125 lines
4.7 KiB
Go
125 lines
4.7 KiB
Go
// Copyright (C) 2021 The Android Open Source Project
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package sdk
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import (
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"reflect"
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"android/soong/android"
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"github.com/google/blueprint/proptools"
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)
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// Contains information about the sdk properties that list sdk members by trait, e.g.
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// native_bridge.
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type sdkMemberTraitListProperty struct {
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// getter for the list of member names
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getter func(properties interface{}) []string
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// the trait of member referenced in the list
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memberTrait android.SdkMemberTrait
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}
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// Cache of dynamically generated dynamicSdkMemberTraits objects. The key is the pointer
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// to a slice of SdkMemberTrait instances returned by android.RegisteredSdkMemberTraits().
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var dynamicSdkMemberTraitsMap android.OncePer
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// A dynamically generated set of member list properties and associated structure type.
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//
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// Instances of this are created by createDynamicSdkMemberTraits.
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type dynamicSdkMemberTraits struct {
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// The dynamically generated structure type.
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//
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// Contains one []string exported field for each SdkMemberTrait returned by android.RegisteredSdkMemberTraits(). The name of
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// the field is the exported form of the value returned by SdkMemberTrait.SdkPropertyName().
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propertiesStructType reflect.Type
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// Information about each of the member trait specific list properties.
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memberTraitListProperties []*sdkMemberTraitListProperty
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}
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func (d *dynamicSdkMemberTraits) createMemberTraitListProperties() interface{} {
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return reflect.New(d.propertiesStructType).Interface()
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}
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func getDynamicSdkMemberTraits(key android.OnceKey, registeredTraits []android.SdkMemberTrait) *dynamicSdkMemberTraits {
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// Get the cached value, creating new instance if necessary.
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return dynamicSdkMemberTraitsMap.Once(key, func() interface{} {
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return createDynamicSdkMemberTraits(registeredTraits)
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}).(*dynamicSdkMemberTraits)
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}
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// Create the dynamicSdkMemberTraits from the list of registered member traits.
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//
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// A struct is created which contains one exported field per member trait corresponding to
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// the SdkMemberTrait.SdkPropertyName() value.
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//
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// A list of sdkMemberTraitListProperty instances is created, one per member trait that provides:
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// * a reference to the member trait.
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// * a getter for the corresponding field in the properties struct.
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func createDynamicSdkMemberTraits(sdkMemberTraits []android.SdkMemberTrait) *dynamicSdkMemberTraits {
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var listProperties []*sdkMemberTraitListProperty
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memberTraitToProperty := map[android.SdkMemberTrait]*sdkMemberTraitListProperty{}
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var fields []reflect.StructField
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// Iterate over the member traits creating StructField and sdkMemberTraitListProperty objects.
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nextFieldIndex := 0
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for _, memberTrait := range sdkMemberTraits {
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p := memberTrait.SdkPropertyName()
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var getter func(properties interface{}) []string
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// Create a dynamic exported field for the member trait's property.
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fields = append(fields, reflect.StructField{
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Name: proptools.FieldNameForProperty(p),
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Type: reflect.TypeOf([]string{}),
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})
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// Copy the field index for use in the getter func as using the loop variable directly will
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// cause all funcs to use the last value.
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fieldIndex := nextFieldIndex
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nextFieldIndex += 1
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getter = func(properties interface{}) []string {
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// The properties is expected to be of the following form (where
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// <Module_traits> is the name of an SdkMemberTrait.SdkPropertyName().
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// properties *struct {<Module_traits> []string, ....}
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//
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// Although it accesses the field by index the following reflection code is equivalent to:
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// *properties.<Module_traits>
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//
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list := reflect.ValueOf(properties).Elem().Field(fieldIndex).Interface().([]string)
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return list
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}
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// Create an sdkMemberTraitListProperty for the member trait.
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memberListProperty := &sdkMemberTraitListProperty{
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getter: getter,
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memberTrait: memberTrait,
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}
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memberTraitToProperty[memberTrait] = memberListProperty
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listProperties = append(listProperties, memberListProperty)
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}
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// Create a dynamic struct from the collated fields.
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propertiesStructType := reflect.StructOf(fields)
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return &dynamicSdkMemberTraits{
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memberTraitListProperties: listProperties,
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propertiesStructType: propertiesStructType,
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}
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}
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