table for atom lookups.
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*/
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static nsrefcnt gAtoms;
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static struct PLHashTable* gAtomHashTable;
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class AtomImpl : public nsIAtom {
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public:
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AtomImpl();
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~AtomImpl();
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NS_DECL_ISUPPORTS
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void* operator new(size_t size, const PRUnichar* us, PRInt32 uslen);
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virtual void ToString(nsString& aBuf) const;
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virtual const PRUnichar* GetUnicode() const;
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NS_IMETHOD SizeOf(nsISizeOfHandler* aHandler) const;
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// Actually more; 0 terminated. This slot is reserved for the
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// terminating zero.
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PRUnichar mString[1];
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};
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AtomImpl::AtomImpl()
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{
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NS_INIT_REFCNT();
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// Every live atom holds a reference on the atom hashtable
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gAtoms++;
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}
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AtomImpl::~AtomImpl()
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{
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NS_PRECONDITION(nsnull != gAtomHashTable, "null atom hashtable");
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if (nsnull != gAtomHashTable) {
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PL_HashTableRemove(gAtomHashTable, mString);
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nsrefcnt cnt = --gAtoms;
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if (0 == cnt) {
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// When the last atom is destroyed, the atom arena is destroyed
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NS_ASSERTION(0 == gAtomHashTable->nentries, "bad atom table");
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PL_HashTableDestroy(gAtomHashTable);
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gAtomHashTable = nsnull;
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}
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}
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}
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static NS_DEFINE_IID(kIAtomIID, NS_IATOM_IID);
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NS_IMPL_ISUPPORTS(AtomImpl, kIAtomIID);
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void* AtomImpl::operator new(size_t size, const PRUnichar* us, PRInt32 uslen)
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{
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size = size + uslen * sizeof(PRUnichar);
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AtomImpl* ii = (AtomImpl*) new char[size];
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nsCRT::memcpy(ii->mString, us, uslen * sizeof(PRUnichar));
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ii->mString[uslen] = 0;
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return ii;
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}
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void AtomImpl::ToString(nsString& aBuf) const
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{
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aBuf.SetLength(0);
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aBuf.Append(mString, nsCRT::strlen(mString));
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}
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const PRUnichar* AtomImpl::GetUnicode() const
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{
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return mString;
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}
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NS_IMETHODIMP
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AtomImpl::SizeOf(nsISizeOfHandler* aHandler) const
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{
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aHandler->Add(sizeof(*this) + nsCRT::strlen(mString) * sizeof(PRUnichar));
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return NS_OK;
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}
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//----------------------------------------------------------------------
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static PLHashNumber HashKey(const PRUnichar* k)
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{
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return (PLHashNumber) nsCRT::HashValue(k);
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}
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static PRIntn CompareKeys(const PRUnichar* k1, const PRUnichar* k2)
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{
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return nsCRT::strcmp(k1, k2) == 0;
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}
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NS_BASE nsIAtom* NS_NewAtom(const char* isolatin1)
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{
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nsAutoString tmp(isolatin1);
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return NS_NewAtom(tmp.GetUnicode());
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}
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NS_BASE nsIAtom* NS_NewAtom(const nsString& aString)
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{
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return NS_NewAtom(aString.GetUnicode());
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}
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NS_BASE nsIAtom* NS_NewAtom(const PRUnichar* us)
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{
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if (nsnull == gAtomHashTable) {
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gAtomHashTable = PL_NewHashTable(8, (PLHashFunction) HashKey,
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(PLHashComparator) CompareKeys,
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(PLHashComparator) nsnull,
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nsnull, nsnull);
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}
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PRInt32 uslen;
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PRUint32 hashCode = nsCRT::HashValue(us, &uslen);
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PLHashEntry** hep = PL_HashTableRawLookup(gAtomHashTable, hashCode, us);
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PLHashEntry* he = *hep;
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if (nsnull != he) {
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nsIAtom* id = (nsIAtom*) he->value;
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NS_ADDREF(id);
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return id;
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}
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AtomImpl* id = new(us, uslen) AtomImpl();
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PL_HashTableRawAdd(gAtomHashTable, hep, hashCode, id->mString, id);
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NS_ADDREF(id);
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return id;
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}
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NS_BASE nsrefcnt NS_GetNumberOfAtoms(void)
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{
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if (nsnull != gAtomHashTable) {
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NS_PRECONDITION(nsrefcnt(gAtomHashTable->nentries) == gAtoms, "bad atom table");
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}
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return gAtoms;
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}
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