| 1 | /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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| 2 | /* ***** BEGIN LICENSE BLOCK *****
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| 3 | * Version: MPL 1.1/GPL 2.0/LGPL 2.1
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| 4 | *
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| 5 | * The contents of this file are subject to the Mozilla Public License Version
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| 6 | * 1.1 (the "License"); you may not use this file except in compliance with
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| 7 | * the License. You may obtain a copy of the License at
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| 8 | * http://www.mozilla.org/MPL/
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| 9 | *
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| 10 | * Software distributed under the License is distributed on an "AS IS" basis,
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| 11 | * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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| 12 | * for the specific language governing rights and limitations under the
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| 13 | * License.
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| 14 | *
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| 15 | * The Original Code is mozilla.org code.
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| 16 | *
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| 17 | * The Initial Developer of the Original Code is
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| 18 | * Netscape Communications Corporation.
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| 19 | * Portions created by the Initial Developer are Copyright (C) 1998
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| 20 | * the Initial Developer. All Rights Reserved.
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| 21 | *
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| 22 | * Contributor(s):
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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 of the GNU General Public License Version 2 or later (the "GPL"),
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| 26 | * or 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 | #include "nsSupportsArrayEnumerator.h"
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| 39 | #include "nsISupportsArray.h"
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| 40 |
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| 41 | nsSupportsArrayEnumerator::nsSupportsArrayEnumerator(nsISupportsArray* array)
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| 42 | : mArray(array), mCursor(0)
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| 43 | {
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| 44 | NS_ASSERTION(array, "null array");
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| 45 | NS_ADDREF(mArray);
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| 46 | }
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| 47 |
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| 48 | nsSupportsArrayEnumerator::~nsSupportsArrayEnumerator()
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| 49 | {
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| 50 | NS_RELEASE(mArray);
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| 51 | }
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| 52 |
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| 53 | NS_IMPL_ISUPPORTS2(nsSupportsArrayEnumerator, nsIBidirectionalEnumerator, nsIEnumerator)
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| 54 |
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| 55 | NS_IMETHODIMP
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| 56 | nsSupportsArrayEnumerator::First()
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| 57 | {
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| 58 | mCursor = 0;
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| 59 | PRUint32 cnt;
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| 60 | nsresult rv = mArray->Count(&cnt);
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| 61 | if (NS_FAILED(rv)) return rv;
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| 62 | PRInt32 end = (PRInt32)cnt;
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| 63 | if (mCursor < end)
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| 64 | return NS_OK;
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| 65 | else
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| 66 | return NS_ERROR_FAILURE;
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| 67 | }
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| 68 |
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| 69 | NS_IMETHODIMP
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| 70 | nsSupportsArrayEnumerator::Next()
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| 71 | {
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| 72 | PRUint32 cnt;
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| 73 | nsresult rv = mArray->Count(&cnt);
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| 74 | if (NS_FAILED(rv)) return rv;
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| 75 | PRInt32 end = (PRInt32)cnt;
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| 76 | if (mCursor < end) // don't count upward forever
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| 77 | mCursor++;
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| 78 | if (mCursor < end)
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| 79 | return NS_OK;
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| 80 | else
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| 81 | return NS_ERROR_FAILURE;
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| 82 | }
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| 83 |
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| 84 | NS_IMETHODIMP
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| 85 | nsSupportsArrayEnumerator::CurrentItem(nsISupports **aItem)
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| 86 | {
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| 87 | NS_ASSERTION(aItem, "null out parameter");
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| 88 | PRUint32 cnt;
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| 89 | nsresult rv = mArray->Count(&cnt);
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| 90 | if (NS_FAILED(rv)) return rv;
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| 91 | if (mCursor >= 0 && mCursor < (PRInt32)cnt) {
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| 92 | *aItem = mArray->ElementAt(mCursor);
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| 93 | return NS_OK;
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| 94 | }
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| 95 | return NS_ERROR_FAILURE;
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| 96 | }
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| 97 |
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| 98 | NS_IMETHODIMP
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| 99 | nsSupportsArrayEnumerator::IsDone()
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| 100 | {
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| 101 | PRUint32 cnt;
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| 102 | nsresult rv = mArray->Count(&cnt);
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| 103 | if (NS_FAILED(rv)) return rv;
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| 104 | return (mCursor >= 0 && mCursor < (PRInt32)cnt)
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| 105 | ? NS_ENUMERATOR_FALSE : NS_OK;
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| 106 | }
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| 107 |
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| 108 | ////////////////////////////////////////////////////////////////////////////////
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| 109 |
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| 110 | NS_IMETHODIMP
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| 111 | nsSupportsArrayEnumerator::Last()
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| 112 | {
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| 113 | PRUint32 cnt;
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| 114 | nsresult rv = mArray->Count(&cnt);
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| 115 | if (NS_FAILED(rv)) return rv;
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| 116 | mCursor = cnt - 1;
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| 117 | return NS_OK;
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| 118 | }
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| 119 |
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| 120 | NS_IMETHODIMP
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| 121 | nsSupportsArrayEnumerator::Prev()
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| 122 | {
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| 123 | if (mCursor >= 0)
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| 124 | --mCursor;
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| 125 | if (mCursor >= 0)
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| 126 | return NS_OK;
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| 127 | else
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| 128 | return NS_ERROR_FAILURE;
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| 129 | }
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| 130 |
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| 131 | ////////////////////////////////////////////////////////////////////////////////
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| 132 |
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| 133 | NS_COM nsresult
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| 134 | NS_NewISupportsArrayEnumerator(nsISupportsArray* array,
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| 135 | nsIBidirectionalEnumerator* *aInstancePtrResult)
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| 136 | {
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| 137 | if (aInstancePtrResult == 0)
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| 138 | return NS_ERROR_NULL_POINTER;
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| 139 | nsSupportsArrayEnumerator* e = new nsSupportsArrayEnumerator(array);
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| 140 | if (e == 0)
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| 141 | return NS_ERROR_OUT_OF_MEMORY;
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| 142 | NS_ADDREF(e);
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| 143 | *aInstancePtrResult = e;
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| 144 | return NS_OK;
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| 145 | }
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| 146 |
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| 147 | ////////////////////////////////////////////////////////////////////////////////
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| 148 |
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