| // Copyright 2016 Google Inc. All rights reserved. |
| // |
| // 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 blueprint |
| |
| import ( |
| "bytes" |
| "io" |
| "io/ioutil" |
| "os" |
| ) |
| |
| // Based on Andrew Gerrand's "10 things you (probably) dont' know about Go" |
| |
| var fs fileSystem = osFS{} |
| |
| type fileSystem interface { |
| Open(name string) (io.ReadCloser, error) |
| Exists(name string) (bool, bool, error) |
| } |
| |
| // osFS implements fileSystem using the local disk. |
| type osFS struct{} |
| |
| func (osFS) Open(name string) (io.ReadCloser, error) { return os.Open(name) } |
| func (osFS) Exists(name string) (bool, bool, error) { |
| stat, err := os.Stat(name) |
| if err == nil { |
| return true, stat.IsDir(), nil |
| } else if os.IsNotExist(err) { |
| return false, false, nil |
| } else { |
| return false, false, err |
| } |
| } |
| |
| type mockFS struct { |
| files map[string][]byte |
| } |
| |
| func (m mockFS) Open(name string) (io.ReadCloser, error) { |
| if f, ok := m.files[name]; ok { |
| return struct { |
| io.Closer |
| *bytes.Reader |
| }{ |
| ioutil.NopCloser(nil), |
| bytes.NewReader(f), |
| }, nil |
| } |
| |
| return nil, &os.PathError{ |
| Op: "open", |
| Path: name, |
| Err: os.ErrNotExist, |
| } |
| } |
| |
| func (m mockFS) Exists(name string) (bool, bool, error) { |
| _, ok := m.files[name] |
| return ok, false, nil |
| } |