| // Copyright (C) 2015 The Android Open Source Project |
| // |
| // Licensed 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 builder |
| |
| import ( |
| "fmt" |
| |
| "android.googlesource.com/platform/tools/gpu/database" |
| "android.googlesource.com/platform/tools/gpu/log" |
| "android.googlesource.com/platform/tools/gpu/service/path" |
| ) |
| |
| // BuildLazy resolves and returns the link on the object represented by the |
| // specified path. |
| func (r *Follow) BuildLazy(ctx log.Context, c interface{}, d database.Database) (interface{}, error) { |
| obj, err := database.Build(ctx, &Get{Path: r.Path}, d) |
| if err != nil { |
| return nil, err |
| } |
| linker, ok := obj.(path.Linker) |
| if !ok { |
| return nil, &path.ErrNotFollowable{Path: r.Path} |
| } |
| link, err := linker.Link(ctx, r.Path, d) |
| if err != nil { |
| return link, err |
| } |
| if link == nil { |
| return nil, fmt.Errorf("Following path %v gave a nil link", r.Path) |
| } |
| if err := link.Validate(); err != nil { |
| return nil, fmt.Errorf("Following path %v gave an invalid link %v: %v", |
| r.Path, link, err) |
| } |
| return link, nil |
| } |