00001 /* 00002 * IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING. By 00003 * downloading, copying, installing or using the software you agree to 00004 * this license. If you do not agree to this license, do not download, 00005 * install, copy or use the software. 00006 * 00007 * Intel Open Source License 00008 * 00009 * Copyright (c) 2005 Intel Corporation. All rights reserved. 00010 * 00011 * Redistribution and use in source and binary forms, with or without 00012 * modification, are permitted provided that the following conditions are 00013 * met: 00014 * 00015 * Redistributions of source code must retain the above copyright 00016 * notice, this list of conditions and the following disclaimer. 00017 * 00018 * Redistributions in binary form must reproduce the above copyright 00019 * notice, this list of conditions and the following disclaimer in the 00020 * documentation and/or other materials provided with the distribution. 00021 * 00022 * Neither the name of the Intel Corporation nor the names of its 00023 * contributors may be used to endorse or promote products derived from 00024 * this software without specific prior written permission. 00025 * 00026 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 00027 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 00028 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 00029 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE INTEL OR 00030 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 00031 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 00032 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 00033 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 00034 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 00035 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 00036 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 00037 */ 00038 00039 00040 #ifndef __OASYS_DURABLE_STORE_INTERNAL_HEADER__ 00041 #error DurableIterator.h must only be included from within DurableStore.h 00042 #endif 00043 00044 00049 class DurableIterator { 00050 public: 00051 // virtual destructor 00052 virtual ~DurableIterator() {} 00053 00076 virtual int next() = 0; 00077 00081 virtual int get_key(SerializableObject* key) = 0; 00082 }; 00083 00084 //---------------------------------------------------------------------------- 00091 template<typename _filter> 00092 class DurableFilterIterator : public DurableIterator { 00093 public: 00094 DurableFilterIterator(DurableIterator* itr) 00095 : itr_(itr) {} 00096 00097 // virtual from DurableIterator 00098 int next() 00099 { 00100 for (;;) 00101 { 00102 int ret = itr_->next(); 00103 if (ret != DS_OK) { 00104 return ret; 00105 } 00106 00107 if (_filter::accept(itr_)) { 00108 return DS_OK; 00109 } 00110 } 00111 } 00112 00113 int get_key(SerializableObject* key) 00114 { 00115 return itr_->get_key(key); 00116 } 00117 00118 private: 00119 DurableIterator* itr_; 00120 };