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/*
* Copyright 2009, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
// Iterator over persisted metrics
#ifndef O3D_STATSREPORT_PERSISTENT_ITERATOR_WIN32_H__
#define O3D_STATSREPORT_PERSISTENT_ITERATOR_WIN32_H__
#include <atlbase.h>
#include <atlstr.h>
#include <iterator>
#include "base/scoped_ptr.h"
#include "metrics.h"
#include "const-win32.h"
namespace stats_report {
// Forward iterator for persisted metrics
class PersistentMetricsIteratorWin32
: public std::iterator<std::forward_iterator_tag, const MetricBase *> {
public:
// @param app_name see MetricsAggregatorWin32
explicit PersistentMetricsIteratorWin32(const wchar_t *app_name)
: state_(kUninitialized),
is_machine_(false) {
key_name_.Format(kStatsKeyFormatString, app_name);
Next();
}
// @param app_name see MetricsAggregatorWin32
// @param is_machine specifies the registry hive
PersistentMetricsIteratorWin32(const wchar_t *app_name, bool is_machine)
: state_(kUninitialized),
is_machine_(is_machine) {
key_name_.Format(kStatsKeyFormatString, app_name);
Next();
}
// Constructs the at-end iterator
PersistentMetricsIteratorWin32() : state_(kUninitialized) {
}
MetricBase *operator* () {
return Current();
}
MetricBase *operator-> () {
return Current();
}
// Preincrement, we don't implement postincrement because we don't
// want to deal with making iterators copyable, comparable etc.
PersistentMetricsIteratorWin32 &operator++() {
Next();
return (*this);
}
// Compare for equality with o.
bool equals(const PersistentMetricsIteratorWin32 &o) const {
// compare equal to self, and end iterators compare equal
if ((this == &o) || (NULL == current_value_.get() &&
NULL == o.current_value_.get()))
return true;
return false;
}
private:
MetricBase *Current() {
DCHECK(current_value_.get());
return current_value_.get();
}
enum IterationState {
kUninitialized,
kCounts,
kTimings,
kIntegers,
kBooleans,
kFinished,
};
// Walk to the next key/value under iteration
void Next();
// Keeps track of which subkey we're iterating over
IterationState state_;
// The full path from HKCU to the key we iterate over
CString key_name_;
// The top-level key we're iterating over, valid only
// after first call to Next().
CRegKey key_;
// The subkey we're currently enumerating over
CRegKey sub_key_;
// Current value we're indexing over
DWORD value_index_;
// Name of the value under the iterator
CStringA current_value_name_;
// The metric under the iterator
scoped_ptr<MetricBase> current_value_;
// Specifies HKLM or HKCU, respectively.
bool is_machine_;
};
inline bool operator == (const PersistentMetricsIteratorWin32 &a,
const PersistentMetricsIteratorWin32 &b) {
return a.equals(b);
}
inline bool operator != (const PersistentMetricsIteratorWin32 &a,
const PersistentMetricsIteratorWin32 &b) {
return !a.equals(b);
}
} // namespace stats_report
#endif // O3D_STATSREPORT_PERSISTENT_ITERATOR_WIN32_H__
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