80 lines
2.1 KiB
C++
80 lines
2.1 KiB
C++
//
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// Copyright (C) 2012 The Android Open Source Project
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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#ifndef SHILL_PROPERTY_ITERATOR_H_
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#define SHILL_PROPERTY_ITERATOR_H_
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#include <map>
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#include <string>
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#include "shill/accessor_interface.h"
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#include "shill/error.h"
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namespace shill {
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// An iterator wrapper class to hide the details of what kind of data structure
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// we're using to store key/value pairs for properties. It is intended for use
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// with PropertyStore and always advances to the next readable property.
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template <class V>
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class ReadablePropertyConstIterator {
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public:
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~ReadablePropertyConstIterator() {}
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bool AtEnd() const { return it_ == collection_.end(); }
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void Advance() {
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if (!AtEnd()) {
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do {
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++it_;
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} while (MustAdvance());
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}
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}
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const std::string& Key() const { return it_->first; }
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const V& value() const { return value_; }
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private:
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friend class PropertyStore;
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typedef std::shared_ptr<AccessorInterface<V>> VAccessorPtr;
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explicit ReadablePropertyConstIterator(
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const typename std::map<std::string, VAccessorPtr>& collection)
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: collection_(collection),
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it_(collection_.begin()),
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value_() {
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if (MustAdvance()) {
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Advance();
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}
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}
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bool MustAdvance() { return !AtEnd() && !RetrieveCurrentValue(); }
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bool RetrieveCurrentValue() {
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Error error;
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value_ = it_->second->Get(&error);
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return error.IsSuccess();
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}
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const typename std::map<std::string, VAccessorPtr>& collection_;
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typename std::map<std::string, VAccessorPtr>::const_iterator it_;
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V value_;
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};
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} // namespace shill
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#endif // SHILL_PROPERTY_ITERATOR_H_
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