80 lines
2.0 KiB
Go
80 lines
2.0 KiB
Go
/*
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Copyright 2018 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 selectors
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import (
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p "k8s.io/kubectl/pkg/framework/path/predicates"
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)
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// Slice is a "slice selector". It selects values as slices (if
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// possible) and filters those slices based on the "filtered"
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// predicates.
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type Slice interface {
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// Slice can be used as a Interface predicate. If the selector
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// can't select any slice from the value, then the predicate is
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// false.
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p.Interface
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// SelectFrom finds slices from values using this selector. The
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// list can be bigger or smaller than the initial lists,
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// depending on the select criterias.
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SelectFrom(...interface{}) [][]interface{}
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// Filter will create a new Slice that filters only the values
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// who match the predicate.
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Filter(...p.Slice) Slice
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}
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// Slice creates a selector that takes values and filters them into
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// slices if possible.
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func AsSlice() Slice {
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return &sliceS{}
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}
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type sliceS struct {
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vs Interface
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sp p.Slice
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}
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func (s *sliceS) SelectFrom(interfaces ...interface{}) [][]interface{} {
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if s.vs != nil {
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interfaces = s.vs.SelectFrom(interfaces...)
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}
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slices := [][]interface{}{}
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for _, value := range interfaces {
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slice, ok := value.([]interface{})
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if !ok {
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continue
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}
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if s.sp != nil && !s.sp.Match(slice) {
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continue
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}
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slices = append(slices, slice)
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}
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return slices
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}
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func (s *sliceS) Filter(sps ...p.Slice) Slice {
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return &sliceS{vs: s.vs, sp: p.SliceAnd(append(sps, s.sp)...)}
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}
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func (s *sliceS) Match(value interface{}) bool {
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return len(s.SelectFrom(value)) != 0
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}
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