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// Copyright 2022 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef THIRD_PARTY_CEL_CPP_BASE_ATTRIBUTE_SET_H_
#define THIRD_PARTY_CEL_CPP_BASE_ATTRIBUTE_SET_H_
#include "absl/container/btree_set.h"
#include "absl/types/span.h"
#include "base/attribute.h"
namespace google::api::expr::runtime {
class AttributeUtility;
} // namespace google::api::expr::runtime
namespace cel {
class UnknownValue;
namespace base_internal {
class UnknownSet;
}
// AttributeSet is a container for CEL attributes that are identified as
// unknown during expression evaluation.
class AttributeSet final {
private:
using Container = absl::btree_set<Attribute>;
public:
using value_type = typename Container::value_type;
using size_type = typename Container::size_type;
using iterator = typename Container::const_iterator;
using const_iterator = typename Container::const_iterator;
AttributeSet() = default;
AttributeSet(const AttributeSet&) = default;
AttributeSet(AttributeSet&&) = default;
AttributeSet& operator=(const AttributeSet&) = default;
AttributeSet& operator=(AttributeSet&&) = default;
explicit AttributeSet(absl::Span<const Attribute> attributes) {
for (const auto& attr : attributes) {
Add(attr);
}
}
AttributeSet(const AttributeSet& set1, const AttributeSet& set2)
: attributes_(set1.attributes_) {
for (const auto& attr : set2.attributes_) {
Add(attr);
}
}
iterator begin() const { return attributes_.begin(); }
const_iterator cbegin() const { return attributes_.cbegin(); }
iterator end() const { return attributes_.end(); }
const_iterator cend() const { return attributes_.cend(); }
size_type size() const { return attributes_.size(); }
bool empty() const { return attributes_.empty(); }
bool operator==(const AttributeSet& other) const {
return this == &other || attributes_ == other.attributes_;
}
bool operator!=(const AttributeSet& other) const {
return !operator==(other);
}
static AttributeSet Merge(const AttributeSet& set1,
const AttributeSet& set2) {
return AttributeSet(set1, set2);
}
private:
friend class google::api::expr::runtime::AttributeUtility;
friend class UnknownValue;
friend class base_internal::UnknownSet;
void Add(const Attribute& attribute) { attributes_.insert(attribute); }
void Add(const AttributeSet& other) {
for (const auto& attribute : other) {
Add(attribute);
}
}
// Attribute container.
Container attributes_;
};
} // namespace cel
#endif // THIRD_PARTY_CEL_CPP_BASE_ATTRIBUTE_SET_H_