DurableIterator.h

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00001 /*
00002  *    Copyright 2005-2006 Intel Corporation
00003  * 
00004  *    Licensed under the Apache License, Version 2.0 (the "License");
00005  *    you may not use this file except in compliance with the License.
00006  *    You may obtain a copy of the License at
00007  * 
00008  *        http://www.apache.org/licenses/LICENSE-2.0
00009  * 
00010  *    Unless required by applicable law or agreed to in writing, software
00011  *    distributed under the License is distributed on an "AS IS" BASIS,
00012  *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00013  *    See the License for the specific language governing permissions and
00014  *    limitations under the License.
00015  */
00016 
00017 
00018 
00019 #ifndef __OASYS_DURABLE_STORE_INTERNAL_HEADER__
00020 #error DurableIterator.h must only be included from within DurableStore.h
00021 #endif
00022 
00023 
00028 class DurableIterator {
00029 public:
00030     // virtual destructor
00031     virtual ~DurableIterator() {}
00032 
00055     virtual int next() = 0;
00056 
00060     virtual int get_key(SerializableObject* key) = 0;
00061 };
00062 
00063 //----------------------------------------------------------------------------
00070 template<typename _filter>
00071 class DurableFilterIterator : public DurableIterator {
00072 public:
00073     DurableFilterIterator(DurableIterator* itr)
00074         : itr_(itr) {}
00075 
00076     // virtual from DurableIterator
00077     int next() 
00078     {
00079         for (;;) 
00080         {
00081             int ret = itr_->next();
00082             if (ret != DS_OK) {
00083                 return ret;
00084             }
00085             
00086             if (_filter::accept(itr_)) {
00087                 return DS_OK;
00088             }
00089         }
00090     }
00091 
00092     int get_key(SerializableObject* key) 
00093     {
00094         return itr_->get_key(key);
00095     }
00096     
00097 private:
00098     DurableIterator* itr_;
00099 };

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