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// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_HISTORY_VISITSEGMENT_DATABASE_H__
#define CHROME_BROWSER_HISTORY_VISITSEGMENT_DATABASE_H__
#include "base/basictypes.h"
#include "chrome/browser/history/history_types.h"
class PageUsageData;
struct sqlite3;
class SqliteStatementCache;
namespace history {
// Tracks pages used for the most visited view.
class VisitSegmentDatabase {
public:
// Must call InitSegmentTables before using any other part of this class.
VisitSegmentDatabase();
virtual ~VisitSegmentDatabase();
// Compute a segment name given a URL. The segment name is currently the
// source url spec less some information such as query strings.
static std::string ComputeSegmentName(const GURL& url);
// Returns the ID of the segment with the corresponding name, or 0 if there
// is no segment with that name.
SegmentID GetSegmentNamed(const std::string& segment_name);
// Update the segment identified by |out_segment_id| with the provided URL ID.
// The URL identifies the page that will now represent the segment. If url_id
// is non zero, it is assumed to be the row id of |url|.
bool UpdateSegmentRepresentationURL(SegmentID segment_id,
URLID url_id);
// Return the ID of the URL currently used to represent this segment or 0 if
// an error occured.
URLID GetSegmentRepresentationURL(SegmentID segment_id);
// Create a segment for the provided URL ID with the given name. Returns the
// ID of the newly created segment, or 0 on failure.
SegmentID CreateSegment(URLID url_id, const std::string& segment_name);
// Increase the segment visit count by the provided amount. Return true on
// success.
bool IncreaseSegmentVisitCount(SegmentID segment_id, const base::Time& ts,
int amount);
// Compute the segment usage since |from_time| using the provided aggregator.
// A PageUsageData is added in |result| for the nine highest-scored segments.
void QuerySegmentUsage(const base::Time& from_time,
std::vector<PageUsageData*>* result);
// Delete all the segment usage data which is older than the provided time
// stamp.
void DeleteSegmentData(const base::Time& older_than);
// Change the presentation id for the segment identified by |segment_id|
void SetSegmentPresentationIndex(SegmentID segment_id, int index);
// Delete the segment currently using the provided url for representation.
// This will also delete any associated segment usage data.
bool DeleteSegmentForURL(URLID url_id);
protected:
// Returns the database and statement cache for the functions in this
// interface. The decendent of this class implements these functions to
// return its objects.
virtual sqlite3* GetDB() = 0;
virtual SqliteStatementCache& GetStatementCache() = 0;
// Creates the tables used by this class if necessary. Returns true on
// success.
bool InitSegmentTables();
// Deletes all the segment tables, returning true on success.
bool DropSegmentTables();
private:
DISALLOW_EVIL_CONSTRUCTORS(VisitSegmentDatabase);
};
} // namespace history
#endif // CHROME_BROWSER_HISTORY_VISITSEGMENT_DATABASE_H__
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