52 lines
1.5 KiB
Go
52 lines
1.5 KiB
Go
// Copyright 2014 Google Inc. All Rights Reserved.
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//
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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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//
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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, 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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package sampling
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type autoFilterSampler struct {
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// filter will run to remove elements before adding every observation
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filter func(d interface{}) bool
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sampler Sampler
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}
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func (self *autoFilterSampler) Len() int {
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return self.sampler.Len()
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}
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func (self *autoFilterSampler) Reset() {
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self.sampler.Reset()
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}
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func (self *autoFilterSampler) Map(f func(d interface{})) {
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self.sampler.Map(f)
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}
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func (self *autoFilterSampler) Filter(filter func(d interface{}) bool) {
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self.sampler.Filter(filter)
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}
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func (self *autoFilterSampler) Update(d interface{}) {
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self.Filter(self.filter)
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self.sampler.Update(d)
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}
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// Add a decorator for sampler. Whenever an Update() is called, the sampler will
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// call filter() first to remove elements in the decorated sampler.
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func NewAutoFilterSampler(sampler Sampler, filter func(d interface{}) bool) Sampler {
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return &autoFilterSampler{
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filter: filter,
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sampler: sampler,
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}
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}
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