The Tor Browser: content/xul/templates/src/nsXULTemplateResultSetRDF.cpp@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */

     2 /* This Source Code Form is subject to the terms of the Mozilla Public

     3  * License, v. 2.0. If a copy of the MPL was not distributed with this

     4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     6 #include "nsXULTemplateResultSetRDF.h"

     7 #include "nsXULTemplateQueryProcessorRDF.h"

     9 NS_IMPL_ISUPPORTS(nsXULTemplateResultSetRDF, nsISimpleEnumerator)

    11 NS_IMETHODIMP

    12 nsXULTemplateResultSetRDF::HasMoreElements(bool *aResult)

    13 {

    14     *aResult = true;

    16     nsCOMPtr<nsIRDFNode> node;

    18     if (! mInstantiations || ! mQuery) {

    19         *aResult = false;

    20         return NS_OK;

    21     }

    23     if (mCheckedNext) {

    24         if (!mCurrent || mCurrent == &(mInstantiations->mHead))

    25             *aResult = false;

    26         return NS_OK;

    27     }

    29     mCheckedNext = true;

    31     do {

    32         if (mCurrent) {

    33             mCurrent = mCurrent->mNext;

    34             if (mCurrent == &(mInstantiations->mHead)) {

    35                 *aResult = false;

    36                 return NS_OK;

    37             }

    38         }

    39         else {

    40             *aResult = ! mInstantiations->Empty();

    41             if (*aResult)

    42                 mCurrent = mInstantiations->mHead.mNext;

    43         }

    45         // get the value of the member variable. If it is not set, skip

    46         // the result and move on to the next result

    47         if (mCurrent) {

    48             mCurrent->mInstantiation.mAssignments.

    49                 GetAssignmentFor(mQuery->mMemberVariable, getter_AddRefs(node));

    50         }

    52         // only resources may be used as results

    53         mResource = do_QueryInterface(node);

    54     } while (! mResource);

    56     return NS_OK;

    57 }

    59 NS_IMETHODIMP

    60 nsXULTemplateResultSetRDF::GetNext(nsISupports **aResult)

    61 {

    62     if (!aResult)

    63         return NS_ERROR_NULL_POINTER;

    65     if (!mCurrent || !mCheckedNext)

    66         return NS_ERROR_FAILURE;

    68     nsRefPtr<nsXULTemplateResultRDF> nextresult =

    69         new nsXULTemplateResultRDF(mQuery, mCurrent->mInstantiation, mResource);

    70     if (!nextresult)

    71         return NS_ERROR_OUT_OF_MEMORY;

    73     // add the supporting memory elements to the processor's map. These are

    74     // used to remove the results when an assertion is removed from the graph

    75     mProcessor->AddMemoryElements(mCurrent->mInstantiation, nextresult);

    77     mCheckedNext = false;

    79     *aResult = nextresult;

    80     NS_ADDREF(*aResult);

    82     return NS_OK;

    83 }

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