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1fef312102
- move strings into constants - remove unnecessary interface - fix documentation - improve error messaging
69 lines
2.1 KiB
Go
69 lines
2.1 KiB
Go
/*
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Copyright 2017 The Kubernetes Authors.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package apply
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// Strategy implements a strategy for merging recorded, local and remote values contained
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// in an element and returns the merged result.
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// Follows the visitor pattern
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type Strategy interface {
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// MergeList is invoked by ListElements when Merge is called
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MergeList(ListElement) (Result, error)
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// MergeMap is invoked by MapElements when Merge is called
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MergeMap(MapElement) (Result, error)
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// MergeType is invoked by TypeElements when Merge is called
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MergeType(TypeElement) (Result, error)
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// MergePrimitive is invoked by PrimitiveElements when Merge is called
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MergePrimitive(PrimitiveElement) (Result, error)
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// MergeEmpty is invoked by EmptyElements when Merge is called
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MergeEmpty(EmptyElement) (Result, error)
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}
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// Operation records whether a field should be set or dropped
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type Operation int
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const (
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// ERROR is an error during merge
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ERROR Operation = iota
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// SET sets the field on an object
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SET
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// DROP drops the field from an object
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DROP
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)
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// Result is the result of merging fields
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type Result struct {
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// Operation is the operation that should be performed for the merged field
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Operation Operation
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// MergedResult is the new merged value
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MergedResult interface{}
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}
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const (
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// MergeStrategy is the strategy to merge the local and remote values
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MergeStrategy = "merge"
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// RetainKeysStrategy is the strategy to merge the local and remote values, but drop any fields not defined locally
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RetainKeysStrategy = "retainKeys"
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// ReplaceStrategy is the strategy to replace the remote value with the local value
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ReplaceStrategy = "replace"
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)
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