123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869 |
- /*
- Copyright 2017 The Kubernetes Authors.
- 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
- 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.
- */
- package apply
- // Strategy implements a strategy for merging recorded, local and remote values contained
- // in an element and returns the merged result.
- // Follows the visitor pattern
- type Strategy interface {
- // MergeList is invoked by ListElements when Merge is called
- MergeList(ListElement) (Result, error)
- // MergeMap is invoked by MapElements when Merge is called
- MergeMap(MapElement) (Result, error)
- // MergeType is invoked by TypeElements when Merge is called
- MergeType(TypeElement) (Result, error)
- // MergePrimitive is invoked by PrimitiveElements when Merge is called
- MergePrimitive(PrimitiveElement) (Result, error)
- // MergeEmpty is invoked by EmptyElements when Merge is called
- MergeEmpty(EmptyElement) (Result, error)
- }
- // Operation records whether a field should be set or dropped
- type Operation int
- const (
- // ERROR is an error during merge
- ERROR Operation = iota
- // SET sets the field on an object
- SET
- // DROP drops the field from an object
- DROP
- )
- // Result is the result of merging fields
- type Result struct {
- // Operation is the operation that should be performed for the merged field
- Operation Operation
- // MergedResult is the new merged value
- MergedResult interface{}
- }
- const (
- // MergeStrategy is the strategy to merge the local and remote values
- MergeStrategy = "merge"
- // RetainKeysStrategy is the strategy to merge the local and remote values, but drop any fields not defined locally
- RetainKeysStrategy = "retainKeys"
- // ReplaceStrategy is the strategy to replace the remote value with the local value
- ReplaceStrategy = "replace"
- )
|