1 | /* ***** BEGIN LICENSE BLOCK *****
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2 | * Version: MPL 1.1/GPL 2.0/LGPL 2.1
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3 | *
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4 | * The contents of this file are subject to the Mozilla Public License Version
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5 | * 1.1 (the "License"); you may not use this file except in compliance with
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6 | * the License. You may obtain a copy of the License at
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7 | * http://www.mozilla.org/MPL/
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8 | *
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9 | * Software distributed under the License is distributed on an "AS IS" basis,
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10 | * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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11 | * for the specific language governing rights and limitations under the
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12 | * License.
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13 | *
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14 | * The Original Code is the Python XPCOM language bindings.
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15 | *
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16 | * The Initial Developer of the Original Code is
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17 | * ActiveState Tool Corp.
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18 | * Portions created by the Initial Developer are Copyright (C) 2000
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19 | * the Initial Developer. All Rights Reserved.
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20 | *
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21 | * Contributor(s):
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22 | * Mark Hammond <MarkH@ActiveState.com> (original author)
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23 | *
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24 | * Alternatively, the contents of this file may be used under the terms of
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25 | * either the GNU General Public License Version 2 or later (the "GPL"), or
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26 | * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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27 | * in which case the provisions of the GPL or the LGPL are applicable instead
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28 | * of those above. If you wish to allow use of your version of this file only
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29 | * under the terms of either the GPL or the LGPL, and not to allow others to
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30 | * use your version of this file under the terms of the MPL, indicate your
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31 | * decision by deleting the provisions above and replace them with the notice
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32 | * and other provisions required by the GPL or the LGPL. If you do not delete
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33 | * the provisions above, a recipient may use your version of this file under
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34 | * the terms of any one of the MPL, the GPL or the LGPL.
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35 | *
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36 | * ***** END LICENSE BLOCK ***** */
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37 |
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38 | //
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39 | // This code is part of the XPCOM extensions for Python.
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40 | //
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41 | // Written May 2000 by Mark Hammond.
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42 | //
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43 | // Based heavily on the Python COM support, which is
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44 | // (c) Mark Hammond and Greg Stein.
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45 | //
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46 | // (c) 2000, ActiveState corp.
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47 |
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48 | #include "PyXPCOM_std.h"
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49 | #include <nsIEnumerator.h>
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50 |
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51 | static nsIEnumerator *GetI(PyObject *self) {
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52 | nsIID iid = NS_GET_IID(nsIEnumerator);
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53 |
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54 | if (!Py_nsISupports::Check(self, iid)) {
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55 | PyErr_SetString(PyExc_TypeError, "This object is not the correct interface");
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56 | return NULL;
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57 | }
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58 | return (nsIEnumerator *)Py_nsISupports::GetI(self);
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59 | }
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60 |
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61 | static PyObject *PyFirst(PyObject *self, PyObject *args)
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62 | {
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63 | if (!PyArg_ParseTuple(args, ":First"))
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64 | return NULL;
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65 |
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66 | nsIEnumerator *pI = GetI(self);
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67 | if (pI==NULL)
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68 | return NULL;
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69 |
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70 | nsresult r;
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71 | Py_BEGIN_ALLOW_THREADS;
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72 | r = pI->First();
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73 | Py_END_ALLOW_THREADS;
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74 | return PyInt_FromLong(r);
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75 | }
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76 |
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77 | static PyObject *PyNext(PyObject *self, PyObject *args)
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78 | {
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79 | if (!PyArg_ParseTuple(args, ":Next"))
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80 | return NULL;
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81 |
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82 | nsIEnumerator *pI = GetI(self);
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83 | if (pI==NULL)
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84 | return NULL;
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85 |
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86 | nsresult r;
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87 | Py_BEGIN_ALLOW_THREADS;
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88 | r = pI->Next();
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89 | Py_END_ALLOW_THREADS;
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90 | return PyInt_FromLong(r);
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91 | }
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92 |
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93 | static PyObject *PyCurrentItem(PyObject *self, PyObject *args)
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94 | {
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95 | PyObject *obIID = NULL;
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96 | if (!PyArg_ParseTuple(args, "|O:CurrentItem", &obIID))
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97 | return NULL;
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98 |
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99 | nsIID iid(NS_GET_IID(nsISupports));
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100 | if (obIID != NULL && !Py_nsIID::IIDFromPyObject(obIID, &iid))
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101 | return NULL;
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102 | nsIEnumerator *pI = GetI(self);
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103 | if (pI==NULL)
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104 | return NULL;
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105 |
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106 | nsISupports *pRet = nsnull;
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107 | nsresult r;
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108 | Py_BEGIN_ALLOW_THREADS;
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109 | r = pI->CurrentItem(&pRet);
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110 | Py_END_ALLOW_THREADS;
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111 | if ( NS_FAILED(r) )
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112 | return PyXPCOM_BuildPyException(r);
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113 | if (obIID) {
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114 | nsISupports *temp;
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115 | Py_BEGIN_ALLOW_THREADS;
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116 | r = pRet->QueryInterface(iid, (void **)&temp);
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117 | pRet->Release();
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118 | Py_END_ALLOW_THREADS;
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119 | if ( NS_FAILED(r) ) {
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120 | return PyXPCOM_BuildPyException(r);
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121 | }
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122 | pRet = temp;
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123 | }
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124 | PyObject *ret = Py_nsISupports::PyObjectFromInterface(pRet, iid);
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125 | NS_IF_RELEASE(pRet);
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126 | return ret;
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127 | }
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128 |
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129 | // A method added for Python performance if you really need
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130 | // it. Allows you to fetch a block of objects in one
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131 | // hit, allowing the loop to remain implemented in C.
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132 | static PyObject *PyFetchBlock(PyObject *self, PyObject *args)
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133 | {
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134 | PyObject *obIID = NULL;
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135 | int n_wanted;
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136 | int n_fetched = 0;
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137 | if (!PyArg_ParseTuple(args, "i|O:FetchBlock", &n_wanted, &obIID))
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138 | return NULL;
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139 |
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140 | nsIID iid(NS_GET_IID(nsISupports));
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141 | if (obIID != NULL && !Py_nsIID::IIDFromPyObject(obIID, &iid))
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142 | return NULL;
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143 | nsIEnumerator *pI = GetI(self);
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144 | if (pI==NULL)
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145 | return NULL;
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146 |
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147 | // We want to fetch with the thread-lock released,
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148 | // but this means we can not append to the PyList
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149 | nsISupports **fetched = new nsISupports*[n_wanted];
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150 | if (fetched==nsnull) {
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151 | PyErr_NoMemory();
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152 | return NULL;
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153 | }
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154 | memset(fetched, 0, sizeof(nsISupports *) * n_wanted);
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155 | nsresult r = NS_OK;
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156 | Py_BEGIN_ALLOW_THREADS;
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157 | for (;n_fetched<n_wanted;) {
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158 | nsISupports *pNew;
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159 | r = pI->CurrentItem(&pNew);
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160 | if (NS_FAILED(r)) {
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161 | r = 0; // Normal enum end
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162 | break;
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163 | }
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164 | if (obIID) {
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165 | nsISupports *temp;
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166 | r = pNew->QueryInterface(iid, (void **)&temp);
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167 | pNew->Release();
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168 | if ( NS_FAILED(r) ) {
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169 | break;
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170 | }
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171 | pNew = temp;
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172 | }
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173 | fetched[n_fetched] = pNew;
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174 | n_fetched++; // must increment before breaking out.
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175 | if (NS_FAILED(pI->Next()))
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176 | break; // not an error condition.
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177 | }
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178 | Py_END_ALLOW_THREADS;
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179 | PyObject *ret;
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180 | if (NS_SUCCEEDED(r)) {
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181 | ret = PyList_New(n_fetched);
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182 | if (ret)
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183 | for (int i=0;i<n_fetched;i++) {
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184 | PyObject *new_ob = Py_nsISupports::PyObjectFromInterface(fetched[i], iid);
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185 | NS_IF_RELEASE(fetched[i]);
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186 | PyList_SET_ITEM(ret, i, new_ob);
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187 | }
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188 | } else
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189 | ret = PyXPCOM_BuildPyException(r);
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190 |
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191 | if ( ret == NULL ) {
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192 | // Free the objects we consumed.
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193 | for (int i=0;i<n_fetched;i++)
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194 | fetched[i]->Release();
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195 |
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196 | }
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197 | delete [] fetched;
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198 | return ret;
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199 | }
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200 |
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201 | static PyObject *PyIsDone(PyObject *self, PyObject *args)
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202 | {
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203 | if (!PyArg_ParseTuple(args, ":IsDone"))
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204 | return NULL;
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205 |
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206 | nsIEnumerator *pI = GetI(self);
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207 | nsresult r;
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208 | if (pI==NULL)
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209 | return NULL;
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210 |
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211 | Py_BEGIN_ALLOW_THREADS;
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212 | r = pI->IsDone();
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213 | Py_END_ALLOW_THREADS;
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214 | if (NS_FAILED(r))
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215 | return PyXPCOM_BuildPyException(r);
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216 | PyObject *ret = r==NS_OK ? Py_True : Py_False;
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217 | Py_INCREF(ret);
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218 | return ret;
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219 | }
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220 |
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221 | struct PyMethodDef
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222 | PyMethods_IEnumerator[] =
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223 | {
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224 | { "First", PyFirst, 1},
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225 | { "first", PyFirst, 1},
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226 | { "Next", PyNext, 1},
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227 | { "next", PyNext, 1},
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228 | { "CurrentItem", PyCurrentItem, 1},
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229 | { "currentItem", PyCurrentItem, 1},
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230 | { "IsDone", PyIsDone, 1},
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231 | { "isDone", PyIsDone, 1},
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232 | { "FetchBlock", PyFetchBlock, 1},
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233 | { "fetchBlock", PyFetchBlock, 1},
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234 | {NULL}
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235 | };
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