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Annotation of XNU/libkern/c++/OSCollectionIterator.cpp, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /* IOArray.h created by rsulack on Thu 11-Sep-1997 */
        !            23: 
        !            24: #include <libkern/c++/OSCollectionIterator.h>
        !            25: #include <libkern/c++/OSCollection.h>
        !            26: #include <libkern/c++/OSArray.h>
        !            27: #include <libkern/c++/OSLib.h>
        !            28: 
        !            29: #define super OSIterator
        !            30: 
        !            31: OSDefineMetaClassAndStructors(OSCollectionIterator, OSIterator)
        !            32: 
        !            33: #ifdef DEBUG
        !            34: extern "C" {
        !            35:     extern int debug_container_malloc_size;
        !            36: };
        !            37: #define ACCUMSIZE(s) do { debug_container_malloc_size += (s); } while(0)
        !            38: #else
        !            39: #define ACCUMSIZE(s)
        !            40: #endif
        !            41: 
        !            42: bool OSCollectionIterator::initWithCollection(OSCollection *inColl)
        !            43: {
        !            44:     if ( !super::init() || !inColl)
        !            45:         return false;
        !            46: 
        !            47:     inColl->retain();
        !            48:     collection = inColl;
        !            49:     collIterator = 0;
        !            50:     arrayReturn = 0;
        !            51:     initialUpdateStamp = 0;
        !            52:     valid = false;
        !            53: 
        !            54:     return this;
        !            55: }
        !            56: 
        !            57: OSCollectionIterator *
        !            58: OSCollectionIterator::withCollection(OSCollection *inColl)
        !            59: {
        !            60: 
        !            61:     OSCollectionIterator *me = new OSCollectionIterator;
        !            62: 
        !            63:     if (me && !me->initWithCollection(inColl)) {
        !            64:         me->free();
        !            65:         return 0;
        !            66:     }
        !            67: 
        !            68:     return me;
        !            69: }
        !            70: 
        !            71: void OSCollectionIterator::free()
        !            72: {
        !            73:     if (arrayReturn) {
        !            74:         arrayReturn->release();
        !            75:         arrayReturn = 0;
        !            76:     }
        !            77: 
        !            78:     if (collIterator) {
        !            79:         kfree((vm_offset_t)collIterator, collection->iteratorSize());
        !            80:        ACCUMSIZE(-(collection->iteratorSize()));
        !            81:         collIterator = 0;
        !            82:     }
        !            83: 
        !            84:     if (collection) {
        !            85:         collection->release();
        !            86:         collection = 0;
        !            87:     }
        !            88: 
        !            89:     super::free();
        !            90: }
        !            91: 
        !            92: void OSCollectionIterator::reset()
        !            93: {
        !            94:     valid = false;
        !            95: 
        !            96:     if (!collIterator) {
        !            97:         collIterator = (void *)kalloc(collection->iteratorSize());
        !            98:        ACCUMSIZE(collection->iteratorSize());
        !            99:         if (!collIterator)
        !           100:             return;
        !           101:     }
        !           102: 
        !           103:     if (!collection->initIterator(collIterator))
        !           104:         return;
        !           105: 
        !           106:     initialUpdateStamp = collection->updateStamp;
        !           107:     valid = true;
        !           108: }
        !           109: 
        !           110: bool OSCollectionIterator::isValid()
        !           111: {
        !           112:     if (!collIterator) {
        !           113:         collIterator = (void *)kalloc(collection->iteratorSize());
        !           114:        ACCUMSIZE(collection->iteratorSize());
        !           115:         if (!collection->initIterator(collIterator))
        !           116:             return false;
        !           117:         initialUpdateStamp = collection->updateStamp;
        !           118:         valid = true;
        !           119:     }
        !           120:     else if (!valid || collection->updateStamp != initialUpdateStamp)
        !           121:         return false;
        !           122:     
        !           123:     return true;
        !           124: }
        !           125: 
        !           126: OSObject *OSCollectionIterator::getNextObject()
        !           127: {
        !           128:     OSObject *retObj;
        !           129:     bool retVal;
        !           130: 
        !           131:     if (!isValid())
        !           132:         return 0;
        !           133: 
        !           134:     retVal = collection->getNextObjectForIterator(collIterator, &retObj);
        !           135:     return (retVal)? retObj : 0;
        !           136: }
        !           137: 

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