pjs/xpcom/ds/nsStaticNameTable.cpp

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4.8 KiB
C++
Исходник Обычный вид История

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/* -*- Mode: C++; tab-width: 2; 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 oqr
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is Mozilla Communicator client code, released
* March 31, 1998.
*
* 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):
*
* Alternatively, the contents of this file may be used under the
* terms of the GNU Public License (the "GPL"), in which case the
* provisions of the GPL are applicable instead of those above.
* If you wish to allow use of your version of this file only
* under the terms of the GPL and not to allow others to use your
* version of this file under the NPL, indicate your decision by
* deleting the provisions above and replace them with the notice
* and other provisions required by the GPL. If you do not delete
* the provisions above, a recipient may use your version of this
* file under either the NPL or the GPL.
*/
/* Class to manage lookup of static names in a table. */
#include "nscore.h"
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#include "nsString.h"
#include "nsStaticNameTable.h"
#include "nsReadableUtils.h"
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nsStaticCaseInsensitiveNameTable::nsStaticCaseInsensitiveNameTable()
: mNameArray(nsnull), mNameTable(nsnull), mCount(0), mNullStr("")
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{
MOZ_COUNT_CTOR(nsStaticCaseInsensitiveNameTable);
}
nsStaticCaseInsensitiveNameTable::~nsStaticCaseInsensitiveNameTable()
{
// manually call the destructor on placement-new'ed objects
for (PRInt32 index = 0; index < mCount; index++) {
mNameArray[index].~nsDependentCString();
}
nsMemory::Free((void*)mNameArray);
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delete mNameTable;
MOZ_COUNT_DTOR(nsStaticCaseInsensitiveNameTable);
}
PRBool
nsStaticCaseInsensitiveNameTable::Init(const char* Names[], PRInt32 Count)
{
NS_ASSERTION(!mNameArray, "double Init");
NS_ASSERTION(!mNameTable, "double Init");
NS_ASSERTION(Names, "null name table");
NS_ASSERTION(Count, "0 count");
mCount = Count;
mNameArray = (nsDependentCString*)nsMemory::Alloc(Count * sizeof(nsDependentCString));
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// XXX best bucket count heuristic?
mNameTable = new nsHashtable(Count<16 ? Count : Count<128 ? Count/4 : 128);
if (!mNameArray || !mNameTable) {
return PR_FALSE;
}
for (PRInt32 index = 0; index < Count; ++index) {
char* raw = (char*) Names[index];
PRUint32 len = nsCRT::strlen(raw);
#ifdef DEBUG
{
// verify invarients of contents
nsCAutoString temp1(raw);
nsDependentCString temp2(raw);
ToLowerCase(temp1);
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NS_ASSERTION(temp1.Equals(temp2), "upper case char in table");
}
#endif
// use placement-new to initialize the string object
nsDependentCString *str =
new (&mNameArray[index]) nsDependentCString(raw);
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nsCStringKey key(raw, len, nsCStringKey::NEVER_OWN);
mNameTable->Put(&key, (void*)(index+1)); // to make 0 != nsnull
}
return PR_TRUE;
}
inline PRInt32
LookupLowercasedKeyword(const nsACString& aLowercasedKeyword,
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nsHashtable* aTable)
{
nsCStringKey key(aLowercasedKeyword);
void* val = aTable->Get(&key);
return val ? NS_PTR_TO_INT32(val) - 1 :
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nsStaticCaseInsensitiveNameTable::NOT_FOUND;
}
PRInt32
nsStaticCaseInsensitiveNameTable::Lookup(const nsACString& aName)
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{
NS_ASSERTION(mNameArray, "not inited");
NS_ASSERTION(mNameTable, "not inited");
NS_ASSERTION(mCount, "not inited");
nsCAutoString strLower(aName);
ToLowerCase(strLower);
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return LookupLowercasedKeyword(strLower, mNameTable);
}
PRInt32
nsStaticCaseInsensitiveNameTable::Lookup(const nsAString& aName)
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{
NS_ASSERTION(mNameArray, "not inited");
NS_ASSERTION(mNameTable, "not inited");
NS_ASSERTION(mCount, "not inited");
nsCAutoString strLower;
strLower.AssignWithConversion(aName);
ToLowerCase(strLower);
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return LookupLowercasedKeyword(strLower, mNameTable);
}
const nsAFlatCString&
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nsStaticCaseInsensitiveNameTable::GetStringValue(PRInt32 index)
{
NS_ASSERTION(mNameArray, "not inited");
NS_ASSERTION(mNameTable, "not inited");
NS_ASSERTION(mCount, "not inited");
if ((NOT_FOUND < index) && (index < mCount)) {
return mNameArray[index];
} else {
return mNullStr;
}
}