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- // Copyright (C) 2021 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 sdk
- import (
- "reflect"
- "android/soong/android"
- "github.com/google/blueprint/proptools"
- )
- // Contains information about the sdk properties that list sdk members by type, e.g.
- // Java_header_libs.
- type sdkMemberTypeListProperty struct {
- // getter for the list of member names
- getter func(properties interface{}) []string
- // setter for the list of member names
- setter func(properties interface{}, list []string)
- // the type of member referenced in the list
- memberType android.SdkMemberType
- // the dependency tag used for items in this list that can be used to determine the memberType
- // for a resolved dependency.
- dependencyTag android.SdkMemberDependencyTag
- }
- func (p *sdkMemberTypeListProperty) propertyName() string {
- return p.memberType.SdkPropertyName()
- }
- // Cache of dynamically generated dynamicSdkMemberTypes objects. The key is the pointer
- // to a slice of SdkMemberType instances held in android.SdkMemberTypes.
- var dynamicSdkMemberTypesMap android.OncePer
- // A dynamically generated set of member list properties and associated structure type.
- type dynamicSdkMemberTypes struct {
- // The dynamically generated structure type.
- //
- // Contains one []string exported field for each android.SdkMemberTypes. The name of the field
- // is the exported form of the value returned by SdkMemberType.SdkPropertyName().
- propertiesStructType reflect.Type
- // Information about each of the member type specific list properties.
- memberTypeListProperties []*sdkMemberTypeListProperty
- memberTypeToProperty map[android.SdkMemberType]*sdkMemberTypeListProperty
- }
- func (d *dynamicSdkMemberTypes) createMemberTypeListProperties() interface{} {
- return reflect.New(d.propertiesStructType).Interface()
- }
- func getDynamicSdkMemberTypes(key android.OnceKey, registeredTypes []android.SdkMemberType) *dynamicSdkMemberTypes {
- // Get the cached value, creating new instance if necessary.
- return dynamicSdkMemberTypesMap.Once(key, func() interface{} {
- return createDynamicSdkMemberTypes(registeredTypes)
- }).(*dynamicSdkMemberTypes)
- }
- // Create the dynamicSdkMemberTypes from the list of registered member types.
- //
- // A struct is created which contains one exported field per member type corresponding to
- // the SdkMemberType.SdkPropertyName() value.
- //
- // A list of sdkMemberTypeListProperty instances is created, one per member type that provides:
- // * a reference to the member type.
- // * a getter for the corresponding field in the properties struct.
- // * a dependency tag that identifies the member type of a resolved dependency.
- func createDynamicSdkMemberTypes(sdkMemberTypes []android.SdkMemberType) *dynamicSdkMemberTypes {
- var listProperties []*sdkMemberTypeListProperty
- memberTypeToProperty := map[android.SdkMemberType]*sdkMemberTypeListProperty{}
- var fields []reflect.StructField
- // Iterate over the member types creating StructField and sdkMemberTypeListProperty objects.
- nextFieldIndex := 0
- for _, memberType := range sdkMemberTypes {
- p := memberType.SdkPropertyName()
- var getter func(properties interface{}) []string
- var setter func(properties interface{}, list []string)
- if memberType.RequiresBpProperty() {
- // Create a dynamic exported field for the member type's property.
- fields = append(fields, reflect.StructField{
- Name: proptools.FieldNameForProperty(p),
- Type: reflect.TypeOf([]string{}),
- Tag: `android:"arch_variant"`,
- })
- // Copy the field index for use in the getter func as using the loop variable directly will
- // cause all funcs to use the last value.
- fieldIndex := nextFieldIndex
- nextFieldIndex += 1
- getter = func(properties interface{}) []string {
- // The properties is expected to be of the following form (where
- // <Module_types> is the name of an SdkMemberType.SdkPropertyName().
- // properties *struct {<Module_types> []string, ....}
- //
- // Although it accesses the field by index the following reflection code is equivalent to:
- // *properties.<Module_types>
- //
- list := reflect.ValueOf(properties).Elem().Field(fieldIndex).Interface().([]string)
- return list
- }
- setter = func(properties interface{}, list []string) {
- // The properties is expected to be of the following form (where
- // <Module_types> is the name of an SdkMemberType.SdkPropertyName().
- // properties *struct {<Module_types> []string, ....}
- //
- // Although it accesses the field by index the following reflection code is equivalent to:
- // *properties.<Module_types> = list
- //
- reflect.ValueOf(properties).Elem().Field(fieldIndex).Set(reflect.ValueOf(list))
- }
- }
- // Create an sdkMemberTypeListProperty for the member type.
- memberListProperty := &sdkMemberTypeListProperty{
- getter: getter,
- setter: setter,
- memberType: memberType,
- // Dependencies added directly from member properties are always exported.
- dependencyTag: android.DependencyTagForSdkMemberType(memberType, true),
- }
- memberTypeToProperty[memberType] = memberListProperty
- listProperties = append(listProperties, memberListProperty)
- }
- // Create a dynamic struct from the collated fields.
- propertiesStructType := reflect.StructOf(fields)
- return &dynamicSdkMemberTypes{
- memberTypeListProperties: listProperties,
- memberTypeToProperty: memberTypeToProperty,
- propertiesStructType: propertiesStructType,
- }
- }
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