DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Header

Mercurial (b66b287a2650)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239
/* -*- 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 XPCOM Array implementation.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corp.
 * Portions created by the Initial Developer are Copyright (C) 2002
 * 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 "nsArray.h"
#include "nsArrayEnumerator.h"
#include "nsWeakReference.h"
#include "nsThreadUtils.h"

// used by IndexOf()
struct findIndexOfClosure
{
    nsISupports *targetElement;
    PRUint32 startIndex;
    PRUint32 resultIndex;
};

static PRBool FindElementCallback(void* aElement, void* aClosure);

NS_INTERFACE_MAP_BEGIN(nsArray)
  NS_INTERFACE_MAP_ENTRY(nsIArray)
  NS_INTERFACE_MAP_ENTRY(nsIMutableArray)
  NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIMutableArray)
NS_INTERFACE_MAP_END

NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsArrayCC)
  NS_INTERFACE_MAP_ENTRY(nsIArray)
  NS_INTERFACE_MAP_ENTRY(nsIMutableArray)
  NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIMutableArray)
NS_INTERFACE_MAP_END

nsArray::~nsArray()
{
    Clear();
}


NS_IMPL_ADDREF(nsArray)
NS_IMPL_RELEASE(nsArray)

NS_IMPL_CYCLE_COLLECTING_ADDREF(nsArrayCC)
NS_IMPL_CYCLE_COLLECTING_RELEASE(nsArrayCC)

NS_IMPL_CYCLE_COLLECTION_CLASS(nsArrayCC)
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsArrayCC)
    tmp->Clear();
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsArrayCC)
    NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMARRAY(mArray)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END

NS_IMETHODIMP
nsArray::GetLength(PRUint32* aLength)
{
    *aLength = mArray.Count();
    return NS_OK;
}

NS_IMETHODIMP
nsArray::QueryElementAt(PRUint32 aIndex,
                        const nsIID& aIID,
                        void ** aResult)
{
    nsISupports * obj = mArray.SafeObjectAt(aIndex);
    if (!obj) return NS_ERROR_ILLEGAL_VALUE;

    // no need to worry about a leak here, because SafeObjectAt() 
    // doesn't addref its result
    return obj->QueryInterface(aIID, aResult);
}

NS_IMETHODIMP
nsArray::IndexOf(PRUint32 aStartIndex, nsISupports* aElement,
                 PRUint32* aResult)
{
    // optimize for the common case by forwarding to mArray
    if (aStartIndex == 0) {
        PRUint32 idx = mArray.IndexOf(aElement);
        if (idx == PR_UINT32_MAX)
            return NS_ERROR_FAILURE;

        *aResult = idx;
        return NS_OK;
    }

    findIndexOfClosure closure = { aElement, aStartIndex, 0 };
    PRBool notFound = mArray.EnumerateForwards(FindElementCallback, &closure);
    if (notFound)
        return NS_ERROR_FAILURE;

    *aResult = closure.resultIndex;
    return NS_OK;
}

NS_IMETHODIMP
nsArray::Enumerate(nsISimpleEnumerator **aResult)
{
    return NS_NewArrayEnumerator(aResult, static_cast<nsIArray*>(this));
}

// nsIMutableArray implementation

NS_IMETHODIMP
nsArray::AppendElement(nsISupports* aElement, PRBool aWeak)
{
    PRBool result;
    if (aWeak) {
        nsCOMPtr<nsISupports> elementRef =
            getter_AddRefs(static_cast<nsISupports*>
                                      (NS_GetWeakReference(aElement)));
        NS_ASSERTION(elementRef, "AppendElement: Trying to use weak references on an object that doesn't support it");
        if (!elementRef)
            return NS_ERROR_FAILURE;
        result = mArray.AppendObject(elementRef);
    }

    else {
        // add the object directly
        result = mArray.AppendObject(aElement);
    }
    return result ? NS_OK : NS_ERROR_FAILURE;
}

NS_IMETHODIMP
nsArray::RemoveElementAt(PRUint32 aIndex)
{
    PRBool result = mArray.RemoveObjectAt(aIndex);
    return result ? NS_OK : NS_ERROR_FAILURE;
}

NS_IMETHODIMP
nsArray::InsertElementAt(nsISupports* aElement, PRUint32 aIndex, PRBool aWeak)
{
    nsCOMPtr<nsISupports> elementRef;
    if (aWeak) {
        elementRef =
            getter_AddRefs(static_cast<nsISupports*>
                                      (NS_GetWeakReference(aElement)));
        NS_ASSERTION(elementRef, "InsertElementAt: Trying to use weak references on an object that doesn't support it");
        if (!elementRef)
            return NS_ERROR_FAILURE;
    } else {
        elementRef = aElement;
    }
    PRBool result = mArray.InsertObjectAt(elementRef, aIndex);
    return result ? NS_OK : NS_ERROR_FAILURE;
}

NS_IMETHODIMP
nsArray::ReplaceElementAt(nsISupports* aElement, PRUint32 aIndex, PRBool aWeak)
{
    nsCOMPtr<nsISupports> elementRef;
    if (aWeak) {
        elementRef =
            getter_AddRefs(static_cast<nsISupports*>
                                      (NS_GetWeakReference(aElement)));
        NS_ASSERTION(elementRef, "ReplaceElementAt: Trying to use weak references on an object that doesn't support it");
        if (!elementRef)
            return NS_ERROR_FAILURE;
    } else {
        elementRef = aElement;
    }
    PRBool result = mArray.ReplaceObjectAt(elementRef, aIndex);
    return result ? NS_OK : NS_ERROR_FAILURE;
}

NS_IMETHODIMP
nsArray::Clear()
{
    mArray.Clear();
    return NS_OK;
}

//
// static helper routines
//
PRBool
FindElementCallback(void *aElement, void* aClosure)
{
    findIndexOfClosure* closure =
        static_cast<findIndexOfClosure*>(aClosure);

    nsISupports* element =
        static_cast<nsISupports*>(aElement);
    
    // don't start searching until we're past the startIndex
    if (closure->resultIndex >= closure->startIndex &&
        element == closure->targetElement) {
        return PR_FALSE;    // stop! We found it
    }
    closure->resultIndex++;

    return PR_TRUE;
}

NS_METHOD nsArrayConstructor(nsISupports *aOuter, const nsIID& aIID, void **aResult) {
    if (aOuter)
        return NS_ERROR_NO_AGGREGATION;

    nsCOMPtr<nsIArray> inst = NS_IsMainThread() ? new nsArrayCC : new nsArray;
    if (!inst)
        return NS_ERROR_OUT_OF_MEMORY;

    return inst->QueryInterface(aIID, aResult); 
}