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/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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
*
* http://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 ORC_EXPRESSIONTREE_HH
#define ORC_EXPRESSIONTREE_HH
#include "orc/sargs/TruthValue.hh"
#include <limits>
#include <memory>
#include <string>
#include <vector>
static const size_t UNUSED_LEAF = std::numeric_limits<size_t>::max();
namespace orc {
class ExpressionTree;
typedef std::shared_ptr<ExpressionTree> TreeNode;
typedef std::initializer_list<TreeNode> NodeList;
/**
* The inner representation of the SearchArgument. Most users should not
* need this interface, it is only for file formats that need to translate
* the SearchArgument into an internal form.
*/
class ExpressionTree {
public:
enum class Operator { OR, AND, NOT, LEAF, CONSTANT };
ExpressionTree(Operator op);
ExpressionTree(Operator op, std::initializer_list<TreeNode> children);
ExpressionTree(size_t leaf);
ExpressionTree(TruthValue constant);
ExpressionTree(const ExpressionTree& other);
ExpressionTree& operator=(const ExpressionTree&) = delete;
Operator getOperator() const;
const std::vector<TreeNode>& getChildren() const;
std::vector<TreeNode>& getChildren();
const TreeNode getChild(size_t i) const;
TreeNode getChild(size_t i);
TruthValue getConstant() const;
size_t getLeaf() const;
void setLeaf(size_t leaf);
void addChild(TreeNode child);
std::string toString() const;
TruthValue evaluate(const std::vector<TruthValue>& leaves) const;
private:
Operator operator_;
std::vector<TreeNode> children_;
size_t leaf_;
TruthValue constant_;
};
} // namespace orc
#endif // ORC_EXPRESSIONTREE_HH
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