1// Copyright 2020 Google Inc. All rights reserved. 2// 3// Licensed under the Apache License, Version 2.0 (the "License"); 4// you may not use this file except in compliance with the License. 5// You may obtain a copy of the License at 6// 7// http://www.apache.org/licenses/LICENSE-2.0 8// 9// Unless required by applicable law or agreed to in writing, software 10// distributed under the License is distributed on an "AS IS" BASIS, 11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12// See the License for the specific language governing permissions and 13// limitations under the License. 14 15package android 16 17import "github.com/google/blueprint" 18 19// Dependency tags can implement this interface and return true from InstallDepNeeded to annotate 20// that the installed files of the parent should depend on the installed files of the child. 21type InstallNeededDependencyTag interface { 22 // If InstallDepNeeded returns true then the installed files of the parent will depend on the 23 // installed files of the child. 24 InstallDepNeeded() bool 25} 26 27// Dependency tags can embed this struct to annotate that the installed files of the parent should 28// depend on the installed files of the child. 29type InstallAlwaysNeededDependencyTag struct{} 30 31func (i InstallAlwaysNeededDependencyTag) InstallDepNeeded() bool { 32 return true 33} 34 35var _ InstallNeededDependencyTag = InstallAlwaysNeededDependencyTag{} 36 37// IsInstallDepNeeded returns true if the dependency tag implements the InstallNeededDependencyTag 38// interface and the InstallDepNeeded returns true, meaning that the installed files of the parent 39// should depend on the installed files of the child. 40func IsInstallDepNeeded(tag blueprint.DependencyTag) bool { 41 if i, ok := tag.(InstallNeededDependencyTag); ok { 42 return i.InstallDepNeeded() 43 } 44 return false 45} 46