forked from apache/beam
/
util.go
57 lines (47 loc) · 2.17 KB
/
util.go
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// Licensed to the Apache Software Foundation (ASF) under one or more
// contributor license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright ownership.
// The ASF licenses this file to You 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.
// We use the almost vestigial util_gen.tmpl to be able to similarly generate all
// the same function identifiers more easily for shim generation.
// The generate statements live here since `go:generate` operates in filename order,
// and this is the last file in the package.
//go:generate specialize --input=util_gen.tmpl --x=integers,floats
//go:generate gofmt -w util_gen.go
//go:generate go generate util_gen.go
package stats
import (
"fmt"
"reflect"
"github.com/apache/beam/sdks/go/pkg/beam"
"github.com/apache/beam/sdks/go/pkg/beam/core/util/reflectx"
)
func combine(s beam.Scope, makeCombineFn func(reflect.Type) interface{}, col beam.PCollection) beam.PCollection {
t := beam.ValidateNonCompositeType(col)
validateNonComplexNumber(t.Type())
// Do a pipeline-construction-time type switch to select the right
// runtime operation.
return beam.Combine(s, makeCombineFn(t.Type()), col)
}
func combinePerKey(s beam.Scope, makeCombineFn func(reflect.Type) interface{}, col beam.PCollection) beam.PCollection {
_, t := beam.ValidateKVType(col)
validateNonComplexNumber(t.Type())
// Do a pipeline-construction-time type switch to select the right
// runtime operation.
return beam.CombinePerKey(s, makeCombineFn(t.Type()), col)
}
func validateNonComplexNumber(t reflect.Type) {
if !reflectx.IsNumber(t) || reflectx.IsComplex(t) {
panic(fmt.Sprintf("type must be a non-complex number: %v", t))
}
}