| // 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. |
| |
| package beam |
| |
| import ( |
| "github.com/apache/beam/sdks/go/pkg/beam/core/graph" |
| "github.com/apache/beam/sdks/go/pkg/beam/core/graph/window" |
| "github.com/apache/beam/sdks/go/pkg/beam/internal/errors" |
| ) |
| |
| // WindowInto applies the windowing strategy to each element. |
| func WindowInto(s Scope, ws *window.Fn, col PCollection) PCollection { |
| return Must(TryWindowInto(s, ws, col)) |
| } |
| |
| // TryWindowInto attempts to insert a WindowInto transform. |
| func TryWindowInto(s Scope, ws *window.Fn, col PCollection) (PCollection, error) { |
| if !s.IsValid() { |
| return PCollection{}, errors.New("invalid scope") |
| } |
| if !col.IsValid() { |
| return PCollection{}, errors.New("invalid input pcollection") |
| } |
| |
| edge := graph.NewWindowInto(s.real, s.scope, ws, col.n) |
| ret := PCollection{edge.Output[0].To} |
| return ret, nil |
| } |