mirror of
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262 lines
7.8 KiB
C++
262 lines
7.8 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is String Enumerator.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corp.
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* Portions created by the Initial Developer are Copyright (C) 2003
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Alec Flett <alecf@netscape.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "nsStringEnumerator.h"
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#include "prtypes.h"
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#include "nsCRT.h"
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#include "nsString.h"
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#include "nsReadableUtils.h"
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#include "nsISimpleEnumerator.h"
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#include "nsSupportsPrimitives.h"
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//
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// nsStringEnumerator
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//
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class nsStringEnumerator : public nsIStringEnumerator,
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public nsIUTF8StringEnumerator,
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public nsISimpleEnumerator
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{
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public:
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nsStringEnumerator(const nsTArray<nsString>* aArray, PRBool aOwnsArray) :
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mArray(aArray), mIndex(0), mOwnsArray(aOwnsArray), mIsUnicode(PR_TRUE)
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{}
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nsStringEnumerator(const nsTArray<nsCString>* aArray, PRBool aOwnsArray) :
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mCArray(aArray), mIndex(0), mOwnsArray(aOwnsArray), mIsUnicode(PR_FALSE)
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{}
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nsStringEnumerator(const nsTArray<nsString>* aArray, nsISupports* aOwner) :
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mArray(aArray), mIndex(0), mOwner(aOwner), mOwnsArray(PR_FALSE), mIsUnicode(PR_TRUE)
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{}
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nsStringEnumerator(const nsTArray<nsCString>* aArray, nsISupports* aOwner) :
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mCArray(aArray), mIndex(0), mOwner(aOwner), mOwnsArray(PR_FALSE), mIsUnicode(PR_FALSE)
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{}
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NS_DECL_ISUPPORTS
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NS_DECL_NSIUTF8STRINGENUMERATOR
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// have to declare nsIStringEnumerator manually, because of
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// overlapping method names
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NS_IMETHOD GetNext(nsAString& aResult);
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NS_DECL_NSISIMPLEENUMERATOR
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private:
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~nsStringEnumerator() {
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if (mOwnsArray) {
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// const-casting is safe here, because the NS_New*
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// constructors make sure mOwnsArray is consistent with
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// the constness of the objects
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if (mIsUnicode)
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delete const_cast<nsTArray<nsString>*>(mArray);
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else
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delete const_cast<nsTArray<nsCString>*>(mCArray);
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}
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}
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union {
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const nsTArray<nsString>* mArray;
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const nsTArray<nsCString>* mCArray;
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};
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inline PRUint32 Count() {
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return mIsUnicode ? mArray->Length() : mCArray->Length();
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}
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PRUint32 mIndex;
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// the owner allows us to hold a strong reference to the object
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// that owns the array. Having a non-null value in mOwner implies
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// that mOwnsArray is PR_FALSE, because we rely on the real owner
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// to release the array
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nsCOMPtr<nsISupports> mOwner;
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PRPackedBool mOwnsArray;
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PRPackedBool mIsUnicode;
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};
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NS_IMPL_ISUPPORTS3(nsStringEnumerator,
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nsIStringEnumerator,
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nsIUTF8StringEnumerator,
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nsISimpleEnumerator)
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NS_IMETHODIMP
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nsStringEnumerator::HasMore(PRBool* aResult)
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{
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NS_ENSURE_ARG_POINTER(aResult);
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*aResult = mIndex < Count();
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStringEnumerator::HasMoreElements(PRBool* aResult)
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{
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return HasMore(aResult);
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}
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NS_IMETHODIMP
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nsStringEnumerator::GetNext(nsISupports** aResult)
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{
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if (mIsUnicode) {
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nsSupportsStringImpl* stringImpl = new nsSupportsStringImpl();
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if (!stringImpl) return NS_ERROR_OUT_OF_MEMORY;
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stringImpl->SetData(mArray->ElementAt(mIndex++));
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*aResult = stringImpl;
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}
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else {
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nsSupportsCStringImpl* cstringImpl = new nsSupportsCStringImpl();
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if (!cstringImpl) return NS_ERROR_OUT_OF_MEMORY;
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cstringImpl->SetData(mCArray->ElementAt(mIndex++));
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*aResult = cstringImpl;
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}
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NS_ADDREF(*aResult);
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStringEnumerator::GetNext(nsAString& aResult)
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{
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NS_ENSURE_TRUE(mIndex < Count(), NS_ERROR_UNEXPECTED);
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if (mIsUnicode)
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aResult = mArray->ElementAt(mIndex++);
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else
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CopyUTF8toUTF16(mCArray->ElementAt(mIndex++), aResult);
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStringEnumerator::GetNext(nsACString& aResult)
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{
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NS_ENSURE_TRUE(mIndex < Count(), NS_ERROR_UNEXPECTED);
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if (mIsUnicode)
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CopyUTF16toUTF8(mArray->ElementAt(mIndex++), aResult);
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else
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aResult = mCArray->ElementAt(mIndex++);
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return NS_OK;
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}
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template<class T>
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static inline nsresult
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StringEnumeratorTail(T** aResult NS_INPARAM)
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{
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if (!*aResult)
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return NS_ERROR_OUT_OF_MEMORY;
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NS_ADDREF(*aResult);
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return NS_OK;
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}
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//
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// constructors
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//
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NS_COM nsresult
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NS_NewStringEnumerator(nsIStringEnumerator** aResult,
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const nsTArray<nsString>* aArray, nsISupports* aOwner)
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{
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NS_ENSURE_ARG_POINTER(aResult);
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NS_ENSURE_ARG_POINTER(aArray);
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*aResult = new nsStringEnumerator(aArray, aOwner);
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return StringEnumeratorTail(aResult);
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}
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NS_COM nsresult
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NS_NewUTF8StringEnumerator(nsIUTF8StringEnumerator** aResult,
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const nsTArray<nsCString>* aArray, nsISupports* aOwner)
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{
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NS_ENSURE_ARG_POINTER(aResult);
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NS_ENSURE_ARG_POINTER(aArray);
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*aResult = new nsStringEnumerator(aArray, aOwner);
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return StringEnumeratorTail(aResult);
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}
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NS_COM nsresult
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NS_NewAdoptingStringEnumerator(nsIStringEnumerator** aResult,
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nsTArray<nsString>* aArray)
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{
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NS_ENSURE_ARG_POINTER(aResult);
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NS_ENSURE_ARG_POINTER(aArray);
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*aResult = new nsStringEnumerator(aArray, PR_TRUE);
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return StringEnumeratorTail(aResult);
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}
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NS_COM nsresult
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NS_NewAdoptingUTF8StringEnumerator(nsIUTF8StringEnumerator** aResult,
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nsTArray<nsCString>* aArray)
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{
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NS_ENSURE_ARG_POINTER(aResult);
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NS_ENSURE_ARG_POINTER(aArray);
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*aResult = new nsStringEnumerator(aArray, PR_TRUE);
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return StringEnumeratorTail(aResult);
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}
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// const ones internally just forward to the non-const equivalents
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NS_COM nsresult
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NS_NewStringEnumerator(nsIStringEnumerator** aResult,
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const nsTArray<nsString>* aArray)
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{
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NS_ENSURE_ARG_POINTER(aResult);
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NS_ENSURE_ARG_POINTER(aArray);
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*aResult = new nsStringEnumerator(aArray, PR_FALSE);
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return StringEnumeratorTail(aResult);
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}
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NS_COM nsresult
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NS_NewUTF8StringEnumerator(nsIUTF8StringEnumerator** aResult,
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const nsTArray<nsCString>* aArray)
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{
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NS_ENSURE_ARG_POINTER(aResult);
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NS_ENSURE_ARG_POINTER(aArray);
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*aResult = new nsStringEnumerator(aArray, PR_FALSE);
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return StringEnumeratorTail(aResult);
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}
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