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map.go
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map.go
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// Copyright 2024 Google LLC
//
// 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 mappings
import "reflect"
// typeMapping is a mapping from one type to another.
type typeMapping interface {
// FromType returns the type we will convert from
FromType() reflect.Type
// ToType returns the type we will convert to.
ToType() reflect.Type
// Map performs the actual conversion from one value to another.
Map(in *point, out *point) error
}
// structTypeMapping is a typeMapping for mapping between struct fields
type structTypeMapping struct {
//scope is the parent Mapping context of which we are part.
scope *Mapping
// inType is the type we will convert from.
inType *reflectType
// outType is the type we will convert to.
outType *reflectType
// hasSpecStatus is a hint for validation that this mapping is a top-level mapping.
hasSpecStatus bool
// fields defines the mapping of fields
fields []*fieldMapping
// ignore is a list of fields we should ignore.
// This is kept around for validation.
ignore []*ignoreField
}
var _ typeMapping = &structTypeMapping{}
// FromType implements typeMapping
func (m *structTypeMapping) FromType() reflect.Type {
return m.inType.rt
}
// ToType implements typeMapping
func (m *structTypeMapping) ToType() reflect.Type {
return m.outType.rt
}
// fieldMapping describes the field we should read in the input, and write in the output.
// In future, we could add value transformations here, but we haven't needed one yet.
type fieldMapping struct {
InPath *fieldPath
OutPath *fieldPath
}
// Map implements typeMapping
func (m *structTypeMapping) Map(in *point, out *point) error {
for _, mapping := range m.fields {
inPoint := mapping.InPath.FindPoint(in)
srcVal := inPoint.GetValue()
if err := mapping.OutPath.SetValue(out, srcVal); err != nil {
return err
}
}
return nil
}