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// Copyright (c) 2012 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_QUICK_PROVIDER_H_
#define CHROME_BROWSER_AUTOCOMPLETE_HISTORY_QUICK_PROVIDER_H_
#pragma once
#include <string>
#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "chrome/browser/autocomplete/autocomplete_input.h"
#include "chrome/browser/autocomplete/autocomplete_match.h"
#include "chrome/browser/autocomplete/history_provider.h"
#include "chrome/browser/history/history_types.h"
#include "chrome/browser/history/in_memory_url_index.h"
class Profile;
class TermMatches;
namespace history {
struct ScoredHistoryMatch;
} // namespace history
// This class is an autocomplete provider (a pseudo-internal component of
// the history system) which quickly (and synchronously) provides matching
// results from recently or frequently visited sites in the profile's
// history.
class HistoryQuickProvider : public HistoryProvider {
public:
HistoryQuickProvider(AutocompleteProviderListener* listener,
Profile* profile);
// AutocompleteProvider. |minimal_changes| is ignored since there is no asynch
// completion performed.
virtual void Start(const AutocompleteInput& input,
bool minimal_changes) OVERRIDE;
virtual void DeleteMatch(const AutocompleteMatch& match) OVERRIDE;
// Disable this provider. For unit testing purposes only. This is required
// because this provider is closely associated with the HistoryURLProvider
// and in order to properly test the latter the HistoryQuickProvider must
// be disabled.
// TODO(mrossetti): Eliminate this once the HUP has been refactored.
static void set_disabled(bool disabled) { disabled_ = disabled; }
private:
friend class HistoryQuickProviderTest;
FRIEND_TEST_ALL_PREFIXES(HistoryQuickProviderTest, Spans);
FRIEND_TEST_ALL_PREFIXES(HistoryQuickProviderTest, Relevance);
virtual ~HistoryQuickProvider();
// Performs the autocomplete matching and scoring.
void DoAutocomplete();
// Creates an AutocompleteMatch from |history_match|, assigning it
// the score |score|.
AutocompleteMatch QuickMatchToACMatch(
const history::ScoredHistoryMatch& history_match,
int score);
// Returns the index that should be used for history lookups.
history::InMemoryURLIndex* GetIndex();
// Fill and return an ACMatchClassifications structure given the term
// matches (|matches|) to highlight where terms were found.
static ACMatchClassifications SpansFromTermMatch(
const history::TermMatches& matches,
size_t text_length,
bool is_url);
// Only for use in unittests. Takes ownership of |index|.
void set_index(history::InMemoryURLIndex* index) {
index_for_testing_.reset(index);
}
AutocompleteInput autocomplete_input_;
std::string languages_;
// True if we're allowed to reorder results depending on
// inlineability in order to assign higher relevance scores.
// Consider a case where ScoredHistoryMatch provides results x and
// y, where x is not inlineable and has a score of 3000 and y is
// inlineable and has a score of 2500. If reorder_for_inlining_ is
// false, then x gets demoted to a non-inlineable score (1199) and y
// gets demoted to a lower score (1198) because we try to preserve
// the order. On the other hand, if reorder_for_inlining_ is true,
// then y keeps its score of 2500 and x gets demoted to 2499 in
// order to follow y. There will not be any problems with an
// unexpected inline because the non-inlineable result x scores
// lower than the inlineable one.
// TODO(mpearson): remove this variable after we're done experimenting.
// (This member is meant to only exist for experimentation purposes.
// Once we know which behavior is better, we should rip out this variable
// and make the best behavior the default.)
bool reorder_for_inlining_;
// Only used for testing.
scoped_ptr<history::InMemoryURLIndex> index_for_testing_;
// This provider is disabled when true.
static bool disabled_;
DISALLOW_COPY_AND_ASSIGN(HistoryQuickProvider);
};
#endif // CHROME_BROWSER_AUTOCOMPLETE_HISTORY_QUICK_PROVIDER_H_
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