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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.
module Gandiva
class ExpressionBuilder
class If
def initialize(condition)
@condition = condition
@then = nil
@else = nil
end
def then(clause)
@then = clause
self
end
def else(clause)
@else = clause
self
end
def elsif(condition)
Elsif.new(self, condition)
end
def build
build_if_node(condition_node,
then_node,
else_node)
end
protected
def condition_node
@condition.build
end
def then_node
@then&.build
end
def else_node
@else&.build
end
private
def build_if_node(condition_node, then_node, else_node)
if then_node and else_node
# TODO: Validate then_node.return_type == else_node.return_type
return_type = then_node.return_type
else
return_type = (then_node || else_node).return_type
end
IfNode.new(condition_node,
then_node,
else_node,
return_type)
end
end
end
end
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