58 lines
2.1 KiB
Go
58 lines
2.1 KiB
Go
// Copyright 2024 PingCAP, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package expropt
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import (
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"github.com/pingcap/tidb/pkg/expression/exprctx"
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)
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// SequenceOperator is the interface for to operate sequence.
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type SequenceOperator interface {
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// GetSequenceID gets the sequence id.
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GetSequenceID() int64
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// GetSequenceNextVal gets the next value of the sequence.
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GetSequenceNextVal() (int64, error)
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// SetSequenceVal sets the sequence value.
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// The returned bool indicates the newVal is already under the base.
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SetSequenceVal(newVal int64) (int64, bool, error)
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}
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var _ exprctx.OptionalEvalPropProvider = SequenceOperatorProvider(nil)
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// SequenceOperatorProvider is the function to provide SequenceOperator.
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type SequenceOperatorProvider func(db, name string) (SequenceOperator, error)
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// Desc returns the description for the property key.
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func (SequenceOperatorProvider) Desc() *exprctx.OptionalEvalPropDesc {
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return exprctx.OptPropSequenceOperator.Desc()
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}
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// SequenceOperatorPropReader is used by expression to get SequenceOperator.
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type SequenceOperatorPropReader struct{}
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// RequiredOptionalEvalProps implements the RequireOptionalEvalProps interface.
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func (SequenceOperatorPropReader) RequiredOptionalEvalProps() exprctx.OptionalEvalPropKeySet {
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return exprctx.OptPropSequenceOperator.AsPropKeySet()
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}
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// GetSequenceOperator returns a SequenceOperator.
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func (SequenceOperatorPropReader) GetSequenceOperator(ctx exprctx.EvalContext, db, name string) (SequenceOperator, error) {
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p, err := getPropProvider[SequenceOperatorProvider](ctx, exprctx.OptPropSequenceOperator)
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if err != nil {
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return nil, err
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}
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return p(db, name)
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}
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