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// Copyright 2017 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 COMPONENTS_ZUCCHINI_TARGET_POOL_H_
#define COMPONENTS_ZUCCHINI_TARGET_POOL_H_
#include <stddef.h>
#include <vector>
#include "components/zucchini/image_utils.h"
#include "components/zucchini/patch_reader.h"
namespace zucchini {
class OffsetMapper;
class TargetSource;
// Ordered container of distinct targets that have the same semantics, along
// with a list of associated reference types, only used during patch generation.
class TargetPool {
public:
using const_iterator = std::vector<offset_t>::const_iterator;
TargetPool();
// Initializes the object with given sorted and unique |targets|.
explicit TargetPool(std::vector<offset_t>&& targets);
TargetPool(TargetPool&&);
TargetPool(const TargetPool&);
~TargetPool();
// Insert new targets from various sources. These invalidate all previous key
// lookups.
// - From a list of targets, useful for adding extra targets in Zucchini-gen:
void InsertTargets(const std::vector<offset_t>& targets);
// - From TargetSource, useful for adding extra targets in Zucchini-apply:
void InsertTargets(TargetSource* targets);
// - From list of References, useful for listing targets in Zucchini-gen:
void InsertTargets(const std::vector<Reference>& references);
// - From ReferenceReader, useful for listing targets in Zucchini-apply:
void InsertTargets(ReferenceReader&& references);
// Adds |type| as a reference type associated with the pool of targets.
void AddType(TypeTag type) { types_.push_back(type); }
// Returns a canonical key associated with a valid target at |offset|.
key_t KeyForOffset(offset_t offset) const;
// Returns a canonical key associated with the target nearest to |offset|.
key_t KeyForNearestOffset(offset_t offset) const;
// Returns the target for a |key|, which is assumed to be valid and held by
// this class.
offset_t OffsetForKey(key_t key) const { return targets_[key]; }
// Returns whether a particular key is valid.
bool KeyIsValid(key_t key) const { return key < targets_.size(); }
// Uses |offset_mapper| to transform "old" |targets_| to "new" |targets_|,
// resulting in sorted and unique targets.
void FilterAndProject(const OffsetMapper& offset_mapper);
// Accessors for testing.
const std::vector<offset_t>& targets() const { return targets_; }
const std::vector<TypeTag>& types() const { return types_; }
// Returns the number of targets.
size_t size() const { return targets_.size(); }
const_iterator begin() const { return targets_.cbegin(); }
const_iterator end() const { return targets_.cend(); }
private:
std::vector<TypeTag> types_; // Enumerates type_tag for this pool.
std::vector<offset_t> targets_; // Targets for pool in ascending order.
};
} // namespace zucchini
#endif // COMPONENTS_ZUCCHINI_TARGET_POOL_H_
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