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1// Copyright (C) 2021 The Android Open Source Project
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 java
16
17import (
18	"android/soong/android"
19	"github.com/google/blueprint"
20)
21
22// MonolithicHiddenAPIInfo contains information needed/provided by the hidden API generation of the
23// monolithic hidden API files.
24//
25// Each list of paths includes all the equivalent paths from each of the bootclasspath_fragment
26// modules that contribute to the platform-bootclasspath.
27type MonolithicHiddenAPIInfo struct {
28	// FlagsFilesByCategory maps from the flag file category to the paths containing information for
29	// that category.
30	FlagsFilesByCategory FlagFilesByCategory
31
32	// The paths to the generated stub-flags.csv files.
33	StubFlagsPaths android.Paths
34
35	// The paths to the generated annotation-flags.csv files.
36	AnnotationFlagsPaths android.Paths
37
38	// The paths to the generated metadata.csv files.
39	MetadataPaths android.Paths
40
41	// The paths to the generated index.csv files.
42	IndexPaths android.Paths
43
44	// The paths to the generated all-flags.csv files.
45	AllFlagsPaths android.Paths
46
47	// The classes jars from the libraries on the platform bootclasspath.
48	ClassesJars android.Paths
49}
50
51// newMonolithicHiddenAPIInfo creates a new MonolithicHiddenAPIInfo from the flagFilesByCategory
52// plus information provided by each of the fragments.
53func newMonolithicHiddenAPIInfo(ctx android.ModuleContext, flagFilesByCategory FlagFilesByCategory, classpathElements ClasspathElements) MonolithicHiddenAPIInfo {
54	monolithicInfo := MonolithicHiddenAPIInfo{}
55
56	monolithicInfo.FlagsFilesByCategory = flagFilesByCategory
57
58	// Merge all the information from the classpathElements. The fragments form a DAG so it is possible that
59	// this will introduce duplicates so they will be resolved after processing all the classpathElements.
60	for _, element := range classpathElements {
61		var classesJars android.Paths
62		switch e := element.(type) {
63		case *ClasspathLibraryElement:
64			classesJars = retrieveClassesJarsFromModule(e.Module())
65
66		case *ClasspathFragmentElement:
67			fragment := e.Module()
68			if ctx.OtherModuleHasProvider(fragment, HiddenAPIInfoProvider) {
69				info := ctx.OtherModuleProvider(fragment, HiddenAPIInfoProvider).(HiddenAPIInfo)
70				monolithicInfo.append(&info)
71
72				// If the bootclasspath fragment actually perform hidden API processing itself then use the
73				// CSV files it provides and do not bother processing the classesJars files. This ensures
74				// consistent behavior between source and prebuilt as prebuilt modules do not provide
75				// classesJars.
76				if info.AllFlagsPath != nil {
77					continue
78				}
79			}
80
81			classesJars = extractClassesJarsFromModules(e.Contents)
82		}
83
84		monolithicInfo.ClassesJars = append(monolithicInfo.ClassesJars, classesJars...)
85	}
86
87	// Dedup paths.
88	monolithicInfo.dedup()
89
90	return monolithicInfo
91}
92
93// append appends all the files from the supplied info to the corresponding files in this struct.
94func (i *MonolithicHiddenAPIInfo) append(other *HiddenAPIInfo) {
95	i.FlagsFilesByCategory.append(other.FlagFilesByCategory)
96
97	// The output may not be set if the bootclasspath_fragment has not yet been updated to support
98	// hidden API processing.
99	// TODO(b/179354495): Switch back to append once all bootclasspath_fragment modules have been
100	//  updated to support hidden API processing properly.
101	appendIfNotNil := func(paths android.Paths, path android.Path) android.Paths {
102		if path == nil {
103			return paths
104		}
105		return append(paths, path)
106	}
107	i.StubFlagsPaths = appendIfNotNil(i.StubFlagsPaths, other.StubFlagsPath)
108	i.AnnotationFlagsPaths = appendIfNotNil(i.AnnotationFlagsPaths, other.AnnotationFlagsPath)
109	i.MetadataPaths = appendIfNotNil(i.MetadataPaths, other.MetadataPath)
110	i.IndexPaths = appendIfNotNil(i.IndexPaths, other.IndexPath)
111	i.AllFlagsPaths = appendIfNotNil(i.AllFlagsPaths, other.AllFlagsPath)
112}
113
114// dedup removes duplicates in all the paths, while maintaining the order in which they were
115// appended.
116func (i *MonolithicHiddenAPIInfo) dedup() {
117	i.FlagsFilesByCategory.dedup()
118	i.StubFlagsPaths = android.FirstUniquePaths(i.StubFlagsPaths)
119	i.AnnotationFlagsPaths = android.FirstUniquePaths(i.AnnotationFlagsPaths)
120	i.MetadataPaths = android.FirstUniquePaths(i.MetadataPaths)
121	i.IndexPaths = android.FirstUniquePaths(i.IndexPaths)
122	i.AllFlagsPaths = android.FirstUniquePaths(i.AllFlagsPaths)
123}
124
125var MonolithicHiddenAPIInfoProvider = blueprint.NewProvider(MonolithicHiddenAPIInfo{})
126