/
delegate.go
37 lines (32 loc) · 1.24 KB
/
delegate.go
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// Copyright (C) 2017 Google Inc.
//
// 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 stub
import "github.com/google/gapid/core/os/shell"
// Delegate is an implementation of Target that passes all command requests to a the first child that accepts
// them.
// A child target refuses a command by returning nil,nil from it's Start method.
type Delegate struct {
// Handlers holds the set of possible command handlers.
Handlers []shell.Target
}
func (t *Delegate) Start(cmd shell.Cmd) (shell.Process, error) {
for _, handler := range t.Handlers {
p, err := handler.Start(cmd)
if _, unhandled := err.(UnhandledCmdError); !unhandled {
return p, err
}
}
return nil, UnhandledCmdError(cmd)
}
func (Delegate) String() string { return "stub" }