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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_AUTOCOMPLETE_HISTORY_CONTENTS_PROVIDER_H__
#define CHROME_BROWSER_AUTOCOMPLETE_HISTORY_CONTENTS_PROVIDER_H__
#include "chrome/browser/autocomplete/autocomplete.h"
#include "chrome/browser/history/history.h"
// HistoryContentsProvider is an AutocompleteProvider that provides results from
// the contents (body and/or title) of previously visited pages. Results are
// obtained asynchronously from the history service.
class HistoryContentsProvider : public AutocompleteProvider {
public:
HistoryContentsProvider(ACProviderListener* listener, Profile* profile)
: AutocompleteProvider(listener, profile, "HistoryContents"),
history_service_(NULL),
have_results_(false) {
DCHECK(profile);
}
#ifdef UNIT_TEST
HistoryContentsProvider(ACProviderListener* listener,
HistoryService* history_service)
: AutocompleteProvider(listener, NULL, "HistoryContents"),
history_service_(history_service),
have_results_(false) {
}
#endif
// As necessary asks the history service for the relevant results. When
// done SetResults is invoked.
virtual void Start(const AutocompleteInput& input,
bool minimal_changes,
bool synchronous_only);
virtual void Stop();
// Returns the total number of matches available in the database, up to
// kMaxMatchCount, whichever is smaller.
// Return value is only valid if done() returns true.
size_t db_match_count() const { return db_match_count_; }
// The maximum match count we'll report. If the db_match_count is greater
// than this, it will be clamped to this result.
static const int kMaxMatchCount = 50;
private:
void QueryComplete(HistoryService::Handle handle,
history::QueryResults* results);
// Converts each MatchingPageResult in results_ to an AutocompleteMatch and
// adds it to matches_.
void ConvertResults();
// Creates and returns an AutocompleteMatch from a MatchingPageResult.
AutocompleteMatch ResultToMatch(const history::URLResult& result,
int score);
// Adds ACMatchClassifications to match from the offset positions in
// page_result.
void ClassifyDescription(const history::URLResult& result,
AutocompleteMatch* match) const;
// Calculates and returns the relevance of a particular result. See the
// chart in autocomplete.h for the list of values this returns.
int CalculateRelevance(const history::URLResult& result);
CancelableRequestConsumerT<int, 0> request_consumer_;
// This is only non-null for testing, otherwise the HistoryService from the
// Profile is used.
HistoryService* history_service_;
// The number of times we're returned each different type of result. These are
// used by CalculateRelevance. Initialized in Start.
int star_title_count_;
int star_contents_count_;
int title_count_;
int contents_count_;
// Current autocomplete input type.
AutocompleteInput::Type input_type_;
// Results from most recent query. These are cached so we don't have to
// re-issue queries for "minor changes" (which don't affect this provider).
history::QueryResults results_;
// Whether results_ is valid (so we can tell invalid apart from empty).
bool have_results_;
// Current query string.
std::wstring query_;
// Total number of matches available in the database.
int db_match_count_;
DISALLOW_EVIL_CONSTRUCTORS(HistoryContentsProvider);
};
#endif // CHROME_BROWSER_AUTOCOMPLETE_HISTORY_CONTENTS_PROVIDER_H__
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