gecko/xpcom/ds/nsStringEnumerator.cpp

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla 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/MPL/
 *
 * 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 String Enumerator.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corp.
 * Portions created by the Initial Developer are Copyright (C) 2003
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Alec Flett <alecf@netscape.com>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */


#include "nsStringEnumerator.h"
#include "prtypes.h"
#include "nsCRT.h"
#include "nsString.h"
#include "nsReadableUtils.h"
#include "nsISimpleEnumerator.h"
#include "nsSupportsPrimitives.h"

//
// nsStringEnumerator
//

NS_IMETHODIMP
nsStringEnumerator::HasMore(PRBool* aResult)
{
    NS_ENSURE_ARG_POINTER(aResult);
    *aResult = mIndex < Count();
    return NS_OK;
}

NS_IMETHODIMP
nsStringEnumerator::HasMoreElements(PRBool* aResult)
{
    return HasMore(aResult);
}

NS_IMETHODIMP
nsStringEnumerator::GetNext(nsISupports** aResult)
{
    if (mIsUnicode) {
        nsSupportsStringImpl* stringImpl = new nsSupportsStringImpl();
        if (!stringImpl) return NS_ERROR_OUT_OF_MEMORY;
        
        stringImpl->SetData(*mArray->StringAt(mIndex++));
        *aResult = stringImpl;
    }
    else {
        nsSupportsCStringImpl* cstringImpl = new nsSupportsCStringImpl();
        if (!cstringImpl) return NS_ERROR_OUT_OF_MEMORY;

        cstringImpl->SetData(*mCArray->CStringAt(mIndex++));
        *aResult = cstringImpl;
    }
    NS_ADDREF(*aResult);
    return NS_OK;
}

NS_IMETHODIMP
nsStringEnumerator::GetNext(nsAString& aResult)
{
    NS_ENSURE_TRUE(mIndex < Count(), NS_ERROR_UNEXPECTED);

    if (mIsUnicode)
        aResult = *mArray->StringAt(mIndex++);
    else
        CopyUTF8toUTF16(*mCArray->CStringAt(mIndex++), aResult);
    
    return NS_OK;
}

NS_IMETHODIMP
nsStringEnumerator::GetNext(nsACString& aResult)
{
    NS_ENSURE_TRUE(mIndex < Count(), NS_ERROR_UNEXPECTED);
    
    if (mIsUnicode)
        CopyUTF16toUTF8(*mArray->StringAt(mIndex++), aResult);
    else
        aResult = *mCArray->CStringAt(mIndex++);
    
    return NS_OK;
}

template<class T>
static inline nsresult
StringEnumeratorTail(T** aResult)
{
    if (!*aResult)
        return NS_ERROR_OUT_OF_MEMORY;
    NS_ADDREF(*aResult);
    return NS_OK;
}

//
// constructors
//

NS_COM nsresult
NS_NewStringEnumerator(nsIStringEnumerator** aResult,
                       const nsStringArray* aArray, nsISupports* aOwner)
{
    NS_ENSURE_ARG_POINTER(aResult);
    NS_ENSURE_ARG_POINTER(aArray);
    
    *aResult = new nsStringEnumerator(aArray, aOwner);
    return StringEnumeratorTail(aResult);
}


NS_COM nsresult
NS_NewUTF8StringEnumerator(nsIUTF8StringEnumerator** aResult,
                           const nsCStringArray* aArray, nsISupports* aOwner)
{
    NS_ENSURE_ARG_POINTER(aResult);
    NS_ENSURE_ARG_POINTER(aArray);
    
    *aResult = new nsStringEnumerator(aArray, aOwner);
    return StringEnumeratorTail(aResult);
}

NS_COM nsresult
NS_NewAdoptingStringEnumerator(nsIStringEnumerator** aResult,
                               nsStringArray* aArray)
{
    NS_ENSURE_ARG_POINTER(aResult);
    NS_ENSURE_ARG_POINTER(aArray);
    
    *aResult = new nsStringEnumerator(aArray, PR_TRUE);
    return StringEnumeratorTail(aResult);
}

NS_COM nsresult
NS_NewAdoptingUTF8StringEnumerator(nsIUTF8StringEnumerator** aResult,
                                   nsCStringArray* aArray)
{
    NS_ENSURE_ARG_POINTER(aResult);
    NS_ENSURE_ARG_POINTER(aArray);
    
    *aResult = new nsStringEnumerator(aArray, PR_TRUE);
    return StringEnumeratorTail(aResult);
}

// const ones internally just forward to the non-const equivalents
NS_COM nsresult
NS_NewStringEnumerator(nsIStringEnumerator** aResult,
                       const nsStringArray* aArray)
{
    NS_ENSURE_ARG_POINTER(aResult);
    NS_ENSURE_ARG_POINTER(aArray);
    
    *aResult = new nsStringEnumerator(aArray, PR_FALSE);
    return StringEnumeratorTail(aResult);
}

NS_COM nsresult
NS_NewUTF8StringEnumerator(nsIUTF8StringEnumerator** aResult,
                           const nsCStringArray* aArray)
{
    NS_ENSURE_ARG_POINTER(aResult);
    NS_ENSURE_ARG_POINTER(aArray);
    
    *aResult = new nsStringEnumerator(aArray, PR_FALSE);
    return StringEnumeratorTail(aResult);
}