79 lines
2.5 KiB
Go
79 lines
2.5 KiB
Go
// Licensed to Elasticsearch B.V. under one or more contributor
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// license agreements. See the NOTICE file distributed with
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// this work for additional information regarding copyright
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// ownership. Elasticsearch B.V. licenses this file to you under
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// the Apache License, Version 2.0 (the "License"); you may
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// 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,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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package feature
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// FilterFunc is the function use to filter elements from a bundle.
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type FilterFunc = func(Featurable) bool
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// Bundleable merges featurable and bundle interface together.
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type bundleable interface {
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Features() []Featurable
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}
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// Bundle defines a list of features available in the current beat.
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type Bundle struct {
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features []Featurable
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}
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// NewBundle creates a new Bundle of feature to be registered.
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func NewBundle(features ...Featurable) *Bundle {
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return &Bundle{features: features}
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}
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// FilterWith takes a predicate and return a list of filtered bundle matching the predicate.
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func (b *Bundle) FilterWith(pred FilterFunc) *Bundle {
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var filtered []Featurable
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for _, feature := range b.features {
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if pred(feature) {
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filtered = append(filtered, feature)
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}
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}
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return NewBundle(filtered...)
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}
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// Filter creates a new bundle with only the feature matching the requested stability.
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func (b *Bundle) Filter(stabilities ...Stability) *Bundle {
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return b.FilterWith(HasStabilityPred(stabilities...))
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}
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// Features returns the interface features slice so
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func (b *Bundle) Features() []Featurable {
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return b.features
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}
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// MustBundle takes existing bundle or features and create a new Bundle with all the merged Features.
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func MustBundle(bundle ...bundleable) *Bundle {
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var merged []Featurable
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for _, feature := range bundle {
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merged = append(merged, feature.Features()...)
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}
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return NewBundle(merged...)
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}
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// HasStabilityPred returns true if the feature match any of the provided stabilities.
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func HasStabilityPred(stabilities ...Stability) FilterFunc {
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return func(f Featurable) bool {
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for _, s := range stabilities {
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if s == f.Description().Stability() {
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return true
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}
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}
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return false
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}
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}
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